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Why Low ESR Polymer Capacitors Matter in Modern Power Circuits

22 Jan 2026

Kingtronics International Company · Inspired by Innovation

Why Low ESR Polymer Capacitors Matter in Modern Power Circuits

In modern power design, low ESR polymer capacitors are no longer a niche choice. They are widely used in switching power supplies, DC-DC converters, and high-speed load environments where ripple voltage, transient response, and thermal stability directly impact system reliability.

For teams evaluating a Kemet A700 alternative or a Panasonic EEF-SX replacement, polymer aluminum capacitors are often shortlisted because they provide stable low ESR and strong ripple handling for power rails. If your application runs long hours or faces frequent load steps, polymer series selection should be treated as a power integrity decision, not a last-minute substitution.

Video overview: polymer capacitors for low ESR power stability, ripple reduction, and reliability

What ESR Impacts in Real Power Circuits

Equivalent Series Resistance affects how a capacitor behaves under real operating conditions. In power stages, higher ESR increases ripple and heat, and can reduce lifetime when ripple current is significant. This is why engineers often search for terms like low ESR polymer capacitor, high ripple polymer capacitor, and long life polymer capacitor.

  • Lower output ripple voltage in switching power supplies and DC-DC converter outputs
  • Faster transient response during load steps (CPU, MCU, FPGA rails and VRM outputs)
  • Reduced self-heating risk, supporting stability over long operating hours

In procurement terms, polymer capacitors help reduce risk when your design prioritizes predictable performance. In engineering terms, polymer capacitors are frequently selected to improve power rail stability and reduce margin pressure in validation.

Typical Applications Where Polymer Capacitors Are Specified

Low ESR polymer capacitors are commonly used in applications that combine continuous operation and dynamic load behavior, including:

  • Alarm and security systems power rails and control boards
  • Industrial power supplies and embedded control boards
  • Power filtering stages for communication and automation equipment
  • High-density PCB designs where SMD polymer capacitors support compact layouts

In many of these designs, the selection intent is consistent: low ESR, stable reliability, and a series that matches the endurance and temperature class needed.

Quick Comparison: Kingtronics GKT Polymer Series

Click the product image to view the official product page and specifications. For selection work, start from your packaging (SMD vs radial) and then align endurance and temperature targets.

Series Product Best Fit Typical Use
GKT-AH Polymer Capacitor Kingtronics GKT-AH polymer capacitor SMD miniaturized Miniaturized SMD polymer capacitor for high-density PCB layouts and compact boards. Dense power rails, compact power modules, space-constrained DC-DC designs.
GKT-AS Polymer Capacitor Kingtronics GKT-AS polymer capacitor radial low ESR Baseline radial low ESR polymer capacitor for general power supply designs. Output filtering, decoupling, and stable rails in mainstream power circuits.
GKT-AK Polymer Capacitor Kingtronics GKT-AK polymer capacitor radial long life Long life polymer capacitor option for continuous operation and reliability targets. Industrial systems, always-on equipment, and long-running power supplies.
GKT-MR Conductive Polymer Hybrid Capacitor Kingtronics GKT-MR conductive polymer hybrid capacitor Hybrid polymer capacitor positioned for higher temperature reliability requirements. Reliability-focused power sections and elevated temperature targets.

Confirm Specs on the Official Product Pages

For accurate selection, always confirm the series details on the official website. This includes endurance class, temperature rating, and packaging options needed for your power design validation. If you need selection support or want to align a Kemet A700 alternative or Panasonic EEF-SX replacement, use the contact form to share your target constraints.

Looking for Kemet A700 or Panasonic EEF-SX Alternatives for Alarm Systems?

12 Jan 2026

Kingtronics International Company — Inspired by Innovation

When designing power stages for alarm and security equipment, engineers often look for a reliable Kemet A700 alternative or Panasonic EEF-SX replacement to improve ripple handling and long-term stability. In many cases, choosing the right polymer capacitor alarm system solution can directly impact system reliability and lifetime performance.

To better understand how conductive polymer capacitors work in real applications, you can first watch this short overview video:

Video overview: Conductive polymer solid capacitors used in Alarm & Security system power design

Why Solid Polymer Capacitors Are Used in Alarm Systems

Alarm and security systems typically operate 24/7 and experience frequent load fluctuations. Conventional electrolytic capacitors may suffer from higher ESR, heat generation, and limited lifetime under these conditions.

A solid polymer capacitor offers clear advantages for alarm system power design, including lower ESR, improved ripple current capability, and more stable electrical characteristics across temperature ranges. These features make polymer capacitors a practical choice for engineers seeking stable and predictable performance.

Practical Alternatives to Kemet A700 and Panasonic EEF-SX

For designers searching for a dependable Kemet A700 alternative or Panasonic EEF-SX replacement, the following polymer solid capacitor series are commonly evaluated in alarm and security applications:

The GKT-EA Polymer Solid Capacitor is designed for low-profile layouts where board height is limited and low ESR is critical.
The GKT-EB Polymer Solid Capacitor provides a wider voltage and capacitance range, along with higher ripple current capability for power-intensive sections.

Quick Comparison: GKT-EA vs. GKT-EB

Use the table below to quickly match your design priorities. Click a product image to view the product page.

Series Product Best Fit Typical Use in Alarm Systems
GKT-EA Polymer Solid Capacitor Kingtronics GKT-EA polymer solid capacitor product image Low-profile layout needs low ESR stability (height-constrained boards). System boards and control boards requiring stable decoupling and predictable filtering performance.
GKT-EB Polymer Solid Capacitor Kingtronics GKT-EB polymer solid capacitor product image Wider voltage/capacitance selection and strong ripple-current capability for power sections. Power filtering stages and modules facing ripple and thermal stress in continuous operation.

Typical Alarm & Security Applications

  • Alarm control panels and system boards
  • Security system power filtering stages
  • Embedded alarm modules requiring stable decoupling
  • Power sections with high ripple or thermal stress

In these scenarios, solid polymer capacitors help improve power integrity while reducing long-term maintenance risk.

Summary

If you are evaluating a Panasonic EEF-SX replacement or Kemet A700 alternative for alarm and security system designs, polymer solid capacitors provide a stable and reliable solution. By combining low ESR, strong ripple performance, and proven endurance, the GKT-EA and GKT-EB series support consistent operation in demanding alarm system environments.

Kingtronics GKT polymer solid capacitors overview banner for alarm and security system applications

Behind the Scenes at Kingtronics: How People and Culture Shape Long-Term Reliability

31 Dec 2025

Kingtronics International Company — Inspired by Innovation

More Than Components – Kingtronics 2025 ESG and team journey

In the electronics industry, reliability is often discussed in terms of specifications, certifications, and supply chain performance. But behind every stable delivery schedule and consistent product quality, there is a less visible foundation: people.

At Kingtronics, long-term reliability does not begin on the production line. It begins with how teams communicate, collaborate, and support one another in everyday work.

Everyday Collaboration Beyond the Office

While technical expertise is essential, smooth collaboration across departments plays an equally important role. Regular internal gatherings and team activities give engineers, logistics specialists, quality teams, and sales colleagues the opportunity to exchange perspectives beyond formal meetings.

These moments help break down silos and create shared understanding, which ultimately translates into faster coordination, clearer communication, and fewer disruptions for customers.

Kingtronics team gathering and internal culture supporting cross-functional collaboration

Small Actions, Meaningful Impact

Corporate responsibility is often associated with large initiatives and formal policies. At Kingtronics, it also takes shape through simple, human actions.

Participation in community initiatives, such as blood donation activities, reflects a mindset of shared responsibility. These activities remind teams that the work they do every day is connected to a broader social environment.

Kingtronics 2025 blood donation activity demonstrating social responsibility

A Workplace Built on Trust and Continuity

Celebrating milestones together, whether seasonal events or team achievements, contributes to a sense of continuity and trust within the organization. This stability matters.

For customers and partners, it means working with teams that stay consistent over time, understand long-term requirements, and approach collaboration with responsibility rather than short-term thinking.

Kingtronics team activity reflecting shared values, trust, and continuity

Why This Matters for Our Partners

Behind-the-scenes culture may not appear on datasheets or certificates, but its impact is tangible. A team that communicates openly and feels accountable to one another is better equipped to handle challenges, adapt to changes, and maintain reliable operations.

At Kingtronics, we believe that reliability is not only engineered. It is cultivated, day by day, through people, culture, and shared values.

Kingtronics ESG care and people-first culture supporting operational stability

Looking Ahead

As the electronics industry continues to evolve, technical excellence will always be essential. But sustainable partnerships are built on more than components alone.

They are built on people.

To learn more about Kingtronics’ long-term commitments and responsible practices, please visit our official ESG overview page .

Connect with Kingtronics

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Film Capacitors with Axial Leads Kingtronics FKT-AA~FKT-AD: A Quick Engineer-Friendly Introduction

10 Dec 2025

Axial Capacitors Overview – Kingtronics FKT-AA~FKT-AD Series

Kingtronics FKT-AA~FKT-AD axial film capacitors overview

Kingtronics International Company — Inspired by Innovation

1. Axial Film Capacitor Overview

Axial Film Capacitors remain a preferred solution for engineers who require stable performance, long operating life, and dependable characteristics across consumer, industrial, and power-related applications. Kingtronics FKT-AA, FKT-AB, FKT-AC, and FKT-AD series represent a complete axial lead film capacitor lineup optimized for filtering, coupling, pulse circuits, and precision signal conditioning. Built with high-grade dielectric materials and metallized film design, these capacitors offer excellent electrical stability and robust mechanical endurance for both modern and legacy circuit architectures.

2. Technical Q&A: Engineer-Focused Selection Guide (Voltage / Capacitance / ESR)

Q1: How do I select the appropriate voltage rating?

Select a voltage rating that accounts for steady-state voltage, surge tolerance, and AC ripple. Polypropylene (PP): higher dielectric strength → ideal for pulse and switching circuits. Polyester (PET): cost-efficient for coupling, timing, and general filtering.

Q2: What should I consider when selecting capacitance?

Evaluate tolerance, temperature drift, and frequency behavior. Axial film capacitors maintain consistent capacitance thanks to uniform dielectric layering — ideal for audio crossovers, signal conditioning, and precision analog designs.

3. Comparison Table: Axial Film vs Metallized Polyester vs Polypropylene

Feature / Property Axial Film Capacitors Metallized Polyester (PET) Metallized Polypropylene (PP)
Dielectric Loss Low Medium Very Low
Temperature Stability Good Moderate Excellent
Pulse Handling Good Limited Very Strong
Typical Applications Filtering, coupling, signal control Consumer electronics, DC blocking High voltage, snubber, precision circuits
Cost Moderate Low Moderate–High

This comparison highlights why polypropylene axial capacitors are preferred for high-voltage, high-stress circuits, while polyester types provide economical benefits for consumer-grade electronics.

Explore Kingtronics Axial Film Capacitors

Looking for stable, low-loss axial film capacitors for power supplies, lighting, industrial control or signal circuits? Browse our FKT-AA ~ FKT-AD series below or contact our engineering/sales team for detailed specs & quotations.

View FKT-AA Series View FKT-AB Series View FKT-AC Series View FKT-AD Series Contact Kingtronics Team

4. Engineer-Oriented Takeaway | Application Highlights of FKT-AA~FKT-AD Series

The Kingtronics FKT-AA~FKT-AD Axial Film Capacitor series delivers a balanced combination of low ESR, stable capacitance, strong pulse endurance, and mechanical durability. The axial lead structure ensures predictable impedance characteristics, supporting both modern compact designs and long-life industrial systems. For engineers requiring reliability under thermal cycling, vibration, and dynamic load stress, the FKT axial series provides an excellent solution.

Use this video together with the portfolio overview above to map theoretical concepts directly to Kingtronics FKT-AA~FKT-AD Axial Film Capacitor series part numbers from Kingtronics.

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Power Management & Filtering

Ideal for AC/DC filters, input EMI suppression, smoothing circuits, telecom power modules, and compact PSU designs.

Pulse, Snubber & High dV/dt Circuits

FKT-AC and FKT-AD offer strong pulse endurance, self-healing behavior, and high dV/dt capability — ideal for snubber networks, motor drives, ignition circuits, and industrial switching systems.

Lighting Ballasts & LED Drivers

Excellent compensation, thermal stability, and long service life reduce flicker and drift in CFL and LED power stages.

Audio & Signal Conditioning

Low dielectric absorption ensures clean signal transmission with minimal distortion, ideal for crossover networks and precision analog circuitry.

Industrial & Automotive Electronics

Resin-sealed axial structure withstands vibration, making the series suitable for HVAC controllers, automation modules, ignition timing and rugged industrial equipment.

5. Engineer Takeaway

Kingtronics FKT-AA~FKT-AD Axial Film Capacitors suit diverse circuit environments where stability, long service life, and mechanical robustness are essential. Their metallized film construction with axial lead geometry delivers predictable electrical behavior across both low- and high-frequency sections.

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Why TVS Diodes Matter in Power Supplies and Industrial Electronics

1 Dec 2025

Kingtronics International Company — Inspired by Innovation

TVS diode surge protection diagram, TVS diode application blocks, SMAJ SMBJ SMCJ package comparison, clamping voltage chart

When power systems and industrial equipment face sudden voltage spikes, the entire circuit can be put at risk. That’s why TVS (Transient Voltage Suppressor) diodes play such a critical role — they clamp dangerous surges within nanoseconds, protecting sensitive ICs, MOSFETs and controllers.

This article is written for design and maintenance engineers who work with power supplies, industrial equipment, automation and high-reliability systems. It explains why TVS diodes have become a standard protection element and how Kingtronics TVS series can help you build stable, cost-effective designs.

Why TVS Diodes Are Essential in Power Supplies

Power supply stages sit at the front line of the system. They see switching noise from converters, disturbances from the AC line and, in some regions, lightning-related surges. Without proper surge protection, these events can damage rectifiers, controllers or downstream loads.

A correctly selected TVS diode clamps the surge to a defined level, absorbs the pulse energy and allows the supply to recover, instead of letting the transient propagate into the rest of the circuit.

Common Use Cases in Power Electronics

Based on industry applications and Kingtronics internal data, TVS diodes are commonly used in power-related designs such as:

• AC/DC converters and power adapters
• General switching power supplies for industrial and IT equipment
• High-power SMPS in servers, automation and charging systems
• SMPS output regulation lines (3.3V / 5V / 12V) for logic and control rails
• Lightning suppression boards and surge protection modules
• Dedicated transient suppression circuits at supply input or critical nodes

Recommended Kingtronics TVS Series for Power Designs

• SMBJ Series – Compact SMD protection for SMPS output and converter boards where PCB area is limited
• SMCJ Series – Higher surge capability SMC package for high-power PSUs and industrial converters
• P6KE Series – Versatile axial solution for switching power supply and general transient protection
• 1.5KE Series – High-surge axial TVS for heavy-duty SMPS and robust industrial power units
• 5KP Series – Designed for lightning and high-energy suppression in harsh line and surge environments

For full technical data and the complete list of available TVS ratings, browse the Kingtronics TVS diode selection page and explore detailed surge protection options.

Explore Kingtronics TVS Diode Series →

To request quotations, cross-reference support or discuss design-in requirements with our engineers:

Contact Kingtronics Engineering / Sales →

Industrial Electronics: Harsh Environments Need Robust Protection

Industrial and transportation electronics often operate in electrically harsh environments. Motors, long cable runs, inductive loads and external interfaces can all inject noise and surges into control and monitoring circuitry.

According to Kingtronics application data, TVS diodes are widely used to protect critical industrial and safety-related systems, including:

• Aircraft engine controllers and onboard electronics
• Elevator control systems and building automation panels
• Fire alarm systems and emergency signaling devices
• Gas detectors and safety monitoring equipment
• Industrial control boards for machinery and process control
• Voltage regulator modules and power distribution boards
• Power MOSFET protection in switching and motor control stages
• Black box recorders and data logging systems
• Image inspection and vision systems in production lines

In these high-reliability scenarios, both surge energy and response time matter. Kingtronics offers options across SMAJ / SMBJ / SMCJ / 1.5KE / P6KE / P4KE / SA Series, so designers can choose the package, power rating and voltage range that match their environment and qualification level.

Featured Series & Datasheets

When you move from concept to implementation, it helps to compare package, surge rating and use cases at a glance. The table below summarizes key Kingtronics TVS families and links directly to product pages or datasheets for further design work.

Series Package Peak Pulse Power Typical Applications Product / Datasheet
SMAJ SMA 400 W Compact SMPS, telecom, adapter boards View SMAJ product page
SMBJ SMB 600 W SMPS output lines, industrial control Explore SMBJ product page
SMCJ SMC 1500 W High-power PSU, automation systems Discover SMCJ product page
P4KE Axial 400 W General purpose transient suppression Download P4KE datasheet
P6KE Axial 600 W Switching PSU protection, industrial boards Download P6KE datasheet
1.5KE Axial 1500 W Heavy-duty SMPS, industrial PSU Download 1.5KE datasheet
SA5.0A Axial 500 W Low-voltage lines, signal protection Download SA5.0A datasheet

For cross-reference or engineering support, or if you are qualifying multiple protection levels across different lines, our team can help you match the proper TVS series to your operating environment and surge profile.

Extended Learning: Video Breakdown

For engineers who prefer visual explanations, the following reference video gives a clear overview of TVS operation and surge behavior:
TVS Diode Basics & Surge Protection Explained

This video pairs well with this article — readers can quickly connect theory, waveforms and real-world protection circuits.

Conclusion

Power supplies and industrial equipment require reliable surge protection. TVS diodes remain one of the simplest and most effective ways to improve system robustness and extend field lifetime.

With a full range covering SMAJ to 5KP high-energy series, Kingtronics provides robust and cost-optimized TVS solutions for OEMs, EMS and industrial manufacturers. Whether you are designing a new platform or updating an existing board, selecting the right TVS diode can significantly reduce field failures and service costs.

If you need help selecting the right TVS diode for your design, our team is ready to assist.

Reliable Film Capacitor Solution for Snubber and Pulse Applications – FKT-SA Series

20 Nov 2025

Kingtronics International Company — Inspired by Innovation

Kingtronics FKT-SA double-sided metallized polypropylene axial film capacitor for high voltage pulse and snubber circuits in accordance with IEC 61071

Reliable Film Capacitor Solution for Snubber and Pulse Applications
Kingtronics FKT-SA double-sided metallized polypropylene film capacitors for pulse and high voltage designs

When designing high-voltage or high-frequency systems, engineers frequently confront one major challenge: finding a capacitor that delivers predictable performance under demanding pulse and snubber conditions. Many film capacitors look sufficient on paper—but when exposed to fast discharge events, elevated temperatures, and repeated cycles, issues such as rising dissipation, capacitance shift, or insulation degradation can appear in real operation.

The Kingtronics FKT-SA Series is specified as a double-sided metallized polypropylene film capacitor with a non-inductive configuration. According to the datasheet, it offers low loss and small inherent temperature rise, a negative temperature coefficient of capacitance, and an epoxy resin dip-sealed construction for flame-resistant circuits. It is referenced to IEC 61071 and designed for high voltage, high frequency and pulse applications, lamp capacitors for electronic ballast compact lamps, and snubber / SCR commutation circuits.

View FKT-SA Product Page →

Key Technical Characteristics
Datasheet-based parameters for engineering selection

  • Double sided metallized polypropylene structure with non-inductive configuration.
  • Low loss and small inherent temperature rise; negative temperature coefficient of capacitance.
  • Reference Standard: IEC 61071.
  • Climatic Category: 40 / 105 / 56.
  • Operating temperature range: −40 °C to +105 °C.
  • Rated temperature range:
    • up to +85 °C for rated DC voltage (VR(DC))
    • up to +75 °C for rated AC voltage (VR(AC))
  • Derating above these points: from +85 °C to +105 °C for DC, and from +75 °C to +105 °C for AC, with a decreasing factor of 1.25% per °C for VR.
  • Rated voltages: 250 V, 400 V, 630 V, 1000 V, 1600 V, 2000 V.
  • Capacitance range: 0.00022 µF to 3.9 µF.
  • Capacitance tolerance options: ±2%, ±3%, ±5%, ±10%, ±20%.
  • Voltage proof: 1.60 UR (5 s).
  • Dissipation factor: ≤ 0.0010 @ 1 kHz, 20 °C.
  • Insulation resistance at 20 °C, 100 V, 1 min:
    • CR ≤ 0.33 µF: ≥ 50 000 MΩ
    • CR > 0.33 µF: ≥ 15 000 s

Typical Applications
High voltage, high frequency and pulse circuits, snubber and lamp capacitor use

The FKT-SA Series is listed for the following application areas in the datasheet:

  • High voltage, high frequency and pulse circuits.
  • Lamp capacitor for electronic ballast compact lamps.
  • SNUBBER and SCR commutation circuits.

Temperature and Frequency Characteristics
Capacitance, dissipation, operating voltage and insulation behaviour

The FKT-SA datasheet includes charts that show how capacitance, dissipation factor, operating voltage and insulation resistance behave over temperature, as well as capacitance and dissipation vs. frequency. These curves give engineers a reference for estimating capacitor behaviour in high voltage, high frequency and pulse circuits when actual operating conditions differ from nominal test points.

FKT-SA Pulse and Snubber Application Video
Overview of Kingtronics FKT-SA film capacitor series

The following video introduces the Kingtronics FKT-SA film capacitor series and highlights how this double-sided metallized polypropylene construction can be used in pulse and snubber applications.

FKT Series Catalog for Sourcing and Design
Family overview and detailed electrical ratings

Kingtronics FKT Series Film Capacitor Catalog (PDF)

The FKT Series catalog provides an overview of Kingtronics film capacitor types in this family, including ratings, dimensions and ordering information for FKT-SA and related series.

Open FKT Series Catalog (PDF)

The catalog helps engineering and sourcing teams compare available voltage ratings, capacitance ranges and mechanical formats within the FKT family.

Procurement Considerations for Engineers & Buyers
Matching rated values, derating curves and application requirements

When specifying film capacitors for pulse and snubber applications, engineers and procurement teams typically review:

  • Rated voltage and capacitance ranges appropriate for the target circuit.
  • Operating temperature range and the stated derating factors vs. temperature.
  • Dissipation factor and insulation resistance under specified test conditions.
  • Climatic category and reference standard (IEC 61071 for FKT-SA).

Because these parameters are clearly listed in the FKT-SA datasheet, the series can be evaluated and compared against the electrical and environmental requirements of high voltage, high frequency and pulse systems.

For full technical data and the complete list of available ratings, please refer to the FKT-SA product page and catalog.

Explore FKT-SA Specifications →

To request quotations or discuss engineering requirements:

Contact Engineering / Sales →

Final Notes

For applications involving high-voltage pulses, snubber networks or high-frequency switching, the Kingtronics FKT-SA Series provides a double-sided metallized polypropylene film capacitor option with clearly defined ratings and characteristics for engineering evaluation.

How XKT MOVs Safeguard Power Designs Against Transient Surges

10 Nov 2025

 

Kingtronics International Company — Inspired by Innovation

The Kingtronics® XKT Metal Oxide Varistor (MOV) Series is a surge protection component designed for power supply protection, LED driver protection, and industrial power reliability. When designing power circuits or LED drivers, engineers face one key challenge: preventing sudden transient voltage spikes from damaging sensitive components. The Kingtronics XKT Series provides fast, repeatable surge suppression that helps maintain long-term system stability.

Close-up of Kingtronics XKT Metal Oxide Varistor (MOV) disc package used for surge suppression in AC/DC power supplies and LED drivers

Reliable Surge Protection Across 18V–1800V
Kingtronics XKT Metal Oxide Varistor surge protection for power and LED driver designs

The XKT MOV Series is engineered for industrial-grade surge protection, covering a wide operating voltage range from 18 V up to 1800 V. With fast clamping response and high energy absorption capability, the device helps protect AC/DC power supplies, LED lighting modules, industrial controllers, and consumer electronics from transient surges or lightning-induced spikes.

Key advantages of Kingtronics XKT Series:

  • Wide operating voltage range supports multiple circuit designs and ratings
  • High surge capability (series options up to 20 A peak rating, per datasheet test conditions)
  • Designed to absorb high-energy transients (up to hundreds of joules depending on series size)
  • Full compliance with RoHS and REACH environmental requirements
  • Protection for industrial control modules, telecom DC rails, and power converters
Compared with well-known brands such as EPCOS (TDK), the Kingtronics XKT Series targets equivalent functional performance while offering a more competitive cost position for sourcing and design-in.

How a Metal Oxide Varistor (MOV) Protects Your Power Circuit
Transient surge suppression and voltage clamping behavior

A Metal Oxide Varistor (MOV) is a voltage-dependent resistor. Under normal operating voltage, the MOV remains in a high-impedance state and does not significantly affect the circuit. During a surge event, the MOV switches to a low-impedance path and clamps the excessive voltage, diverting surge current away from the sensitive load. This fast response helps prevent damage to downstream ICs, drivers, or control modules.

In typical usage, the Kingtronics XKT MOV is placed across the input line of a power circuit. When a spike appears on the line, the varistor reacts within microseconds to suppress dangerous peaks and stabilize the line voltage.

Kingtronics XKT Series MOV components for surge protection and transient voltage suppression across 18V–1800V applications

Image alt text: Kingtronics XKT Metal Oxide Varistor (MOV) showing disc package, used as a transient surge suppression component for AC and DC power lines.

Typical Application Areas for the XKT MOV Series
Power supply protection / LED driver surge protection / industrial electronics

  • Power supply surge suppression and AC line transient protection
  • LED lighting and LED driver surge protection
  • Industrial automation equipment and control modules
  • Consumer electronics and power adapters
  • Communication and telecom systems (DC rail protection)

XKT Series Demonstration Video
Reliable surge protection across 18 V–1800 V applications

The following video introduces the Kingtronics XKT Series and shows how this MOV-based surge suppression approach helps protect real-world power systems.

Explore the Kingtronics XKT Metal Oxide Varistor Series
Product information, datasheet, RFQ / sample request

For full technical details, electrical ratings, and available disc sizes (5D / 7D / 10D / 14D / 20D), visit the official Kingtronics XKT Metal Oxide Varistor product page.

View XKT Metal Oxide Varistor Series

To request a quotation, samples, or cross-reference support for sourcing:

Contact Kingtronics Sales Team

Download the Kingtronics Varistor Catalog
Full XKT family overview and detailed electrical ratings

Kingtronics XKT Series catalog cover showing XKT / RKT / WKT / NKT surge protection and varistor product families

Kingtronics XKT / RKT / WKT / NKT Varistor Catalog (PDF)

View the complete Kingtronics varistor product range, including XKT Series Metal Oxide Varistors, package dimensions, voltage range, surge energy capability, and ordering information.

Open Full Catalog (PDF)

The catalog helps sourcing teams compare part numbers and check available voltage ratings across 18 V to 1800 V application requirements.

Technical Reference for Engineering Teams
Operating range, energy rating, environmental compliance

  • Operating temperature range: –40 °C to +105 °C
  • Available disc sizes / series: 5D, 7D, 10D, 14D, 20D
  • Energy absorption capability: approximately 0.4 J up to 606 J (10/1000 µs waveform, depending on series size)
  • High peak surge current performance (up to 20 A series rating class)
  • RoHS and REACH compliant
  • AC and DC working voltages from 18 V class up to 1800 V class across the full Kingtronics XKT range

Kingtronics® XKT Metal Oxide Varistor Series — surge protection for power supply, LED driver, telecom and industrial control applications.
Protect your design, improve long-term reliability, and maintain stable operation under real-world transient conditions with a qualified surge suppression component.

 

Why Stable MLCC Supply Matters in Power & RF Applications

22 Oct 2025

Kingtronics International Company — Inspired by Innovation

In modern manufacturing, stable MLCC supply is critical to prevent costly delays. Engineers in power electronics, RF circuits, and industrial systems need consistent materials and predictable lead time. Kingtronics® offers SMD and Radial MLCCs with fast delivery and competitive pricing.

Kingtronics MLCC overview — HKT High Voltage, BKT High-Q RF, LKT SMD, MKT Radial capacitors

Video — High Voltage MLCC & Low ESR Tantalum Capacitors

HKT — High Voltage MLCC for Power & Industrial Systems

Up to 5,000 V rating with low loss dielectric and excellent insulation. Ideal for converters, lighting and industrial controllers.

Explore HKT →

BKT — High-Q / Low-ESR MLCC for RF & Microwave

High-Q (>2000) and ultra-low ESR for RF amplifiers, antennas, and microwave modules where precision and low dissipation are essential.

Explore BKT →

LKT — Compact SMD MLCC for Communication & Consumer Devices

Available in NP0, X7R, and X5R. Provides stability and reliability in communication modules, motherboards, and compact electronics.

Explore LKT →

MKT — Radial MLCC for Power Modules & LED Drivers

Leaded structure (25 – 100 V) with strong mechanical endurance, suitable for industrial modules, LED drivers, and control boards.

Explore MKT →

MLCC Series Comparison

Series Type Key Features Voltage Range Applications
HKT SMD High Voltage, Low Loss Up to 5,000 V Power converters, industrial control
BKT SMD High-Q, Low ESR RF / Microwave RF modules, antennas
LKT SMD Compact, Stable Dielectric Up to 50 V Comms modules, consumer electronics
MKT Radial (Leaded) Robust, THT Friendly 25 – 100 V LED drivers, power modules

Ready to get a quote? Fast lead time and stable supply.

Request a Quote

Procurement & Sampling

Kingtronics® MLCC portfolio ensures stable global supply, ISO-certified quality and competitive pricing.

Explore MLCC Products

How to Choose the Right X2 Film Capacitor for Power Supply Safety

13 Oct 2025

 

Kingtronics International Company — Inspired by Innovation

When designing EMI filters or power supplies, choosing the right X2 film capacitor directly affects safety and long-term reliability. Certified X2 devices prevent insulation breakdown, reduce electromagnetic interference, and help meet global compliance.

Why Certification Matters

A qualified X2 capacitor must endure repetitive AC stress and transients. Kingtronics FKT-MX, rated at 310 VAC, carries VDE, ENEC, and UL approvals in accordance with IEC 60384-14. It is designed for across-the-line EMI suppression in power supplies, LED drivers, and industrial control systems where high stability and low loss are essential.

Key Specs (Design Reference)

Rated voltage
310 VAC
Capacitance range
0.0047 µF – 10 µF
Operating temperature
−40 °C ~ +110 °C
Dissipation factor
≤ 0.3 % (capacity-dependent)
Safety approvals
VDE / ENEC / UL

Use certified X2 components only in AC line positions. Verify lead pitch, body size, creepage, and clearance for your PCB.

Key Search Terms

x2 film capacitor 310vac UL ENEC VDE certified capacitor EMI filter capacitor x2 safety film capacitor polypropylene capacitor for EMI suppression

Common Challenges in EMI Filter Design

  1. Excessive noise or leakage due to low-grade dielectric materials.
  2. Compliance failures when uncertified components are used.
  3. Capacitance drift and heating in polyester-based X2 parts.
  4. Uncertain availability or long lead times from legacy brands.

How FKT-MX helps

  • Polypropylene dielectric for superior temperature and voltage stability (−40 °C ~ +110 °C).
  • Low dissipation factor ≤ 0.3%.
  • Wide capacitance range 0.0047 µF – 10 µF for flexible design.
  • Predictable lead time with stable production capacity.

Comparison with Global Alternatives

X2 Cross-Reference (310 VAC Class)
Kingtronics Model Kemet EPCOS Pilkor Evox Rifa Vishay Wima Iskra Panasonic
FKT-MX (310 VAC) R46 B81130 / B32921–B32924 PCX2 337 / PCX2 339 PHE 840M / PHE 840E MKP 3382 / MKP 3392 MP3 X2 / MKP X2 KNB 153X / KNB 156X ECQU

FKT-MX offers equivalent safety approvals with cost-effective structure and dependable delivery. It serves as a practical replacement for well-known X2 families in EMI suppression applications.

Watch the Product in Action

Demo overview of FKT-MX in EMI suppression use cases.

Learn More

See full specifications, datasheet, and available sizes on the official website:

See FKT-MX Specs Contact Kingtronics

FAQ

What is an X2 film capacitor?
It is a safety-rated capacitor intended for across-the-line connection on AC mains to suppress EMI.

What certifications does FKT-MX have?
VDE, ENEC, and UL approvals according to IEC 60384-14.

What operating range should I consider?
310 VAC rating, 0.0047 µF – 10 µF capacitance, and −40 °C to +110 °C operating temperature.

Is it a suitable alternative to EPCOS/Kemet X2 parts?
Yes. FKT-MX is a practical replacement in EMI suppression filters, with cross-references listed above.

Kingtronics FKT-MX X2 film capacitor product image

Panasonic & Nichicon Cross Reference｜Kingtronics SMD Capacitors

30 Sept 2025

Kingtronics International Company — Inspired by Innovation

When engineers or buyers look for Panasonic electrolytic capacitor alternatives or a Nichicon cross reference, reliability without compromising cost or lead time is essential. Kingtronics provides a full series of SMD Aluminum Electrolytic Capacitors (ECAPs) delivering competitive price, fast delivery, and proven performance — a practical replacement for Panasonic, Nichicon, and Rubycon in LED, power supply, automotive, and communication applications.

Cross Reference Table

Quick mapping for common replacements across major brands.

Kingtronics SMD Aluminum Electrolytic Capacitors – Cross Reference
Kingtronics P/N Panasonic Nichicon Nippon Chemicon Rubycon Samwha Yageo EPCOS
GKT-VA EEE-_A/S UWX MVA SEV SC CA B41112 / B41115
GKT-VT EEE-HA(B) UWT MVE SKV RC CB B41141 / B41145
GKT-VZ EEE-FC WF MZA / MVY TZV CK SQ —
GKT-VF EEE-FK UD MLA — CM — —

👉 Explore Full Cross Reference & Product Series

Why Choose Kingtronics SMD Capacitors?

  • Cross Reference Compatibility — Direct replacements for Panasonic, Nichicon, Rubycon, Samwha, Yageo, EPCOS.
  • Comprehensive Range — Standard / low impedance / super low impedance / long life (up to 10,000H), with AEC-Q options.
  • Customer Advantages
    1. Faster lead time versus top brands
    2. Competitive pricing with broad specs
    3. High conversion after sampling
    4. Temperature coverage up to 125°C
    5. Automotive AEC-Q options available

Typical Applications

  • LED Lighting & Industrial Power Supplies
  • Automotive Electronics (ECU, infotainment, chargers)
  • Communication Infrastructure
  • Consumer Electronics (Smart TV, chargers, adapters)

Inside the Factory – Production Process

See how Kingtronics produces reliable SMD Aluminum Electrolytic Capacitors in our factory:

Explore ProductsContact Our Engineers

📥 Need details? Download Full Catalog

Kingtronics SMD Capacitors – Cross Reference & High Reliability
Kingtronics SMD Capacitors

 

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Contact us

Tel: (86) 769 8118 8110
Tel: (852) 8106 7033
Fax: (852) 8106 7099
E-mail: info@kingtronics.com
Microsoft Teams: Kingtronics.sales via Teams
WhatsApp: Chat with us on WhatsApp
Web: www.Kingtronics.com
YouTube: www.youtube.com/c/Kingtronicskt

About

Kingtronics International Company was established in 1995 located in Dongguan City of China to handle all sales & marketing for factories located in Chengdu, Sichuan and Zhaoqing, Guangdong, China. In 1990, we established the first factory to produce trimming potentiometer and in 1999 we built up new factory in Zhao Qing, Guangdong. Now with around 850 workers, Kingtronics produce trimming potentiometers, dipped tantalum capacitors, multilayer ceramic capacitors, and diode & bridge rectifier. We sell good quality under our brand Kingtronics, and Kt, King, Kingtronics are our three trademarks. All our products are RoHS compliant, and our bridge rectifier have UL approval. Please visit our Products page, you could please download all our PDF datasheet and find cross reference for our Trimming Potentiometer and capacitors.

Tantalum and Ceramic Capacitors Cross Reference ↓ Download
Diodes & Rectifiers List(PDF: 97KB) ↓ Download
Trimming Potentiometer Cross Reference ↓Download

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