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Polymer Tantalum: Not Your Grandparent’s Derating Rules

Date Added: Thursday, May 2, 2019

Why Derate? Derating is a term that is frequently used but not always in the right context or for the right reasons. Oftentimes one or more parameter of a device is derated to improve some type of performance. Said performance metric could be quiescent current or it could be life. In the case of tantalum capacitors voltage is derated in an effort to improve the life of the capacitor.


Date Added: Thursday, July 23, 2015

Polymer tantalum capacitors use a conductive polymer for their cathode layer. This gives them the volumetric efficiency of traditional tantalums but with significantly lower ESR and a non-ignition failure mode.

Derating Differences for Tantalum and Polymer (KO and AO)

Date Added: Thursday, July 16, 2015

Surface amount electrolytic capacitors may have different derating rules associated with them, depending on their dielectric and cathode technologies. This CARTS 2004 paper shows why Tantalum, KO-CAP®, and AO-CAP® Capacitors have different derating guidelines.

KO-CAP® Reliability

Date Added: Friday, August 14, 2015

The demand for Low-ESR tantalum capacitors has popularized the use of high conductivity conductive polymer counter electrode designs over more established manganese dioxide (MnO2) tantalums.

KO-CAP Assessment Redefines Established Reliability Screening

Date Added: Monday, May 23, 2016

High reliability and aerospace applications are moving forward fast. Just like consumer counterparts, newer technology components are necessary. However, unlike consumer counterparts, specialized testing is needed for parts, and the MIL-PRF may not always apply. The new Assessment Test for KO-CAP redefines Established Reliability screening for Polymer capacitors.

Reliability of High-Voltage (>25V) KO-CAP®

Date Added: Friday, September 11, 2015

KO-CAP or Polymer capacitors provide lower ESR than other bulk electrolytic capacitors. The early polymer devices were rated for 16V and less. Higher voltage capacitors with ratings up to 35V, 50V, and 63V are now available with reliability on par with their lower-voltage siblings.

KO-CAP Established Reliability Screening Improves Radar Application

Date Added: Tuesday, September 20, 2016

In business, it pays to listen and respond to your customers. At the very least, you gain a satisfied customer but, in many cases, customer-responsive companies can gain much more. This blog post recounts how a close engagement with an important client changed the way that polymer electrolytic capacitors are qualified for high reliability COTS applications.

MLCC Shortage: When you can’t find the cap needed

Date Added: Saturday, May 5, 2018

Industry-wide capacity issues in the MLCC market are leading engineers and designers to seek alternative solutions. While there won’t always be substitutes available, given certain conditions, suitable replacements are available in other technologies.

Are These 5 Tantalum Capacitor Myths True?

Date Added: Monday, October 26, 2015

Think you know Tantalum? Think again, here are 5 tantalum capacitor myths that aren’t true (anymore).


Date Added: Wednesday, March 13, 2019

Surface Mount Industrial Grade T52x/T530 Polymer Electrolytic Capacitors T522 Reduced Leakage Polymer Tantalum T528 Low ESL Polymer Electrolytic for CPU/GPU Decoupling Solid State Drives/High Energy Applications Polymer Electrolytics Tantalum Stack Polymer (TSP) Series T545 High Energy Storage Polymer Electrolytic, 6.3 – 20 VDC Automotive Grade T591/T598/T599 High Humidity/High Temperature Automotive Grade Polymer Electrolytic 105°C/125°C High […]

Automotive Polymer Electrolytic Capacitors

Date Added: Tuesday, March 1, 2016

Automotive polymer electrolytic capacitors such as KEMET’s T598 are the industry’s first AEC-Q200 qualified polymer capacitors. This application note discusses what a polymer capacitor is, the improvements KEMET made to pass AEC-Q200 and introduces how they can be moved from your hand to your dashboard.

Aluminum Polymer Capacitors on EE Journal’s Chalk Talk

Date Added: Monday, October 30, 2017

Learn the difference between aluminum polymer capacitors and aluminum electrolytics in this EE Journal Chalk Talk. Co-developed with Mouser Electronics, James and Amelia answer some basic questions about this unique, and dare we say, cool capacitor type.

Tantalum Capacitor Manufacturing

Date Added: Tuesday, August 18, 2015

What is the difference between polymer and MnO2 tantalum?

Date Added: Tuesday, March 15, 2016

Achieving Low ESR Polymer Capacitors

Date Added: Sunday, July 26, 2015

KEMET Electronics Corp has implemented several process and material improvements in order to improve the surface mount (SMT) performance of low ESR conductive polymer (KO-CAP) capacitors.

Derate tantalum capacitors by how much? | Ask an FAE

Date Added: Tuesday, January 24, 2017

Demystify the confusing topic of voltage derating tantalum capacitors. The rule of thumb to voltage derate 50% doesn’t apply to all capacitors.

Tantalum Capabilities

Date Added: Wednesday, July 15, 2015

Learn why KEMET is the tantalum capacitor supplier of choice for the most dynamic segments of the electronics industry. Engineers looking to expand the possibilities in automotive, aerospace, communications and other fast-growing segments of the electronics industry choose KEMET tantalum capacitors.

What is the operating life for an AO-CAP® capacitor?

Date Added: Thursday, July 23, 2015

AO-CAP, or aluminum polymer, technology is a solid-state device, meaning, it does not have a wear out factor.

Detailed Data for Automotive Polymer Capacitors

Date Added: Wednesday, December 2, 2015

Understand the construction and technical challenges of the T598 Polymer Electrolytic Capacitor series. These are for the first Polymer Electrolytic capacitors to pass AEC-Q200 qualifications.

Polymer Capacitor High Reliability Assessment

Date Added: Monday, October 3, 2016

Tantalum polymer capacitors are expanding their market share in the commercial world because they offer superior electrical performance (primarily much lower ESR), have outstanding reliability, and display a more benign failure response than the incumbent MnO2-cathode tantalum capacitor technology. It is natural that engineers want to use this new technology in high-reliability applications.

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