App note: Aluminum electrolytic capacitors design for long operational life

App note from KEMET on long life electrolytic capacitors. Link here (PDF) The service life for high quality power supplies and automotive power electronics is often limited by electrolytic capacitors’ operational life (Lop). Very long life (> 20 years at temperature up to 75C) is possible to be achieved by choosing capacitors with optimized design. […]

App note: Comparison of ceramic and tantalum capacitors

  App note from KEMET about the replaceability between ceramic and tantalum capacitors to each other. Link here (PDF) Ceramic capacitors have a multitude of dielectric types available and each of these types is characterized by their sensitivities to temparature, but not to voltage or time. This paper compares the X7R, X6S, or X5R dielectric […]

App note: Capacitors for reduced microphonics and sound emission

Capacitors are sensitive to audio frequency and can pick-up and emit said energy. Here’s an app note from KEMET about these. Link is here Multilayer ceramic capacitors (MLCC), made with class 2 or class 3 dielectrics, typically exhibit a piezoelectric effect when placed under electric field.  The piezoelectric effect results in a physical distortion with […]

App note: Why that 47 uF capacitor drops to 37 uF, 30 uF, or lower

App note from KEMET about the decreasing value of capacitance with respect to its rated value. Link is here There are a couple of reasons why the capacitance value marked on the device you have, may not read anywhere near that value in the circuit application in which it is intended.  The two major contributors […]

App note: Measure capacitance of Class-II and Class-III ceramic capacitors

KEMET’s app note(PDF) on the methods used on measuring capacitance of different classes of ceramic capacitors. This application note addresses proper capacitance measurement techniques of Class-II (X7R/X5R) and Class-III (Y5V/Z5U) ceramic capacitors and identifies common errors that are made upon incoming inspection or after board assembly. Errors are highlighted and provides instruction for better electrical […]

App note: Bodo’s Power Systems: Capacitors for critical applications get better by design

Great read(PDF) from KEMET on the design features and screening methods applied to electrolytic and tantalum capacitors to prevent long-term deterioration or sudden unexpected failures. Wherever electronic equipment is used such as in the home, at work, in-car, or in defense equipment users typically expect perfect reliability while the technology itself should ideally be invisible […]

App note: Decoupling solutions

App note (PDF) from KEMET on different decoupling capacitors for each board power line requirements. Integrated circuit (IC) technology has advanced over time, requiring innovative decoupling solutions that address decoupling needs over the entire power path from the main power supply to the logic gates on the IC. As one follows the path from the […]

App note: LED lighting and supercapacitors

An app note (PDF) from KEMET on coupling two high lifetime devices: LEDs and Supercapacitors. Light emitting diodes, or LEDs, have come to prominence in recent years in conventional lighting applications including flash lights, street lamps, traffic lights and emergency lighting. Their advantages over incandescent and compact fluorescent light sources include greater robustness, higher energy […]