Stacked multi-layer ceramic caps rated to 200°C

August 25, 2014 // By Graham Prophet
AVX has extended its high temperature SMX Series stacked SMPS MLCCs with the addition of new 25V ratings in case sizes 3-5 and 500V ratings in every case size (1-6), making it the broadest offering of stacked SMPS MLCCs rated to 200°C currently available.

Providing several significant advantages over both typical MIL-qualified MLCCs (which are only rated to 125°C) and comparable wet tantalum capacitors, SMX Series MLCCs exhibit excellent high frequency performance, exceptional capacitance retention with frequency, high current handling capabilities, a wide frequency response in high pulse, high current applications, and low ESR, ESL, and DC leakage.

Specifically designed for use in high temperature, harsh environment applications up to 200°C, SMX Series stacked SMPS MLCCs are constructed using high temperature solder and exhibit rugged thermal shock, mechanical shock, moisture resistance, and vibration resistance capabilities per MIL-STD-202. SMX Series capacitors are suitable for use in down-hole oil, gas, and mineral exploration equipment, including geophysical and geothermal probes, seismic sensors, and signal amplifiers. The series is also ideal for use in military, defence, and weapons systems; space and satellite communications equipment; automotive engine compartment and hybrid electric vehicle (HEV) applications; and rugged AC/DC power converters (e.g., those that supply AC power from onshore power grids to offshore oil platforms).

SMX Series capacitors are suited for use as DC filters in high power, high frequency ripple currents, high pulsed-current circuitry, and a range of low power electronics; EMI filters on AC inputs; DC link capacitors for AC/AC and DC/AC motor drive inverters; and start-and-run capacitors in AC induction motors.

Available in both C0G and X7R dielectrics, SMX Series stacked SMPS capacitors are available in six case sizes with voltage ratings spanning 25V to 500V and capacitance values spanning 0.0039 µF to 270 µF. Operating temperatures for the series range from -55°C to 200°C.

SMX Series capacitors are also available with several customisation options, including: custom geometries, packages, terminals, lead configurations, and stress relief mounting options, all of which allow engineers to achieve higher efficiency, space-saving designs with enhanced mechanical and thermal reliability. Performance characteristics for the series, including: temperature vs. applied current, ESR and impedance vs. frequency, maximum current vs. frequency, maximum ripple voltage vs. frequency,