Extended range, ratings for mil-spec capacitors

April 02, 2013 // By Graham Prophet
AVX has introduced 25V rating and extended capacitance range to its MIL-PRF-49470 SMPS capacitor family; the SMPS series MLC capacitors are suited to high-current, high-power and high-temperature applications.

AVX has added a 25V capacitor to the original 50-500V offering. The new 25V SMPS capacitor currently features standard MIL-PRF-49470 Level “B” reliability; however, a parallel component with T-Level reliability for space applications is under qualification. AVX says it is currently the only supplier listed on the 25V MIL-PRF-49470 QPL. Consequently, this latest expansion of the SMPS Series will provide engineers with a much-needed lower voltage capacitor solution using proven technology specifically designed for applications that require high-reliability performance in harsh environments.

Designed for high-current, high-power, and high-temperature applications, MIL-PRF-49470 SMPS capacitors exhibit very low ESR and ESL and can withstand temperatures ranging from -55°C to +125°C. Primarily used in the input/output filters of high-power and high-voltage power supplies, as well as in bus filters and DC snubbers for high-power inverters, the SMPS Series is also suitable for DC/DC converters, general and switched-mode power supplies, aerospace instrumentation panels, and a variety of hybrid power and military applications.

SMPS Series capacitors are available in six case sizes and with a variety of through-hole and surface-mount lead options in order to both provide effective mechanical decoupling of the ceramic chips from the board and minimise stress during board flexing, vibration, and temperature cycling in a broad range of applications. Lead frames are attached to the chips using high temperature solder, so there is no risk of solder reflow during board assembly. SMPS Series capacitors are also available in both unencapsulated (MIL-PRF-49470/1) and encapsulated (MIL-PRF-49470/2) packaging technologies, providing design engineers with an enhanced reliability and durability option. Capacitance are: 25V = 1.5–390 μF, 50V = 1-270 μF, 100V = 0.68-180 μF, 200V = 0.47-120 μF and 500V = 0.15-39 μF.