capacitors, stacked capacitors, KEMET

Military SMPS stacked capacitors

News Release from: Kemet Electronics
28/02/2008

KEMET Corporation has introduced military-grade ceramic stacked capacitors for use in high-frequency power supplies. The products, commonly referred to as Switched-Mode Power Supply (SMPS) Stacked Capacitors, are qualified to Military Performance Specification MIL-PRF-49470 and DSCC Drawing 87106. The new components are intended for high-reliability SMPS and pulse energy applications. Their low Equivalent Series Resistance (ESR) and Equivalent Series Inductance (ESL) specifications make them ideally suited for input and output filtering in both power supply and snubber applications.

The capacitors are available in case codes 3, 4, and 5, X7R dielectric, and with voltage ratings from 50 VDC up to 500 VDC. Capacitance values of up to 47 µF may be specified. The devices feature a horizontal chip stack and the leadframe attachment is a high-temperature solder. Parts are also available in unencapsulated (unpotted bare chips) or encapsulated (potted assembly) styles. The encapsulated style is primarily used for applications where increased mechanical and environmental protection is required, such as in avionics systems. The Military performance specification MIL-PRF-49470 is used to establish a baseline part for high-reliability applications.
With an operating temperature range of -55°C to +125°C, and with capacitance shift limited to ±15 percent over that range, KEMET’s SMPS stacked capacitors are an excellent choice for electrical applications, general purpose applications and high-frequency power supply circuits.

Another new product introduction focused on the defence and aerospace sector demonstrates KEMET’s ongoing commitment to this market segment,” stated Travis Ashburn, KEMET Product Line Manager for Specialty Products. “As we strive to become The Capacitance Company, we continue to build on our decades of experience in the military and high-reliability segments to develop new products to service this key market.”