Military-grade SMPS stacked capacitors

9 July 2008 Passive Components

Targeting the defence and aerospace markets, Kemet has introduced military-grade ceramic stacked capacitors for use in high-frequency power supplies. The products are commonly referred to as Switch Mode Power Supply Stacked Capacitors, or SMPS Stacked Capacitors. The product line is qualified to Military Performance Specification MIL-PRF-49470 and DSCC Drawing 87106. The capacitors are intended for high-reliability SMPS and pulse energy applications. Their low equivalent series resistance (ESR) and equivalent series inductance (ESL) make them ideally suited for input and output filtering of power supply applications as well as snubber applications.

These capacitors are now available in case codes 3, 4, and 5, X7R dielectric, voltage ratings from 50 V d.c. up to 500 V d.c., and capacitance values up to 47 μF. The chip stack is horizontal and the leadframe attachment is a high-temperature solder. They are also available in unencapsulated (unpotted bare chips) or encapsulated (potted assembly) styles. The encapsulated styles are primarily used for applications where increased mechanical and environmental protection is required, such as in avionics systems.

With an operating temperature range between -55°C and +125°C, and with capacitance shift limited to ±15% over that range, these SMPS stacked capacitors are suited to electrical applications, general purpose applications and high-frequency power supply circuits.

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