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Robust film capacitors with low self-inductance boost design flexibility

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By Nick Flaherty


TDK has launched a series of EPCOS film capacitors for high voltage DC link applications that feature high energy and power density.

The B3271*H* capacitors are rated for voltages from 500 V DC to 1600 V DC with capacitance from 0.47 µF to 170 µF and are suitable for a maximum operating temperature of up to 105 °C.

The self-inductances of only 11.5 nH to 23 nH combined with the high ripple current capability make the capacitors particularly well suited for SiC-based inverters operating at high switching frequencies.

At a rated voltage and operating temperature of 70 °C, the typical life of the rugged, self-healing and RoHS-compliant capacitors is 95,000 hours. This is a key consideration for film capacitors.

The capacitors are available in lead spacings of 27.5, 37.5 and 52.5 mm, with both 2-pole and 4-pole versions. This results in more than 90 types, offering high design flexibility. Suitable film capacitors for DC link designs can be selected through TDK’s CLARA tool.

The series is qualified to IEC 61071, AEC-Q200 as well as UL 810 and enables use in typical industrial applications such as frequency converters, photovoltaic inverters, EV fast chargers and automotive applications such as onboard chargers and auxiliary and power inverters.

www.tdk-electronics.tdk.com/en/film_mkt.

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