TDK Launches DC-Link Film Capacitors Rated for 135°C Operation
The B3272*A/G/T series uses a polypropylene and cyclic olefin copolymer blend to provide thermal headroom for EV power electronics.
TDK has announced the B3272*A/G/T series of DC-link film capacitors, which are qualified for continuous operation at case temperatures up to 135° C. The components are designed primarily for electric vehicle traction inverters, on-board chargers, and automotive DC-DC converters.
What Happened
The new capacitors utilize TDK’s EPN dielectric, a blend of polypropylene and cyclic olefin copolymer that the company states has been previously validated in its ModCap UHP power capacitors. Unlike standard polypropylene film capacitors that require derating as temperatures rise, this series requires no derating up to 105° C. The components feature rated DC voltages between 800 and 1,200 V and capacitance values ranging from 1.0 to 60 µF. They are available in two-pin and four-pin configurations with lead spacings of 27.5 mm, 37.5 mm, and 52.5 mm. Maximum RMS current, specified at 85° C and 10 kHz, ranges from 3.5 A to 24 A depending on the specific type. TDK specifies a useful life of 100,000 hours at rated voltage and 85° C.
Why It Matters
DC-link capacitors are critical components in EV power electronics, absorbing ripple current drawn by switching stages, which generates heat within the film. Higher power densities and confined spaces in modern electric vehicles increase thermal and electrical stress on these passive components. By offering greater thermal headroom, the new series allows designers to potentially manage heat more effectively in traction inverters and chargers without the performance penalties associated with derating. The four-pin G types are noted for supporting low-inductance busbar interfaces, which helps reduce parasitic loop area in fast-switching inverter stages, while the low-profile B32726T variant targets height-constrained layouts. The series is AEC-Q200E qualified and RoHS-compatible, with cases complying with UL 94 V-0 flame-retardant standards.
The Bottom Line
TDK’s new B3272*A/G/T series offers a high-temperature solution for EV and industrial power electronics, combining self-healing properties with overvoltage capability. The company provides SPICE model libraries and the web-based Capacitor Life And Rating Application (CLARA) tool to support engineering integration.
