TDK Corporation has introduced the ModCap UHP (B25648A) series of dc-link capacitors for high-power power electronics operating at elevated temperatures.
The series supports continuous operation at hotspot temperatures up to 105° C without derating, increasing usable current density compared with earlier designs that required derating at lower temperatures.
The electrical ratings align with 800-V electric vehicle (EV) architectures using SiC-based traction inverters and onboard chargers.
The capacitors are rated for 1350 V to 1800 Vdc, with capacitance values from 470 to 880 µF and an equivalent series inductance of 8 nH to support high switching frequencies and limit voltage overshoot. Lifetime specifications of up to 200,000 hours at 105° C address thermal and reliability constraints common in compact EV inverter and power electronics housings.
The modular cubic form factor is intended to simplify laminated busbar integration, reducing loop inductance and minimizing the need for additional snubber components in high-power converter layouts. The design uses a high-temperature polypropylene dielectric and a housing compliant with UL94 V-0 and EN 45545-2 HL3 fire requirements, supporting use in traction and automotive-adjacent environments.
Target applications include EV traction inverters, high-power onboard chargers, and other dc-link applications using SiC power switches, as well as industrial motor drives, renewable energy converters, and rail traction systems.
Filed Under: Power Electronics, Technology News