ModCap Modular Capacitor Concept

The TDK Corporation ModCap UHP (B25648A) series of DC link capacitors set the latest benchmark for power electronic applications. UHP stands for ultra-high performance, and this series enables continuous operation at hotspot temperatures of up to +105°C without power derating. Compared to previous ModCap generations that required derating starting at +90°C, the design enables higher current density and a longer lifetime in challenging conditions.

By combining a high-temperature dielectric with a modular design, the ModCap UHP series extends the lifetime of capacitors to 200,000 hours at +105°C and supports a 20% higher current density. With a DC voltage rating of 1350 V to 1800 V and a capacitance ranging from 470 µF to 880 µF, the series is optimized for SiC semiconductor-based inverters that require low inductances (ESL of 8 nH) and high-frequency performance.

These capacitors target fast-growing sectors, including renewable energy (solar and wind power, electrolyzers), energy storage, and inverters for railway and industrial drives. Their cubic design (205 mm x 90 mm x 170 mm; L x W x H) simplifies busbar integration, thereby increasing power density in compact converters and reducing the need for additional snubber capacitors.

Beyond performance, the ModCap UHP advances sustainability and safety. The dielectric film is ISCC-certified biocircular BOPP, while the housing complies with UL 94 V-0 and EN 45545-2 HL3 R23 fire standards. UL recognition is pending.

For ModCap, TDK offers a set of different engineering tools, including a SPICE library, the web-based capacitor life and rating application (CLARA), and the web-based CAP thermal for thermal simulation.