Infineon Technologies – CoolSiC™ JFET Technology

Infineon Technologies CoolSiC™ JFET Technology

High-voltage silicon carbide technology for solid-state power distribution

Infineon Technologies’ CoolSiC™ JFET technology is engineered to meet the demands of next-generation solid-state power distribution, where high efficiency, fast switching, robustness, and reliability are critical. By combining the advantages of silicon carbide (SiC) with advanced chip design and innovative packaging, CoolSiC™ JFETs deliver exceptional performance for high-voltage switching and protection applications. With 750 V and 1200 V options and on-resistance values down to 1.6 mΩ, the technology helps minimize conduction losses and support high-current applications.

Designed to accelerate the transition from conventional electromechanical protection to solid-state circuit breakers (SSCBs), CoolSiC™ JFETs enable significantly faster switching for rapid fault isolation, reduced system damage, minimized downtime, and longer system lifetime. Advanced .XT interconnection technology further improves thermal performance and robustness under pulsed and cyclic loads, supporting reliable operation under demanding overload and fault conditions. CoolSiC™ JFETs can also enable drop-in replacement of existing SiC MOSFET designs without requiring PCB redesign, simplifying integration and scalability.

CoolSiC™ JFET technology is suited to a broad range of next-generation power architectures, including AI data centers, solid-state circuit breakers, high-voltage relays, battery disconnect units, motor soft starters, high-voltage hot-swap, surge protection, power distribution switches, eFuses, and DC breakers. By combining low losses, fast and reliable solid-state protection, and robust operation, CoolSiC™ JFETs help enable more efficient, responsive, and resilient power distribution systems.
 

CoolSiC™ MOSFET vs. CoolSiC™ JFET Technology

CoolSiC™ JFET – Equivalent Circuit Diagram

Evaluation Board

UG115844

The JFET evaluation board serves as a platform to evaluate the performance of Infineon Technologies’ latest CoolSiC™ technology switches in Q-DPAK packages, which meets the RDS(on) requirements for solidstate circuit breaker (SSCB) applications. This document focuses primarily on evaluating CoolSiC™ JFETs.

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