SiC (silicon carbide) is a wide-bandgap semiconductor material. SiC MOSFETs offer lower conduction loss, faster switching and higher temperature tolerance than silicon counterparts, suiting high-efficiency, high-power-density power supplies and new-energy applications such as PV inverters, energy storage and onboard chargers. Beyond the usual voltage/current specs, selection also needs to weigh temperature stability and gate-drive matching.
Reading the Key Parameters
- VDS_Max (drain-source voltage rating): listed parts span roughly 650V~1200V, matching the voltage classes common in PV, energy storage and automotive applications.
- RDS(ON) (on-resistance @VGS=18V): listed parts run roughly 15mΩ~390mΩ typical at 25°C and roughly 20mΩ~545mΩ typical at 175°C. The rise with junction temperature is far smaller than for silicon devices — size conduction loss against the maximum operating junction temperature, not just room-temperature figures.
- VGS(th)_Typ (gate threshold voltage): listed parts run roughly 2.8V~3.4V, notably lower than typical silicon MOSFET thresholds. This raises the bar on gate-drive noise immunity and negative turn-off bias design, and should be checked against the driver IC's output levels.
- ID_Max (maximum drain current): listed parts span roughly 6A~134A — select with margin over the actual load current and cross-check continuous-current capability against package thermal resistance.
- Package: TO247-4L (including Notch/Kelvin-source variants), TO220F-3L, TO252-3L and TOLL all appear; four-pin packages typically reduce source parasitic inductance and improve switching speed.
Three Steps to Select
- Set the VDS class against system bus voltage plus margin;
- Size actual RDS(ON) — and conduction loss — against the maximum junction-temperature condition;
- Confirm the driver IC's output levels and pin layout (including Kelvin source) match VGS(th) and the chosen package.
Common Pitfalls
- Comparing only room-temperature RDS(ON) figures while ignoring how differently silicon and SiC devices rise at high temperature, understating actual loss;
- Carrying over silicon MOSFET drive-voltage and dead-time settings without accounting for the false-turn-on risk from SiC's lower threshold voltage;
- Overlooking the extra demands fast dv/dt switching places on gate-drive layout and EMC design.
More parts can be filtered by VDS, RDS(ON), package and other criteria in the online selector; submit a part inquiry for specific fit questions.
Related guide: SiC MOSFET Discretes Selection Guide