UnitedSiC adds SiC 1200 and 650V JFETs

UnitedSiC has added to its family of standalone normally-on SiC JFETs with its Generation 3 1200 and 650V silicon carbide (SiC) JFETs.

The devices are normally-on with zero voltage gate drive. This makes them suitable for applications such as very fast action, solid-state circuit breakers and circuit protection where a default to an on-state is necessary in the absence of gate power, explains UnitedSiC.

The UJ3N120070K3S is a 1200V, 70mOhm device, the UJ3N120035K3S is a 1200V, 35mOhm device, the  UJ3N0650080K3S is rated at 650V and 80mOhm wand the UJ3N065025K3S is a 650V, 25mOhm SiC JFET. All are available in a TO-247-3L package.

The SiC JFETs are also commonly used in series connection with a Si-MOSFET as robust ‘supercascodes’, which have all the advantages of wide band-gap technology with very high operating voltages and easy gate drive. They can also be used where electronic loads, wireless charging synchronous rectification and power switches in low power flyback converters use the JFET in a cascode configuration for easy start-up.

The SiC JFETs target circuit protection in rail, electric aircraft and traction and high voltage switching power conversion.

SiC JFETs can be paralleled easily, due to their positive temperature co-efficient of RDS on and flat gate threshold voltage curve over temperature. When operated in linear mode, SiC JFETs exhibit a wide safe operating area (SOA) without current crowding and current filament formation, making them suitable for electronic loads and current limiters. There is no gate oxide, which gives the SiC JFETs radiation hardness and general robustness, adds UnitedSiC.

UnitedSiC uses its proprietary six-inch wafer process in the fabrication of the devices with advanced wafer-thinning and die-attach techniques for junction-to-case thermal resistance.

UnitedSiC develops silicon carbide (SiC) FET and diode power semiconductors that are claimed to deliver the industry’s best SiC efficiency and performance for electric vehicle (EV) chargers, DC/DC converters and traction drives, as well as telecomms/server power supplies variable speed motor drives and solar PV inverters.


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