750V trench SiC FET takes on silicon

December 04, 2020 // By Nick Flaherty
750V trench SiC FET takes on silicon
A 750V silicon carbide trench device will take on silicon MOSFETs directly says Chris Dries, CEO of UnitedSiC

UnitedSic has launched its fourth generation of silicon carbide FET, moving to a 750V trench device that the founders believe will shake up the market.

“We are going to put silicon to bed,” said Chris Dries, CEO and founder of UnitedSiC tells eeNews Europe . “We took the feedback on Gen3 which has been out for three years now and we built an entirely new platform.”

“For new 18mΩ and 60mΩ FETs we’ve added a 750V platform option as the lead devices for our customers that want to operate at 400 and 500V while improving all the key figures of merit. We’ve improved the switching performance and because the device is so much smaller we’ve reduced the output capacitance,” he said. Thecompany has Analog Devices as a strategic investor.

As with previous devices, the new parts use a silicon MOSFET co-packaged with the SiC normally-on JFET. This allows a gate drive of +/-20V with a 5V threshold voltage so that all devices can be driven with 0 to +12V gate voltages. This means they work with existing SiC MOSFET, Si IGBTs and Si MOSFET gate drivers and operate up to 500kHz.

“We are able to maintain a 0 to 12V gate drive with a 5V threshold for good EMI immunity and that gives us ability to directly replace silicon,” said Dries.

The move to a trench process is key for a smaller die. “Because of the die shrink we can be cost competitive with silicon superjunction,” he said. “That’s a $1bn business that we are compatible with, with SiC performance, for the same price as [silicon] MOSFETs.” Pricing ranges from $3.57 for the 18mO RDS(on) version to $7.20 for the 60mO version.

This also competes with gallium nitride, he says. ““Our die size is a fraction of GaN lateral devices so we will go head to head on price performance against GaN,” he

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