Why Review CR Micro SiC

CR Micro is an integrated device maker with a broad power portfolio, and its silicon carbide MOSFET line covers an unusually wide voltage range, from 650 V to 2200 V. The datasheet promises low on-resistance and clean fast switching, but the datasheet only tells part of the story. This review examines the CR Micro SiC MOSFETs from the perspective of an FAE who supports customers through design-in and bring-up, focusing on on-resistance, switching behavior, packaging and practical layout.

On-Resistance and Range

The standout feature of the CR Micro SiC line is its range. The 750 V family reaches about 10 milliohm in the QDPAK and TOLL packages, the 1200 V family offers 17 milliohm in the four-lead TO-247-4, and the line extends up to 2200 V for high-voltage applications. That breadth lets a designer choose the voltage class and on-resistance that fit the application rather than compromising. On evaluation hardware, the measured conduction loss tracked the datasheet, confirming that a thermal-aware estimate is reliable. Remember that on-resistance rises with temperature, so the hot value, not the 25 C figure, sets the cooling.

Switching Behavior

SiC has no tail current, so the turn-off transition is clean and switching loss is low. That enables higher switching frequency, which shrinks magnetics and improves power density. The trade-off is that fast switching excites parasitic inductance, so gate-loop and commutation-loop layout dominate ringing and overshoot. Keeping loops short and tuning the gate resistor are the main levers, and the results are excellent once the layout is right.

Packaging and the Kelvin Source

CR Micro offers its SiC MOSFETs in a wide range of packages, from the surface-mount QDPAK and TOLL to the classic TO-247 and the four-lead TO-247-4. The four-lead arrangement removes source inductance from the gate loop, which is a genuine advantage for SiC because that inductance is what turns fast switching into ringing. In our tests, the four-lead part produced noticeably cleaner gate waveforms and lower overshoot than a comparable three-lead device at the same gate resistance. For a designer new to SiC, choosing a Kelvin-source package is one of the simplest ways to get a stable design.

Surface-Mount for Density

The QDPAK and TOLL packages suit a compact, high-frequency board where the thermal path runs through the PCB copper and thermal vias. They trade the convenience of a screw-mounted heatsink for a smaller footprint and lower loop inductance, which matters in charger and server-power designs.

Applications

The CR Micro SiC MOSFETs fit high-frequency, high-efficiency converters: on-board chargers, EV charging stages, solar inverters, energy-storage converters and server power supplies. In these applications, the combination of low on-resistance and low switching loss raises efficiency and lets the magnetics shrink, which improves power density. Where cost is the dominant constraint and the frequency is modest, a Super Junction silicon MOSFET remains the economical choice.

Solar, Storage and Server Power

In a solar inverter, SiC in the boost stage raises the MPPT switching frequency, shrinking the boost inductor and improving tracking. In storage converters that run in both directions, SiC keeps loss low across the whole operating range, which raises round-trip efficiency. In a server power supply, the same efficiency and density gains allow more compute in a fixed rack space.

Layout Practice

CR Micro SiC MOSFETs reward a disciplined layout. Keep the DC-link capacitor close to the device with a low-inductance connection, size the gate resistor to control the edges within the EMI budget, and measure overshoot at the device terminals rather than at the bus. Because the device switches faster than silicon, the commutation loop matters more, not less. In our tests, a tight loop and a moderate gate resistor produced clean waveforms with comfortable margin.

Conclusion

The CR Micro SiC MOSFETs deliver on their promises: a broad voltage range, low on-resistance, clean fast switching and Kelvin-source packages that make the fast switching manageable. In our evaluation they were straightforward to design in and reliable on the bench. For new high-frequency, high-efficiency converters, they deserve to be on the shortlist, and BeiLuo's authorized stock and FAE support make evaluation easy.