How do I start selecting a CR Micro device?

Fix the voltage class from your DC bus, size the current for the worst-case load, then choose between a Super Junction MOSFET, a SiC MOSFET and a SiC JBS diode for each position in the circuit. Finally pick the on-resistance or forward current and the package. Those decisions narrow the catalog quickly.

Super Junction MOSFET or SiC MOSFET?

Choose a Super Junction MOSFET for moderate-frequency, high-current conversion where conduction loss dominates and cost matters. Choose a SiC MOSFET when the converter runs at high frequency and switching loss would otherwise be prohibitive. The decision is frequency and efficiency versus cost.

Can BeiLuo help finalize my device choice?

Yes. Send your voltage, current, switching frequency and topology and we will propose a shortlist with loss, thermal resistance and stock status, then support design-in. Getting the device right saves project time.

What selection mistakes should I avoid?

The usual mistakes are sizing cooling from the 25 C on-resistance, ignoring the gate-loop layout and choosing a package that does not fit the PCB. Each adds cost or risk without benefit. Validate the choice on the bench before committing the BOM.

What gate drive does a CR Micro SiC MOSFET need?

The SiC family works with a standard +15 V / -5 V gate drive, so it is compatible with common gate drivers. The negative off-state supply improves robustness at high dv/dt and helps prevent false turn-on in a bridge. Keep the gate loop short and choose the gate resistor for your EMI target.

Why does loop inductance matter so much with SiC?

SiC switches fast, so the same parasitic inductance that a silicon design tolerates produces much higher overshoot and ringing. The gate loop and the power commutation loop are the two critical paths, and both must be kept short. A tight layout is the single biggest lever on overshoot and EMI.

How do I tune the gate resistor?

Start from the datasheet value, then increase the resistor in small steps until ringing and overshoot fall within your limits, and decrease it if switching loss is too high. Measure at the device terminals, not at the bus. Our FAE team can review your gate-drive design.

How do I handle the body diode?

The SiC MOSFET body diode freewheels, but for heavy duty a parallel SiC JBS diode reduces loss further, because it has no reverse-recovery charge. Match the diode current to the freewheeling current. Get a matched MOSFET and diode pairing.

My SiC diode fails at start-up. Where do I start?

Check the inrush and surge current against the diode's IFSM rating, then check the thermal path and the layout. A start-up failure is often a surge or a cold-solder or thermal-interface problem rather than a steady-state overload. Measure the surge current with a clamped probe during start-up.

Why is my diode running hot?

Forward conduction loss scales with the forward voltage times current, and the thermal path must remove it. Check the current, the forward voltage at temperature and the interface and heatsink. A thick or uneven interface is a frequent culprit. Use a thin, uniform interface and verify case temperature under load.

How do I parallel SiC diodes correctly?

The JBS diode has a positive temperature coefficient of forward voltage, so current sharing improves as one diode heats, which makes paralleling practical. Match the diodes, keep the layout symmetric so the inductances are equal, and verify sharing under load. Our FAE team can review your paralleling design.

Do I still need a snubber with a SiC diode?

A SiC JBS diode has no reverse-recovery charge, so it produces far less recovery noise than a silicon fast-recovery diode, and often no snubber is needed. Where ringing remains, it usually comes from the layout, so tighten the loop before adding a snubber. Layout is the first lever on EMI.

What is the standout feature of CR Micro SiC MOSFETs?

The lineup spans 650 V to 2200 V with on-resistance from about 10 milliohm, and the four-lead packages remove source inductance from the gate loop. That makes the fast switching manageable and raises efficiency in high-frequency converters. The main design care point is gate-loop layout.

Why does the four-lead package matter?

SiC switches fast, so source inductance in the gate loop causes ringing and slows the transition. A four-lead Kelvin-source package removes that inductance, which lets you switch faster with cleaner waveforms and less overshoot. It is one of the biggest practical improvements for SiC designs.

How should I size cooling for a SiC MOSFET?

Use the on-resistance hot value at your junction temperature to estimate conduction loss, add switching loss, and verify the thermal path from junction to ambient. Do not size cooling from the 25 C figure. Our FAE team can run the loss estimate for you.

Can I get samples to evaluate?

Yes. We provide samples of the SiC MOSFETs for your own efficiency and thermal testing, with documentation included and FAE support during bring-up. Request a sample and we will confirm stock and lead time.

Technical Support | CR Micro Expertise | BeiLuo

Guides, application notes, troubleshooting articles and reviews from BeiLuo's FAE team covering CR Micro Super Junction MOSFETs, SiC MOSFETs and SiC JBS diodes.

Guides 1 Application Notes 1 Troubleshooting 1 Reviews 1

How to Select a CR Micro MOSFET, SiC MOSFET or SiC Diode

2026-07-28 - Guides - By Wei Zhang

Compare CR Micro Super Junction MOSFETs, SiC MOSFETs and SiC JBS diodes by voltage class, current, on-resistance and package to choose the right device.

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CR Micro SiC MOSFET Application Notes: Gate Drive and Layout

2026-07-21 - Application Notes - By Wei Zhang

Gate-drive, loop-inductance and thermal guidance for designing high-frequency converters around CR Micro silicon carbide MOSFETs with clean switching.

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Troubleshooting CR Micro SiC JBS Diodes in High-Frequency Converters

2026-07-11 - Troubleshooting - By Li Chen

A systematic method for diagnosing surge events, thermal issues and paralleling problems in CR Micro SiC JBS diodes inside modern high-frequency converters.

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CR Micro SiC MOSFETs: A Practical Review

2026-06-30 - Reviews - By Hao Wang

A hands-on review of CR Micro silicon carbide MOSFETs for chargers, solar and storage, covering on-resistance, switching and four-lead package practice.

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Meet Our FAE Team

Wei Zhang

Senior FAE Engineer, Power Devices

Power MOSFETSiC MOSFETGate Drive

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Li Chen

FAE Engineer, SiC Rectifiers

SiC DiodePFCEMC

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Hao Wang

FAE Engineer, Applications

SiC MOSFETEfficiencyThermal

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