SiC Semiconductor Selection: What B2B Buyers Should Verify Before Design-In

Silicon carbide changes the loss equation in one specific place, and that is where a buyer should look first. A 650 V, 10 A…

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SiC Semiconductor Selection: What B2B Buyers Should Verify Before Design-In

Silicon carbide changes the loss equation in one specific place, and that is where a buyer should look first. A 650 V, 10 A SiC Schottky diode is specified with no reverse recovery charge across the application current range, switching behaviour that does not move with temperature, a 175 °C junction limit and a high forward surge capability — four claims that each correspond to a document worth requesting before design-in.

Last updated: October 11, 2026

Key Takeaways

The SiC Schottky junction earns its place by removing recovery loss: no reverse recovery charge means the diode contributes nothing to the switch’s turn-on loss in a hard-switched stage.
Its switching behaviour is specified as independent of temperature, which matters because the equivalent silicon device’s recovery grows as the junction heats.
The higher junction temperature is a rating, not a free pass: it still has to be reached through the package and the board.
Package options change the assembly: an insulated TO-220AC version carries a 2500 V RMS insulating voltage and a 7 pF typical package capacitance.
What to verify before design-in: the datasheet for the exact part, avalanche and surge behaviour, thermal impedance curves, package drawings, and the qualification evidence for the target market.

What a SiC Diode Actually Specifies

Start from the four claims that distinguish the part, because each one is checkable. The STMicroelectronics STPSC10H065 is a 650 V, 10 A SiC power Schottky diode, offered in TO-220AC, TO-220AC insulated, D²PAK and DPAK outlines, and intended for switch-mode supplies, power-factor correction, DC-DC converters, LLC topologies and boost-diode duty.

Published claim	What the datasheet states	What it means for the design
No recovery in the application range	No reverse recovery charge across the application current range; ringing patterns described as negligible	The diode adds nothing to the switch’s turn-on loss, and the loop needs less damping
Stable switching with temperature	Switching behaviour independent of temperature	Loss estimates made at 25 °C stay valid at operating temperature
Surge robustness	High forward surge capability	Covers the inrush and fault conditions the stage can present
Headroom	650 V repetitive peak reverse voltage; 175 °C maximum junction temperature	A higher rail class and more thermal headroom than the equivalent silicon part
Isolation option	Insulated TO-220AC: 2500 V RMS insulating voltage, 7 pF typical package capacitance	Direct mounting on a shared heatsink, at the cost of a little package capacitance

The Part That Changes the Loss Equation

In a hard-switched stage the diode’s recovery current is not the diode’s problem; it is the switch’s. When a silicon p-n or fast-recovery diode turns off, the charge that has to be removed flows as a reverse current pulse, and that pulse adds to the current the switch must commutate. The result is extra turn-on loss in the switch — often more than the diode’s own conduction loss — and a current edge that excites the loop’s parasitic inductance.

A SiC Schottky removes that term. With no stored minority charge, the turn-off produces essentially only the displacement current of the junction capacitance, which the datasheet describes as minimal and independent of temperature. That is the whole argument for the part in a power-factor-correction boost or an LLC stage: the loss budget improves where the losses are hardest to remove, and the EMI behaviour can be easier because there is no fast recovery edge to damp.

Two boundary conditions belong with that argument. The first is that a SiC diode still has a forward drop and a junction temperature, so the thermal path — package, insulation, mounting interface — still decides the usable current. The second is that the absence of recovery does not remove the need to check the switch’s own behaviour; it removes one term from the calculation, not the calculation.

What B2B Buyers Should Verify Before Design-In

Convert the supplier’s positioning into a list of documents, and request them by name.

Datasheet for the exact part and package, including the reverse-recovery and capacitance statements that justify the choice.
Surge and avalanche behaviour with the test conditions, so inrush and fault tolerance can be checked rather than assumed.
Thermal impedance curves for the package you will use, not just the steady-state thermal resistance, because switching loss is a pulsed quantity.
Package and outline drawing, including the creepage the application needs and, for insulated versions, the insulating voltage and package capacitance.
Qualification evidence for the target market — automotive programmes need the AEC-Q101 route for the exact part and package.
Lifecycle and second-source position, because a wide-bandgap part in a long-lived platform will outlast several product generations.

Where a supplier can provide those documents, the selection is reviewable. Where a figure is missing, the honest entry in the design file is that it is unavailable or available on request — never an assumed value.

FAQ

What is different about a SiC diode compared with a silicon Schottky?

The blocking voltage and the temperature capability. A silicon Schottky in this size class typically tops out far below 600 V; the wide-bandgap material supports a 650 V rating while keeping the Schottky behaviour of no minority-carrier recovery.

Does the absence of recovery charge mean lower loss everywhere?

It removes the recovery term and the switch’s associated turn-on loss, which is where the largest gain usually is. Conduction loss still depends on the forward drop at your current, and thermal design still sets the usable current.

Why does an insulated package matter?

It allows the device to be mounted directly on a shared heatsink without an insulating pad. In the example part the package carries a 2500 V RMS insulating voltage and about 7 pF of package capacitance.

What should be checked about the packaging before layout?

The outline drawing for creepage and mounting, the thermal impedance the package can achieve with your copper or heatsink, and whether the isolated variant is needed. Those three decide the layout more often than the electrical ratings do.

What replaces a SiC diode if supply becomes a problem?

A silicon fast-recovery diode can be a temporary engineering substitute, but its recovery grows with current and temperature, so the switch’s turn-on loss and the loop’s EMI behaviour have to be re-checked. A second SiC source, with its own qualification, is the cleaner answer.

Official Resources

References

STMicroelectronics, STPSC10H065 — 650 V, 10 A high surge silicon carbide power Schottky diode, DS9226 Rev 8 — source of the 650 V and 10 A ratings, the 175 °C maximum junction temperature, the statement of no reverse recovery charge across the application current range, the temperature-independent switching behaviour, the high forward surge capability, and the TO-220AC, insulated TO-220AC (2500 V RMS, 7 pF typical package capacitance), D²PAK and DPAK package options. st.com — STPSC10H065 datasheet (PDF)
STMicroelectronics, STPSC8H065 — 650 V, 8 A silicon carbide power Schottky diode — the smaller member of the same family, used to confirm the voltage class and package spread. st.com — STPSC8H065 datasheet (PDF)
AEC-Q101 — stress test qualification for discrete semiconductors (standard designation; documents are distributed by the Automotive Electronics Council).

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