CVFD20065A Schottky Diode for Whatsminer P21D Power Supply Repair

CVFD20065A 650V 26A Silicon Carbide Schottky Diode | Whatsminer P21D PSU Repair

The CVFD20065A is a Wolfspeed (Cree) Z-Rec® 650V silicon carbide (SiC) Schottky rectifier diode in the TO-220-2 package — the secondary-side rectifier diode used on the Whatsminer P21D power supply. SiC Schottky diodes are the standard for high-frequency, high-efficiency PSU rectification: forward voltage drop VF max 1.45V @ 20A, near-zero reverse recovery, and excellent thermal behavior — all critical in a continuously-running ASIC PSU where every watt of conversion loss becomes board heat.

Sourcing note: the CVFD20065A is officially obsolete at Wolfspeed (production discontinued) and no longer manufactured. We carry available stock specifically for P21D PSU repair where the original part needs an exact OEM-match replacement; once current inventory clears, customers will need to pivot to a Wolfspeed pin-compatible substitute (Wolfspeed C3D20065D / C3D20065D1 series).

The CVFD20065A features zero forward and reverse recovery voltage, temperature-independent switching behavior, and extremely fast switching times. Its positive temperature coefficient on VF means devices can be paralleled without thermal runaway — a useful property when the P21D PSU design uses multiple rectifiers in parallel on the output stage.

When to Replace the CVFD20065A in a P21D PSU

• PSU produces no output while AC input is present — secondary-side rectifier shorted.
• PSU output rail droops under load — degraded diode with elevated VF.
• Visible damage on the TO-220 body — cracked package, burnt leads, lifted tab.
• Diode-test shows open or shorted junction on the multimeter — either failure mode.
• Excessive heatsink temperature on the rectifier section during light-load operation — sign of elevated conduction loss.

Specs and Technical Features

• 650V Schottky rectifier — covers the secondary-side voltage envelope on Whatsminer P21D PSU.
• 26A continuous current rating — full headroom for ASIC PSU output rectification.
• TO-220-2 package — standard heatsink-mounted footprint, direct fit for P21D PSU layout.
• Reduced forward voltage drop (VF) — lower conduction loss than equivalent silicon diodes.
• Zero reverse recovery — eliminates switching loss at PSU operating frequencies.
• Extremely fast switching — temperature-independent switching behavior.
• Positive temperature coefficient on VF — supports parallel device operation without thermal runaway.
• High humidity resistance — stable performance in challenging mining-farm environments.

CVFD20065A SiC Schottky Diode Specifications

FAQ — CVFD20065A SiC Schottky Diode

Q: SiC Schottky vs silicon Schottky vs ultrafast — what's the difference for PSU repair?
A: SiC Schottky diodes have lower VF and zero reverse recovery vs silicon equivalents — meaning lower conduction loss AND lower switching loss at the same time. Ultrafast silicon rectifiers have fast switching but higher VF. For modern ASIC PSU repair, SiC is the right call when the original part is SiC.

Q: Can I substitute a different SiC Schottky with 650V/26A rating?
A: Yes — Wolfspeed's pin-compatible C3D20065D family (TO-220-2 or TO-247-3 variants) is the natural drop-in successor since the CVFD20065A is officially obsolete. Verify package (TO-220-2 vs TO-247-3), lead arrangement, and IFSM rating all match before placing the part.

Q: Does the diode need a heatsink?
A: Yes — the TO-220-2 package mounts to a heatsink on the P21D PSU. Apply fresh thermal compound (paste or thermal pad) when installing the replacement diode and torque the mounting screw to spec.

Q: How do I test the diode in-circuit?
A: Power off the PSU, discharge bulk capacitors, then use a multimeter in diode-test mode. A healthy SiC Schottky shows ~0.9-1.3V forward drop and OL in reverse. A shorted diode shows ~0V both directions; an open diode shows OL both directions.

Q: Bulk pricing for repair shops?
A: Yes — email contact@lys-sz.com for tray-quantity pricing.

Related products

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• 2200µF 25V Aluminum Electrolytic Capacitor (Whatsminer PSU)
• CHZ02-S-112LA2 Power Relay (Whatsminer P221C / P222C)

Repair benches stocking CVFD20065A SiC Schottky diodes for P21D PSU rebuilds in volume? Email contact@lys-sz.com for bulk pricing and matched PSU repair kits. Worldwide shipping from our Shenzhen warehouse.