WMJ90N60C4 MOSFET for Avalon 1246 Miner 3300W Power Supply Repair

WMJ90N60C4 N-Channel Power MOSFET | 650V / 0.024Ω TO-247 Charge-Balanced Super-Junction MOSFET with 100% UIS Testing for Avalon 1246 Miner 3300W Power Supply (PSU3300-03) Repair and High-Efficiency Switching Designs

The WMJ90N60C4 is a 650V N-channel power MOSFET in TO-247 package — the switching workhorse in the Avalon 1246 miner 3300W power supply (PSU3300-03). Drop-in replacement for failed primary switching MOSFETs during PSU repair, refurbishment, or production-line work.

Built around charge balancing (super-junction) technology for excellent power density and efficiency in high-voltage SMPS topologies. Combines low on-resistance and low gate charge performance — the trifecta that determines switching efficiency and thermal margin in high-power PSU primary stages. With a 650V VDD rating and typical RDS(on) of 0.024Ω, the WMJ90N60C4 minimizes conduction losses and maximizes power efficiency under sustained mining loads. 100% UIS (Unclamped Inductive Switching) tested at the factory — every device verified for avalanche ruggedness before shipment, the spec mining PSU repair shops need for reliable rework.

Typical Use in Avalon 1246 PSU Repair

• PSU3300-03 primary switching MOSFET failure — most common failure mode on 1246 PSU stacks.
• Hot-failure recovery — replacing MOSFETs after thermal runaway events.
• Cold-failure recovery — replacing degraded MOSFETs showing efficiency drop or shoot-through.
• Production refurb workflow — bulk MOSFET stock for line-based PSU rebuilds.
• General 650V SMPS design — LED lighting, chargers, adapters, server PSUs, LCD TV power.

WMJ90N60C4 MOSFET Specifications

FAQ — WMJ90N60C4 MOSFET

Q: Where exactly does the WMJ90N60C4 sit in the Avalon PSU3300-03 schematic?
A: Primary-side switching element in the half-bridge or full-bridge stage. Identify the failed device by part-number marking on the PCB silkscreen before ordering replacements — Avalon revisions can vary slightly in MOSFET selection between board revs.

Q: Can I substitute another 650V N-channel super-junction MOSFET?
A: Functionally yes — any 650V N-ch super-junction MOSFET with comparable RDS(on) (~0.024Ω) and matching TO-247 pinout works. However, the WMJ90N60C4's 100% UIS testing provides avalanche-ruggedness guarantees that generic substitutes may lack. For production-grade repair, stick with the original part.

Q: How do I diagnose a failed primary MOSFET?
A: Typical signs: PSU won't start, immediate over-current on power-on, blown input fuse, burn marks around the MOSFET. Test with multimeter diode mode (Vf across body diode) and resistance mode (D-S resistance). Visible cracking or carbonization on the package confirms catastrophic failure.

Q: Bulk pricing for PSU repair shops?
A: Yes — email contact@lys-sz.com with your monthly PSU repair volume for tier pricing on WMJ90N60C4 by the tube.

Related products

• 65R044MFD Super-Junction MOSFET TO-247 – Avalon 1346 PSU
• Avalon PSU3300-03 Plus 3300W
• NSR1020MW2T3G Schottky Diode – Avalon 1126/1246 Hashboard
• Avalon 1346/1326 Conductive Copper Strip – PSU3400

PSU repair shops stocking WMJ90N60C4 by the tube? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouses.