FNKS8N90K MOS Tube TO-252 for Antminer APW11 PSU Repair
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FNKS8N90K MOSFET in TO-252 Package | N-Channel 90V / 80A Replacement Part for Antminer Hydro APW11 PSU Repair
The FNKS8N90K is an N-channel MOSFET in TO-252 (DPAK) surface-mount package used on the Bitmain Antminer Hydro series APW11 power supplies. Direct replacement when an original device fails — quickly restores full power delivery to the hydro miner and avoids the cost of a complete PSU swap. The TO-252 package geometry matches the original PCB footprint exactly, so the replacement drops straight in without board-level rework beyond the desolder / resolder step.
Rated for 90V drain-source voltage and 80A continuous drain current, the FNKS8N90K sits in the secondary-side switching or output-stage positions on the APW11 board. When this device fails, the PSU loses voltage regulation, trips on overcurrent, or refuses to start altogether. Targeted component-level repair restores the unit at a fraction of the cost of full PSU replacement. SMD mounting requires professional soldering equipment (hot-air station or fine-tip iron with magnification).
When to Replace the FNKS8N90K
- APW11 PSU dead at startup — output MOSFET failed open or short, primary controller can't drive the output cleanly.
- Overcurrent trip on PSU startup — short across the MOSFET pulling the primary into protection.
- Output voltage drift outside the APW11 spec — degraded MOSFET on one phase, pulling regulation off.
- Visible burn marks on the device or its surrounding pads — immediate replacement, swap all parallel MOSFETs on the affected leg.
- Preventive PSU refurbishment — replace output MOSFETs alongside electrolytics during a complete APW11 rebuild.
FNKS8N90K MOSFET Specifications
| Parameter | Specification |
|---|---|
| Part Number | FNKS8N90K |
| Component Type | N-Channel power MOSFET |
| Drain-Source Voltage | 90V |
| Drain Current | 80A |
| Package | TO-252 (DPAK) |
| Mounting | Surface Mount (SMD) |
| Application | APW11 power supply repair |
| Compatibility | Bitmain Antminer Hydro series PSUs (APW11) |
| Replacement Type | Drop-in OEM equivalent |
| Condition | Brand New |
FAQ — FNKS8N90K MOSFET
Q: How do I confirm the FNKS8N90K is the failed component vs another part on the APW11?
A: Diode-test the suspect MOSFET in circuit with a multimeter — a healthy N-channel reads infinite drain-source resistance with the gate at zero. A short across drain-source confirms a dead part. Visual inspection catches the obvious burn cases.
Q: Should I replace all paralleled MOSFETs on the affected leg or just the dead one?
A: For best long-term reliability replace all parallel MOSFETs on the affected leg — the surviving parts have absorbed thermal stress from the failure event and have shortened service life. The cost difference is small versus a repeat failure 3-6 months later.
Q: What rework equipment do I need?
A: TO-252 / DPAK rework needs hot-air rework or a fine-tip iron with the right tip. Standard equipment for any modern PSU repair bench. Clean the pads carefully before placing the new device.
Q: Bulk pricing for repair shops?
A: Yes — email contact@lys-sz.com with your monthly volume. Reel and tray quantities are stocked.
Related products
Repair shops stocking FNKS8N90K MOSFETs by the reel? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouse.
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