SI7N65F 650V 7A N-channel MOSFET for Antminer APW17 / APW12 PSU Repair
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SI7N65F 650V N-channel MOSFET – Antminer APW17 / APW12 PSU Repair
The SI7N65F 650 V 7 A N-channel MOSFET is a high-performance replacement switching transistor used in the main power stage of Bitmain Antminer APW17 and APW12 power supplies. Built with a modern charge-balanced superjunction structure, it offers low on-resistance, low gate charge and high avalanche energy — exactly what an ASIC miner PSU demands under continuous high-current switching. When a failed SI7N65F blows a PSU into protection or a no-output fault, dropping in a genuine SI7N65F on the original footprint restores normal operation at a fraction of the cost of a new PSU.
SI7N65F MOSFET Key Features
- High voltage tolerance — supports up to 650 V for reliable high-power PSU operation.
- Excellent switching performance — low on-resistance and minimal gate charge, reducing conduction and switching losses.
- High avalanche energy — withstands extreme dv/dt rates, stable under high-current switching transients.
- Robust thermal performance — rated for junction temperatures up to 150 °C.
- Ideal for PSU repair — specifically compatible with Antminer APW17 and APW12 PSUs.
SI7N65F Technical Specifications
| Feature | Specification |
|---|---|
| Model | SI7N65F |
| Transistor Type | N-channel MOSFET |
| Package | TO-220F |
| Maximum Power Consumption | 30 W |
| Maximum Drain-Source Voltage (Vds) | 650 V |
| Maximum Gate-Source Voltage (Vgs) | 30 V |
| Maximum Gate Threshold Voltage | 4 V |
| Maximum Drain Current (Id) | 7 A |
| Maximum Junction Temperature (Tj) | 150 °C |
| Total Gate Charge (Qg) | 41 nC |
| Rise Time | 12 ns |
| Output Capacitance (Coss) | 130 pF |
| Maximum Rds(on) | 1.27 Ω |
| Compatible PSUs | Antminer APW17, APW12 |
| Weight | 3 g |
| Condition | Brand New |
Diagnosing SI7N65F Failure on APW17 / APW12
When a SI7N65F fails on an APW17 or APW12, typical symptoms are: PSU not powering on, PSU clicking into protection immediately after start, no 12 V rail output, burned or discoloured MOSFET body on the main power stage, or blown input fuse. Confirm the failure with an in-circuit diode test between drain, source and gate before rework. After replacement, always check the gate driver IC and the associated input-side capacitors — a dead MOSFET often takes upstream components with it.
Why Use the SI7N65F over Generic 650V MOSFETs
Generic 650 V MOSFETs may fit the pad pattern but often fail under APW17 / APW12 hard-switching conditions because of lower avalanche energy or slower gate switching. The SI7N65F is the part Bitmain specified for these PSUs; matching on-resistance, gate charge and thermal behaviour means the repaired PSU runs with the same efficiency and the same thermal envelope as factory-new.
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Rebuild your APW17 / APW12 to factory spec with a genuine SI7N65F. Order online or contact us at contact@lys-sz.com for tray-quantity pricing and repair-shop bulk orders. Worldwide shipping from our Shenzhen warehouse.
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