NTMFS4C09NT1G 4C09N N-Channel Power MOSFET for Avalon 3300-03 PSU
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NTMFS4C09NT1G 30V 52A N-Channel MOSFET – Secondary-Side Replacement for Avalon PSU3300-03
The NTMFS4C09NT1G (marking code 4C09N) is a 30 V / 52 A N-channel power MOSFET used on the secondary output stage of the Avalon PSU3300-03 power supply. Its low on-resistance minimises conduction losses while low input capacitance and optimised gate charge reduce switching losses — both essential for maintaining high efficiency in a PSU that delivers continuous power to Avalon 1246 and other Canaan mining rigs.
Common Failure Mode in the PSU3300-03
The secondary-side MOSFETs in the PSU3300-03 handle the full output current to the miner. Under sustained load, thermal fatigue or voltage transients from sudden hash-rate changes can degrade the MOSFET die. A failed unit typically results in the PSU delivering reduced or unstable output voltage, triggering miner restarts or refusing to start altogether. If the MOSFET shorts, it may blow the secondary-side fuse or cause visible burn marks on the PCB around the device.
Replacement Guide
Disconnect the PSU from mains and discharge all capacitors. Locate the 4C09N-marked MOSFET on the secondary-side output board. Desolder using a hot-air station at 320–350 °C, clean the pads, and install the new NTMFS4C09NT1G with correct drain/gate/source orientation per the board silkscreen. After soldering, confirm no pin bridges exist, then power the PSU on a variac and verify the output voltage reads within specification under a dummy load before connecting it to the miner.
NTMFS4C09NT1G MOSFET Specifications
| Parameter | Value |
|---|---|
| Type Designator | NTMFS4C09NT1G |
| Marking Code | 4C09N |
| Transistor Type | N-Channel MOSFET |
| Drain-Source Voltage (Vds) | 30V |
| Drain Current (Id) | 52A |
| Rds(on) | Low (minimises conduction losses) |
| Gate Charge | Optimised (minimises switching losses) |
| Capacitance | Low (minimises driver losses) |
| Compatible PSU | Avalon PSU3300-03 |
| Condition | New |
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