TPW65R040M 650V N-Channel MOSFET for Avalon PSU3400-03
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TPW65R040M 650V N-Channel Super-Junction MOSFET | High-Efficiency Replacement for Avalon PSU3400-03 Repair
The TPW65R040M is a 650V N-channel super-junction power MOSFET used as a high-efficiency replacement on the Avalon 1346 power supply PSU3400-03. Super-junction technology delivers low RDS(on) at high breakdown voltage, restoring proper switching performance and stable power delivery in Avalon PSU systems under continuous mining duty.
Headline specs: 650V VDS, 72A continuous ID, 35mΩ RDS(on) at VGS=10V, 500W power dissipation, -55°C to +150°C junction temperature. Low gate charge (160nC at 10V) and reverse transfer capacitance (3.3pF at 100V) keep switching losses low at the high frequencies of the PSU3400's primary stage.
When to Replace the TPW65R040M
- PSU no output — primary-side switching MOSFET open or shorted.
- Blown mains fuse — shorted MOSFET took out the input fuse on power-up.
- Repeating over-current protection trip — degraded MOSFET causing controller to retry-and-fault.
- Visible cracking on the TO-247 body — overheat damage from cooling-fan failure or sustained over-temperature.
- Adjacent gate driver also failed — voltage spike from a shorting MOSFET often kills the driver too.
TPW65R040M Specifications
| Parameter | Specification |
|---|---|
| Part Number | TPW65R040M |
| Type | N-Channel Super-Junction Power MOSFET |
| Drain-Source Voltage (VDSS) | 650V |
| Continuous Drain Current (ID) | 72A |
| Drain-Source On Resistance RDS(on) | 35mΩ at VGS=10V, ID=25A |
| Power Dissipation (Pd) | 500W |
| Gate Threshold Voltage Vgs(th) | 4.5V at 250µA |
| Reverse Transfer Capacitance (Crss) | 3.3pF at 100V |
| Input Capacitance (Ciss) | 7.565nF at 100V |
| Total Gate Charge (Qg) | 160nC at 10V |
| Operating Temperature (Tj) | -55°C to +150°C |
| Compatible PSU | Avalon 1346 PSU3400-03 |
FAQ — TPW65R040M Super-Junction MOSFET
Q: Should I replace the TPW65R040M in pairs on the bridge?
A: Yes — when the PSU uses a bridge or half-bridge topology, replace in matched pairs or complete sets to maintain balanced switching behavior. A single new MOSFET paired with an aged partner mismatches switching characteristics and stresses both devices.
Q: Always check the gate driver IC when this MOSFET dies?
A: Strongly recommended. The voltage spike from a shorting MOSFET often kills the driver in the same event. Replacing only the MOSFET and leaving an aged driver is a common cause of repeat failure within hours.
Q: How do I verify the PSU is healthy after the swap?
A: Dummy-load the PSU at 50% and 100% of rated power for at least 15 minutes before returning it to service. Watch new-MOSFET temperatures with a thermal camera or thermocouple to confirm acceptable junction temps.
Q: Bulk pricing for Avalon PSU repair benches?
A: Yes — email contact@lys-sz.com for tape-and-reel quantities and matched gate-driver kits.
Related products
- Avalon PSU3400-03 (A1346 / A1366)
- UCC28C45DR PWM Controller (Avalon A1346 PSU)
- MUR860F Ultrafast Recovery Diode (Avalon PSU3400)
- GP47S60X MOSFET TO-247 (Miner PSU Primary Stage)
Avalon PSU3400 repair benches stocking TPW65R040M in tape-and-reel volume? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouse.
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