UJ4C075044K4S 750V SiC MOSFET for Antminer APW17 PSU Repair
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UJ4C075044K4S 750V SiC Power MOSFET | TO-247-4 Repair Part for Antminer APW17 PSU
The UJ4C075044K4S is a 750V N-Channel SiC (silicon carbide) power MOSFET in the TO-247-4 four-lead package — the primary-side switching MOSFET on the Antminer APW17 power supply. SiC MOSFETs deliver lower switching losses and higher operating-temperature margin than equivalent silicon parts, making them the workhorse switching element on high-density ASIC PSU designs.
Headline specs: VDS 750V, RDS(on) typical 44mΩ, Qg 37.8nC, Qrr 72nC, body diode VFSD 1.2V, gate drive range 0-15V, junction temperature up to 175°C. ESD protection HBM Class 2, CDM Class C3.
When to Replace the UJ4C075044K4S
- APW17 PSU fails to start — no DC output, no transformer startup tick.
- Hiccup mode — PSU pulses on/off repeatedly without latching to full operation.
- Burnt or visibly damaged TO-247-4 on the primary-side heatsink.
- Multimeter diode-test shows shorted drain-source.
UJ4C075044K4S Specifications
| Parameter | Specification |
|---|---|
| Device Type | N-Channel SiC Power MOSFET (Gen 4) |
| Package | TO-247-4 (4-lead, Kelvin source) |
| VDS (Drain-Source Voltage) | 750V |
| RDS(on) | 44mΩ typical |
| QG (Gate Charge) | 37.8nC |
| Qrr (Reverse Recovery Charge) | 72nC |
| VFSD (Body Diode Forward Voltage) | 1.2V |
| Gate Drive Range | 0-15V |
| Maximum Junction Temperature | 175°C |
| ESD Protection | HBM Class 2, CDM Class C3 |
| Application | Antminer APW17 PSU primary switching |
FAQ — UJ4C075044K4S SiC MOSFET
Q: Why TO-247-4 instead of standard TO-247-3?
A: The 4-lead TO-247-4 adds a Kelvin source connection — a dedicated source-sense pin separate from the power source. This reduces switching losses by isolating the gate-drive return path from the high-current source path. Standard TO-247-3 won't drop into this footprint.
Q: SiC vs silicon MOSFET — does it matter?
A: Yes — SiC has lower switching losses and tolerates higher junction temperatures than silicon. The APW17 PSU design relies on SiC's specific characteristics; substituting a silicon MOSFET at this position will increase switching loss and trip overtemperature protection under load.
Q: Rework profile?
A: Through-hole TO-247-4 rework — desolder 4 leads with a vacuum pump, lift the part, install fresh device with correct pin orientation, apply fresh thermal compound to the tab, torque to heatsink.
Q: Bulk pricing?
A: Yes — email contact@lys-sz.com for tray-quantity pricing.
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Antminer APW17 PSU repair benches stocking UJ4C075044K4S MOSFETs in volume? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouse.
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