UF4005 US1J 1A 600V Rectifier Diode SMA for Antminer repair
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UF4005 / US1J Ultrafast Rectifier Diode | 1A / 600V SMA Replacement for Antminer Hashboard & PSU Repair
The UF4005 (US1J) is a 1A / 600V ultrafast-recovery rectifier diode in a DO-214AC (SMA) surface-mount package. Used across Antminer hashboard and PSU rework for high-voltage rectification, snubber networks, and freewheeling paths where standard slow-recovery diodes overheat at the switching frequencies typical of crypto miner power conversion.
Headline numbers: 600V max reverse voltage, 1A average rectified current, 1.7V forward drop at 1A, 75ns reverse recovery time, and 17pF capacitance at 4V/1MHz. Junction temperature spans -65°C to +150°C, covering the realistic ASIC repair envelope. SMA package is the standard SMD outline — wide compatibility across boards using the UF400-series footprint.
When to Replace the UF4005
- Local rail dead on a hashboard — rectifier diode shorted or open after a transient event.
- Excessive heat on the diode body at normal load — degraded junction, forward drop climbing.
- Visible damage on the DO-214AC package — cracking or blackening after a high-voltage fault.
- Snubber network ringing climbing on scope — diode no longer absorbing the switching transient cleanly.
- Adjacent components also damaged — replace surrounding caps / MOSFETs together to avoid repeat failure.
UF4005 / US1J Specifications
| Feature | Specification |
|---|---|
| Part Number | UF4005 (US1J equivalent) |
| Diode Type | Ultrafast-recovery rectifier |
| Max Reverse Voltage (Vr) | 600V |
| Average Rectified Current (Io) | 1A |
| Forward Voltage (Vf) Max | 1.7V @ 1A |
| Speed | Fast recovery ≤ 500ns @ >200mA Io |
| Reverse Recovery Time (trr) | 75ns |
| Reverse Leakage @ Vr | 10µA @ 600V |
| Capacitance @ Vr, F | 17pF @ 4V, 1MHz |
| Junction Operating Temp | -65°C to +150°C |
| Package | DO-214AC (SMA, surface mount) |
| Compatible With | Antminer hashboard / PSU UF400-series footprints |
| Condition | Brand New |
FAQ — UF4005 / US1J Rectifier
Q: How do I identify the UF4005 on the board?
A: Silk marking US1J on the DO-214AC package is the abbreviated marking for the UF4005 die. Some boards may also use UF4005 directly. Both markings refer to the same part — 1A / 600V ultrafast-recovery rectifier in SMA outline.
Q: How do I test the diode in-circuit?
A: Power off. DMM diode-test mode across the diode leads. Healthy reads ~1.5–1.7V forward, OL reverse. Shorted reads 0Ω both directions. Open reads OL both directions. The relatively high Vf (1.7V vs ~0.5V for Schottky) is normal for ultrafast silicon rectifiers — don't confuse "high reading" with "failed".
Q: Substitute a faster Schottky for lower Vf?
A: Not at 600V. Schottky breakdown voltage tops out around 200V in practical SMD packages. The UF4005 occupies the 400V–600V window specifically because Schottky isn't available there. Stick with the ultrafast silicon for these high-voltage rails.
Q: Bulk pricing for repair benches?
A: Yes — email contact@lys-sz.com for reel-quantity UF4005 / US1J pricing.
Related products
- MUR860F Ultrafast Recovery Diode (Avalon PSU3400)
- L3D06065P 650V/6A Schottky (Whatsminer M10 PSU)
- DSK24 2A 40V Schottky (Antminer S19j Pro / S19 XP / S21)
- B0540W SF 40V/500mA Schottky (Antminer L7 / S19j Pro+)
Hashboard / PSU repair benches stocking UF4005 rectifiers by the reel? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouse.
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