NTC 5D-15 Circuit Protection Power Thermistor 5ohms 15mm PSU Bitmain
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NTC 5D-15 Power Thermistor 5Ω – Bitmain APW3 PSU Inrush Limiter
The NTC 5D-15 is a 5 Ω cold-resistance, 15 mm diameter power thermistor with a negative temperature coefficient, sized for Bitmain APW3 PSU inrush-current limiting. Wide operating temperature range delivers accurate monitoring + control of switch-on surge events; fast response time + low hysteresis enable efficient thermal management on the AC input side of the PSU.
The NTC sits in the mains input path: cold thermistor presents 5 Ω, capping the inrush surge into the bulk capacitors at switch-on. Once current flows, the thermistor self-heats and resistance drops — removing itself from the loss equation during steady-state operation.
Typical Failure Modes Solved
- APW3 PSU blows input fuse on power-up — failed-open thermistor allows full inrush surge.
- Stuck-high resistance — chip not warming under load; PSU runs lossy / hot.
- Cracked / scorched ceramic body — sustained over-current event damage.
- Production refurbishment — bulk thermistor stock for APW3 rebuild lines.
NTC 5D-15 Specifications
| Feature | Specification |
|---|---|
| Part Number | NTC 5D-15 |
| Type | Circuit protection power thermistor |
| Cold Resistance | 5 Ω |
| Diameter | 15 mm |
| Temperature Coefficient | Negative (NTC) |
| Response Time | Fast |
| Hysteresis | Low |
| Use Case | Bitmain APW3 PSU mains input inrush limiting |
| Condition | Brand New |
FAQ — NTC 5D-15 Thermistor
Q: How to spot a failed inrush thermistor?
A: Visual: cracked or scorched ceramic body. Electrical: open-circuit on the multimeter, or stuck close to cold value after the PSU has been running.
Q: 5D-15 vs 5D-11 — same thing?
A: Both 5 Ω cold resistance, different diameter / current rating. 15 mm handles higher steady-state current. Match the original part footprint for APW3 repair.
Q: Bulk pricing?
A: Yes — email contact@lys-sz.com.
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APW3 rebuild shops stocking NTC 5D-15? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouses.
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