NTC 16D-20 5A 16Ohm 20% 20mm Thermistor Power Supply Unit repair

NTC 16D-20 Thermistor 16Ω 5A – Mining PSU Inrush Current Protection

The NTC 16D-20 is a negative temperature coefficient thermistor with a cold resistance of 16Ω, rated at 5A, in a 20mm through-hole disc package with ±20% tolerance. It serves as an inrush current limiter on the AC input stage of mining power supplies — at power-on, the 16Ω resistance limits the surge into the bulk capacitors, then self-heats and drops to near-zero resistance for normal operation. RoHS compliant, operating range -20°C to +150°C.

Why NTC Thermistors Fail in Mining PSUs

Every power-on cycle forces the NTC to absorb inrush energy. In mining environments with frequent cycling — maintenance, outages, rolling restarts — the cumulative stress degrades the device. A failed NTC either cracks open (PSU won't start) or shorts (no inrush protection, stressing the bridge rectifier and bulk caps). Replacing a failed NTC is a low-cost repair that prevents cascading damage to more expensive downstream components.

Replacement Procedure

Disconnect mains and discharge bulk capacitors. Locate the NTC on the input filter board near the AC inlet — a large disc with two radial leads. Desolder both leads, remove, install the new NTC 16D-20 through the same holes. Solder, trim leads, reassemble and verify normal startup with controlled inrush.

NTC 16D-20 Thermistor Specifications

Related NTC Thermistors & PSU Protection Components

• NTC 20D-20 Power Thermistor 20Ω 250W
• MF72 10D15 NTC Thermistor – APW3 PSU
• NTC 5D-15 Thermistor – PSU Repair
• NTC 8D-20 Thermistor – Innosilicon / Whatsminer PSU

Repairing mining PSU input stages? Contact us at contact@lys-sz.com for NTC thermistors and protection components.

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