NTC10D-9 Thermistor

NTC10D-9 Thermistor

10D‑9 NTC Thermistor (also sold under similar listings like 10D‑9 NTC Thermistor by Quartz Components, NTC Thermistor Resistors 10D‑9 2A 10 Ohm Inrush Current Limiter, etc.) is a negative temperature coefficient (NTC) thermistor. NTC thermistors are resistive components whose resistance decreases as temperature increases.

Key Specs (Typical for NTC10D-9)

• Resistance at 25 °C: ~10 Ω — the “10” in 10D-9 means ~10 ohms at room temperature.
• Diameter: ~9 mm disk (the “D-9” in the part number).
• Steady-State Current: ~2 A typical at 25 °C.
• Approx. Resistance at full current: ~0.46 Ω under load.
• Thermal time constant: ~30-35 s.
• Operating Temperature Range: roughly –40 °C to +175 °C / –55 °C to +200 °C (varies slightly by source).
• Tolerance: often ±20 % (but specific versions may have tighter tolerances).

🔌 How NTC10D-9 Thermistor Works

This component is used in series with a power line to limit inrush current when equipment first turns on. When cold, its resistance is high — which limits surge current. As current flows and it heats up, its resistance drops, allowing normal current flow with minimal loss.

Applications

• Inrush current limiting in SMPS (switch-mode power supplies) or other power electronics.
• Protecting circuits in monitors, TVs, appliances, and motors.
• Used in ballasts, UPS systems, and energy-saving lamps.