NTC10D25 Black Code: 20962491

The 10D25 (often designated as MF72-10D25) is a Power NTC (Negative Temperature Coefficient) Thermistor primarily used to suppress inrush current in electronic circuits. It features a nominal zero-power resistance of 10 Ω at 25°C, a 25 mm ceramic disk body, and a maximum steady-state current rating of 7A.

Key Specifications

• Zero-Power Resistance (R₂₅):10 Ω (with typically ±20% tolerance)
• Max Steady-State Current:7A (varies slightly by manufacturer, e.g., 7.5A)
• Body Diameter:25 mm
• Operating Temperature Range:-55°C to +200°C
• Thermal Dissipation Constant:≈ 25 mW/°C
• Thermal Time Constant:≈ 60 to 80 seconds

How It Works

When you first power on an electronic device (like a switching power supply or electric heater), it can pull a massive, damaging surge of electricity. The 10D25 is wired in series with the power circuit. Initially, it acts as a high-resistance barrier to choke the inrush current. As current continues to flow, the thermistor self-heats, causing its resistance to drop to nearly zero, thereby allowing normal operation with minimal power loss.

Typical Applications

• Switching Power Supplies (SMPS)
• UPS (Uninterruptible Power Supplies)
• Electric heaters and motor drives
• Electronic ballasts, filament protection, and energy-saving lamps