10D-9 Negative Temperature Coefficient Thermistor

10D-9 Negative Temperature Coefficient Thermistor serves as a reliable power protection component designed to suppress high inrush currents in electronic circuits. This NTC thermistor exhibits a high resistance at room temperature, which effectively limits the initial surge of current when you first power on a device. Consequently, as the device operates, the flowing current heats the thermistor, causing its resistance to drop significantly to a negligible level. This characteristic ensures that your power supply and sensitive components remain safe from electrical stress during start-up. Furthermore, the 10D-9 model offers a compact form factor, making it an ideal choice for space-constrained power conversion designs. Therefore, you should integrate this thermistor into your hardware to improve the overall longevity and reliability of your electronic systems.

Key Features:

• High Inrush Current Suppression: Effectively limits the initial current spike to protect fuses, bridge rectifiers, and filter capacitors.
• Low Residual Resistance: Minimizes power loss during steady-state operation once the device reaches its operating temperature.
• Wide Operating Temperature: Performs reliably across a broad range of thermal environments, making it suitable for industrial use.
• High Thermal Stability: Features a robust ceramic body that handles repetitive heating and cooling cycles without degradation.
• Cost-Effective Protection: Provides a simple and inexpensive alternative to complex active soft-start circuits.

Technical Specifications:

• Zero Power Resistance (R25): 10 Ω ±20% (measured at 25°C)
• Maximum Steady State Current: 2.0 A
• Approximate Resistance at Max Current: 0.455 Ω
• Thermal Dissipation Constant: ≈ 11 mW/°C
• Thermal Time Constant: ≤ 45 seconds
• Operating Temperature Range: −55°C to +155°C
• B-Constant: ≈ 2800K

Mechanical Specifications:

• Body Coating: Black Silicone or Phenolic Resin (Flame Retardant)
• Lead Type: Radial Lead (Through-Hole)
• Lead Material: Tinned Copper Wire
• Durability: Excellent resistance to mechanical vibration and thermal shock.

Dimensions:

• Disc Diameter (D): ≈ 9.0 mm
• Body Thickness (T): ≈ 4.0 mm to 5.0 mm
• Lead Pitch (F): ≈ 5.0 mm (±0.8 mm)
• Lead Diameter: ≈ 0.6 mm
• Lead Length: ≥ 25 mm

Pinout and Wiring:

• Polarity: This component is non-polarized, meaning you can install it in either direction.
• Series Connection: Always wire the NTC thermistor in series with the AC or DC power line before the bulk filter capacitors.
• Placement Tip: Position the thermistor away from heat-sensitive components, as it becomes hot during normal steady-state operation.

Datasheet Reference:

• Download 10D-9 NTC Thermistor Datasheet

Commonly Used in:

• Switch Mode Power Supplies (SMPS): Protecting the input stage from the charging current of large capacitors.
• AC Motors: Providing a soft-start mechanism for small appliance motors to prevent tripping circuit breakers.
• CRT Monitors and TVs: Managing the degaussing circuit and main power input.

Applications:

• Power Inverters: Suppressing surges when connecting batteries to high-capacitance inverter inputs.
• LED Lighting Drivers: Preventing the high inrush current typically found in parallel LED driver arrays.
• Transformer Protection: Safeguarding the primary windings of transformers during initial magnetization.

Equivalent Models:

• NTC 10D-9: Direct standard part number across multiple manufacturers like Cantherm and Thinking Electronics.
• SCK-102: A functionally similar series often used in power protection applications.
• MF72-10D9: The specific MF72 series designation for a 10-ohm, 9mm diameter inrush current limiter.

Package Includes:

• 1 x 10D-9 Negative Temperature Coefficient (NTC) Thermistor