NTC 10D-20 Thermal Resistor

NTC 10D-20 Thermal Resistor is a Negative Temperature Coefficient (NTC) thermistor commonly used for inrush current limiting in power supply circuits. It helps protect components by suppressing high surge currents when the circuit is initially powered on. The “10D-20” indicates 10Ω resistance at 25°C and a 20mm disc diameter, suitable for moderate to high power applications.

Key Features:

• Inrush Current Limiting: Prevents damage to components by reducing surge current.
• NTC Characteristics: Resistance decreases as temperature increases.
• High Energy Handling: Handles large surge energy during power-on.
• Stable Performance: Maintains consistent behavior over time and cycles.
• Wide Application Range: Used in power supplies, chargers, motors, and lighting systems.

Technical Specifications:

• Resistance (25°C): 10Ω ±20%
• Disc Diameter: 20mm
• Max Steady-State Current: 5A
• Max Energy Handling: 100J
• Body Temperature Rise: Approx. 220°C at rated current
• B-Value (25/50): 3200K ±5%
• Lead Wire: Tinned copper
• Max Voltage: 250VAC

Mechanical Specifications:

• Package Type: Radial-lead disc thermistor
• Disc Diameter: 20mm
• Lead Spacing: Approx. 7.5mm
• Lead Length: 25mm (approx.)
• Body Coating: Flame-retardant epoxy resin

Mounting Options:

• Through-Hole Mounting: Designed for PCB or chassis insertion.
• Solderable Leads: Compatible with hand and wave soldering processes.

Schematic Diagram, Connection, Wiring and Pinout:

• Connection: Connected in series with the AC line or load to limit inrush current.
• Polarity: Non-polarized; can be installed in either direction.
• Wiring: Use insulated sleeves if installed near heat-sensitive components.

Datasheet and User Manual:

• Download NTC 10D-20 Datasheet (PDF)

Applications:

• Switched Mode Power Supplies (SMPS): Limits current at initial power-up.
• LED Drivers: Protects LED circuits from power surges.
• Battery Chargers: Ensures smooth startup current.
• Home Appliances: Reduces surge risk in TVs, fridges, and AC units.
• Industrial Equipment: Protects motors and relays from inrush damage.

Equivalent Models:

• NTC 10D-15: Smaller disc version for lower surge energy applications
• NTC 10D-9: Compact thermistor for low-power devices
• SL12 10004: EPCOS alternative with similar resistance and dimensions

Package Includes:

• 1 x NTC 10D-20 Thermal Resistor