NTC 47D15 Thermistor 47Ω 3A THT 15mm Diameter

The NTC 47D15 is a negative temperature coefficient thermistor, meaning its resistance decreases as temperature increases. With a nominal resistance of 47Ω at 25°C and a maximum steady-state current of 3A, this component is especially used in circuits where the initial current must be limited when the equipment is switched on.

This type of NTC thermistor is widely used as an inrush current limiter, helping reduce current peaks in power supplies, chargers, electronic equipment, power modules, circuits with input capacitors and other systems exposed to high startup current.

When the circuit is powered on, the thermistor initially presents a higher resistance, helping limit the current surge. During operation, it naturally heats up due to current flow and its resistance drops, allowing normal current flow with lower loss.

With THT/radial mounting, the NTC 47D15 is easy to install on printed circuit boards, prototyping boards, power supplies, repair jobs and electronic projects. The 47Ω value provides higher initial current limiting compared with lower-resistance models, making it suitable for applications where the startup current peak needs to be reduced more strongly.

Main features

NTC thermistor
Type: negative temperature coefficient
Reference: NTC 47D15
Nominal resistance: 47Ω
Resistance measured at: 25°C
Maximum steady-state current: 3A
Mounting: THT / radial
Disc diameter: 15mm
Approximate resistance at maximum current: ~6.8Ω
Thermal dissipation constant: 21mW/°C
Thermal time constant: 86 seconds
Minimum operating temperature: -55°C
Maximum operating temperature: +200°C
Polarity: non-polarized
Component type: passive
Main application: inrush current limiting
Suitable for power supplies and protection circuits
Suitable for repair, maintenance and electronic projects

Recommended applications

Inrush current limiting
Startup current surge protection
Power supplies
Switch mode power supplies / SMPS
Battery chargers
Power modules
Soft-start circuits
Lighting systems
Electronic ballasts
Electric motors
UPS systems
Filament protection in lamps and tubes
Equipment with input capacitors
Power supply and PCB repair
Electronic projects requiring a 47Ω / 3A NTC thermistor

Important note

Before use, always confirm the nominal resistance, maximum current, diameter, lead spacing, tolerance, beta value, operating temperature and compatibility with the original circuit. The NTC 47D15 must be selected according to the real circuit current, applied voltage, startup surge energy, ambient temperature and available board space.

This component should not be replaced based only on its physical shape. In power supplies and mains-powered circuits, choosing the wrong thermistor may cause excessive heating, insufficient protection or equipment failure. For temperature sensor applications, confirm that the circuit is designed for a 47Ω NTC, as many 3D printer sensors and controllers use much higher values, such as 10kΩ or 100kΩ.