B57236S0479M051

Overview

The B57236S0479M051 is a leaded NTC thermistor from the B57236S series, designed for inrush current limiting. It features a nominal resistance of 4.7 Ω at 25°C with a ±20% tolerance and a thermal index (B value) of 3165 K. The component has a maximum rated power dissipation of 2.1 W and operates within a temperature range of -55°C to +170°C. It utilizes a radial through-hole mounting configuration with a disk package measuring 11.5 mm in diameter and 6.0 mm in width.

Feature Summary

• Provides effective inrush current limitation during power-up phases
• Features high thermal stability across a wide operating temperature range
• Utilizes a robust disk package suitable for through-hole PCB integration

Applications

• Inrush current limiting in AC/DC power supplies
• Protection circuits for industrial electronic equipment
• Surge current suppression in consumer electronics

Procurement Notes

Verify the specific suffix 'M051' against official TDK documentation to confirm terminal plating and packaging details. Ensure the selected variant matches the required thermal time constant and steady-state current ratings for the target application circuit.

Selection Notes

Select this component based on the required 4.7 Ω cold resistance and 2.1 W power rating. Confirm that the 11.5 mm disk dimensions fit the available PCB space and that the radial lead spacing aligns with the board layout requirements.

Part Context

This part belongs to the EPCOS B57236S series of NTC thermistors specifically engineered for surge current protection. These components are widely utilized in power supply inputs to protect downstream capacitors and rectifiers from high initial charging currents.

Replacement Considerations

Compatible substitutes within the same series include B57236S0100M051 and B57236S0309M051. Verify that alternative part numbers match the specific resistance values and physical dimensions required for the design.