B57234S0509M000

Overview

The B57234S0509M000 is a leaded NTC thermistor designed for inrush current limiting. It features a nominal resistance of 5 Ω at 25°C with a tolerance of ±20%. The component has a disk diameter of 15 mm and a height of 6.4 mm, utilizing radial leads spaced 5 mm apart. It operates within a temperature range of -55°C to +170°C and carries a maximum rated power of 1.8 W. The device exhibits a Beta value (B25/100) of 2900 K and a thermal time constant of 60 seconds in still air.

Feature Summary

• Provides effective protection against high surge currents during circuit startup
• Features a robust epoxy-coated disk construction for environmental stability
• Designed for through-hole PCB mounting with radial lead configuration

Applications

• Inrush current limiting in AC/DC power supplies
• Surge protection for consumer electronic devices
• Industrial equipment power input stages

Procurement Notes

Verify the specific part number suffix against official TDK documentation to confirm exact dimensional tolerances and lead spacing. Ensure that the selected variant matches the required voltage rating and thermal characteristics for the target application environment. Cross-reference manufacturer datasheets for precise handling and soldering guidelines.

Selection Notes

Select this component based on its 5 Ω resistance and 15 mm disk size suitable for moderate surge energy absorption. Consider the 2900 K Beta value for accurate temperature-resistance mapping. Evaluate the 1.8 W power rating against peak load requirements to ensure reliable long-term operation without thermal degradation.

Part Context

This component belongs to the B5723xS series of NTC thermistors manufactured by EPCOS, now part of TDK Electronics. These devices are specialized for inrush current limiting applications, offering a balance between low steady-state resistance and high surge capacity. The series is widely used in general-purpose electronics where cost-effective surge protection is required.

Replacement Considerations

Public confirmed substitute part numbers include B57234S0509M000 equivalents from the same family such as B57234S0509M001 if dimensional compatibility allows. Verify electrical parameters like resistance and Beta value before substitution.