B57235S0479M000

Overview

The B57235S0479M000 is a radial lead NTC thermistor designed for inrush current limiting. It features a nominal resistance of 4.7 Ω with a tolerance of ±20% at 25°C. The component has a maximum rated power of 2.1 W and withstands a steady-state current of 4.4 A. Physical dimensions include a length of 11.5 mm, depth of 6 mm, and height of 16 mm. It operates within a temperature range of -55 °C to 170 °C and exhibits a thermal time constant of 70 s.

Feature Summary

• Provides effective suppression of high inrush currents during power-up phases
• Ensures long-term stability under high temperature and humidity conditions
• Offers precise resistance and B-value tolerances for accurate circuit protection

Applications

• Inrush current limiting in electronic power supplies
• Protection circuits for LED modules
• Temperature compensation in industrial equipment

Procurement Notes

Verify the manufacturer part number against official TDK documentation to confirm authenticity. Ensure the specific series designation matches the required electrical characteristics. Check compliance with relevant standards such as IEC 60068-2-78. Confirm that the package type and pin configuration align with the target PCB layout requirements.

Selection Notes

Select this component when a robust NTC solution is needed for managing startup surges. Consider the 4.7 Ω resistance value relative to the system's operating voltage. Evaluate the 4.4 A steady-state current rating against peak load demands. Assess the thermal time constant for response speed requirements in the specific application environment.

Part Context

This part belongs to the B57235S series of NTC thermistors from EPCOS, now part of TDK Electronics. These components are engineered for reliability in demanding environments. The series is widely used in consumer electronics and automotive applications where compact size and high performance are critical for circuit protection.

Replacement Considerations

The Murata NTPA74R0LBMB0 is identified as an obsolete substitute option. Verify lead spacing and physical dimensions before implementation.