B57235S0259M051

Overview

The B57235S0259M051 is a negative temperature coefficient (NTC) thermistor designed for inrush current limiting applications. It features a nominal resistance of 2.5 Ohms at 25°C with a tolerance of ±20%. The component supports a maximum steady-state current of 5.2 A and has a power rating of 1.8 W. Its physical dimensions include a body diameter of 9.5 mm, a thickness of 6.0 mm, and a lead spacing of 5 mm. The operating temperature range spans from -55°C to +170°C.

Feature Summary

• Provides effective suppression of high inrush currents during power-up sequences.
• Features radial leads for through-hole printed circuit board mounting.
• Constructed as a coated disk thermistor for reliable environmental protection.

Applications

• Inrush current limiting in electronic circuits
• Power supply input protection
• General circuit protection against surge currents

Procurement Notes

Verify the specific suffix codes against official TDK documentation to confirm exact dimensional tolerances and lead specifications. Ensure that the thermal management requirements align with the component's rated power dissipation and ambient operating conditions. Confirm compliance with relevant safety standards such as IEC 60068-2-2 and UL 1434 if required for the end application.

Selection Notes

Select this component based on the required nominal resistance value and the maximum steady-state current capacity of the target circuit. Consider the physical size constraints regarding the 9.5 mm diameter and 6.0 mm thickness. Evaluate the thermal environment to ensure operation within the specified -55°C to +170°C range without exceeding the 1.8 W power rating.

Part Context

This part belongs to the B57235 series of NTC thermistors manufactured by EPCOS, a TDK Group company. These components are specifically engineered for inrush current limiting duties. The series utilizes a coated disk design suitable for through-hole assembly, providing a robust solution for protecting sensitive electronic components from initial power surge damage.

Replacement Considerations

Compatible substitutes within the same family include B57235S0509M051 (5 Ohms) and B57235S0809M051 (8 Ohms). Selection depends on matching the specific resistance and current handling requirements of the circuit design.