B57236S0259M051

Overview

The B57236S0259M051 is a negative temperature coefficient (NTC) thermistor designed for inrush current limiting applications. Manufactured by EPCOS, a TDK Group Company, this component features a radial leaded and coated disk package with a nominal resistance of 2.5 ohms at 25°C. It supports a maximum steady-state current of 5A and operates within a temperature range of -55°C to 170°C. The device is rated for AC voltages up to 265V and dissipates up to 2.1W of power. Key electrical parameters include a B value of 3165K and a thermal time constant of approximately 70s.

Feature Summary

• Provides effective suppression of high inrush currents during power-up sequences in electronic circuits.
• Features a robust radial leaded and coated disk construction suitable for through-hole mounting.
• Maintains stable performance across a wide operating temperature range from -55°C to 170°C.

Applications

• Power supply input stages for inrush current protection
• AC/DC converter circuits requiring surge limitation
• General electronics equipment mains input filtering

Procurement Notes

Verify the specific ordering suffix M051 against the manufacturer's latest datasheet to ensure correct packaging and tolerance specifications. Confirm that the 2.5-ohm resistance and 5A current rating align with the target circuit requirements. Check for RoHS compliance status and relevant safety certifications such as UL or VDE before finalizing procurement decisions.

Selection Notes

Select this component based on its 2.5-ohm nominal resistance and 5A continuous current capability. Ensure the application environment stays within the -55°C to 170°C operational limits. Consider the physical dimensions of the 11.5mm disk package for PCB layout compatibility. Verify that the thermal characteristics meet the system's heat dissipation needs during normal operation.

Part Context

This part belongs to the B57236S series of NTC thermistors specifically engineered for inrush current limiting. The series utilizes leaded and coated disk technology to provide reliable protection in various power electronics applications. EPCOS, now part of the TDK Group, manufactures these components to meet stringent industry standards for durability and electrical performance.

Replacement Considerations

Compatible substitutes within the same series include B57236S0250M051 and B57236S0309M051. Verify that alternative parts match the 2.5-ohm resistance, 5A current rating, and radial package dimensions. Cross-reference the B value and thermal time constant to ensure equivalent circuit behavior in the specific application.