B57127P209M301

Overview

The B57127P209M301 is a leaded and coated NTC inrush current limiter from the P27 series by EPCOS (TDK). It features a nominal resistance of 2.0 Ohms at 25°C with a tolerance of ±20%. The component supports a maximum steady-state current of 23A and has a disk diameter of 30.5mm. It utilizes axial leads for PCB mounting and holds UL certification under standards 1434 and E69802.

Feature Summary

• Leaded and coated disk construction for mechanical robustness
• Negative temperature coefficient behavior for surge suppression
• Axial lead configuration designed for printed circuit board integration

Applications

• Surge current limiting in power supply input stages
• Soft-start circuits for motor drives
• Protection against inrush currents in electronic equipment

Procurement Notes

Verify that the ordering suffix M301 corresponds to the specific lead length and coating requirements defined in the official datasheet. Confirm that the component meets the required UL recognition standards for the target application. Ensure the selected part number matches the exact resistance and current ratings needed for the circuit design without relying on generic family descriptions.

Selection Notes

Select this component based on the specific 2.0 Ohm resistance and 23A steady-state current rating. Compare these parameters against other variants in the B57127P series, such as the B57127P509M301 or B57127P100M301, to ensure the thermal and electrical characteristics align with the system's peak load and surge requirements.

Part Context

This device belongs to the B57127P0***M301 series of NTC inrush current limiters manufactured by EPCOS, now part of the TDK Group. The series offers various resistance values ranging from 0.5 Ohms to higher ohmic values, all sharing the same 30.5mm disk diameter and leaded package style for consistent mechanical integration.

Replacement Considerations

Direct substitutes within the same series include B57127P109M301 (1.0 Ohm, 30A) and B57127P509M301 (5.0 Ohm, 20A). Verify that the alternative part's resistance and current ratings are compatible with the original circuit design before substitution.