B57213P0120M301

Overview

The B57213P0120M301 is a leaded inrush current limiter manufactured by EPCOS, now part of TDK Electronics. This component functions as a positive temperature coefficient (PTC) thermistor designed to limit high startup currents in electronic circuits. It features a nominal resistance of 12 Ohms with a tolerance of ±20% and supports a continuous operating current of 4 Amperes. The device utilizes a radial leaded package with a maximum body diameter of approximately 14.50mm, suitable for through-hole mounting on printed circuit boards.

Feature Summary

• Provides effective suppression of high inrush currents during power-up phases
• Utilizes PTC thermistor technology for automatic resettable protection
• Designed for robust performance in consumer and industrial electronics

Applications

• Power supply input stages
• Consumer electronic devices
• Industrial control systems

Procurement Notes

Verify the specific manufacturer designation, as EPCOS passive components are increasingly branded under TDK Electronics. Confirm that the requested part number matches the exact electrical specifications required for the application, particularly the 12 Ohm resistance and 4A current rating. Ensure compatibility with the intended thermal environment and mounting requirements.

Selection Notes

Select this component based on the required steady-state resistance and maximum surge current handling capabilities. Consider the physical dimensions for board space constraints and verify the lead configuration for assembly processes. Evaluate the thermal dissipation characteristics relative to the ambient operating conditions of the target equipment.

Part Context

This component belongs to the B57213 series of inrush current limiters produced by EPCOS, which has been integrated into TDK Electronics. These parts are essential for protecting sensitive downstream components from damage caused by high initial charging currents in capacitive loads or transformer inputs.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. When sourcing alternatives, ensure the replacement meets the same resistance, current, and voltage ratings.