B57213P0220M301

Overview

The B57213P0220M301 is a leaded Negative Temperature Coefficient (NTC) inrush current limiter manufactured by EPCOS, now part of TDK Electronics. This component features a nominal resistance of 22 Ohms with a tolerance of ±20% at 25°C. It supports a maximum steady-state current of 4 A and exhibits a low hot resistance of 200 mOhms when conducting. The device has a body diameter of 14.5 mm, designed for through-hole mounting to protect electronic circuits against high initial charging currents.

Feature Summary

• Provides effective limitation of high inrush currents during power-up sequences
• Features rapid thermal response to transition from high resistance to low impedance state
• Constructed with robust leaded design suitable for standard PCB mounting processes

Applications

• Power supply input stages for consumer electronics
• Industrial control system power modules
• Automotive electronic unit protection circuits

Procurement Notes

Verify the specific ordering suffix M301 to confirm lead configuration and packaging format. Ensure the selected variant matches the required thermal characteristics and mechanical dimensions for the target application board layout. Cross-reference the manufacturer datasheet for detailed soldering guidelines and thermal derating curves to guarantee long-term reliability under operating conditions.

Selection Notes

Select this component based on the required cold resistance value of 22 Ohms and the maximum continuous current rating of 4 A. Consider the test capacitance values provided for different AC voltage ranges to ensure compatibility with the specific circuit's energy absorption requirements. Evaluate the physical size constraints to accommodate the 14.5 mm diameter body within the available PCB space.

Part Context

This component belongs to the B57213 series of NTC inrush current limiters produced by EPCOS, which has been integrated into TDK Electronics. The series is widely utilized across various industries for protecting sensitive electronic components from damage caused by excessive initial current surges during equipment startup.

Replacement Considerations

Direct substitutes must match the 22 Ohm resistance, 4 A current rating, and 14.5 mm form factor. Verify thermal performance equivalence before implementation.