B57213P0409M301

Overview

The B57213P0409M301 is a leaded inrush current limiter from the P13 series, manufactured by EPCOS (TDK). It features a nominal resistance of 4 Ohms at 25°C with a tolerance of ±20%. The component supports a maximum steady-state current of 6 A and has a physical diameter of 14.5 mm. Key electrical parameters include a dissipation factor of 15 mW/K and a power rating of 3.8 W.

Feature Summary

• Provides effective limitation of high inrush currents during power-up phases to protect downstream electronic circuits.
• Utilizes a coated disk design suitable for through-hole mounting in various industrial and consumer applications.
• Offers stable thermal performance with defined dissipation characteristics for reliable operation under load.

Applications

• Power supply input stages
• Industrial control systems
• Consumer electronics

Procurement Notes

Verify the specific suffix M301 against the official TDK datasheet to confirm package dimensions and marking details. Ensure the application environment does not exceed the specified maximum steady-state current of 6 A. Confirm that the 4 Ohm resistance value aligns with the circuit's inrush limiting requirements. Check for RoHS compliance status in the latest product documentation before finalizing procurement orders.

Selection Notes

Select this component when a 4 Ohm initial resistance is required to limit surge currents up to 6 Amperes continuously. The 14.5 mm diameter form factor fits standard through-hole layouts. Consider the 3.8 W power rating for thermal management planning. This part is appropriate for general-purpose protection in AC/DC conversion stages where moderate inrush suppression is sufficient.

Part Context

This component belongs to the B57213P series of inrush current limiters produced by EPCOS, now integrated into TDK Electronics. The P13 series specifically denotes leaded and coated disk thermistors designed for robust overcurrent protection. These devices are widely used across automotive, industrial, and consumer sectors to ensure circuit stability during startup events.

Replacement Considerations

Cross-reference with other P13 series variants such as B57213P0xxxM301 for different resistance values. Verify mechanical compatibility with existing PCB footprints. Ensure thermal derating curves match the new component's specifications if substituting within the same family.