B57211P0409M301

Overview

The B57211P0409M301 is a leaded inrush current limiter (ICL) from the EPCOS P11 series, manufactured by TDK Electronics. It features a nominal resistance of 4 Ohms with a tolerance of ±20%. The component supports a maximum steady-state current of 5 A and has a body diameter of 13 mm (0.512 inches). Designed for robust protection, it utilizes a bulk packaging format and is compliant with RoHS standards.

Feature Summary

• Provides effective inrush current limiting to protect downstream electronic circuits during power-up phases.
• Features self-resetting functionality that automatically returns to high-resistance state after cooling.
• Constructed with a durable ceramic element housed in a standard axial-leaded package for reliable mounting.

Applications

• Switching power supplies
• Consumer electronics equipment
• Industrial control systems

Procurement Notes

Verify the specific part number suffix against official TDK documentation to confirm exact electrical ratings and mechanical dimensions. Ensure compatibility with required thermal management and steady-state current limits for the target application circuit design.

Selection Notes

Select this component based on the required nominal resistance value and maximum steady-state current rating. Consider the physical package size and lead configuration for PCB layout constraints. Verify compliance with relevant safety certifications if used in regulated environments.

Part Context

This component belongs to the EPCOS P11 series of inrush current limiters. EPCOS components are now integrated into TDK Electronics, which continues to manufacture these protective devices for global markets. The series is known for providing reliable overcurrent protection in various electronic applications.

Replacement Considerations

Consult official TDK cross-reference lists for verified substitute part numbers. Generic equivalents may not match the specific thermal characteristics or resistance curves of the original component.

FAQ

What is the nominal resistance value of the B57211P0409M301?

The nominal resistance at 25°C is 4 Ohms with a tolerance of ±20%.

What is the maximum steady-state current rating?

The component is rated for a maximum steady-state current of 5 A.