B57211P0259M351

Overview

The B57211P0259M351 is a leaded inrush current limiter (ICL) from the P11 series by EPCOS (TDK). It features a 25 Ohm resistance at 25°C with ±20% tolerance and supports a maximum steady-state current of 2.5 A. The component has a disk diameter of 13.00 mm (0.512 inches) and a lead spacing of 7.50 mm (0.295 inches). It offers high energy absorption capabilities to protect circuits during power-up transients.

Feature Summary

• Provides effective inrush current limiting for sensitive electronic components
• Features robust leaded construction with coated disk design
• Ensures reliable circuit protection against high initial surge currents

Applications

• Power supply input stages
• Transformer primary windings
• Capacitor charging circuits

Procurement Notes

Verify the specific part number suffix to confirm resistance and current ratings, as variations exist within the P11 series. Ensure compatibility with peak pulse current requirements of the target application. Confirm that the steady-state current rating aligns with operational limits to prevent thermal degradation. Check for required safety certifications such as UL or VDE if applicable to the end product.

Selection Notes

Select this component based on the required cold resistance value and maximum operating current. Consider the physical dimensions to ensure adequate clearance on the PCB. Evaluate the energy absorption capacity relative to the expected surge profile. Compare alternative ICL models if higher current handling or different resistance values are needed.

Part Context

This component belongs to the P11 series of inrush current limiters manufactured by EPCOS, now part of TDK Electronics. These devices are designed for general-purpose circuit protection in consumer and industrial electronics. The series provides a balance of performance and cost-effectiveness for managing startup surges in various power applications.

Replacement Considerations

Compatible substitutes include other P11 series variants with matching electrical characteristics. Verify that any replacement maintains the same resistance tolerance and steady-state current rating. Ensure physical dimensions and lead spacing are compatible with existing board layouts.