B57211P0330M351

Overview

The B57211P0330M351 is a leaded inrush current limiter (ICL) from the P11 series, manufactured by EPCOS (TDK). It features a coated disk design with a nominal resistance of 33 Ohms at 25°C and a tolerance of ±20%. The component supports a maximum steady-state current of 2.5 A, with a hot resistance of 404 mOhms measured at specific current conditions. Physical dimensions include a diameter of 13.00 mm (0.512 inches) and a lead spacing of 7.50 mm (0.295 inches). It is supplied in tape and reel packaging for automated assembly.

Feature Summary

• Leaded and coated disk construction designed for robust inrush current limiting applications
• Multilayer or single-element ceramic composition providing high stability during thermal cycling
• Tape and reel packaging format suitable for high-volume surface mount or through-hole automated insertion processes

Applications

• Power supply input stages for consumer electronics
• Industrial control systems requiring overcurrent protection
• Automotive electronic modules needing surge suppression

Procurement Notes

Verify the complete part number including suffix M351 to confirm tape and reel packaging specifications. Ensure compatibility with peak pulse current ratings during initial power-up phases. Confirm that the steady-state current rating of 2.5 A aligns with the operational requirements of the target circuit to prevent thermal degradation. Cross-reference manufacturer documentation for specific derating curves under varying ambient temperatures.

Selection Notes

Select this component based on the required cold resistance value of 33 Ohms to limit initial charging currents effectively. Evaluate the maximum steady-state current capacity against continuous load requirements. Consider the physical footprint constraints given the 13 mm diameter and 7.5 mm lead spacing. Assess thermal management needs as the device dissipates energy during inrush events. Verify that the ±20% resistance tolerance meets the precision requirements of the application design.

Part Context

This component belongs to the P11 series of inrush current limiters produced by EPCOS, now integrated into TDK Electronics. The series focuses on protecting sensitive electronic circuits from high initial charging currents common in capacitive loads. These devices are widely utilized in power conversion systems where reliable surge protection is critical for maintaining component longevity and system stability.

Replacement Considerations

Direct substitutes may include other P11 series variants with adjusted resistance values, such as B57211P0200M351 or B57211P0160M351, provided current and dimensional constraints are met. Verify equivalent thermal characteristics and package compatibility before substitution.