B57211P0120M351

Overview

The B57211P0120M351 is an inrush current limiter manufactured by EPCOS (TDK). It features a nominal resistance of 12 ohms with a tolerance of ±20%. The component supports a maximum steady-state current of 4 amps. Its physical dimensions are specified as 0.512 inches, equivalent to 13 millimeters.

Feature Summary

• Provides inrush current limiting functionality
• Features nickel barrier termination for soldering stability
• Designed for compact surface-mount applications

Applications

• Power supply input stages
• Battery pack protection circuits
• Automotive electronics systems

Procurement Notes

Verify the specific part number suffix against official TDK documentation to confirm electrical ratings and package type. Ensure compatibility with standard surface-mount reflow profiles. Confirm that the 12-ohm resistance and 4-amp current rating meet the target circuit requirements before procurement.

Selection Notes

Select this component for applications requiring inrush current suppression in compact designs. Consider the 12-ohm nominal resistance and 4-amp steady-state current capacity. Evaluate thermal management needs based on the 13mm form factor and expected duty cycles in the target application environment.

Part Context

This component belongs to the B57211 series of inrush current limiters from EPCOS (TDK). The series is designed for protecting electronic circuits against high initial charging currents. It utilizes thermistive properties to limit current during power-up phases in various consumer and industrial devices.

Replacement Considerations

Consult official TDK substitution guides for verified alternatives. Cross-reference resistance values and current ratings carefully. Verify package dimensions and termination styles match the existing PCB layout constraints.