B57211P0109M301

Overview

The B57211P0109M301 is a leaded NTC inrush current limiter from the EPCOS P27 series, manufactured by TDK Electronics. Designed for power supply protection, this component features a nominal resistance of 1 Ohm at 25°C with a tolerance of ±20%. It supports a maximum steady-state current of 30A and exhibits a hot resistance of 13 mOhms under operating conditions. The device utilizes a 30.5mm diameter disk form factor with a standard 7.50mm lead spacing, ensuring compatibility with through-hole mounting processes in industrial and consumer electronic assemblies.

Feature Summary

• Provides effective suppression of high inrush currents during initial power-up phases to protect downstream circuitry
• Utilizes negative temperature coefficient characteristics to automatically reduce resistance as the device heats up
• Features a robust coated disk construction suitable for reliable thermal cycling in demanding environments

Applications

• Power supply input stages for consumer electronics
• Industrial equipment power modules
• Automotive electronic control units
• Information technology hardware power inputs

Procurement Notes

Verify that the specific ordering code matches the required electrical parameters, particularly the 1 Ohm resistance and 30A current rating. Confirm compliance with relevant safety standards such as UL recognition if required for the target market. Ensure the physical dimensions align with the printed circuit board layout constraints before finalizing procurement orders.

Selection Notes

Select this component when designing circuits requiring protection against transient surge currents without introducing significant voltage drop during normal operation. The 1 Ohm nominal value offers a balance between limiting capability and power dissipation. Consider the thermal environment and steady-state current requirements to ensure the device operates within its safe operating area during continuous duty cycles.

Part Context

This part belongs to the EPCOS P27 series of leaded and coated NTC thermistors. The series provides a range of resistance values tailored for various power levels. As part of the TDK Electronics portfolio, these components are engineered for high reliability in automotive, industrial, and consumer applications, focusing on overcurrent protection and signal conditioning.

Replacement Considerations

Compatible substitutes within the same series include B57127P100M301 and B57127P209M301, which share similar physical dimensions but differ in resistance and current ratings. Verify that alternative parts meet the specific electrical requirements of the application before substitution.