B57211P0100M301

Overview

The B57211P0100M301 is a radial leaded Negative Temperature Coefficient (NTC) thermistor from the EPCOS P11 series, functioning as an inrush current limiter. It features a zero-power resistance of 10 Ohms at 25°C with a tolerance of ±20%. The component supports a maximum steady-state current of 4 A and has a disc diameter of 13 mm (0.512 inches). Its low hot resistance is 203 mOhms, and it utilizes a lead spacing of 7.50 mm.

Feature Summary

• Provides effective suppression of high inrush currents during power-up to protect downstream electronic components.
• Utilizes NTC characteristics to automatically reduce resistance as temperature increases, minimizing power loss during normal operation.
• Features robust mechanical construction with nickel barrier termination for reliable soldering and long-term stability.

Applications

• Protection circuits in switching mode power supplies (SMPS)
• Inrush current limiting in industrial control systems
• Surge protection for consumer electronics and home appliances

Procurement Notes

Verify that the specific part number matches the required resistance and current ratings for your circuit design. Confirm compliance with relevant safety standards such as UL or VDE if required for your application. Ensure the thermal environment allows for proper heat dissipation during steady-state operation to maintain component integrity.

Selection Notes

Select this component based on its 10 Ohm initial resistance and 4 A steady-state current capability. Consider the energy rating and maximum allowable current for transient conditions. Ensure the physical dimensions fit the available PCB space and that the lead spacing aligns with the board layout requirements.

Part Context

This component belongs to the B57211P series of inrush current limiters manufactured by EPCOS, now part of TDK Electronics. These devices are designed specifically for protecting sensitive electronic circuits from damage caused by high surge currents during initial power application.

Replacement Considerations

Compatible substitutes include other NTC inrush limiters with similar 10 Ohm resistance and 4 A current ratings, such as the B57211P0470M301 for lower current applications or variants within the same P11 series offering matching electrical parameters and package dimensions.

FAQ

What is the function of the B57211P0100M301?

It acts as an inrush current limiter, using its negative temperature coefficient property to restrict high startup currents and then allowing full current flow once heated.

What is the steady-state current rating?

The maximum steady-state current rating is 4 A.