B57211P0470M301

Overview

The B57211P0470M301 is a negative temperature coefficient (NTC) inrush current limiter manufactured by EPCOS, now part of TDK Electronics. This component features a nominal resistance of 47 Ohms at 25°C with a tolerance of ±20%. It supports a maximum steady-state current of 2A and exhibits a low hot resistance of 615 mOhms. The device utilizes a 13mm diameter disc package with a lead spacing of 7.50mm. It holds safety certifications from CQC, UL, and VDE, ensuring compliance with international standards for electronic components.

Feature Summary

• Provides effective inrush current limiting to protect downstream circuitry during power-up phases
• Features low hot resistance to minimize power loss and heat generation during normal operation
• Constructed with robust ceramic materials for high reliability and long-term stability
• Complies with major international safety standards including UL, VDE, and CQC approvals

Applications

• Power supply input stages for inrush current protection
• Consumer electronics AC/DC adapter circuits
• Industrial control system power inputs
• Automotive electronics power distribution units

Procurement Notes

Verify the manufacturer designation carefully, as EPCOS passive components are now branded under TDK Electronics. Confirm that the specific suffix M301 matches the required lead configuration and packaging format for your assembly process. Ensure the 2A steady-state current rating aligns with your circuit's operational requirements to prevent thermal overload during continuous use.

Selection Notes

Select this component based on its 47 Ohm cold resistance and 2A current handling capability. Evaluate the thermal environment to ensure the 13mm package size provides adequate heat dissipation. Consider the 615 mOhm hot resistance impact on overall system efficiency. Verify that the ±20% tolerance meets the precision requirements of your inrush limiting design without compromising safety margins.

Part Context

This component belongs to the NTC thermistor inrush current limiter series designed for general-purpose protection. It represents a standard solution for managing capacitive load charging currents in various electronic applications. The product line emphasizes reliability and safety certification compliance for global market deployment.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. When sourcing alternatives, ensure equivalent electrical parameters: 47 Ohms resistance, 2A current rating, and 13mm form factor. Verify that any replacement holds identical safety certifications (UL, VDE, CQC) for direct integration.

FAQ

What is the hot resistance of the B57211P0470M301?

The component has a hot resistance of 615 mOhms when operating under rated conditions.

Does this component have international safety approvals?

Yes, it is certified by CQC, UL, and VDE for use in compliant electronic equipment.