B57235S0509M054

Overview

The B57235S0509M054 is an NTC thermistor for inrush current limiting manufactured by EPCOS (TDK). It features a resistance of 5 Ohms at 25°C with a ±20% tolerance. The component has a steady-state current rating of 4.2 A and supports voltages of 110 VAC and 230 VAC. Physical dimensions include a 9.5 mm diameter and 6 mm height, with a lead spacing of 5 mm. It operates within a temperature range of -55°C to +170°C and carries a power rating of 1.8 W.

Feature Summary

• Designed specifically for inrush current limiting applications
• Utilizes negative temperature coefficient technology for rapid resistance drop
• Provides robust protection against high initial surge currents
• Supports standard PCB mounting configurations

Applications

• Power supply input stages
• Consumer electronics protection
• Industrial control systems
• Appliance circuit protection

Procurement Notes

Verify the specific ordering suffix M054 corresponds to the required Ammo Pack packaging configuration. Confirm that the 5 Ohm resistance value aligns with the target circuit's surge suppression requirements. Ensure the 4.2 A steady-state current rating exceeds the maximum operational load. Validate compliance with relevant safety standards such as IEC 60068-2-2 and UL 1434 for the intended market.

Selection Notes

Select this component when a 5 Ohm cold resistance is optimal for limiting peak inrush current without excessive power loss during normal operation. The 4.2 A current rating suits moderate power applications. Consider the 9.5 mm radial package size for available PCB space. Verify that the operating temperature range meets environmental conditions. Compare against other S235 series variants if different resistance or current ratings are needed.

Part Context

This part belongs to the TDK S235 series of NTC thermistors designed for inrush current limiting. These components are widely used in electronic circuits to protect sensitive downstream components from damage caused by high initial charging currents. The series offers various resistance values and physical sizes to accommodate diverse application requirements while maintaining consistent performance characteristics.

Replacement Considerations

Direct substitutes within the same series include B57235S0509M000 and B57235S0509M054 variations with identical electrical parameters but potentially different packaging options. Cross-referencing datasheets is essential to confirm matching resistance, current ratings, and thermal characteristics before substitution.