B57234S0259M051

Overview

The B57234S0259M051 is an NTC thermistor inrush current limiter from the EPCOS (TDK) S234 series. It features a nominal resistance of 2.5 Ohms at 25°C with a tolerance of ±20%. The component has a B-value of 2800K and a maximum power rating of 1.8 W. It supports continuous currents up to 3.5 A and operates within a voltage range of 110 VAC and 230 VAC. The physical dimensions are 9.5 mm diameter by 6 mm width, with a lead spacing of 5 mm. Operating temperature ranges from -55°C to +170°C.

Feature Summary

• Utilizes negative temperature coefficient characteristics to effectively limit high inrush currents during power-up.
• Features radial leads for reliable through-hole PCB mounting.
• Designed for robust performance across wide industrial operating temperatures.

Applications

• Power supply input stages
• Consumer electronics protection
• Industrial equipment surge suppression

Procurement Notes

Verify the specific datasheet version when sourcing, as EPCOS documentation may reference legacy part numbers or updated series designations. Confirm that the 2.5 Ohm resistance value aligns with your circuit's thermal management requirements. Ensure the 1.8 W power rating is sufficient for your application's duty cycle. Cross-reference the 9.5 mm diameter package against your PCB footprint constraints before finalizing procurement.

Selection Notes

Select this component when a 2.5 Ohm initial resistance is required to manage startup surges. The 2800K B-value indicates specific thermal sensitivity suitable for standard inrush limiting tasks. Consider the 3.5 A current rating to ensure the device does not overheat during normal operation. The 110/230 VAC rating makes it appropriate for mains-connected devices. Verify that the 5 mm lead spacing fits your assembly process.

Part Context

This part belongs to the EPCOS S234 series of NTC thermistors, which are specialized for inrush current limiting. The series offers various resistance values tailored to different power levels. TDK acquired EPCOS, integrating these components into its broader portfolio of electronic parts. These disc-shaped thermistors are widely used in global manufacturing for protecting sensitive circuits from initial current spikes.

Replacement Considerations

Check for direct substitutes within the B57234 series with matching 2.5 Ohm resistance. Verify that any alternative maintains the same 9.5 mm diameter and 5 mm lead spacing. Ensure the replacement supports the required 1.8 W power rating and 3.5 A current capacity. Confirm compatibility with the -55°C to +170°C operating range.