B57237S0709M051

Inrush Current Limiters (ICL) Overview

The B57237S0709M051 is an NTC thermistor for inrush current limiting manufactured by EPCOS (TDK). It features a nominal resistance of 7 Ohms with a tolerance of 20%. The component has a current rating of 4.2 A and supports voltages of 110 VAC and 230 VAC. Physical dimensions include a diameter of 15 mm and a width of 7 mm, with a lead spacing of 7.5 mm. It operates within a temperature range of -55°C to +170°C and has a power rating of 3.1 W.

Inrush Current Limiters (ICL) Feature Summary

• Designed specifically for limiting inrush currents in electronic circuits.
• Utilizes Negative Temperature Coefficient (NTC) technology for rapid resistance reduction after startup.
• Constructed as a leaded and coated disk component for robust mounting.

Inrush Current Limiters (ICL) Applications

• Power supply input stages
• Transformer protection circuits
• General electronic equipment surge suppression

Inrush Current Limiters (ICL) Procurement Notes

Verify the specific ordering suffix against official TDK/EPCOS documentation to ensure exact electrical characteristics match the design requirements. Confirm that the RoHS compliance status aligns with current regulatory standards for the target market. Cross-reference the package type and lead spacing with PCB layout specifications to guarantee mechanical compatibility during assembly.

Inrush Current Limiters (ICL) Selection Notes

Select this component based on the required steady-state resistance and maximum allowable inrush current for the application. Ensure the voltage rating covers the peak line voltage conditions. Evaluate the thermal environment to confirm operation remains within the specified -55°C to +170°C range. Consider the physical size constraints relative to the 15 mm diameter and 7.5 mm lead spacing.

Inrush Current Limiters (ICL) Part Context

This part belongs to the B57237S series of NTC thermistors intended for inrush current limiting. These components are engineered to protect sensitive electronics from high initial charging currents. The series offers various resistance values and current ratings to suit different power levels and circuit designs.

Inrush Current Limiters (ICL) Replacement Considerations

Direct substitutes must match the 7 Ohm resistance, 4.2 A current rating, and 15 mm diameter. Verify equivalent voltage ratings and operating temperature ranges. Check for identical lead spacing and mounting configuration to ensure seamless integration without PCB redesign.

Inrush Current Limiters (ICL) FAQ

What is the primary function of the B57237S0709M051?

It functions as an inrush current limiter using NTC thermistor technology to reduce initial surge currents during power-up.

What is the operating temperature range for this component?

The component operates reliably within a temperature range of -55°C to +170°C.