SL125R004T

Inrush Current Limiters (ICL) Overview

The SL125R004T is a radial lead-in inrush current limiter from the Vishay Ametherm SL12 series. It features a nominal resistance of 5 Ohms with a tolerance of 20%. The component is rated for a steady-state current of 4A and operates at voltage ratings of 115 VAC or 230 VAC. It has a cylindrical body diameter of 13 mm. This thermistor limits initial surge currents during power-up to protect downstream electronic components.

Inrush Current Limiters (ICL) Feature Summary

• Provides high initial resistance to restrict surge current flow upon circuit energization
• Automatically transitions to low-resistance state as self-heating occurs during operation
• Radial leaded construction facilitates through-hole printed circuit board mounting

Inrush Current Limiters (ICL) Applications

• Power supply input stages
• Transformer primary circuits
• Capacitive load protection

Inrush Current Limiters (ICL) Procurement Notes

Verify the specific suffix 'T' against the manufacturer datasheet to confirm tape-and-reel packaging requirements if automated assembly is intended. Ensure the operating environment temperature remains within the specified thermal limits to maintain stable resistance characteristics. Confirm that the 4A steady-state current rating exceeds the maximum continuous load expected in the target application circuit.

Inrush Current Limiters (ICL) Selection Notes

Select this component when a 5 Ohm initial impedance is required to limit inrush current for loads drawing up to 4A. The 13 mm diameter provides sufficient thermal mass for repeated surge events. Consider the SL12 series family for standardized dimensions and electrical characteristics across similar current and resistance values.

Inrush Current Limiters (ICL) Part Context

This part belongs to the Vishay Ametherm SL12 series of negative temperature coefficient (NTC) thermistors designed specifically for inrush current limiting. The series offers various resistance and current combinations housed in standard cylindrical packages. These components are widely used in consumer electronics and industrial power supplies to prevent contact welding and fuse blowing.

Inrush Current Limiters (ICL) Replacement Considerations

Cross-reference equivalent parts from other manufacturers offering 5 Ohm, 4A NTC thermistors with comparable 13 mm dimensions. Verify that substitute components meet the same UL safety approvals and thermal endurance specifications required by the original design.