SG40

Inrush Current Limiters (ICL) Overview

The SG40 is a radial leaded NTC thermistor inrush current limiter from the SURGE-GARD series, designed for PCB mounting. It features a nominal resistance of 10 Ohms with a tolerance of 20%. The component supports a continuous current rating of 8 A and operates at voltages up to 265 VAC. Physical dimensions include a diameter of 0.9 inches (22.86 mm) and a width of 0.3 inches (7.62 mm). Lead specifications are 0.04 inches in diameter with a spacing of 0.35 inches. Operating temperature ranges from 0°C to +65°C.

Inrush Current Limiters (ICL) Feature Summary

• Utilizes negative temperature coefficient (NTC) thermistor technology to limit initial surge currents during power-up.
• Features kinked radial leads designed for secure through-hole PCB mounting and mechanical stability.
• Complies with UL safety standards for use in electronic equipment requiring surge protection.

Inrush Current Limiters (ICL) Applications

• Power supply input stages
• Transformer inrush current limiting
• Capacitor charging circuits

Inrush Current Limiters (ICL) Procurement Notes

Verify the specific ordering suffix against the manufacturer datasheet to confirm lead form and packaging details. Ensure the selected variant matches the required voltage and current ratings for the target application circuit. Cross-reference the UL certification status if regulatory compliance is mandatory for the end product deployment.

Inrush Current Limiters (ICL) Selection Notes

Select this component based on the required steady-state current capacity of 8 A and the specific cold resistance value of 10 Ohms. Confirm that the operating environment stays within the 0°C to +65°C temperature range. Evaluate the physical footprint requirements against the available PCB space, considering the 0.9-inch diameter and lead spacing constraints.

Inrush Current Limiters (ICL) Part Context

The SG40 belongs to the Vishay Ametherm SURGE-GARD family of inrush current limiters. This series provides reliable protection for sensitive electronics by reducing high initial currents. The SG40 specifically addresses applications requiring moderate resistance values and standard radial lead configurations for general-purpose power management.

Inrush Current Limiters (ICL) Replacement Considerations

Direct substitutes require matching 10 Ohm resistance, 8 A current rating, and 265 VAC voltage rating. Verify lead dimensions and thermal characteristics before integration. Consult official cross-reference lists for approved equivalents.