SG311

Inrush Current Limiters (ICL) Overview

The SG311 is a SURGE-GARD NTC thermistor inrush current limiter manufactured by Vishay / Ametherm. It features a nominal resistance of 5 Ohms with a tolerance of ±15% and supports a steady-state current rating of 7 A. The device is rated for 265 VAC and operates within a temperature range of 0°C to +65°C. Physical dimensions include a diameter of 0.6 inches (15.24 mm) and a width of 0.25 inches. It utilizes radial leads with an outside kink configuration for PCB mounting.

Inrush Current Limiters (ICL) Feature Summary

• Utilizes specially formulated metal oxide ceramic materials for reliable surge suppression
• Certified to UL standards for safety compliance
• Designed for radial through-hole PCB mounting with outside kinked leads

Inrush Current Limiters (ICL) Applications

• Power supply input stages
• Electronic equipment requiring surge protection
• Industrial control circuits

Inrush Current Limiters (ICL) Procurement Notes

Verify the specific ordering suffix against the official datasheet to ensure correct lead length and packaging configuration. Confirm that the selected variant matches the required voltage and current ratings for the target application circuit. Cross-reference the manufacturer part number with distributor listings to validate authenticity and availability status before finalizing procurement orders.

Inrush Current Limiters (ICL) Selection Notes

Select this component based on its 5 Ohm resistance and 7 Ampere current handling capability. Ensure the operating environment stays within the specified 0°C to +65°C range. Verify that the radial package dimensions fit the available PCB space and that the voltage rating meets the system requirements.

Inrush Current Limiters (ICL) Part Context

The SG311 belongs to the SURGE-GARD series of NTC inrush current limiters from Vishay / Ametherm. This series employs metal oxide ceramic technology to protect sensitive electronics from high initial charging currents during power-up events.

Inrush Current Limiters (ICL) Replacement Considerations

Consult the official Vishay / Ametherm replacement guide for verified substitute part numbers. Do not assume interchangeability with other series components without verifying electrical parameters and physical dimensions.