SG317

Inrush Current Limiters (ICL) Overview

The SG317 is a radial leaded Negative Temperature Coefficient (NTC) thermistor from the Vishay Ametherm Surge-Gard series, designed for PCB mounting. It functions as an inrush current limiter with a resistance at +25°C of 120 Ohms and a tolerance of ±15%. The component supports a continuous current rating of 3 A and operates within a temperature range of -40°C to +85°C.

Inrush Current Limiters (ICL) Feature Summary

• Utilizes NTC thermistor technology to limit initial surge currents during power-up
• Features kinked leads for secure mechanical attachment on printed circuit boards
• Complies with UL safety standards for industrial applications

Inrush Current Limiters (ICL) Applications

• Power supply input stages
• Electronic ballast circuits
• Motor drive protection

Inrush Current Limiters (ICL) Procurement Notes

Verify the specific suffix code against the official datasheet to confirm lead configuration and tolerance class. Ensure the selected variant matches the required thermal dissipation characteristics for the target application environment. Cross-reference the manufacturer's latest revision notes for any updates to mechanical dimensions or material composition before finalizing procurement orders.

Inrush Current Limiters (ICL) Selection Notes

Select this component based on the 120 Ohm cold resistance value and 3 Ampere steady-state current capability. Confirm that the operating voltage does not exceed the rated limits defined in the electrical specifications. Evaluate the thermal time constant requirements to ensure adequate surge suppression performance during startup transients in the specific circuit topology.

Inrush Current Limiters (ICL) Part Context

This part belongs to the SG series of Surge-Gard inrush current limiters manufactured by Vishay / Ametherm. These components are specialized NTC thermistors intended for protecting sensitive electronic equipment from high initial charging currents. The series offers various resistance values and package styles to accommodate different power levels and board layout constraints.

Inrush Current Limiters (ICL) Replacement Considerations

Direct substitutes include other Vishay Ametherm parts within the SG series offering similar 120 Ohm resistance and 3 A current ratings. Verify that alternative components match the physical footprint, specifically the radial lead spacing and diameter, to ensure compatibility with existing PCB layouts without requiring design modifications.

Inrush Current Limiters (ICL) FAQ

What is the resistance value of the SG317 at room temperature?

The resistance at +25°C is 120 Ohms with a tolerance of ±15%.

Does the SG317 have UL approval?

Yes, the component is UL approved for use in relevant electronic assemblies.