SG331

Inrush Current Limiters (ICL) Overview

The SG331 is a negative temperature coefficient (NTC) thermistor inrush current limiter from the Vishay Ametherm SURGE-GARD series. Designed for PCB mounting with radial leads, it features a nominal resistance of 5 Ohms and a tolerance of ±15%. The component supports a maximum steady-state current of 7 A and operates at voltage ratings up to 265 VAC. Physical dimensions include a diameter of 0.600 inches (15.24 mm). It functions by limiting initial surge currents during power-up while maintaining low resistance during normal operation.

Inrush Current Limiters (ICL) Feature Summary

• Utilizes NTC thermistor technology to provide high initial resistance that decreases as temperature rises
• Radial lead configuration designed for direct printed circuit board mounting
• Engineered to protect sensitive electronic components from damaging power-on surge currents

Inrush Current Limiters (ICL) Applications

• Power supply input stages
• Consumer electronics AC/DC adapters
• Industrial control equipment

Inrush Current Limiters (ICL) Procurement Notes

Verify the specific lead style against project requirements, as variants exist with kinked or straight leads. Confirm thermal management capabilities within the final assembly to ensure the device remains within its specified operating temperature range of 0°C to +65°C. Cross-reference the datasheet for precise energy absorption ratings relevant to the target application's surge profile.

Inrush Current Limiters (ICL) Selection Notes

Select this component based on the required 5 Ohm resistance value and 7 A current handling capacity. Ensure the physical footprint accommodates the 0.600-inch diameter. Consider the voltage rating relative to the system's peak line voltage. Evaluate the thermal environment to guarantee stable performance without exceeding the maximum operating temperature limits defined in the official specifications.

Inrush Current Limiters (ICL) Part Context

The SG331 belongs to the SG series of inrush current limiters manufactured by Vishay / Ametherm. This product line utilizes SURGE-GARD branded NTC thermistors intended for robust protection in various electrical systems. The component represents a standard solution for managing transient currents in commercial and industrial applications requiring reliable power initialization.

Inrush Current Limiters (ICL) Replacement Considerations

Direct substitutes within the same series include models such as SG339 or SG322, provided their resistance and current ratings align with the design requirements. Verify that any alternative part matches the radial package style and dimensional constraints to ensure compatibility with existing PCB layouts.