SG44

Inrush Current Limiters (ICL) Overview

The SG44 is a SURGE-GARD inrush current limiter manufactured by Vishay / Ametherm. It is an NTC thermistor designed for PCB mounting with radial straight leads. The component features a nominal resistance of 5 Ohms and a maximum steady-state current rating of 8 A. It supports a voltage rating of 265 VAC. Physical dimensions include a diameter of 0.6 inches, width of 0.25 inches, and lead spacing of 0.31 inches. The operating temperature range spans from 0°C to +65°C.

Inrush Current Limiters (ICL) Feature Summary

• Provides effective suppression of high inrush currents during power-up sequences
• Utilizes negative temperature coefficient characteristics for automatic resistance adjustment
• Designed for reliable surface-mount or through-hole PCB integration

Inrush Current Limiters (ICL) Applications

• Power supply input stages
• Electronic equipment protection circuits
• Consumer appliance power inputs

Inrush Current Limiters (ICL) Procurement Notes

Verify the specific electrical ratings against the official Vishay / Ametherm datasheet before implementation. Confirm that the ambient operating conditions remain within the specified 0°C to +65°C range. Ensure the PCB layout accommodates the radial lead spacing and physical footprint dimensions accurately. Cross-reference the voltage and current requirements with the system design specifications to guarantee safe operation under all expected load conditions.

Inrush Current Limiters (ICL) Selection Notes

Select this component when the application requires limiting surge currents in AC mains-powered devices. The 5 Ohm resistance value is suitable for moderate current loads up to 8 A. Consider the thermal environment carefully, as the device self-heats during operation. Verify compatibility with the target PCB hole spacing and soldering process. This part is appropriate for general-purpose inrush protection where compact size and standard lead styles are required.

Inrush Current Limiters (ICL) Part Context

The SG44 belongs to the SURGE-GARD series of inrush current limiters produced by Vishay / Ametherm. This series specializes in NTC thermistors engineered to protect sensitive electronic components from damaging startup currents. The SG44 specifically targets applications requiring robust protection in compact form factors with radial lead termination.

Inrush Current Limiters (ICL) Replacement Considerations

No public confirmed substitute part numbers are available.