SG38

Inrush Current Limiters (ICL) Overview

The SG38 is a negative temperature coefficient (NTC) thermistor inrush current limiter from the Vishay Ametherm SURGE-GARD series. It features radial leads for PCB mounting and operates within a temperature range of 0°C to +65°C. The component has a resistance of 30 Ohms with a tolerance of ±15%, rated for a continuous current of 3 A and a voltage of 265 VAC. Physical dimensions include a diameter of 0.600 inches (15.24 mm).

Inrush Current Limiters (ICL) Feature Summary

• Utilizes NTC thermistor technology to limit initial surge currents during power-up.
• Designed for direct printed circuit board mounting via radial leads.
• Rated for operation at standard AC line voltages up to 265 VAC.

Inrush Current Limiters (ICL) Applications

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

Inrush Current Limiters (ICL) Procurement Notes

Verify the specific datasheet version for the SG38 model before procurement, as manufacturing specifications may be subject to change. Confirm that the 30 Ohm resistance and 3 A current rating align with the target circuit's surge requirements. Ensure the PCB footprint matches the radial lead spacing and physical diameter of 15.24 mm to guarantee proper mechanical installation and thermal performance.

Inrush Current Limiters (ICL) Selection Notes

Select the SG38 when the application requires a 30 Ohm cold resistance to effectively dampen inrush currents without excessive steady-state power loss. The 3 A current rating suits moderate-power loads where peak startup currents exceed normal operating levels. Consider the ±15% tolerance for circuit design margins. This component is appropriate for systems operating within the specified ambient temperature range and requiring robust surge protection at the input stage.

Inrush Current Limiters (ICL) Part Context

The SG38 belongs to the SURGE-GARD product line by Vishay Ametherm, specialized in protecting sensitive electronic components from damaging transient currents. As an NTC thermistor, it provides high resistance at low temperatures which decreases as it heats up during operation. This family of components is widely used in consumer electronics and industrial equipment to extend component lifespan by mitigating electrical stress during switch-on events.

Inrush Current Limiters (ICL) Replacement Considerations

Direct substitutes must match the 30 Ohm resistance, 3 A current rating, and 15.24 mm diameter. Verify compatibility with similar Vishay Ametherm parts or other manufacturers offering equivalent NTC inrush limiters with identical electrical characteristics and mounting configurations.