SG304

Inrush Current Limiters (ICL) Overview

The SG304 is a negative temperature coefficient (NTC) thermistor from the Vishay Ametherm SURGE-GARD series, designed as an inrush current limiter for printed circuit board mounting. It features radial leads with a kinked configuration to facilitate secure PCB installation and mechanical strain relief. The component has a nominal resistance of 2.5 Ohms with a tolerance of ±15%, rated for a continuous current of 7 A and a maximum voltage of 265 VAC. Physical dimensions include a diameter of 0.6 inches (15.24 mm), a width of 0.25 inches, and a lead spacing of 0.31 inches. It operates within a temperature range of 0°C to +65°C.

Inrush Current Limiters (ICL) Feature Summary

• Utilizes NTC thermistor technology to limit high initial charging currents during power-up cycles.
• Features kinked radial leads designed for reliable through-hole PCB mounting and mechanical stability.
• Complies with UL safety standards for use in electronic equipment power supplies.

Inrush Current Limiters (ICL) Applications

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

Inrush Current Limiters (ICL) Procurement Notes

Verify the specific ordering suffix against the manufacturer's official datasheet to ensure the correct lead configuration and packaging format. Confirm that the selected variant meets the required voltage and current ratings for the target application. Cross-reference the part number with authorized distributors to validate authenticity and traceability. Ensure compliance with RoHS directives if applicable to the end product requirements.

Inrush Current Limiters (ICL) Selection Notes

Select this component based on the required steady-state resistance and peak current handling capabilities. Ensure the physical footprint matches the PCB layout constraints, particularly the lead spacing and body diameter. Verify that the operating temperature range aligns with the environmental conditions of the final assembly. Consider the thermal time constant relative to the duty cycle of the application.

Inrush Current Limiters (ICL) Part Context

The SG304 belongs to the SURGE-GARD family of inrush current limiters manufactured by Vishay Ametherm. This series specializes in NTC thermistors engineered to protect sensitive electronic components from damage caused by high surge currents during system startup. The SG model line typically offers various resistance and current ratings to suit different power levels.

Inrush Current Limiters (ICL) Replacement Considerations

Direct substitutes must match the 2.5 Ohm resistance, 7 A current rating, and kinked lead style. Check equivalent parts from other manufacturers for compatible voltage ratings and physical dimensions.