SG15

Inrush Current Limiters (ICL) Overview

The SG15 is a Negative Temperature Coefficient (NTC) thermistor inrush current limiter manufactured by Vishay / Ametherm. Designed for PCB mounting, this component features radial leads with an outside kink configuration to facilitate secure installation. It provides a nominal resistance of 5 Ohms with a tolerance of ±15%, allowing it to handle a steady-state current rating of 1 A. The device is rated for a maximum voltage of 265 VAC and operates within a temperature range of 0°C to +85°C. With a diameter of 0.600 inches (15.24 mm), the SG15 offers UL approval for safety compliance in electronic power circuits.

Inrush Current Limiters (ICL) Feature Summary

• Utilizes NTC ceramic technology to limit high initial charging currents during power-up
• Features outside kinked radial leads for reliable through-hole PCB mounting
• Provides UL approval for enhanced safety certification in power supply applications

Inrush Current Limiters (ICL) Applications

• Protection of switching mode power supplies against inrush current
• Limiting surge currents in AC/DC converter input stages
• Protecting motor drives and transformer circuits from startup stress

Inrush Current Limiters (ICL) Procurement Notes

Verify that the specific order matches the SG15 part number to ensure correct electrical parameters, specifically the 5 Ohm resistance and 1 A current rating. Confirm that the required lead style corresponds to the standard radial kinked configuration documented for this series. Ensure the application environment remains within the specified operating temperature limits of 0°C to +85°C to maintain component integrity and performance stability.

Inrush Current Limiters (ICL) Selection Notes

Select the SG15 when circuit design requires a compact inrush limiter with a 5 Ohm nominal resistance and a 1 A continuous current capacity. This model is suitable for low-power applications where space constraints require a 0.600-inch diameter footprint. Consider the ±15% resistance tolerance and the specific thermal characteristics of the NTC material when designing the protection strategy for sensitive electronic components.

Inrush Current Limiters (ICL) Part Context

The SG15 belongs to the SURGE-GARD series of inrush current limiters produced by Vishay / Ametherm. This product line specializes in NTC thermistors designed to protect electronic equipment from damaging surge currents. The SG15 represents a standard radial lead variant within this family, offering a balance of physical size and electrical performance for general-purpose power supply protection tasks.

Inrush Current Limiters (ICL) Replacement Considerations

When substituting the SG15, verify that alternative components match the 5 Ohm resistance, 1 A current rating, and 265 VAC voltage rating. Ensure the replacement part supports the same radial kinked lead format for compatible PCB mounting. Cross-reference thermal specifications and UL listing status to guarantee equivalent safety and operational performance in the target application.