SG110

Inrush Current Limiters (ICL) Overview

The Vishay Ametherm SG110 is a radial lead Negative Temperature Coefficient (NTC) thermistor designed as an inrush current limiter. It features a nominal resistance of 2 Ohms at +25°C with a tolerance of ±15%. The component supports a maximum steady-state current of 18 A and operates within a voltage rating of 265 VAC. It has a disc diameter of 0.9 inches (22.86 mm) and a lead spacing of 0.31 inches (7.87 mm). The unit functions effectively between 0°C and +65°C, utilizing a bulk packaging format for surface or through-hole integration.

Inrush Current Limiters (ICL) Feature Summary

• Utilizes NTC thermistor technology to limit initial surge currents during power-up
• Provides robust protection against high inrush currents in AC line applications
• Features UL and CSA certification for safety compliance in electronic circuits

Inrush Current Limiters (ICL) Applications

• Power supply input stages
• Transformer primary windings
• Capacitor charging circuits

Inrush Current Limiters (ICL) Procurement Notes

Verify the specific ordering suffix to confirm lead type and tolerance variations, as the base part number may encompass multiple physical configurations. Confirm that the required steady-state current does not exceed the 18 A rating under worst-case operating conditions. Ensure the ambient temperature range remains within the specified 0°C to +65°C limits to prevent thermal runaway or insufficient limiting performance. Cross-reference the datasheet for energy absorption capabilities relative to the specific circuit capacitance.

Inrush Current Limiters (ICL) Selection Notes

Select this component when the circuit requires a 2 Ohm cold resistance to adequately limit peak inrush current while maintaining low heat dissipation during normal operation. The 18 A steady-state rating suits moderate-power AC applications. Consider the radial lead configuration for standard PCB mounting or wire-wrapping. Evaluate the thermal time constant to ensure the device resets appropriately between power cycles if frequent switching is expected.

Inrush Current Limiters (ICL) Part Context

The SG110 belongs to the SURGE-GARD series of inrush current limiters manufactured by Vishay Ametherm. This series utilizes sintered ceramic NTC materials optimized for AC line protection. The component serves as a passive protective element, replacing traditional fuses or mechanical relays in many low-to-medium power scenarios where cost-effective surge suppression is prioritized.

Inrush Current Limiters (ICL) Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.