SG333

Inrush Current Limiters (ICL) Overview

The SG333 is a negative temperature coefficient (NTC) thermistor from the Vishay Ametherm SURGE-GARD series, designed as an inrush current limiter. It features a nominal resistance of 5 Ohms with a tolerance of ±15% and a steady-state current rating of 12 A. The component supports a maximum voltage of 265 VAC and operates within a temperature range of 0°C to +65°C. Physical dimensions include a diameter of 0.5 inches and a width of 0.35 inches, utilizing radial kinked leads for PCB mounting.

Inrush Current Limiters (ICL) Feature Summary

• Utilizes NTC thermistor technology to limit initial surge currents during power-up
• Features radial kinked lead configuration for secure PCB mounting
• Complies with UL safety standards for approved industrial applications

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 official datasheet to confirm lead style and tolerance requirements. Ensure the selected variant matches the required steady-state current and voltage ratings for the target circuit. Cross-reference the manufacturer part number with authorized distributors to confirm availability and authenticity before finalizing procurement orders.

Inrush Current Limiters (ICL) Selection Notes

Select this component based on the required 5 Ohm resistance value and 12 A current handling capability. Confirm that the 265 VAC rating aligns with the system's maximum operating voltage. Evaluate the physical footprint constraints regarding the 0.5-inch diameter and kinked lead spacing to ensure compatibility with the printed circuit board layout.

Inrush Current Limiters (ICL) Part Context

The SG333 belongs to the SG series of inrush current limiters manufactured by Vishay / Ametherm under the SURGE-GARD trademark. This series provides NTC thermistors specifically engineered for protecting electronic equipment from high initial charging currents. The product line emphasizes reliability and compliance with international safety certifications for widespread industrial use.

Inrush Current Limiters (ICL) Replacement Considerations

Direct substitutes must match the 5 Ohm resistance, 12 A current rating, and radial kinked lead form factor. Verify equivalent UL approval status and thermal characteristics when evaluating alternative components from other manufacturers.