SL321R030C

Overview

The Vishay Ametherm SL321R030C is a negative temperature coefficient (NTC) thermistor designed as an inrush current limiter. It features a nominal resistance of 1 Ohm at 25°C with a tolerance of ±20%. The component supports a maximum steady-state current of 30 A up to 65°C and can withstand an energy absorption capacity of 160 Joules. It is rated for AC voltages including 265 VAC. The device utilizes a radial leaded package with a maximum diameter of 31 mm.

Feature Summary

• Provides effective suppression of high inrush currents during power-up sequences
• Utilizes NTC thermistor technology for automatic resistance adjustment based on temperature
• Designed for robust performance in radial PCB mount configurations

Applications

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

Procurement Notes

Verify the specific suffix 'C' against the manufacturer's official datasheet to confirm exact dimensional tolerances and marking codes, as suffixes often denote specific packaging or minor mechanical variations. Ensure the selected variant matches the required voltage rating and thermal characteristics for the target application environment.

Selection Notes

Select this component when a 1 Ohm resistance value and 30 Ampere current handling capability are required for inrush limiting. Consider the 160 Joule energy rating for applications involving significant capacitive loads. Verify that the radial lead spacing and physical dimensions fit the available PCB footprint constraints.

Part Context

This part belongs to the SL32 series of inrush current limiters from Vishay Ametherm. The series offers various resistance values and current ratings tailored for different power levels. These components are widely used in industrial and consumer electronics to protect downstream circuitry from initial surge currents.

Replacement Considerations

Direct substitutes include the SL321R030B and SL321R030, provided they meet the same electrical specifications and mechanical mounting requirements. Always cross-reference the latest datasheets to ensure compatibility regarding voltage ratings and thermal performance.