SL321R030B

Overview

The Vishay Ametherm SL321R030B is a radial lead NTC inrush current limiter with a nominal resistance of 1 Ohm and a tolerance of ±20%. It supports steady-state currents up to 30 A at 65 °C and withstands inrush energy of 160 Joules. Rated voltages include 265 VAC, with options for 120 VAC, 240 VAC, 480 VAC, and 680 VAC. The component features a 31 mm diameter and 9.5 mm lead spacing.

Feature Summary

• Radial lead construction for through-hole PCB mounting
• NTC thermistor technology for automatic inrush current suppression
• High thermal stability with low dissipation factor

Applications

• Power supply input stages
• Transformer protection circuits
• Motor drive systems

Procurement Notes

Verify the specific voltage rating required for your application against the datasheet options (e.g., 265 VAC vs 680 VAC). Confirm that the 30 A steady-state current and 160 J energy absorption capabilities meet the system's peak load requirements. Ensure the 31 mm diameter and 9.5 mm lead pitch are compatible with the PCB layout constraints.

Selection Notes

Select this component when a 1 Ohm resistance is needed to limit initial charging currents. The 30 A rating suits moderate power applications. Consider the physical dimensions (31 mm diameter) for board space allocation. Verify the operating temperature range to ensure performance stability under expected environmental conditions.

Part Context

This part belongs to the SL32 series of inrush current limiters from Vishay Ametherm. These components are designed specifically to protect electronic equipment from high surge currents during power-up. The series offers various resistance and current ratings to match different power supply designs.

Replacement Considerations

The AS321R030 is a comparable alternative within the same manufacturer's portfolio. Both parts share similar electrical characteristics but may differ in mechanical dimensions or specific voltage ratings. Always cross-reference the datasheets before substitution.