SL320R540

Overview

The Vishay Ametherm SL320R540 is a radial leaded inrush current limiter (ICL) designed for PCB mounting. It features a nominal resistance of 0.5 ohms with a tolerance of ±25%. The device supports a maximum steady-state current of 40 amps and can absorb up to 250 joules of energy. At 100% of maximum current, the resistance drops to 0.007 ohms, while at 50% current, it is 0.014 ohms.

Feature Summary

• Provides high energy absorption capacity for robust circuit protection
• Achieves rapid resistance reduction under steady-state operating conditions
• Designed for reliable performance in high-current power applications

Applications

• Power supply input stages
• Industrial motor drives
• High-capacity battery charging systems

Procurement Notes

Verify the specific part number SL320R540 against official Vishay documentation to confirm electrical ratings and physical dimensions. Ensure compatibility with your PCB layout requirements regarding radial lead spacing and mounting style. Cross-reference datasheet specifications for thermal management needs during operation.

Selection Notes

Select this component based on the required 40-amp steady-state current handling capability and 250-joule energy rating. Consider the initial 0.5-ohm resistance value for appropriate inrush limiting. Verify that the radial termination style fits the target printed circuit board design constraints.

Part Context

This component belongs to the SL320 series of inrush current limiters from Vishay Ametherm. These devices utilize negative temperature coefficient (NTC) thermistor technology to protect electronic circuits from damaging surge currents during power-up events.

Replacement Considerations

Consult official Vishay catalogs for direct replacements within the SL320 series or equivalent NTC thermistors from other manufacturers. Ensure substitute parts match the 0.5-ohm resistance, 40-amp current rating, and 250-joule energy absorption specifications.