SL121R308LT

Inrush Current Limiters (ICL) Overview

The SL121R308LT is an inrush current limiter (ICL) from the Vishay Ametherm SL12 series. It features a nominal resistance of 1.3 ohms with a tolerance of ±20% at 25°C. The component supports a maximum steady-state current of 8 amps and has a recommended maximum energy rating of 40 joules. Designed for radial through-hole mounting, it utilizes a 13mm lead length configuration to facilitate integration into power supply circuits requiring surge protection.

Inrush Current Limiters (ICL) Feature Summary

• Provides effective limitation of high inrush currents during initial power application
• Utilizes negative temperature coefficient thermistor technology for automatic resistance adjustment
• Supports continuous operation under specified steady-state current conditions

Inrush Current Limiters (ICL) Applications

• Power supply input stages
• Transformer primary circuit protection
• Capacitive load switching applications

Inrush Current Limiters (ICL) Procurement Notes

Verify the specific ordering suffix LT against official Vishay documentation to confirm lead length and packaging specifications. Ensure that the thermal environment allows for adequate heat dissipation during repeated cycling. Confirm compatibility with the target PCB footprint and lead spacing requirements before finalizing procurement orders.

Inrush Current Limiters (ICL) Selection Notes

Select this component based on the required 1.3-ohm resistance value and 8-amp current capacity. Evaluate the system's peak voltage and capacitance levels to ensure they remain within the 40-joule energy limit. Consider the reset time characteristics relative to the application's duty cycle to prevent thermal saturation during frequent power cycles.

Inrush Current Limiters (ICL) Part Context

This part belongs to the SL12 family of inrush current limiters designed for general-purpose electronic equipment. The series offers various resistance and current ratings to suit different power levels. The SL121R308LT specifically addresses mid-range current applications requiring moderate surge suppression capabilities.

Inrush Current Limiters (ICL) Replacement Considerations

Direct substitutes include other Vishay Ametherm parts within the SL12 series with matching electrical parameters. Cross-manufacturer replacements require verification of resistance tolerance, current rating, and physical dimensions to ensure functional equivalence.