SL1540004

Inrush Current Limiters (ICL) Overview

The SL1540004 is a leaded NTC thermistor inrush current limiter from the Vishay Ametherm SL15 series. It features a 15mm disc size and a nominal resistance of 40 ohms at 25°C. The component supports a maximum steady-state current of 4A up to 65°C and withstands 35 Joules of inrush energy. Electrical specifications include a dissipation factor of 27 mW/°C and a pitch spacing of 4.35 mm. The device is UL approved for use in power supply applications.

Inrush Current Limiters (ICL) Feature Summary

• Provides effective limitation of inrush current to protect switching power supply components
• Utilizes negative temperature coefficient (NTC) characteristics for automatic resistance adjustment
• Constructed as a two-pin through-hole component with axial leads

Inrush Current Limiters (ICL) Applications

• Switching power supplies
• Power electronics input stages
• Electronic equipment requiring surge protection

Inrush Current Limiters (ICL) Procurement Notes

Verify that the specific part number SL1540004 matches the required 40-ohm resistance and 4-ampere current rating for the target circuit design. Confirm that the 15mm package dimensions and 4.35mm pitch spacing are compatible with the printed circuit board layout. Ensure that the thermal management requirements align with the 27 mW/°C dissipation factor and the 65°C maximum operating temperature limit specified by the manufacturer.

Inrush Current Limiters (ICL) Selection Notes

Select this component when a 40-ohm initial resistance is necessary to limit startup currents in low-power applications. The 4A steady-state rating suits circuits where the operating current remains below this threshold. Consider the 35 Joule energy handling capability for systems with moderate capacitive loads. The 15mm form factor provides a compact solution compared to larger industrial limiters while maintaining adequate thermal mass for repeated cycling.

Inrush Current Limiters (ICL) Part Context

This part belongs to the Vishay Ametherm SL15 series of inrush current limiters. The series offers various resistance values and disc sizes, ranging from smaller variants to higher-current options. The SL1540004 represents a mid-range specification within this family, balancing resistance and current capacity for general-purpose consumer and industrial power supplies.

Inrush Current Limiters (ICL) Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing designs before attempting substitution with other NTC thermistors.