SL322R025B

Overview

The SL322R025B is a radial leaded inrush current limiter from the SL32 series, manufactured by Vishay Ametherm. It features a 32 mm diameter body with a nominal resistance of 2 Ohms and a tolerance of ±20%. The component is rated for a steady-state current of 25 A and operates at voltage ratings of 115 VAC or 230 VAC. Key thermal characteristics include a maximum body temperature of 236 °C at rated current, a dissipation constant of 45.4 mW/°C, and a thermal time constant of 194 seconds.

Feature Summary

• Utilizes NTC thermistor technology to provide high initial resistance that decreases as temperature rises during operation.
• Designed with kinked radial leads to facilitate secure PCB mounting and mechanical stability.
• Engineered to withstand high thermal energy without degradation during repeated power-up cycles.

Applications

• Protection of switching power supplies against high capacitive load currents.
• Inrush current limiting for AC mains powered electronic equipment.
• Safeguarding components in motor drive circuits during startup.

Procurement Notes

Verify the specific ordering suffix to confirm lead configuration and packaging details. Ensure the selected variant matches the required voltage rating and current capacity for the target application. Cross-reference the manufacturer datasheet for precise thermal derating curves and soldering recommendations to maintain reliability.

Selection Notes

Select this component based on the circuit's peak inrush current requirements and the steady-state operating current. The 2 Ohm resistance value must be sufficient to limit the initial surge while allowing normal operation. Consider the thermal time constant and dissipation constant to ensure the device can handle the frequency of power cycles without overheating.

Part Context

This part belongs to the SL32 series of inrush current limiters, characterized by a 32 mm body diameter. The series offers various resistance and current ratings to suit different power levels. Vishay Ametherm produces these components using specialized ceramic materials optimized for high-energy absorption and long-term stability in demanding electrical environments.

Replacement Considerations

Direct substitutes within the same series include parts with matching 32 mm dimensions and similar electrical parameters. Verify that any replacement maintains the 2 Ohm nominal resistance and 25 A current rating. Ensure the alternative component supports the same 115 VAC/230 VAC voltage ratings and utilizes compatible radial kinked leads for PCB integration.