SL322R025-B

Overview

The SL322R025-B is a negative temperature coefficient (NTC) inrush current limiter thermistor manufactured by Vishay Ametherm. It features a nominal resistance of 2 Ohms with a tolerance of ±20%. The device has a steady-state current rating of 25 A and is designed to withstand input energy up to 300 Joules. Physical dimensions include a diameter of 31 mm and a width of 6.3 mm, with radial leads spaced at 7.8 mm apart. The component operates within voltage ratings of 120 VAC and 240 VAC.

Feature Summary

• Designed to limit high inrush currents during power-up sequences
• Capable of absorbing significant input energy without failure
• Provides automatic reset functionality after cooling down

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official datasheet to ensure the correct tolerance and packaging configuration. Confirm that the thermal environment supports the required dissipation factor for reliable operation. Check for RoHS compliance status if environmental regulations apply to the final assembly. Ensure lead spacing matches the target PCB footprint design requirements.

Selection Notes

Select this component based on the required steady-state current and maximum allowable inrush current limits. Evaluate the circuit's input energy levels to ensure they remain below the 300 Joule absorption capacity. Consider the physical size constraints due to the 31 mm diameter. Verify compatibility with the operating voltage range of the application circuit.

Part Context

This part belongs to the SL32 series of MegaSurge inrush current limiters. These components are specialized NTC thermistors engineered for robust circuit protection. The series offers various resistance values and current ratings to suit different power electronics applications. Vishay Ametherm designs these parts for durability in demanding industrial environments.

Replacement Considerations

Direct substitutes may include other Vishay Ametherm SL32 variants with matching electrical parameters. Cross-reference resistance, current rating, and physical dimensions before substitution. Ensure any alternative component meets the same safety certifications and energy absorption capabilities.