SL225R012BT

Overview

The SL225R012BT is a negative temperature coefficient (NTC) thermistor from the Vishay Ametherm SL22 series, designed for inrush current limiting. It features a nominal resistance of 5 Ohms with a tolerance of ±20%. The component has a maximum steady-state current rating of 12 A at 65°C and a peak current capacity of 100 A. Mechanically, it utilizes a radial leaded package with a disc diameter of 22 mm and a width of 12 mm. The leads have a diameter of 1 mm and a spacing of 7.8 mm. It operates within a temperature range of -40°C to +100°C.

Feature Summary

• Provides effective limitation of high inrush currents that can damage components in switching power supplies.
• Features a robust radial leaded construction suitable for through-hole PCB mounting.
• Designed for UL approval compliance in power control applications.

Applications

• Switching power supply input stages
• Power control boxes
• Electronic ballasts

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm mechanical dimensions and electrical tolerances. Ensure the selected variant matches the required steady-state current and peak current ratings for the target circuit design. Cross-reference the datasheet specifications with the intended operating temperature range to validate thermal performance under load conditions.

Selection Notes

Select this component based on the required nominal resistance value and the maximum steady-state current capability of the application. Consider the physical size constraints regarding the 22 mm diameter and lead spacing when designing the PCB layout. Evaluate the thermal dissipation requirements to ensure the device remains within its specified operating temperature limits during continuous operation.

Part Context

This part belongs to the SL22 series of inrush current limiters manufactured by Vishay Ametherm. The series offers various resistance values and current ratings tailored for different power levels. The SL225R012BT specifically addresses applications requiring moderate current handling with a 5 Ohm initial resistance to protect downstream electronics from surge damage.

Replacement Considerations

Consult the official Vishay Ametherm cross-reference data for verified substitute part numbers. Ensure any replacement maintains identical electrical parameters and mechanical footprint compatibility.