S4025L

Overview

The Littelfuse S4025L is a Silicon Controlled Rectifier (SCR) designed for half-wave, unidirectional gate-controlled rectification. It features a single element configuration housed in an electrically isolated TO-220AB flange mount package with three pins. The device supports a maximum repetitive peak reverse voltage and maximum DC blocking voltage of 400V. It handles a root-mean-square on-state current of 25A. The component utilizes glass-passivated junction technology to ensure parameter stability and long-term reliability under high-voltage and high-surge conditions.

Feature Summary

• Electrically isolated package design eliminates the need for external insulators
• Glass-passivated chip construction ensures long-term device reliability
• High surge current capability for robust power control applications

Applications

• AC switching circuits
• Phase control systems
• Industrial motor controls

Procurement Notes

Verify the manufacturer origin, as Teccor Electronics is the specific brand line within Littelfuse. Confirm RoHS compliance status and lead-free finish specifications against the latest datasheet revision. Ensure the TO-220AB package variant matches the required mounting constraints for the target assembly.

Selection Notes

Select this component when a 400V blocking voltage and 25A continuous current rating are required in a standard through-hole isolation package. Consider the gate trigger current limits if driving from low-power logic. Evaluate thermal management requirements for the flange mount configuration based on the expected RMS current load.

Part Context

This SCR belongs to the Teccor line of thyristors, which complements sensitive gate devices with higher current ratings. The family spans from 1A to 70A with voltages up to 1000V. The S4025L specifically addresses mid-range power applications requiring non-sensitive gate drive characteristics and robust isolation.

Replacement Considerations

Cross-reference with other 400V, 25A SCRs in the TO-220AB package. Verify that substitute parts match the electrical isolation requirements and thermal resistance characteristics. Check for equivalent gate trigger specifications to ensure circuit compatibility.