S4X8ESAP

Overview

The S4X8ESAP is a sensitive gate silicon controlled rectifier (SCR) from Littelfuse’s EV Series, designed for low-power applications. It features an 800 mA average on-state current and a repetitive peak reverse voltage of 800 V. The device utilizes a TO-92 through-hole package and supports junction temperatures up to +150°C. With a surge current capability of 100 A, it provides robust protection in compact circuits requiring reliable switching performance.

Feature Summary

• Sensitive gate architecture for efficient triggering with low gate current requirements
• Glass-passivated junctions ensuring durability and reliability in harsh environments
• High thermal stability supporting operation at elevated junction temperatures

Applications

• Ground Fault Circuit Interrupter (GFCI) devices
• Gas ignition systems
• Low-power thyristor control circuits

Procurement Notes

Verify the specific ordering suffix 'S' against the official Littelfuse datasheet to confirm the exact electrical characteristics and package variant. Ensure the procurement channel sources directly from authorized distributors to guarantee component authenticity and traceability. Cross-reference the part number with the latest revision history to avoid discrepancies in specifications or compliance status.

Selection Notes

Select this component for applications requiring a compact, through-hole SCR with high blocking voltage and moderate current handling. The sensitive gate feature simplifies drive circuit design by reducing required trigger power. Consider the TO-92 package constraints for thermal management and PCB space limitations when integrating into GFCI or ignition modules.

Part Context

This device belongs to the Littelfuse EV Series, a line of thyristors optimized for energy-efficient and safety-critical applications. The series emphasizes reliability through glass-passivation technology. The S4X8ESAP specifically targets markets demanding robust protection and precise control in small form-factor electronic assemblies.

Replacement Considerations

Consult the official Littelfuse replacement guide for verified cross-references. Generic substitutes may lack the specific sensitive gate characteristics or glass-passivation benefits. Verify that any alternative maintains the 800V rating and TO-92 footprint to ensure mechanical and electrical compatibility.

FAQ

What type of gate trigger does the S4X8ESAP utilize?

It employs a sensitive gate structure, allowing for effective triggering with lower gate currents compared to standard SCRs.

Is the junction passivation relevant for environmental resistance?

Yes, all SCR junctions in this series are glass-passivated to enhance durability and protect against environmental stressors.