EC103D275

Overview

The Littelfuse EC103D275 is a silicon controlled rectifier (SCR) designed for sensitive gate triggering applications. It features a maximum repetitive off-state voltage of 400 V and an on-state RMS current rating of 800 mA. The device requires a maximum gate trigger current of 50 µA and a gate trigger voltage of up to 800 mV for activation. It exhibits a maximum forward voltage drop of 1.7 V in the conducting state and maintains a low off-state leakage current of 1 µA at rated voltage. The component operates within a temperature range starting from -65 °C.

Feature Summary

• Sensitive gate architecture enabling reliable triggering with minimal gate current input
• Robust thermal performance supporting operation in low-temperature environments down to -65 °C
• Compact through-hole packaging suitable for standard PCB mounting processes

Applications

• Lighting control circuits requiring precise phase-angle dimming
• Solid-state relay inputs for low-power switching applications
• General-purpose AC power control systems

Procurement Notes

Verify the specific suffix designation against the manufacturer's official datasheet to confirm exact electrical tolerances and package variations. Ensure that the selected variant matches the required gate sensitivity specifications for the target circuit design. Cross-reference the ordering number with Littelfuse documentation to avoid confusion between similar series components.

Selection Notes

Select this component when the application demands a low-current gate trigger source to minimize driver complexity. The 400 V blocking capability suits medium-voltage AC loads, while the 800 mA current rating limits usage to smaller power devices. Evaluate the thermal management requirements based on the TO-92 package constraints and ambient operating conditions.

Part Context

This SCR belongs to the EC103xx series, which focuses on sensitive gate thyristors for consumer and industrial electronics. The series provides a balance of high voltage blocking and low gate drive requirements. It serves as a fundamental switching element in AC control topologies where efficiency and cost-effectiveness are prioritized over high-power handling capabilities.

Replacement Considerations

Consult Littelfuse official substitution guides for verified equivalents. Generic replacements may differ in gate trigger sensitivity or thermal characteristics.