Littelfuse Thyristor SCR 400 V 40 A 40 mA 520 A Peak Current TO-220 Package S8040R

Littelfuse S8040R Thyristor SCR is a solid-state silicon controlled rectifier designed for industrial and commercial phase control applications requiring reliable switching of high current loads.

This device features a TO-220 package optimized for through-hole mounting on PCBs. Its maximum repetitive peak reverse voltage is rated at 400 V, with an average on-state current of 40 A, and a surge current capacity up to 520 A allowing it to handle transient overloads effectively.

The S8040R model exhibits a sensitive gate trigger current of 40 mA, enabling efficient triggering with low gate drive power. It provides robust gate control with a maximum gate trigger voltage of 1.5 V and a maximum holding current of 60 mA. The device operates reliably across a broad temperature range from -40°C to 125°C, making it suitable for demanding environments.

Typical applications include phase control for heaters and motor speed regulation, where this thyristor acts as a bistable switch to conduct during forward bias once triggered by the gate. The peak on-state voltage is 1.8 V, which ensures efficient conduction with minimal power dissipation.

High surge current tolerance enables handling of load surges without damage. Optimized TO-220 package supports thermal management and mechanical stability. Wide operational temperature range for versatile industrial environments.

Low leakage currents enhance energy efficiency during off-state. Sensitive gate triggering facilitates low-power control circuit design. Designed for phase control and power regulation applications. Manufactured in China.

This Littelfuse thyristor is ideally suited for industrial equipment, HVAC systems, motor controls, laboratory instruments, and various electrical control circuits requiring reliable solid-state switching components.

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