S4008RS2

Overview

The Littelfuse S4008RS2 is a Silicon Controlled Rectifier (SCR) belonging to the Sxx08xSx series, designed for power control applications. It features an 8 A RMS on-state current rating and supports a repetitive peak off-state voltage of 400 V. The device utilizes a TO-220AB package with a flange mount configuration, providing three terminals: anode, cathode, and gate. Key electrical characteristics include a maximum DC gate trigger current of 0.5 mA and a holding current of 8 mA. The component operates within a temperature range of -40 °C to +110 °C and complies with RoHS standards.

Feature Summary

• High thermal stability suitable for demanding industrial environments
• Sensitive gate triggering capability for efficient control circuits
• Robust mechanical construction via flange mount design

Applications

• Industrial motor speed control systems
• AC power regulation circuits
• Solid-state relay implementations

Procurement Notes

Verify the specific suffix designation against official Littelfuse documentation to confirm exact pinout and thermal interface specifications. Ensure that the procurement channel provides valid traceability records and confirms compliance with current environmental directives such as RoHS. Cross-reference the part number with the manufacturer's latest datasheet to validate availability and production status before finalizing orders.

Selection Notes

Select this component when an 8 A current capacity and 400 V blocking voltage are required in a standard through-hole package. Consider the TO-220AB form factor for ease of heatsinking in high-power density designs. Evaluate the gate trigger sensitivity requirements against the driving circuit capabilities to ensure reliable turn-on performance under varying load conditions.

Part Context

This SCR belongs to the Sxx08xSx family, which groups devices by their 8 A RMS current rating. Variations within this series typically differ by voltage ratings or packaging styles. The S4008RS2 specifically denotes the 400 V variant in the TO-220AB flange mount style, distinguishing it from surface-mount or higher-voltage alternatives in the same product line.

Replacement Considerations

Consult Littelfuse cross-reference guides for direct equivalents. Verify that any substitute maintains identical current, voltage, and thermal specifications. Confirm package compatibility and pinout alignment to ensure seamless integration into existing PCB layouts without redesign.