Q4008R4TP

Triacs Overview

The Littelfuse Q4008R4TP is a bidirectional triac designed for AC power control applications. It features an RMS on-state current rating of 8 A and a repetitive peak off-state voltage (VDRM) of 400 V. The device operates within a junction temperature range of -40°C to +125°C and utilizes a TO-220-2 package for through-hole mounting. Key electrical characteristics include a maximum holding current of 35 mA, a gate trigger voltage of 1.3 V, and a gate trigger current of 35 mA. The on-state voltage is specified at 1.6 V, with a non-repetitive peak on-state current capability of 83 A or 100 A depending on the pulse width.

Triacs Feature Summary

• Bidirectional switching capability for alternating current circuits
• Robust thermal performance suitable for high-temperature environments up to 125°C
• High surge current handling for inductive load protection

Triacs Applications

• Solid-state relays
• Motor speed control systems
• Lighting dimmers

Triacs Procurement Notes

Verify the specific suffix 'R' against the manufacturer's official datasheet to confirm pinout configuration and gate sensitivity parameters. Ensure the procurement channel provides valid UL certification documentation. Cross-reference the part number with Littelfuse's current product lifecycle status to avoid obsolete components.

Triacs Selection Notes

Select this component when a 400 V blocking voltage and 8 A continuous current are required in a through-hole package. Compare the 35 mA gate trigger requirements against the driving circuit capabilities. Consider the TO-220-2 thermal resistance for heat sink design if operating near maximum current ratings.

Triacs Part Context

This triac belongs to the Qxx08xHx series from Littelfuse, which focuses on high-reliability thyristors. The family shares common electrical profiles but varies by package type and gate characteristics. This specific model targets general-purpose AC switching where standard isolation and moderate power handling are sufficient.

Triacs Replacement Considerations

Potential substitutes include the Q4008L4TP or Q4008RH467TP. Verify that the alternative part matches the 400 V rating, 8 A current capacity, and TO-220-2 footprint. Confirm gate trigger specifications align with the existing control circuit design.