Q4008DH3RP

Triacs Overview

The Littelfuse Q4008DH3RP is a high-sensitivity gate triac belonging to the Qxx08xHx series, designed for AC switching and phase control applications. It features an RMS on-state current of 8 A and a rated repetitive peak off-state voltage (VDRM) of 400 V. The device utilizes a TO-252-3 (D2PAK) surface-mount package with three leads. Key electrical parameters include a maximum holding current of 35 mA, a gate trigger voltage of 1.3 V, and a gate trigger current of 35 mA. It operates within a temperature range of -40°C to +125°C.

Triacs Feature Summary

• High sensitivity gate structure enabling reliable triggering with low gate drive power requirements.
• Integrated diac functionality within the package eliminates the need for external discrete components in certain configurations.
• Surface-mount construction facilitates automated assembly and compact PCB layout.

Triacs Applications

• AC motor speed controls
• Lighting dimmer circuits
• Temperature modulation controllers

Triacs Procurement Notes

Verify the specific suffix 'H3' against official Littelfuse documentation to confirm pinout and electrical characteristics, as variations exist within the Q4008 family. Ensure compatibility with RoHS directives if required by the target application. Cross-reference datasheets for thermal resistance values during integration planning.

Triacs Selection Notes

Select this component when a surface-mount triac with 8A capacity and 400V blocking voltage is required. The high-sensitivity gate (35mA IGT) allows for direct interfacing with low-power logic or microcontrollers without additional amplification stages. Consider the TO-252-3 package constraints for thermal management and board space.

Triacs Part Context

This part belongs to the Littelfuse Teccor Q4008 series of Quadracs, which integrate a triac and a diac trigger into a single package. This integration simplifies circuit design for AC phase control by removing the need for separate diac components and associated assembly steps, offering a cost-effective solution for noise-immune switching applications.

Triacs Replacement Considerations

Direct replacements may include other Q4008 series variants such as Q4008NH4RP or Q4008RH467TP, provided the package type and electrical ratings match the design requirements. Verify that substitute parts maintain the same high-sensitivity gate characteristics and thermal performance specifications.