Q4006VH4

Triacs Overview

The Littelfuse Q4006VH4 is a standard gate triac designed for AC power control applications. It features a 6 A RMS on-state current and a 400 V repetitive peak off-state voltage rating. The device utilizes a sensitive gate structure, enabling reliable triggering with low gate current requirements across all four quadrants of operation. Packaged in a surface-mount TO-252 (DPAK) form factor, it supports automated assembly processes. Key electrical characteristics include a maximum holding current of 35 mA and a typical on-state voltage drop of 1.6 V at rated current. The component operates within a junction temperature range of -40°C to +125°C.

Triacs Feature Summary

• Four-quadrant sensitivity ensures reliable triggering from digital logic circuits using positive or negative gate pulses.
• Surface-mount TO-252 package design facilitates high-volume automated PCB assembly and compact layout.
• Glass-passivated junction construction provides enhanced parameter stability and long-term reliability under thermal stress.

Triacs Applications

• Solid-state relay modules requiring compact switching elements
• AC motor speed control circuits for household appliances
• Lighting dimmer switches and phase-control regulators

Triacs Procurement Notes

Verify the specific suffix 'H4' against the manufacturer's latest datasheet to confirm pinout orientation and marking codes, as variations exist within the Q4006 family. Ensure the procurement channel provides traceable documentation confirming RoHS compliance status. Cross-reference the ordering part number with Littelfuse official catalogs to distinguish between standard gate and sensitive gate variants, as functional differences impact circuit design compatibility.

Triacs Selection Notes

Select this component when a robust surface-mount solution is required for moderate power AC loads up to 6 Amperes. The 400 V voltage rating suits general-purpose mains applications where higher breakdown voltages are unnecessary. Consider the thermal resistance of the TO-252 package relative to the expected duty cycle; continuous high-current operation may require adequate copper area on the PCB for heat dissipation. Verify that the gate drive circuit can supply sufficient current to meet the specified trigger requirements across the full operating temperature range.

Triacs Part Context

This device belongs to the Teccor Qxx06xxH series of standard and sensitive gate triacs manufactured by Littelfuse. The series is engineered for cost-effective AC power switching in consumer electronics and industrial controls. These components replace traditional mechanical relays in applications demanding silent operation and extended service life. The Q4006VH4 specifically addresses the need for reliable four-quadrant gating in space-constrained designs.

Triacs Replacement Considerations

Direct replacements must match the 6 A current rating, 400 V blocking voltage, and TO-252 package outline. Verify that substitute parts offer equivalent four-quadrant sensitivity if driven by digital logic. Check for identical pin configuration to ensure board compatibility without redesign.