QJ4008DH2TP

Triacs Overview

The Littelfuse QJ4008DH2TP is a bidirectional triac belonging to the Qxx08xH series, designed for AC switching and phase control applications. It features an 8 A RMS on-state current capability and supports rated repetitive off-state voltages of 400 V, 600 V, 800 V, or 1000 V. The device utilizes a TO-252 (D-PAK) surface-mount package with three terminals: Main Terminal 1 (MT1), Main Terminal 2 (MT2), and Gate (G). It operates within a temperature range of -40°C to +150°C and includes glass-passivated junctions for reliability.

Triacs Feature Summary

• Sensitive gate type configuration ensuring reliable control in Quadrants I & IV for digital circuitry compatibility
• High dv/dt commutation performance suitable for circuits requiring robust switching under rapid voltage changes
• Solid-state construction eliminates arcing and contact bounce while restricting RFI generation

Triacs Applications

• AC solid-state switches and static switching relays
• Lighting controls and light dimmers
• Motor speed modulation and temperature control systems

Triacs Procurement Notes

Verify the specific voltage rating suffix required for the design, as the base series supports multiple voltage options. Confirm the package variant matches the TO-252 footprint requirements. Ensure the sensitive gate characteristic aligns with the driving circuit's quadrant operation needs. Check RoHS compliance status against current regulatory standards before finalizing procurement.

Triacs Selection Notes

Select this component when high commutation performance is critical for inductive loads. The sensitive gate option is preferred for digital control interfaces requiring Quadrant I & IV triggering. Evaluate thermal management capabilities given the TO-252 package constraints. Compare surge current ratings against potential inrush conditions in the target application circuit.

Triacs Part Context

This part belongs to the Qxx08xH series of high commutation triacs from Littelfuse. These devices are engineered for AC power control where reliable switching and minimal electromagnetic interference are essential. The series offers various voltage ratings to accommodate different line voltage requirements while maintaining consistent current handling capabilities.

Triacs Replacement Considerations

Direct substitutes include other parts within the Qxx08xH family with matching current and voltage ratings. Verify pinout compatibility (MT1, MT2, G) and package dimensions (TO-252) to ensure mechanical fit. Confirm that the replacement maintains the sensitive gate characteristic if digital control is utilized.