Q4008L4TP

Triacs Overview

The Littelfuse Q4008L4TP is a bidirectional triac from the Qxx08xx series, designed for AC switching and phase control applications. It features an 8 A RMS on-state current (It RMS) and a rated repetitive off-state voltage (VDRM) of 400 V. The device operates within a temperature range of -40 °C to +125 °C and utilizes a TO-220-2 through-hole package. Key electrical parameters include a maximum holding current (Ih) of 50 mA, a gate trigger voltage (Vgt) of 2.5 V, and a gate trigger current (Igt) ranging from 25 mA to 50 mA. It exhibits an on-state voltage of 1.6 V and a non-repetitive peak on-state current capability of 83 A or 100 A.

Triacs Feature Summary

• Sensitive gate type ensuring reliable control in quadrants I & IV for digital circuitry compatibility
• Glass-passivated junctions provide long-term parameter stability and device reliability
• Electrically isolated TO-220 package eliminates the need for external insulators

Triacs Applications

• AC solid-state switches
• Light dimmers
• Motor speed controls
• Temperature modulation controls

Triacs Procurement Notes

Verify the specific datasheet revision and RoHS compliance status before integration. Confirm that the TO-220-2 package isolation rating meets system safety requirements. Ensure gate drive circuits can supply the required 25 mA to 50 mA trigger current under all operating conditions.

Triacs Selection Notes

Select this component for applications requiring 400 V blocking capability and 8 A continuous load current. The sensitive gate characteristic makes it suitable for direct interface with digital logic without additional complex triggering networks. Consider thermal management solutions given the 125 °C maximum junction temperature limit.

Triacs Part Context

This part belongs to the Qxx08xx series of 8 Amp bidirectional solid-state switches. The series is engineered for AC switching and phase control, offering high surge capability up to 100 A. These devices are recognized by UL as electrically isolated semiconductor devices under standard UL 1557.

Triacs Replacement Considerations

Check for equivalent parts within the Lxx08xx or Qxx08xHx series if different voltage ratings or snubber requirements apply. Verify pinout compatibility for TO-220-2 packages when substituting.