Q4008DH4TP

Triacs Overview

The Littelfuse Q4008DH4TP is a bidirectional triac from the Qxx08xHx series, designed for AC switching and phase control. 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-252-3 surface-mount package. Key electrical parameters include a maximum holding current (Ih) of 35 mA, a gate trigger voltage (Vgt) of 1.3 V, and a gate trigger current (Igt) of 35 mA. The non-repetitive peak on-state current is specified as 80 A or 85 A, with an on-state voltage of 1.6 V and a leakage current of 10 uA at VDRM.

Triacs Feature Summary

• Sensitive gate type operation suitable for digital control circuitry in Quadrants I & IV
• High commutation capability characteristic of Alternistor devices
• Surface-mount construction for automated assembly

Triacs Applications

• Motor speed modulation controls
• Temperature modulation controls
• Lighting controls
• Static switching relays

Triacs Procurement Notes

Verify component authenticity by cross-referencing the manufacturer part number Q4008DH4TP with official Littelfuse documentation. Confirm compliance status via RoHS and REACH-SVHC declarations provided in the datasheet. Ensure the TO-252-3 package matches design requirements. Validate that the sensitive gate specifications align with the driving circuit's output capabilities before finalizing procurement.

Triacs Selection Notes

Select this component when a 400 V blocking voltage and 8 A continuous current are required in a compact surface-mount form factor. The sensitive gate specification (1.3 V / 35 mA) allows direct interfacing with low-power logic outputs without additional amplification. Consider the thermal management needs associated with the TO-252-3 package for the intended application environment.

Triacs Part Context

This triac belongs to the Qxx08xHx series, which includes variants like Q4008NH4RP and Q4008RH467TP. While sharing similar electrical ratings such as 8 A current and 400 V voltage, these alternatives differ in packaging, such as SMTO-263-2 or TO-220-3, and mounting styles including through-hole options. The Q4008DH4TP specifically denotes the surface-mount TO-252-3 configuration within this family.

Triacs Replacement Considerations

Q4008DH4 is a leaded equivalent in the same TO-252 package. Q4008NH4RP offers identical electrical performance but uses an SMTO-263-2 reel package. Q4008RH467TP provides through-hole TO-220-3 mounting. Verify pinout compatibility and thermal dissipation characteristics when substituting.