Q4004V4

Triacs Overview

The Littelfuse Q4004V4 is a standard type thyristor designed for AC power control applications. It features a 400V repetitive peak off-state voltage and an RMS on-state current rating of 4A. The device supports non-repetitive surge currents of 46A at 50Hz and 55A at 60Hz. Gate trigger current maximums are specified at 25mA, with a hold current maximum of 30mA. It operates within a junction temperature range of -40°C to +125°C and is housed in a TO-251-3 Short Leads, IPak, or TO-251AA package.

Triacs Feature Summary

• Standard triac configuration suitable for general AC power switching
• Sensitive gate triggering capability for efficient drive circuits
• Robust thermal performance across wide operating temperature ranges

Triacs Applications

• AC power control systems
• Lighting dimmer circuits
• Motor speed control applications

Triacs Procurement Notes

Verify the specific package variant (TO-251-3 Short Leads, IPak, or TO-251AA) required for your PCB layout, as these physical dimensions differ. Confirm that the 25mA gate trigger current aligns with your driver circuit capabilities. Ensure the 400V voltage rating provides adequate margin for your AC line voltage. Check RoHS compliance status if environmental regulations apply to your assembly process.

Triacs Selection Notes

Select this component when a 4A RMS current capacity and 400V blocking voltage are sufficient for the load. The TO-251 package is appropriate for surface mount designs requiring compact footprints. Consider the 25mA gate sensitivity if driving from low-power logic interfaces. Evaluate thermal management requirements based on the 125°C maximum junction temperature limit under continuous operation conditions.

Triacs Part Context

The Q4004V4 belongs to the Teccor brand family of thyristors manufactured by Littelfuse. This series includes sensitive and standard triacs designed for various power control needs. The part is distinct from through-hole variants like the Q4004L4 and high-current SMD versions like the Q4004D4RP, offering a specific balance of current handling and surface mount convenience.

Triacs Replacement Considerations

Cross-reference with other 4A/400V TO-251 triacs from Littelfuse such as the Q4004V4TP if tape-and-reel packaging is preferred. Verify equivalent electrical parameters against competitors' parts to ensure compatibility with existing gate drive circuits and thermal constraints.