Q4004L356

Triacs Overview

The Littelfuse Q4004L356 is a Quadrac device, which integrates a triac and a diac trigger within a single TO-220 package. It serves as a bidirectional AC switch with gate control for either polarity of main terminal voltage. The component features an on-state RMS current rating of 4 A and a repetitive peak off-state voltage (VDRM) of 400 V. Key electrical parameters include a maximum gate trigger current (Igt) of 10 mA, a maximum gate trigger voltage (Vgt) of 1.3 V, and a surge current rating of 55 A at 60 Hz. The device operates within a temperature range of -40°C to +125°C and has a peak on-state voltage of 1.6 V.

Triacs Feature Summary

• Integrated Diac Trigger: Combines a triac and diac in one package to eliminate the need for discrete components and assembly time.
• Electrical Isolation: The TO-220 package provides 2500 V rms isolation from leads to the mounting surface, removing the requirement for external insulators.
• Noise Immunity: Designed for AC switching and phase control applications where noise immunity is critical.
• Glass-Passivated Junctions: Utilizes glass-passivated junctions to ensure long-term device reliability and parameter stability.

Triacs Applications

• Speed controls
• Temperature modulation controls
• Lighting controls

Triacs Procurement Notes

Verify the specific suffix '56' against official Littelfuse documentation, as standard listings typically use 'TP'. Confirm that the requested variant matches the standard 4A/400V specifications. Ensure the TO-220 package type aligns with thermal requirements. Check for RoHS compliance status in the latest datasheet. Validate pinout compatibility before integration.

Triacs Selection Notes

Select this component for AC phase control circuits requiring integrated triggering. The 4A rating suits moderate power loads. The 400V voltage class is appropriate for lower voltage AC systems. Consider the 2500V isolation benefit for safety-critical designs. Evaluate thermal management needs given the 125°C maximum operating temperature limit.

Triacs Part Context

This part belongs to the Teccor QxxxxLTx series of Quadrac devices developed by Littelfuse. These devices are designed to simplify circuit design by replacing separate triac and diac assemblies. The series offers current capacities ranging from 4A to 15A and voltage ratings from 200V to 600V, all housed in electrically isolated TO-220 packages.

Triacs Replacement Considerations

Standard equivalents include the Q4004L3TP. Verify if the '56' suffix denotes a specific tape-and-reel or packaging variation rather than a functional change. Cross-reference gate trigger characteristics with other 4A Quadrac devices if sourcing alternatives.