Q4015LTH

Triacs Overview

The Littelfuse Q4015LTH is a Quadrac device, which integrates a triac and a diac trigger within a single package. It functions as a bidirectional AC switch controlled by gate polarity for main terminal voltage of either polarity. The component belongs to the Teccor brand QxxxxLTx series and features glass-passivated junctions for parameter stability. It is housed in an electrically isolated TO-220 package, rated at 2500V rms isolation from leads to mounting surface. Key electrical parameters include a 400V blocking voltage, 15A on-state current, and 1.6V on-state voltage.

Triacs Feature Summary

• Integrated Diac Trigger: Combines a triac and diac in one package to eliminate discrete assembly.
• Snubberless Operation: Eliminates the need for external snubber networks.
• High Isolation: Provides 2500V rms electrical isolation between leads and mounting surface.

Triacs Applications

• AC switching and phase control applications
• Speed controls
• Temperature modulation controls
• Lighting controls requiring noise immunity

Triacs Procurement Notes

Verify the specific suffix 'LTH' against official Littelfuse documentation to confirm snubberless operation versus standard LTTP variants. Ensure the required 2500V rms isolation rating meets system safety standards. Confirm RoHS compliance status through the manufacturer's latest environmental declaration before finalizing procurement.

Triacs Selection Notes

Select this component when integrated gate triggering and snubberless design are required. The TO-220 package supports high thermal dissipation. Verify that the 400V voltage rating and 15A current capacity align with the load requirements. Consider the 2500V rms isolation benefit for applications needing direct mounting to heatsinks without separate insulators.

Triacs Part Context

The Q4015LTH is part of the Teccor Quadrac family developed by Littelfuse. These devices replace traditional gated triacs paired with discrete diacs. The QxxxxLTx series offers current capacities from 4A to 15A and voltage ranges from 200V to 600V. This integration simplifies circuit design and reduces assembly costs.

Triacs Replacement Considerations

Standard Triacs like the BT139 require external diacs and snubbers. Direct replacement requires adding these components. For equivalent integrated functionality, verify other Quadrac models in the QxxxxLTx series with matching voltage and current ratings.