Q4006LT55

Triacs Overview

The Littelfuse Q4006LT55 is a Teccor brand Quadrac device, which integrates a triac and a diac trigger within a single package. This component functions as a bidirectional AC switch with gate control for either polarity of main terminal voltage. It is designed for AC switching and phase control applications requiring noise immunity. The device features glass-passivated junctions to ensure long-term reliability and parameter stability. It eliminates the need for external discrete diacs, simplifying assembly and reducing costs in lighting controls, speed controls, and temperature modulation systems.

Triacs Feature Summary

• Integrates a triac and a diac trigger inside one package to save assembly time and expense
• Provides bidirectional AC switching capability controlled by gate signal for either main terminal voltage polarity
• Features glass-passivated junctions to ensure long-term device reliability and parameter stability

Triacs Applications

• Lighting controls where noise immunity is required
• Speed controls for AC motors
• Temperature modulation controls

Triacs Procurement Notes

Verify the specific suffix LT55 against the manufacturer's current datasheet to confirm pinout and packaging details. Ensure the design accounts for the integrated diac characteristics rather than using a discrete component. Confirm RoHS compliance status if required by the target market regulations before finalizing procurement.

Triacs Selection Notes

Select this part when a combined triac-diac solution is needed to simplify circuit layout and reduce component count. It is suitable for applications requiring noise immunity in AC phase control. Consider the TO-220 package isolation requirements and thermal management needs based on the expected on-state current and ambient operating conditions.

Triacs Part Context

This component belongs to the Teccor Quadrac series developed by Littelfuse. These devices are specifically engineered to replace separate triac and diac assemblies. The series offers various current ratings from 4A to 15A and voltage ranges from 200V to 600V, providing flexibility for different AC power control applications while maintaining high reliability through glass-passivated technology.

Triacs Replacement Considerations

Direct replacement requires verifying that the substitute part also integrates a diac. Standard triacs cannot replace this device without adding an external diac. Check if the alternative offers similar dv/dt ratings and gate trigger characteristics to maintain circuit performance.