Q2004LT

Triacs Overview

The Littelfuse Q2004LT is a Quadrac device, which integrates a triac and an internal diac trigger within a single package. It serves as a bidirectional AC switch controlled by the gate for either polarity of main terminal voltage. The component features glass-passivated junctions for reliability and an electrically isolated TO-220 package rated at 2500V rms isolation between leads and mounting surface. It supports on-state currents from 4A to 15A with voltage capabilities up to 600V. The design eliminates the need for external snubber networks in alternistor variants and provides high surge capability.

Triacs Feature Summary

• Integrates a diac trigger inside the same package as the triac to save assembly time and expense
• Electrically isolated package providing 2500V rms isolation without external insulators
• Glass-passivated junctions ensure long-term device reliability and parameter stability
• Bidirectional AC switching capability with gate control for either polarity of main terminal voltage

Triacs Applications

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

Triacs Procurement Notes

Verify the specific datasheet version and RoHS compliance status directly with Littelfuse or authorized distributors, as product specifications may evolve. Confirm package availability and lead times through official supply chain channels. Ensure the selected variant matches the required voltage and current ratings for the intended circuit design before procurement.

Triacs Selection Notes

Select the Q2004LT when a compact solution for AC phase control is needed without discrete diac assembly. Consider the 2500V rms isolation for applications requiring electrical separation between control and power circuits. Evaluate the thermal management requirements for the TO-220 package based on the expected RMS current load and ambient operating conditions.

Triacs Part Context

The Q2004LT belongs to the Teccor brand Quadrac series developed by Littelfuse. This series combines triacs with internal diac triggers to simplify circuit design. The family includes various current and voltage ratings, typically ranging from 4A to 15A and 200V to 600V, all housed in standard TO-220 packages for industrial and consumer applications.

Triacs Replacement Considerations

Direct substitutes include other Quadrac devices from the same series such as Q2006LH4 or Q4008LT, provided they meet the voltage and current requirements. Cross-brand replacements must match the integrated diac functionality and TO-220 isolation specifications.