Q4010LTH

Triacs Overview

The Littelfuse Q4010LTH is a Teccor 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 a rated repetitive off-state voltage (VDRM) of 400 V and an on-state RMS current (ITRMS) of 10 A. It includes a built-in diac with breakover voltages ranging from 33 V to 43 V. The device offers high noise immunity and eliminates the need for external snubber networks or discrete diacs.

Triacs Feature Summary

• Integrated Diac Trigger: Combines a triac and diac in one package to simplify assembly and reduce component count.
• Snubberless Design: Eliminates the requirement for external snubber networks, simplifying circuit design.
• High Noise Immunity: Engineered for reliable operation in applications requiring strong noise rejection capabilities.
• Electrical Isolation: The TO-220 package provides electrical isolation up to 2500 V rms between leads and the mounting surface.

Triacs Applications

• AC speed controls
• Temperature modulation controls
• Lighting controls

Triacs Procurement Notes

Verify the specific suffix against official Littelfuse documentation to confirm exact electrical characteristics and packaging options. Ensure the selected variant meets the required voltage and current ratings for the target application. Confirm RoHS compliance status through the manufacturer's datasheet before finalizing procurement specifications.

Triacs Selection Notes

Select this component for AC switching applications where integrated triggering and snubberless operation are beneficial. Consider the 400 V voltage rating and 10 A current capacity when designing circuits. Evaluate the thermal requirements for the TO-220 package based on the expected load conditions and ambient temperature.

Triacs Part Context

The Q4010LTH belongs to the Teccor Quadrac series by Littelfuse. These devices are designed to replace separate triac and diac assemblies, offering cost savings and reduced assembly time. The series covers various current and voltage ratings, providing flexibility for different AC control needs while maintaining high reliability through glass-passivated junctions.

Triacs Replacement Considerations

Direct replacements must match the integrated triac-diac configuration and snubberless capability. Verify that substitute parts offer comparable VDRM, ITRMS, and diac breakover voltage ranges. Ensure the replacement package maintains similar isolation and thermal performance characteristics.

Triacs FAQ

What is the primary advantage of the Q4010LTH over a standard triac?

It integrates a diac trigger inside the package, eliminating the need for a discrete diac and simplifying the circuit design.

Does the Q4010LTH require an external snubber network?

No, the Quadrac device is designed to eliminate the need for a snubber network.

What is the isolation rating of the TO-220 package?

The package is electrically isolated to 2500 V rms from the leads to the mounting surface.