Q4016LH4TP

Triacs Overview

The Littelfuse Q4016LH4TP is a Quadrac device, which integrates a triac and a diac trigger within a single package. It operates as a bidirectional AC switch with a gate control mechanism for either polarity of main terminal voltage. The component features a rated repetitive peak off-state voltage (VDRM) of 400 V and an on-state RMS current (IT(RMS)) of 16 A. It utilizes a TO-220 package with electrical isolation of 2500 V rms from the leads to the mounting surface. Key electrical parameters include a holding current maximum of 35 mA and a gate trigger current range of 35-35-35 mA.

Triacs Feature Summary

• Integrates a diac trigger inside the same package as the triac to eliminate the need for discrete components.
• Provides electrical isolation of 2500 V rms between the leads and the mounting surface.
• Functions as a bidirectional AC switch controlled by the gate for either polarity of main terminal voltage.

Triacs Applications

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

Triacs Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct package type and isolation ratings. Confirm RoHS compliance status through the latest product change notifications or datasheet revisions before finalizing procurement specifications.

Triacs Selection Notes

Select this component when design requirements necessitate an integrated triac-diac solution to reduce assembly complexity. Ensure the application voltage does not exceed the 400 V rating and that the thermal management system can handle the power dissipation associated with 16 A continuous operation in the specified package.

Triacs Part Context

This part belongs to the Qxx16xHx series of Teccor brand Quadrac devices manufactured by Littelfuse. These devices are designed to simplify circuit design by combining switching and triggering functions into one robust semiconductor component suitable for industrial and consumer AC control environments.

Triacs Replacement Considerations

Direct substitutes must be verified against the official Littelfuse cross-reference list. Generic Triacs require external Diacs and snubber networks, whereas this Quadrac eliminates those needs. Verify pinout compatibility and isolation voltage ratings before substitution.

Triacs FAQ

What is the primary advantage of using the Q4016LH4TP over a standard Triac?

It includes an internal diac trigger, saving the user the expense and assembly time of buying and assembling a discrete diac alongside a gated triac.

Is the Q4016LH4TP electrically isolated?

Yes, the TO-220 package provides electrical isolation of 2500 V rms from the leads to the mounting surface, eliminating the need for separate insulators.

Does this device require a snubber network?

As a Quadrac device (QxxxxLTH variant), it is designed to eliminate the need for a snubber network in many applications.