Q6012LTH1LED

Triacs Overview

The Littelfuse Q6012LTH1LED is a 12 Amp Alternistor Quadrac designed for AC switching and phase control applications. It integrates a Triac and a DIAC into a single TO-220AB package with an isolated mounting tab. The device features a maximum holding current of 8 mA, optimized for low load currents typical in LED lighting. Key electrical parameters include a 600 V rated repetitive off-state voltage (VDRM/VRRM), a peak non-repetitive surge current of 120 A at 60 Hz, and a critical rate-of-rise of on-state current (di/dt) of 70 A/µs. The integrated DIAC has a breakover voltage range of 33 V to 43 V.

Triacs Feature Summary

• Integrates a Triac and DIAC in one package to simplify circuit design
• Low holding current of 8 mA maximum ensures performance with LED loads
• Isolated mounting tab provides 2500 V AC minimum isolation between tab and terminals
• UL Recognized TO-220AB package facilitates heat sinking

Triacs Applications

• Light dimmers with LED loads
• AC solid-state switches
• Small low current motor controls in power tools
• Low current motors in home/brown goods appliances

Triacs Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm packaging details. The datasheet lists the Q6012LTH1LEDTP variant as being supplied in tubes with a base quantity of 500 units per tube. Confirm that the selected part number matches the required physical configuration and packing mode for the intended assembly process.

Triacs Selection Notes

Select this component when designing circuits requiring both switching and triggering functions in a compact form factor. The 8 mA maximum holding current makes it suitable for low-power LED loads where standard triacs may fail to latch. Ensure the application operates within the 110 °C junction temperature limit and utilizes adequate heat sinking given the thermal resistance specifications provided in the datasheet.

Triacs Part Context

This device belongs to the Teccor brand Alternistor Quadrac series by Littelfuse. It combines the functionality of a thyristor switch and a trigger device to reduce component count. The Q6012LTH1LED is specifically engineered for LED lighting applications, addressing the unique current characteristics of modern solid-state lighting compared to traditional incandescent loads.

Triacs Replacement Considerations

Direct substitutes within the same family include the Q6008LTH1LED, which offers similar functionality with an 8 Amp rating. Designers should verify that the replacement part meets the specific current and voltage requirements of the existing circuit layout before implementation.

Triacs FAQ

What is the purpose of the integrated DIAC in the Q6012LTH1LED?

The integrated DIAC provides the necessary trigger voltage (33 V to 43 V) to turn on the internal Triac, eliminating the need for a separate discrete DIAC component in the circuit.

How does the holding current specification benefit LED applications?

The maximum holding current of 8 mA allows the device to remain latched even when the load current drops to very low levels, which is common in LED lighting, thereby preventing flickering or premature turn-off.

What is the isolation capability of the TO-220AB package?

The package features an isolated mounting tab that provides a minimum isolation voltage of 2500 V AC between the mounting tab and the active terminals (MT1, MT2, and Gate).