Q8008LH4TP

Triacs Overview

The Littelfuse Q8008LH4TP is an Alternistor TRIAC rated for 800V repetitive peak off-state voltage and 8A RMS on-state current. It utilizes a TO-220AB isolated package with three pins, featuring an isolated case connection for thermal management and safety. Key electrical parameters include a maximum DC gate trigger current of 35mA, a maximum DC gate trigger voltage of 1.3V, and a holding current of 35mA. The device exhibits a typical on-state voltage of 1.6V and a closed-state leakage current of 10µA. It supports a minimum critical rate of rise of off-state voltage of 200 V/µs and a minimum critical rate of rise of on-state current of 25 V/µs.

Triacs Feature Summary

• Isolated TO-220AB package design enables direct mounting to heatsinks without additional insulators.

Triacs Applications

• Industrial motor control systems
• Solid-state relay implementations
• High-power heating element regulation

Triacs Procurement Notes

Verify the specific ordering suffix against the manufacturer's official datasheet to confirm pinout configuration and isolation specifications. Ensure compliance with RoHS directives if required by the target assembly standards. Cross-reference the part number with Littelfuse documentation to validate the exact thermal resistance values and mechanical dimensions prior to finalizing procurement orders.

Triacs Selection Notes

Select this component when high-voltage isolation and robust thermal dissipation are required in power switching applications. The 800V rating suits medium-voltage AC loads, while the 8A current capacity supports moderate power levels. Verify that the gate drive circuitry can supply the specified 35mA trigger current reliably under all operating temperature conditions.

Triacs Part Context

This part belongs to the Qxx08xHx series of Alternistor TRIACs from Littelfuse. These devices are engineered for high-reliability industrial applications requiring superior surge capability and thermal performance compared to standard TRIACs. The series emphasizes ruggedness in harsh electrical environments.

Triacs Replacement Considerations

Consult Littelfuse official substitution guides for verified equivalents. Generic TRIAC replacements may lack the specific isolation characteristics or surge ratings of the original Alternistor design.

Triacs FAQ

What is the maximum repetitive peak off-state voltage?

The maximum repetitive peak off-state voltage (VDRM) is 800V.

Does the package provide electrical isolation?

Yes, the TO-220AB package features an isolated case connection, allowing the terminal to be mounted directly to a heatsink without electrical shorting.

What is the typical on-state voltage drop?

The typical on-state voltage (VT) is 1.6V at rated current.