Q2008LH4

Triacs Overview

The Q2008LH4 is an Alternistor TRIAC manufactured by Littelfuse, designed for high-reliability power control applications. It features a maximum repetitive peak off-state voltage of 800V and an RMS on-state current rating of 8A. The device utilizes an isolated TO-220AB flange mount package with three pins, facilitating efficient heat dissipation and secure mounting. Key electrical characteristics include a critical rate of rise of off-state voltage of 200 V/us and a gate trigger voltage of up to 1.3V. This component is engineered for robust performance in industrial environments requiring reliable switching capabilities.

Triacs Feature Summary

• High-voltage capability with 800V blocking voltage for demanding power circuits
• Isolated flange mount construction for enhanced thermal management and safety
• Robust commutation performance suitable for inductive load switching

Triacs Applications

• Industrial motor control systems
• High-power AC switching circuits
• Solid-state relays and contactors

Triacs Procurement Notes

Verify the specific datasheet revision and manufacturer documentation to confirm exact electrical tolerances and mechanical dimensions before integration. Ensure that the isolated package type matches the thermal interface requirements of the target heatsink assembly. Cross-reference official Littelfuse resources for any updates regarding lead-free compliance or packaging variations.

Triacs Selection Notes

Select this component when an 8A RMS current rating and 800V voltage blocking capability are required in a thermally efficient package. The isolated TO-220AB form factor is ideal for applications needing direct mounting to chassis grounds or heatsinks. Evaluate the gate trigger specifications against the driving circuit's output capabilities to ensure reliable turn-on under all operating conditions.

Triacs Part Context

This part belongs to the Alternistor family of TRIACs from Littelfuse, which are optimized for high-reliability industrial applications. Unlike standard TRIACs, Alternistors offer improved commutation characteristics and ruggedness, making them suitable for harsh environments where standard devices might fail due to high dv/dt or di/dt stresses.

Triacs Replacement Considerations

Direct replacements should be sought within the Littelfuse Alternistor series with matching 800V and 8A ratings. Verify pinout compatibility and thermal resistance values when substituting with components from other manufacturers to ensure equivalent performance in the existing circuit design.