QK008RH4

Triacs Overview

The Littelfuse QK008RH4 is an Alternistor TRIAC rated for a maximum repetitive off-state voltage of 1000V and an RMS on-state current of 8A. It utilizes a TO-220AB package with three pins and features a main terminal 2 case connection. The device supports a minimum critical rate of rise of off-state voltage of 25 V/us, with a maximum DC gate trigger current of 35 mA and a maximum DC gate trigger voltage of 1.3 V. The holding current is specified at a maximum of 35 mA. It operates within a temperature range extending up to 125°C and is compliant with RoHS standards.

Triacs Feature Summary

• High reliability construction designed for robust performance in demanding environments
• Alternistor technology providing enhanced commutation capabilities and high dv/dt immunity
• Main terminal 2 configuration allowing direct mounting to heatsinks for efficient thermal management

Triacs Applications

• Industrial motor control systems requiring high voltage isolation
• Solid state relays for AC power switching applications
• Lighting control circuits for commercial and industrial fixtures

Triacs Procurement Notes

Verify the specific ordering suffix against official Littelfuse documentation to ensure correct packaging and variant selection. Confirm that the TO-220AB package matches your PCB footprint requirements. Check for RoHS compliance status if restricted substances are a constraint. Ensure the 1000V rating aligns with your circuit's peak voltage demands. Validate the 8A RMS current capacity against your load specifications before finalizing procurement.

Triacs Selection Notes

Select this component when a 1000V blocking capability is required alongside an 8A continuous current rating. The TO-220AB package is suitable for through-hole mounting and direct heatsinking. Consider the 25 V/us dv/dt rating for circuits with fast-switching transients. Verify that the 35 mA gate drive requirements match your control circuitry output capabilities. Ensure the 125°C junction temperature limit fits your thermal design constraints.

Triacs Part Context

The QK008RH4 belongs to the Littelfuse Alternistor family, which combines TRIAC functionality with improved commutation characteristics. This series is engineered for high-reliability applications where standard TRIACs may fail due to high dv/dt stress. The part shares core electrical parameters with other variants in the QK series but differs in package and specific thermal or mechanical attributes defined by its suffix.

Triacs Replacement Considerations

Direct replacements must maintain the 1000V VDRM, 8A IT(RMS), and TO-220AB package. Verify pinout compatibility, specifically the Main Terminal 2 configuration. Check for equivalent dv/dt ratings and gate trigger specifications to ensure circuit stability without redesign.