QK008LH4

Triacs Overview

The Littelfuse QK008LH4 is a bidirectional TRIAC from the Qxx08xHx series, designed for surface-mount applications in the SMTO-263-2 package. It features an RMS on-state current of 8 A and a rated repetitive off-state voltage (VDRM) of 800 V. The device supports a non-repetitive peak on-state current of 83 A or 100 A, with a maximum holding current of 35 mA. Gate triggering parameters include a maximum DC gate trigger voltage of 1.3 V and a maximum DC gate trigger current of 35 mA. The on-state voltage is specified at 1.6 V, while the off-state leakage current is limited to 10 uA at VDRM. Operating temperatures range from -40 C to +125 C.

Triacs Feature Summary

• High-voltage blocking capability suitable for demanding AC power control environments
• Surface-mount construction optimized for automated PCB assembly processes
• Robust thermal performance supporting operation up to 125 C junction temperature

Triacs Applications

• Solid-state relay modules requiring compact form factors
• Industrial motor speed control circuits
• Lighting dimmer systems for commercial fixtures

Triacs Procurement Notes

Verify the specific suffix against official Littelfuse documentation to confirm pinout and isolation characteristics. Confirm RoHS compliance status through the manufacturer's latest datasheet revision. Ensure the ordering quantity aligns with standard reel packaging requirements defined by the supplier. Validate that the SMTO-263-2 footprint matches the target PCB design constraints before finalizing procurement orders.

Triacs Selection Notes

Select this component when an 800 V rating is required for high-line AC applications. The 8 A RMS current capacity suits moderate power loads compared to higher-current alternatives. Consider the SMD package type if space efficiency and automated assembly are primary design drivers. Compare gate sensitivity requirements against the 35 mA trigger specification to ensure compatibility with available drive circuitry.

Triacs Part Context

This part belongs to the Qxx08xHx family of TRIACs, which share common electrical characteristics such as 8 A current handling and similar gate thresholds. Variations within this series typically involve differences in voltage ratings, such as the 1000 V variant, or package styles like through-hole options. The QK008LH4 specifically denotes the surface-mount configuration within this standardized product line.

Triacs Replacement Considerations

Direct substitutes may include other 800 V, 8 A TRIACs in equivalent SMD packages. Verify pin-to-pin compatibility and thermal resistance values before substitution. Alternative voltage ratings require circuit re-evaluation. Consult Littelfuse application notes for recommended cross-reference procedures.