Q4035RH5

Triacs Overview

The Littelfuse Q4035RH5 is a high-power Alternistor Triac designed for robust AC power control applications. It features a 400V repetitive peak off-state voltage and an on-state RMS current rating of 35A. The device operates within a junction temperature range of -40°C to +125°C and utilizes a TO-220AB non-isolated tab package. Key electrical characteristics include a maximum holding current of 50mA, a gate trigger current of 50mA, and a typical on-state voltage of 1.5V. This component belongs to the Qxx35xHx series, engineered for high thermal stability and snubberless operation in demanding environments.

Triacs Feature Summary

• Snubberless design capability reduces external circuit complexity
• High thermal stability supports operation up to +125°C junction temperature
• Alternistor architecture provides enhanced ruggedness against dv/dt stress

Triacs Applications

• Industrial motor control systems
• High-power heating element regulation
• AC power switching in heavy-duty appliances

Triacs Procurement Notes

Verify the specific suffix and marking code against the official Littelfuse datasheet to ensure compatibility with your thermal management requirements. Confirm that the TO-220AB package configuration matches your PCB layout constraints. Check for any recent product change notices regarding pinout or material composition updates before finalizing the bill of materials.

Triacs Selection Notes

Select this component when a 35A RMS current capacity at 400V blocking voltage is required. Ensure the application can accommodate the TO-220AB package size and thermal dissipation needs. Consider the 50mA gate trigger sensitivity for driver interface compatibility. Evaluate the snubberless feature benefits against potential EMI requirements in the specific circuit topology.

Triacs Part Context

This part belongs to the Littelfuse Alternistor Triac family, specifically the Qxx35xHx series. These devices are distinguished by their high current handling and thermal resilience compared to standard triacs. The Q4035RH5 represents a mid-range current option within the 35A class, offering a balance between performance and package thermal resistance for industrial-grade implementations.

Triacs Replacement Considerations

Direct substitutes may include other 400V 35A Alternistor Triacs from Littelfuse such as the Q4035R5TP, provided the package and thermal characteristics align. Verify equivalent VDRM, IT(RMS), and IGT specifications before substitution. Cross-reference with competitor parts only if they match the exact package footprint and electrical ratings.