Q4008N4TP

Triacs Overview

The Littelfuse Q4008N4TP is a bidirectional triac designed for AC switching and phase control applications. It features an 8 A RMS on-state current and a 400 V rated repetitive off-state voltage. The device operates within a junction temperature range of -40 °C to +125 °C and utilizes a TO-220-2 through-hole package. Key electrical parameters include a maximum holding current of 50 mA, a gate trigger voltage of 2.5 V, and a gate trigger current of 25 mA or 50 mA. It exhibits a typical on-state voltage of 1.6 V and a non-repetitive peak on-state current capability of 83 A or 100 A.

Triacs Feature Summary

• Sensitive gate design ensuring reliable triggering in Quadrants I and IV for digital control circuitry compatibility.
• Standard operation in Quadrants I and III triggered directly from the AC line.
• Robust construction with UL recognition for 2500Vrms isolation.

Triacs Applications

• Motor speed modulation controls
• Temperature modulation systems
• Lighting controls
• Static switching relays

Triacs Procurement Notes

Verify the specific datasheet revision and agency approval numbers (e.g., UL File E71639) against the manufacturer's official documentation before finalizing procurement. Ensure the ordering suffix matches the required packaging configuration. Confirm RoHS compliance status and REACH SVHC declarations are current for the intended manufacturing region.

Triacs Selection Notes

Select this component when a sensitive gate triac is required for digital interface circuits operating in Quadrants I and IV. Verify that the 400 V blocking voltage and 8 A RMS current ratings exceed the application's peak load requirements. Consider the TO-220-2 package thermal characteristics and ensure adequate heatsinking if operating near the maximum temperature limit.

Triacs Part Context

This part belongs to the Lxx08xx, Qxx08xx, and Qxx08xHx series of 8 Amp bi-directional solid state switches manufactured by Littelfuse under the Teccor brand. These devices are engineered specifically for AC switching and phase control tasks, offering variations in gate sensitivity and commutation capabilities across the family.

Triacs Replacement Considerations

Direct replacements within the same series include Q4008L4TP and Q4008NH4RP. Verify that substitute parts match the required gate trigger characteristics and package type. Cross-reference electrical limits such as VDRM and IT(RMS) to ensure compatibility with the existing circuit design constraints.