Q4008NH4TP

Triacs Overview

The Littelfuse Q4008NH4TP is a bidirectional triac from the Qxx08xHx series, designed for AC switching and phase control applications. It features an RMS on-state current of 8 A and a rated repetitive off-state voltage (VDRM) of 400 V. The device operates within a junction temperature range of -40°C to +125°C and utilizes an SMTO-263-2 surface-mount package. Key electrical parameters include a maximum holding current of 35 mA, a gate trigger voltage of 1.3 V, and a gate trigger current of 35 mA. Non-repetitive peak on-state currents are specified at 83 A and 100 A, with an on-state voltage of 1.6 V and a maximum off-state leakage current of 10 µA.

Triacs Feature Summary

• High commutation capability suitable for circuits requiring high dv/dt performance
• Sensitive gate design ensuring reliable control in Quadrants I and IV for digital circuitry compatibility
• Surface-mount construction optimized for automated PCB assembly processes

Triacs Applications

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

Triacs Procurement Notes

Verify the specific suffix NH4TP against official Littelfuse documentation to confirm the exact pinout and thermal characteristics for the SMTO-263-2 package. Ensure that the 400V voltage rating aligns with the peak inverse voltage requirements of the target AC line application. Confirm RoHS compliance status through the manufacturer's latest environmental declaration before finalizing component selection.

Triacs Selection Notes

Select this component when a surface-mount solution is required for 8A AC load control. The Alternistor architecture provides superior commutation compared to standard triacs, making it suitable for inductive loads. Verify that the gate drive circuit can supply the minimum 35 mA trigger current. Consider thermal management requirements for the SMTO-263-2 package under continuous 8A operation conditions.

Triacs Part Context

This part belongs to the Qxx08xHx series of 8 Amp Triacs manufactured by Littelfuse. The series includes sensitive, standard, and Alternistor variants. The Q4008NH4TP specifically represents the Alternistor type with surface-mount packaging, distinguishing it from through-hole equivalents like the Q4008L4TP or other voltage ratings within the same current family.

Triacs Replacement Considerations

Direct replacements must match the 8A RMS current, 400V blocking voltage, and SMTO-263-2 package. Verify gate sensitivity and dv/dt ratings if substituting with non-Alternistor types. Cross-reference with Littelfuse Q4008NH4R for potential reel vs. cut-tape variations.