Q8040J7TP

Triacs Overview

The Littelfuse Q8040J7TP is a bidirectional triac designed for high-power AC switching applications. It features an RMS on-state current (It RMS) of 40 A and supports non-repetitive peak on-state currents of 335 A or 400 A depending on the specific test condition. The device has a rated repetitive peak off-state voltage (VDRM) of 800 V, with a maximum off-state leakage current of 20 uA at VDRM. Key electrical parameters include an on-state voltage of 1.8 V, a maximum holding current (Ih) of 120 mA, and gate trigger specifications of 2.5 V (Vgt) and 100 mA (Igt). It operates within a temperature range of -40 C to +125 C and utilizes an SMTO-218 through-hole package.

Triacs Feature Summary

• High-voltage blocking capability suitable for industrial AC power control
• Robust thermal performance in a standard TO-218 compatible leaded package
• Defined gate sensitivity for reliable triggering in thyristor circuits

Triacs Applications

• Industrial motor speed control systems
• Solid-state relays for AC load switching
• Lighting dimmer circuits for commercial loads

Triacs Procurement Notes

Verify the exact datasheet revision when sourcing, as Littelfuse may update pinout or mechanical dimensions over time. Confirm RoHS compliance status directly from the manufacturer's official documentation prior to integration. Ensure the supplier provides traceable component history to maintain quality standards for critical power electronics assemblies.

Triacs Selection Notes

Select this component when an 800 V rating is required for mains-connected applications. Compare against the QJ8040JH7TP if higher surge current capacity (500 A vs 335/400 A) or lower on-state voltage (1.6 V vs 1.8 V) is necessary. Verify that the 40 A RMS current rating aligns with the thermal management capabilities of the final PCB design.

Triacs Part Context

This part belongs to the Qxx40xx series of triacs from Littelfuse, which are engineered for general-purpose AC power control. It shares the same physical footprint and basic current handling characteristics with other variants like the Q6040J7TP, differing primarily in its voltage blocking capability. The series is widely used in legacy and modern industrial designs requiring robust thyristor solutions.

Triacs Replacement Considerations

The QJ8040JH7TP serves as a direct functional substitute offering improved surge current handling and lower conduction losses. Designers should verify that the slightly different gate trigger voltages do not impact existing drive circuitry before swapping components.