Q4008L4

Triacs Overview

The Littelfuse Q4008L4TP is a bidirectional triac designed for AC power control applications. It features an RMS on-state current (It RMS) of 8 A and a rated repetitive peak off-state voltage (VDRM) of 400 V. The device operates within a 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 (Ih) of 50 mA, a gate trigger voltage (Vgt) of 2.5 V, and a gate trigger current (Igt) ranging from 25 mA to 50 mA. The on-state voltage is specified at 1.6 V, with a non-repetitive peak on-state current capability of 83 A or 100 A depending on the pulse width.

Triacs Feature Summary

• Bidirectional switching capability for AC load control
• Robust thermal performance suitable for high-temperature environments up to 125°C
• High surge current handling capacity for inductive loads

Triacs Applications

• Lighting dimmers
• Motor speed controls
• Solid state relays

Triacs Procurement Notes

Verify the specific suffix against official Littelfuse documentation to confirm exact electrical tolerances and packaging variations. Ensure the procurement channel provides valid traceability and authenticity guarantees for semiconductor components. Cross-reference the manufacturer part number with authorized distributor catalogs to confirm current availability status and lead times before finalizing orders.

Triacs Selection Notes

Select this component when a 400 V blocking voltage and 8 A continuous current rating are required for AC switching. Verify that the gate drive circuit can supply the necessary trigger current of up to 50 mA. Consider the TO-220-2 package dimensions for PCB layout and ensure adequate heatsinking is provided to maintain junction temperatures within the specified operating range during continuous conduction.

Triacs Part Context

This triac belongs to the Qxx08xx series from Littelfuse, which focuses on general-purpose thyristor solutions. The Q4008L4TP variant specifically targets applications requiring reliable AC phase control with moderate power handling capabilities. It serves as a standard component in industrial and consumer electronics for managing alternating current loads efficiently.

Triacs Replacement Considerations

Direct replacements may include other 8 A, 400 V triacs in TO-220 packages from Littelfuse or competitors, provided gate trigger characteristics and holding currents are compatible. Verify pinout compatibility and thermal resistance values to ensure equivalent performance without redesigning the driver circuitry.