QK004D4TP

Triacs Overview

The Littelfuse QK004D4TP is a bidirectional triac designed for AC power control applications. It features a 1000 V rated repetitive off-state voltage and supports an RMS on-state current of 4 A. The device operates within a junction temperature range of -40°C to +150°C. Key electrical parameters include a maximum gate trigger voltage of 1.3 V and a gate trigger current of 25 mA. It exhibits a low on-state voltage of 1.4 V and a leakage current of 5 µA at the rated voltage. The component is housed in a TO-252 (D-PAK) surface-mount package, suitable for automated assembly processes.

Triacs Feature Summary

• High-voltage capability with 1000 V blocking rating for robust AC switching
• Surface-mount TO-252 package design for compact PCB integration
• Extended thermal operating range up to 150°C for demanding environments

Triacs Applications

• Solid-state relays
• Motor speed controls
• Lighting dimmers

Triacs Procurement Notes

Verify the specific manufacturer datasheet for the QK004D4TP to confirm RoHS compliance status and REACH SVHC declarations prior to procurement. Ensure that the ordering suffix matches the required tape-and-reel or tube packaging configuration. Cross-reference the part number with official Littelfuse documentation to validate the exact pinout and thermal characteristics for your specific board layout requirements.

Triacs Selection Notes

Select this component when a high-blocking voltage triac is required in a surface-mount form factor. The 4 A current rating suits moderate power loads. Verify that the gate drive circuit can supply the specified 25 mA trigger current. Consider the TO-252 thermal resistance if operating near the upper temperature limits. Ensure the application voltage does not exceed the 1000 V peak repetitive rating.

Triacs Part Context

This device belongs to the Littelfuse QK series of standard triacs. The 'TP' suffix typically denotes the specific packaging type, such as tape and reel, distinct from bulk tube variants like the QK004D4. This series provides glass-passivated junctions for reliability. It serves as a surface-mount alternative to through-hole TO-220 packages for similar voltage and current specifications.

Triacs Replacement Considerations

The QJ4004D4TP is a related variant but offers only 400 V blocking voltage, which is insufficient for 1000 V applications. Direct substitutes must match the 1000 V rating and TO-252 package. Consult Littelfuse for verified cross-reference data before replacing.