LJ4004D8TP

Triacs Overview

The Littelfuse LJ4004D8TP is a bidirectional triac in the Teccor LJxx04xx series, housed in a surface-mount TO-252 (D-PAK) package. It features a 4 A RMS on-state current and a 400 V rated repetitive off-state voltage. The device has a maximum on-state voltage of 1.4 V and a gate trigger current of 1.2 A. Operating within a temperature range of -40°C to +150°C, it includes glass-passivated junctions for reliability. This sensitive gate type ensures control in Quadrants I and IV, making it suitable for digital interface applications requiring precise phase control.

Triacs Feature Summary

• Sensitive gate design enabling reliable triggering from low-current digital logic circuits in Quadrants I and IV.
• Glass-passivated junctions provide long-term parameter stability and protection against environmental stress.
• Surface-mount TO-252 package facilitates automated assembly and efficient thermal management.

Triacs Applications

• Motor speed control systems
• Temperature modulation controls
• Lighting dimming circuits

Triacs Procurement Notes

Verify the specific ordering suffix to confirm the exact packaging configuration, as variations may exist between tube and tape-and-reel formats. Confirm RoHS compliance status with the manufacturer or authorized distributor prior to finalizing procurement orders to ensure adherence to regulatory requirements.

Triacs Selection Notes

Select this component when a 400 V blocking voltage and 4 A continuous current are required in a compact surface-mount form factor. Ensure the driving circuit can supply at least 1.2 A gate current for reliable turn-on. Consider the thermal resistance of the PCB layout to maintain junction temperatures within the specified operating range during high-load conditions.

Triacs Part Context

This part belongs to the Teccor LJxx04xx series of 4 Amp bi-directional solid-state switches. The series is engineered for AC switching and phase control, offering a balance of power handling and sensitivity for modern electronic control designs.

Triacs Replacement Considerations

Compatible substitutes include other 4A/400V sensitive gate triacs in TO-252 packages, such as the L4004D8RP or L8004D8TP, provided gate current and voltage parameters match the original design requirements.

Triacs FAQ

What is the maximum gate trigger current for the LJ4004D8TP?

The maximum gate trigger current (Igt) is 1.2 A, which is necessary to ensure reliable triggering in Quadrants I and IV.

Does the LJ4004D8TP support operation in Quadrant III?

While primarily designed for sensitive gate control in Quadrants I and IV, standard triac operation typically includes Quadrant III; however, the datasheet emphasizes its suitability for digital control via Quadrants I and IV.

What is the maximum operating temperature for this triac?

The maximum operating temperature is +150°C, allowing for robust performance in high-temperature environments.