L4004L8TP

Triacs Overview

The Littelfuse L4004L8TP is a bidirectional triac designed for AC switching and phase control applications. It features an RMS on-state current of 4 A and supports rated repetitive off-state voltages of 400 V, 600 V, or 800 V. The device operates with a gate trigger current ranging from 5 mA to 50 mA and maintains a maximum holding current of 50 mA. It utilizes a TO-220-2 package for through-hole mounting and functions within a temperature range of -40°C to +125°C.

Triacs Feature Summary

• Sensitive gate type operation ensures reliable triggering in quadrants I and IV for digital control circuitry compatibility.
• Glass-passivated junctions provide robust protection against voltage transients and environmental stress.
• Solid-state switching design eliminates arcing and contact bounce associated with mechanical relays.

Triacs Applications

• AC solid-state switches
• Lighting controls and dimmers
• Motor speed modulation

Triacs Procurement Notes

Verify the specific voltage rating suffix (e.g., 4, 6, or 8) required for the target application, as the base series covers multiple voltage classes. Confirm that the sensitive gate characteristic aligns with the driving circuit's output capability. Ensure the TO-220-2 thermal management strategy meets the system's power dissipation requirements under continuous load conditions.

Triacs Selection Notes

Select this component when a compact, high-reliability solid-state switch is needed for low-to-medium power AC loads. The sensitive gate option is critical if the control signal originates from low-power logic circuits. Compare surge current capabilities against potential inrush currents in the specific load type to ensure adequate safety margins during turn-on events.

Triacs Part Context

This part belongs to the Lxx08xx and Qxx08xx family of 8-ampere class triacs manufactured by Littelfuse. These components are engineered for general-purpose AC power control, offering a balance of electrical performance and physical durability. The series is widely utilized in consumer electronics and industrial appliances requiring efficient phase-angle control.

Triacs Replacement Considerations

Direct replacements include other parts from the Lxx08xx series with matching voltage ratings. Cross-reference gate trigger specifications carefully when substituting standard triacs with sensitive gate variants to ensure proper firing reliability.

Triacs FAQ

What is the difference between the L4004L8TP and Q4004L8TP?

Both belong to the same functional family but may differ in specific manufacturing lot characteristics or isolation ratings. Verify the datasheet for exact isolation voltage differences if electrical isolation is a critical design parameter.

Does this triac require a snubber circuit?

Standard sensitive gate triacs like this model typically benefit from snubber networks in highly inductive loads to prevent false triggering due to high dv/dt rates, though specific circuit requirements depend on the load impedance.