L4004L8

Triacs Overview

The Littelfuse L4004L8 is a four-quadrant logic level triac designed for sensitive gate triggering applications. It features a rated repetitive off-state voltage (VDRM) of 400 V and an on-state RMS current (IT(RMS)) of 4 A. The device operates within a junction temperature range of -40 °C to +125 °C. Key electrical characteristics include a maximum holding current of 5 mA and a typical gate trigger current of 5 mA, enabling direct interface with low-power logic circuits. The component is housed in a TO-220AB package, providing robust thermal performance for industrial control environments.

Triacs Feature Summary

• Four-quadrant sensitivity allows reliable triggering across all gate polarities and MT2 voltage polarities.
• Logic-level gate sensitivity enables direct drive from standard TTL or CMOS logic outputs without additional amplification.
• High surge current capability supports inductive load switching and motor control applications.

Triacs Applications

• Solid state relays requiring compact form factors
• AC motor speed control circuits
• Lighting dimmer modules

Triacs Procurement Notes

Verify the specific suffix against official Littelfuse documentation to confirm pinout configuration and thermal pad specifications. Ensure the selected variant matches the required gate sensitivity class for your logic interface. Cross-reference the datasheet revision date to confirm compliance with current environmental directives such as RoHS and REACH before finalizing procurement.

Triacs Selection Notes

Select this component when interfacing directly with microcontrollers or logic gates that cannot supply high gate currents. Compare the 4 A RMS rating against the peak load requirements of the application. Consider the TO-220AB package for through-hole mounting if PCB space allows, ensuring adequate heatsinking is planned for continuous operation near the maximum current limit.

Triacs Part Context

This part belongs to the Teccor L4004 series of sensitive gate triacs manufactured by Littelfuse. The series is engineered for general-purpose AC power control where low drive power is essential. It complements higher current variants in the same family, offering a balance between switching capability and ease of integration into digital control systems.

Triacs Replacement Considerations

Direct substitutes include other 400V 4A logic-level triacs from manufacturers like STMicroelectronics or Vishay, provided they match the TO-220AB package and 5mA gate trigger specifications. Verify pin compatibility and thermal resistance values before substitution.