L4004L556

Triacs Overview

The Littelfuse L4004L556 is a bidirectional triac from the Teccor Lxx04xx series, designed for AC switching and phase control applications. It features a 400 V rated repetitive off-state voltage (VDRM) and supports an RMS on-state current of 4 A. The device operates within a temperature range of -40°C to +110°C and utilizes a TO-220-2 through-hole package with bent leads. Key electrical characteristics include a maximum holding current of 10 mA, a gate trigger voltage of 2 V, and a gate trigger current of 5 mA. It exhibits a low on-state voltage of 1.6 V and a leakage current of 5 µA at VDRM.

Triacs Feature Summary

• Logic level sensitivity with defined gate trigger parameters for reliable triggering
• Electrically isolated mounting surface in TO-220-2 package configuration
• Glass-passivated junctions for long-term parameter stability

Triacs Applications

• AC speed controls
• Temperature modulation controls
• Lighting controls requiring noise immunity

Triacs Procurement Notes

Verify component authenticity by checking manufacturer markings against official datasheet specifications. Confirm package type and lead configuration match the TO-220-2 bent lead variant. Review RoHS compliance documentation as required for specific regulatory environments. Note that this part number may be discontinued; verify current availability status with authorized distributors before finalizing procurement plans.

Triacs Selection Notes

Select this component when a 400 V rating and 4 A continuous current capacity are required for AC load switching. Ensure the application circuit provides sufficient gate drive current exceeding 5 mA to guarantee reliable turn-on. Verify thermal management capabilities align with the specified operating temperature range of -40°C to +110°C under expected load conditions.

Triacs Part Context

This device belongs to the Littelfuse Teccor Lxx04xx series of logic-level triacs. These components integrate internal diac structures to simplify circuit design by eliminating external trigger components. The series is engineered for robust performance in consumer and industrial AC control environments where compact packaging and high reliability are essential.

Triacs Replacement Considerations

The L4004L5TP is a verified substitute within the same series offering identical electrical ratings but differing in factory packaging quantity.