L4004L3 Equivalent & Substitute Parts

Part Overview

The L4004L3 is a Logic-Sensitive Gate TRIAC manufactured by Littelfuse Inc., rated for 400 V off-state voltage and 4 A on-state current in a TO-220-3 Isolated Tab package. This component is discontinued at DiGi Electronics, making identification of suitable substitute parts essential for ongoing design support and procurement.

The discontinuation status necessitates evaluation of alternative TRIAC devices that maintain functional compatibility while meeting application requirements. Substitute parts must preserve the Logic-Sensitive Gate configuration and through-hole mounting characteristics to ensure drop-in compatibility.

Key Parameters

Parameter	L4004L3 (Main Part)
Manufacturer	Littelfuse Inc.
Category	Thyristors - TRIAC
Triac Type	Logic - Sensitive Gate
Voltage - Off State	400 V
Current - On State (It RMS, Max)	4 A
Voltage - Gate Trigger (Vgt, Max)	1.3 V
Current - Gate Trigger (Igt, Max)	3 mA
Current - Hold (Ih, Max)	5 mA
Operating Temperature Range	-40°C to 110°C (TJ)
Mounting Type	Through Hole
Package / Case	TO-220-3 Isolated Tab
RoHS Status	ROHS3 Compliant
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution of the L4004L3 is determined by the following critical parameters:

TRIAC Type: Logic-Sensitive Gate configuration must be maintained for gate-drive compatibility
Mounting Type: Through-hole TO-220 package required for PCB compatibility
Voltage Rating: Off-state voltage must equal or exceed 400 V
Current Rating: On-state current (It RMS) must equal or exceed 4 A
Gate Trigger Parameters: Vgt and Igt characteristics must support existing gate-drive circuits
Temperature Range: Operating temperature capability must cover application requirements
Compliance: RoHS3 compliance required for regulatory alignment

The BTA06-600TWRG qualifies as a substitute based on these criteria. It maintains the Logic-Sensitive Gate TRIAC type, through-hole TO-220 mounting, and exceeds the voltage and current ratings of the original part while preserving gate-trigger characteristics within acceptable tolerance.

Parameter Comparison

Parameter	L4004L3	BTA06-600TWRG	Compatibility Notes
Manufacturer	Littelfuse Inc.	STMicroelectronics	Different manufacturer; same device category
Triac Type	Logic - Sensitive Gate	Logic - Sensitive Gate	Identical configuration
Voltage - Off State	400 V	600 V	Substitute rated higher; suitable for 400 V applications
Current - On State (It RMS, Max)	4 A	6 A	Substitute rated higher; suitable for 4 A applications
Voltage - Gate Trigger (Vgt, Max)	1.3 V	1.3 V	Identical specification
Current - Gate Trigger (Igt, Max)	3 mA	5 mA	Substitute rated higher; gate-drive circuit must support
Current - Hold (Ih, Max)	5 mA	10 mA	Substitute rated higher; acceptable for hold-current applications
Operating Temperature Range	-40°C to 110°C (TJ)	-40°C to 125°C (TJ)	Substitute supports extended upper temperature limit
Mounting Type	Through Hole	Through Hole	Identical mounting; direct PCB compatibility
Package / Case	TO-220-3 Isolated Tab	TO-220-3	Compatible package footprint
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Both meet regulatory requirements
Product Status	Discontinued	Active	Substitute actively manufactured and stocked

Engineering Selection Recommendations

The BTA06-600TWRG is suitable as a substitute for the L4004L3 based on the following engineering criteria:

Product Availability: The BTA06-600TWRG is active and maintains 2058 units in stock, ensuring procurement reliability compared to the discontinued L4004L3
Regulatory Compliance: Both parts maintain ROHS3 compliance, satisfying environmental and regulatory requirements
Electrical Ratings: The substitute exceeds the original part specifications in voltage (600 V vs. 400 V) and current (6 A vs. 4 A), providing design margin for the intended application
Gate-Drive Compatibility: Identical Vgt specification (1.3 V) ensures gate-trigger voltage compatibility; the higher Igt (5 mA vs. 3 mA) requires verification that existing gate-drive circuits can supply the additional current
Thermal Performance: Extended operating temperature range (-40°C to 125°C vs. -40°C to 110°C) supports broader environmental conditions
Package Compatibility: TO-220-3 package maintains identical PCB footprint and thermal interface characteristics

Frequently Asked Questions (FAQ)

Q: Can the BTA06-600TWRG be used as a direct replacement for the L4004L3?

A: Yes, the BTA06-600TWRG is electrically and mechanically compatible for applications requiring the L4004L3. The substitute maintains the Logic-Sensitive Gate TRIAC type, TO-220-3 through-hole package, and gate-trigger voltage specification. Gate-drive circuits must be verified to supply the higher Igt requirement (5 mA vs. 3 mA).

Q: What are the key differences between these parts?

A: The BTA06-600TWRG has higher voltage (600 V vs. 400 V) and current (6 A vs. 4 A) ratings, higher gate-trigger current (5 mA vs. 3 mA), higher hold current (10 mA vs. 5 mA), and an extended operating temperature range (125°C vs. 110°C maximum). These differences represent design margin rather than incompatibility.

Q: Does the higher gate-trigger current affect circuit design?

A: The gate-drive circuit must be capable of supplying 5 mA to the BTA06-600TWRG gate terminal. If the original circuit was designed for 3 mA, verification of gate-drive source impedance and current capacity is required to ensure reliable triggering.

Q: Are both parts RoHS compliant?

A: Yes, both the L4004L3 and BTA06-600TWRG are ROHS3 compliant, meeting environmental and regulatory requirements for electronic component manufacturing and use.

Q: What is the package compatibility between these parts?

A: Both parts use TO-220-3 through-hole packages with identical pin configurations and PCB footprints. The L4004L3 uses an Isolated Tab variant, while the BTA06-600TWRG uses standard TO-220. Both are compatible with standard TO-220 mounting hardware and thermal management solutions.

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