L6004L356 Equivalent & Substitute Parts

Part Overview

The L6004L356 is a Logic - Sensitive Gate TRIAC rated for 600 V off-state voltage and 4 A on-state current in a TO-220-3 Isolated Tab through-hole package. Manufactured by Littelfuse Inc., this component is discontinued at DiGi Electronics. Equivalent and substitute parts are available from STMicroelectronics with active product status, offering comparable or enhanced electrical characteristics while maintaining through-hole TO-220 form factors suitable for direct board-level replacement or circuit redesign.

Key Parameters

Parameter	L6004L356
Manufacturer	Littelfuse Inc.
Category	Thyristors - TRIAC
Triac Type	Logic - Sensitive Gate
Voltage - Off State	600 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
Current - Non Rep. Surge (50/60 Hz)	33 A / 40 A
Operating Temperature Range	-40°C to 110°C (TJ)
Mounting Type	Through Hole
Package / Case	TO-220-3 Isolated Tab, Formed Leads
RoHS Status	ROHS3 Compliant
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution of the L6004L356 is determined by the following critical parameters:

Voltage Rating (Off State): Minimum 600 V to maintain voltage margin
Current Rating (On State): Minimum 4 A to support load requirements
Gate Trigger Characteristics: Vgt and Igt values must be compatible with existing gate drive circuitry
Package Type: TO-220-3 through-hole configuration for mechanical and thermal compatibility
Triac Type: Logic - Sensitive Gate variants prioritized for gate sensitivity matching

Substitute parts are grouped into two categories:

Category A - Direct Sensitive Gate Replacements (4 A Rating): BTA04-600SRG provides equivalent 4 A current handling with enhanced voltage rating (700 V) and active product status.

Category B - Higher Current Capacity Alternatives (6-8 A Rating): BTA06 and BTA08 series parts offer increased current capacity while maintaining 600 V voltage rating. These are suitable when circuit design permits higher current handling or when gate drive characteristics are compatible.

Parameter Comparison

Parameter	L6004L356	BTA04-600SRG	BTA06-600SWRG	BTA08-600TWRG	BTA08-600BWRG
Manufacturer	Littelfuse Inc.	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics
Triac Type	Logic - Sensitive Gate	Logic - Sensitive Gate	Logic - Sensitive Gate	Logic - Sensitive Gate	Alternistor - Snubberless
Voltage - Off State	600 V	700 V	600 V	600 V	600 V
Current - On State (It RMS Max)	4 A	4 A	6 A	8 A	8 A
Voltage - Gate Trigger (Vgt Max)	1.3 V	1.5 V	1.3 V	1.3 V	1.3 V
Current - Gate Trigger (Igt Max)	3 mA	10 mA	10 mA	5 mA	50 mA
Current - Hold (Ih Max)	5 mA	25 mA	15 mA	10 mA	50 mA
Current - Non Rep. Surge (50/60 Hz)	33 A / 40 A	40 A / 42 A	60 A / 63 A	80 A / 84 A	80 A / 84 A
Operating Temperature Range	-40°C to 110°C	-40°C to 110°C	-40°C to 125°C	-40°C to 125°C	-40°C to 125°C
Package / Case	TO-220-3 Isolated Tab	TO-220-3	TO-220-3	TO-220-3	TO-220-3
Product Status	Discontinued	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute - BTA04-600SRG: This STMicroelectronics part provides the closest functional match to the L6004L356. Both are Logic - Sensitive Gate TRIACs with 4 A on-state current rating and TO-220-3 through-hole packaging. The BTA04-600SRG offers enhanced voltage rating (700 V vs. 600 V) and active product status, ensuring long-term availability. Gate trigger voltage (Vgt) increases from 1.3 V to 1.5 V and gate trigger current (Igt) increases from 3 mA to 10 mA; gate drive circuitry must be verified for compatibility with these parameter shifts.

Secondary Substitutes - BTA06 and BTA08 Series: These parts are suitable only when circuit design accommodates higher on-state current ratings (6 A or 8 A). The BTA06-600SWRG maintains the 1.3 V gate trigger voltage specification and offers active product status with extended temperature range (-40°C to 125°C). The BTA08-600TWRG provides the lowest gate trigger current (5 mA) among higher-current alternatives, approaching the original 3 mA specification. All substitute parts maintain ROHS3 compliance and through-hole TO-220 form factors.

All recommended substitutes are active products from STMicroelectronics with established supply chain availability and full regulatory compliance documentation.

Frequently Asked Questions (FAQ)

Q: Can BTA04-600SRG directly replace L6004L356 without circuit modification? A: BTA04-600SRG is mechanically and electrically compatible for direct board-level replacement in TO-220-3 through-hole applications. However, gate drive circuitry must accommodate the increased Vgt (1.5 V vs. 1.3 V) and Igt (10 mA vs. 3 mA) specifications. Verify gate drive voltage and current sourcing capability before deployment.

Q: What is the difference between Logic - Sensitive Gate and Alternistor - Snubberless TRIAC types? A: Logic - Sensitive Gate TRIACs (such as L6004L356 and BTA04-600SRG) are optimized for low gate trigger current and voltage, suitable for microcontroller and logic-level gate drive circuits. Alternistor - Snubberless TRIACs (such as BTA08-600BWRG) incorporate internal snubber networks for improved EMI performance and are designed for direct AC line switching without external snubber components. These types have different gate drive requirements and are not interchangeable without circuit redesign.

Q: Why do BTA06 and BTA08 parts have higher gate trigger current (Igt) specifications? A: Higher current ratings (6 A and 8 A) typically correlate with larger die geometries and different gate structure designs, resulting in increased gate trigger current requirements. These parts are suitable only when the application load current exceeds 4 A or when gate drive circuitry is designed for higher gate current sourcing.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All recommended substitute parts (BTA04-600SRG, BTA06 series, and BTA08 series) are ROHS3 compliant and suitable for applications requiring regulatory compliance with hazardous substance restrictions.

Q: What is the impact of the extended operating temperature range in BTA06 and BTA08 parts? A: BTA06 and BTA08 series parts support -40°C to 125°C operating temperature range, compared to -40°C to 110°C for the L6004L356. This extended range provides additional thermal margin in high-temperature applications but does not affect substitution compatibility if the original design operates within the L6004L356 temperature specification.

Q: Is the TO-220-3 Isolated Tab package of L6004L356 compatible with standard TO-220-3 packages? A: TO-220-3 Isolated Tab (L6004L356) and standard TO-220-3 packages (BTA series) have identical pin pitch and lead geometry for through-hole mounting. The isolation tab design in the L6004L356 provides electrical isolation between the tab and the device substrate. Verify heatsinking requirements and electrical isolation needs in the target application before substitution.

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