Q6004LT TRIAC Equivalent & Substitute Parts

Part Overview

The Q6004LT is an internally triggered TRIAC manufactured by Littelfuse Inc., rated for 600 V off-state voltage and 4 A on-state current in a TO-220 isolated tab package. This component is discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing design support and procurement. The part operates across the industrial temperature range of -40°C to 125°C and complies with RoHS3 standards.

Key Parameters

Parameter	Q6004LT Value
Voltage - Off State	600 V
Current - On State (It RMS, Max)	4 A
Current - Non Rep. Surge (50/60 Hz)	46 A / 55 A
Current - Hold (Ih, Max)	40 mA
Triac Type	Internally Triggered
Configuration	Single
Operating Temperature	-40°C to 125°C (TJ)
Mounting Type	Through Hole
Package / Case	TO-220-3 Isolated Tab
RoHS Status	RoHS3 Compliant
MSL	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the Q6004LT is determined by the following critical parameters:

Voltage Rating: All substitutes must maintain 600 V off-state voltage to ensure circuit protection and reliability
Current Rating: Substitute parts must support at least 4 A on-state current; higher ratings (6 A, 8 A, 10 A, 12 A) are acceptable as they provide design margin
Package Compatibility: TO-220-3 package is required for mechanical and thermal compatibility
Operating Temperature Range: -40°C to 125°C must be maintained
Configuration: Single TRIAC configuration only
Compliance: RoHS3 compliance required

The substitute parts listed below meet or exceed these parameters. Triac type variations (Internally Triggered, Alternistor - Snubberless, Logic - Sensitive Gate, Standard) represent different internal trigger architectures and gate sensitivity characteristics, all of which are functionally compatible within the specified voltage and current envelope.

Parameter Comparison

Part Number	Manufacturer	Voltage - Off State	Current - On State (It RMS, Max)	Current - Non Rep. Surge (50/60 Hz)	Current - Hold (Ih, Max)	Triac Type	Operating Temperature	Package / Case	Product Status	RoHS Status
Q6004LT	Littelfuse Inc.	600 V	4 A	46 A / 55 A	40 mA	Internally Triggered	-40°C to 125°C	TO-220-3 Isolated Tab	Discontinued	RoHS3
BTA06-600BWRG	STMicroelectronics	600 V	6 A	60 A / 63 A	50 mA	Alternistor - Snubberless	-40°C to 125°C	TO-220-3	Active	RoHS3
BTA06-600CWRG	STMicroelectronics	600 V	6 A	60 A / 63 A	35 mA	Alternistor - Snubberless	-40°C to 125°C	TO-220-3	Active	RoHS3
BTA06-600TWRG	STMicroelectronics	600 V	6 A	60 A / 63 A	10 mA	Logic - Sensitive Gate	-40°C to 125°C	TO-220-3	Active	RoHS3
BTA08-600CWRG	STMicroelectronics	600 V	8 A	80 A / 84 A	35 mA	Alternistor - Snubberless	-40°C to 125°C	TO-220-3	Active	RoHS3
BTA08-600SWRG	STMicroelectronics	600 V	8 A	80 A / 84 A	15 mA	Logic - Sensitive Gate	-40°C to 125°C	TO-220-3	Active	RoHS3
BTA10-600BRG	STMicroelectronics	600 V	10 A	100 A / 105 A	50 mA	Standard	-40°C to 125°C	TO-220-3	Active	RoHS3
BTA10-600CRG	STMicroelectronics	600 V	10 A	100 A / 105 A	25 mA	Standard	-40°C to 125°C	TO-220-3	Active	RoHS3
BTA12-600BRG	STMicroelectronics	600 V	12 A	120 A / 126 A	50 mA	Standard	-40°C to 125°C	TO-220-3	Active	RoHS3
BTA12-600CRG	STMicroelectronics	600 V	12 A	120 A / 126 A	25 mA	Standard	-40°C to 125°C	TO-220-3 Full Pack	Active	RoHS3
BTA12-600CWRG	STMicroelectronics	600 V	12 A	120 A / 126 A	35 mA	Alternistor - Snubberless	-40°C to 125°C	TO-220-3	Active	RoHS3

Engineering Selection Recommendations

All listed substitute parts are active products from STMicroelectronics with RoHS3 compliance and identical operating temperature ranges to the Q6004LT. Selection among substitutes depends on application-specific requirements:

For direct current rating match (4 A minimum): BTA06-600BWRG, BTA06-600CWRG, and BTA06-600TWRG provide the closest current rating at 6 A with full design margin.

For applications requiring lower gate trigger current: BTA06-600TWRG and BTA08-600SWRG feature Logic - Sensitive Gate architecture with reduced gate trigger current (5 mA and 10 mA respectively), suitable for low-power gate drive circuits.

For applications requiring higher current capacity: BTA08-600CWRG, BTA10-600BRG, BTA10-600CRG, BTA12-600BRG, BTA12-600CRG, and BTA12-600CWRG provide 8 A to 12 A ratings with proportionally increased surge current ratings.

For snubberless operation: Alternistor - Snubberless variants (BTA06-600BWRG, BTA06-600CWRG, BTA08-600CWRG, BTA12-600CWRG) eliminate the need for external snubber networks in AC switching applications.

All substitutes maintain TO-220-3 package compatibility and single-configuration architecture. Thermal and mechanical mounting characteristics remain consistent across the product family.

Frequently Asked Questions (FAQ)

Q: Can I use a higher current-rated TRIAC as a substitute for the Q6004LT?

A: Yes. The BTA series parts rated at 6 A, 8 A, 10 A, and 12 A all exceed the 4 A requirement of the Q6004LT. Higher current ratings provide design margin and do not compromise circuit function when the application current demand remains at or below 4 A.

Q: What is the difference between Alternistor - Snubberless and Logic - Sensitive Gate types?

A: Alternistor - Snubberless TRIACs are optimized for AC switching without external snubber networks. Logic - Sensitive Gate TRIACs feature reduced gate trigger current (5-10 mA) for compatibility with low-power gate drive circuits. Both types are functionally compatible within the 600 V / 4 A envelope.

Q: Are all substitutes pin-compatible with the Q6004LT?

A: All listed substitutes use TO-220-3 package configuration with identical pin assignments. The Q6004LT uses TO-220-3 Isolated Tab, while most substitutes use standard TO-220-3. Verify mechanical clearance for isolated tab vs. standard tab in your specific PCB layout.

Q: Do I need to modify my circuit design to use a substitute part?

A: No circuit modification is required for substitution within the specified voltage and current parameters. Gate trigger voltage and current characteristics vary slightly among types; verify gate drive circuit compatibility with the selected substitute's Vgt and Igt specifications.

Q: Which substitute offers the best availability?

A: BTA12-600BRG and BTA12-600CRG show the highest inventory levels (212,600 and 86,000 units respectively) among active products. BTA08-600SWRG and BTA06-600CWRG also maintain substantial stock levels (26,100 and 18,654 units).

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