Q2004L4 TRIAC Equivalent & Substitute Parts

Part Overview

The Q2004L4 is a standard TRIAC manufactured by Littelfuse Inc., rated for 200V off-state voltage and 4A on-state current in a TO-220 isolated tab package. This component is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. The part operates across a temperature range of -40°C to 125°C and is RoHS3 compliant with unlimited moisture sensitivity rating.

Key Parameters

Parameter	Q2004L4 Specification
Voltage - Off State	200 V
Current - On State (It (RMS)) (Max)	4 A
Voltage - Gate Trigger (Vgt) (Max)	1.3 V
Current - Gate Trigger (Igt) (Max)	25 mA
Current - Hold (Ih) (Max)	30 mA
Current - Non Rep. Surge 50, 60Hz (Itsm)	46A, 55A
Operating Temperature Range	-40°C ~ 125°C (TJ)
Package / Case	TO-220-3 Isolated Tab
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the Q2004L4 is determined by the following critical parameters:

Voltage Rating: Substitute parts must equal or exceed the 200V off-state voltage requirement
Current Rating: Substitute parts must equal or exceed the 4A on-state current requirement
Gate Trigger Characteristics: Vgt and Igt parameters must be compatible with existing circuit gate drive requirements
Package Compatibility: TO-220 form factor with isolated tab configuration for thermal and electrical isolation
Temperature Range: Operating temperature capability must support -40°C to 125°C minimum
Compliance: RoHS3 compliance and unlimited MSL rating required for production continuity

The two identified substitutes exceed the Q2004L4 specifications in voltage and current ratings, providing design margin while maintaining gate trigger compatibility and package form factor equivalence.

Parameter Comparison

Parameter	Q2004L4	BT137X-600F,127	BTA06-600CRG
Manufacturer	Littelfuse Inc.	WeEn Semiconductors	STMicroelectronics
Product Status	Obsolete	Active	Active
Voltage - Off State	200 V	600 V	600 V
Current - On State (It (RMS)) (Max)	4 A	8 A	6 A
Voltage - Gate Trigger (Vgt) (Max)	1.3 V	1.5 V	1.3 V
Current - Gate Trigger (Igt) (Max)	25 mA	25 mA	25 mA
Current - Hold (Ih) (Max)	30 mA	20 mA	25 mA
Current - Non Rep. Surge 50, 60Hz (Itsm)	46A, 55A	65A, 71A	60A, 63A
Operating Temperature Range	-40°C ~ 125°C	125°C (TJ)	-40°C ~ 125°C
Package / Case	TO-220-3 Isolated Tab	TO-220-3 Full Pack, Isolated Tab	TO-220-3
RoHS Status	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

BTA06-600CRG (STMicroelectronics) is the primary substitute for the Q2004L4. This part maintains ROHS3 compliance matching the original specification, provides full temperature range coverage (-40°C to 125°C), and offers 600V voltage and 6A current ratings that exceed the original 200V/4A requirements. The gate trigger voltage of 1.3V matches the original specification exactly, ensuring circuit compatibility without modification.

BT137X-600F,127 (WeEn Semiconductors) is an alternative substitute with higher current capacity (8A) and surge current ratings. This part is actively manufactured and RoHS compliant. The gate trigger voltage specification of 1.5V represents a 0.2V increase from the original, which may require circuit evaluation in applications with marginal gate drive voltage. The operating temperature specification lists only the maximum junction temperature (125°C) without explicit minimum temperature rating.

Both substitutes are actively produced, ensuring long-term availability compared to the obsolete Q2004L4. Both maintain the TO-220 package form factor and isolated tab configuration for direct mechanical and thermal compatibility.

Frequently Asked Questions (FAQ)

Q: Can the BTA06-600CRG directly replace the Q2004L4 without circuit modification?

A: Yes. The BTA06-600CRG maintains identical gate trigger voltage (1.3V maximum), matching gate trigger current (25 mA maximum), and equivalent hold current specifications. The higher voltage and current ratings provide design margin without requiring circuit changes.

Q: What is the advantage of the higher voltage rating in the substitute parts?

A: The 600V rating in both substitutes provides protection against transient overvoltages and allows use in higher voltage applications. For circuits designed for 200V operation, this additional margin does not create compatibility issues.

Q: Are both substitute parts suitable for the same applications?

A: Both substitutes are electrically compatible with Q2004L4 circuits. The BTA06-600CRG is recommended as the primary choice due to exact gate trigger voltage matching and explicit full temperature range specification. The BT137X-600F,127 is suitable where higher current capacity (8A) is beneficial.

Q: What is the significance of the TO-220 isolated tab package?

A: The isolated tab provides electrical isolation between the mounting tab and the device terminals, allowing direct mounting to a heat sink without additional isolation hardware. Both substitutes maintain this configuration for equivalent thermal management.

Q: Are there any compliance differences between the original and substitute parts?

A: The Q2004L4 is ROHS3 compliant. The BTA06-600CRG maintains ROHS3 compliance. The BT137X-600F,127 is RoHS compliant. All three parts have unlimited moisture sensitivity rating (MSL 1), indicating no special storage or handling requirements.

Q: Can the BT137X-600F,127 be used if the gate trigger voltage difference is a concern?

A: The 1.5V maximum gate trigger voltage of the BT137X-600F,127 represents a 0.2V increase from the original 1.3V specification. In circuits with adequate gate drive voltage margin, this difference is not problematic. Circuits operating at the minimum gate drive threshold should use the BTA06-600CRG for guaranteed compatibility.

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