Q2004L3 TRIAC Equivalent & Substitute Parts

Part Overview

The Q2004L3 is a Logic - Sensitive Gate TRIAC manufactured by Littelfuse Inc., rated for 200 V off-state voltage and 4 A on-state current in a TO-220 Isolated Tab package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility through matching TRIAC type, gate sensitivity characteristics, and through-hole mounting configuration while accommodating voltage and current rating differences in application-specific contexts.

Substiute Parts

Q2004L3

Littelfuse Inc.In Stock: 978Q2004L3 Datasheet

Current PartRFQ

BT137X-600E,127

WeEn SemiconductorsIn Stock: 5276BT137X-600E,127 Datasheet

MFR RecommendedRFQ

BTA06-600SWRG

STMicroelectronicsIn Stock: 17399BTA06-600SWRG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the Q2004L3 is based on the following criteria:

• TRIAC Type: Both substitute parts maintain Logic - Sensitive Gate classification, ensuring gate sensitivity and control characteristics remain consistent with the original design.
• Gate Trigger Parameters: Voltage - Gate Trigger (Vgt) and Current - Gate Trigger (Igt) specifications are preserved or improved across substitutes, maintaining gate drive compatibility.
• Mounting Configuration: All substitute parts use through-hole mounting in TO-220 package variants, ensuring mechanical and electrical interface compatibility.
• Hold Current (Ih): Substitute parts maintain or reduce hold current specifications, ensuring latching behavior remains within acceptable design parameters.
• Voltage and Current Ratings: Substitute parts feature equal or higher voltage and current ratings, providing design margin and broader application compatibility.
• Compliance: All substitute parts maintain ROHS3 compliance and EAR99 classification, matching regulatory and export requirements of the original component.

Parameter Comparison

Engineering Selection Recommendations

BT137X-600E,127 (WeEn Semiconductors): This substitute provides the highest current rating at 8 A and 600 V voltage rating. It is classified as active product status with ROHS3 compliance and REACH Affected designation. The gate trigger voltage specification of 1.5 V is marginally higher than the original 1.3 V. This part is suitable for applications requiring higher current capacity and voltage margin.

BTA06-600SWRG (STMicroelectronics): This substitute matches the original gate trigger voltage specification at 1.3 V and provides 600 V voltage rating with 6 A current capacity. It maintains active product status, ROHS3 compliance, and includes full operating temperature range specification (-40°C ~ 125°C). The hold current specification is reduced to 15 mA, providing improved latching characteristics. This part offers the closest electrical alignment to the original Q2004L3 while providing enhanced voltage and current ratings.

Both substitute parts are active products with established supply chains and full regulatory compliance, addressing the obsolescence of the Q2004L3.

Frequently Asked Questions (FAQ)

Q: Can the BT137X-600E,127 or BTA06-600SWRG directly replace the Q2004L3 in existing designs?

A: Both parts maintain Logic - Sensitive Gate TRIAC classification and through-hole TO-220 mounting, ensuring functional compatibility. The higher voltage and current ratings provide design margin. Gate trigger parameters remain within acceptable ranges for control circuit compatibility. PCB layout and thermal management should be verified for the specific application.

Q: What is the difference between the two substitute options?

A: The BT137X-600E,127 provides higher current capacity (8 A vs. 6 A) and uses a full pack isolated tab variant. The BTA06-600SWRG matches the original gate trigger voltage specification more closely (1.3 V) and maintains the full operating temperature range (-40°C ~ 125°C). Selection depends on application current requirements and temperature operating conditions.

Q: Are there package compatibility considerations?

A: The Q2004L3 uses TO-220-3 Isolated Tab. The BT137X-600E,127 uses TO-220-3 Full Pack Isolated Tab, and the BTA06-600SWRG uses standard TO-220-3. All three are through-hole packages with compatible pin configurations for direct PCB substitution. Verify thermal pad isolation requirements for your specific application.

Q: Do the substitute parts meet the same compliance requirements?

A: Both substitute parts are ROHS3 compliant and classified as EAR99 for export control, matching the original Q2004L3 specifications. The BTA06-600SWRG is REACH Unaffected, while the BT137X-600E,127 is REACH Affected. Verify REACH compliance requirements for your end application and geographic market.

Q: What is the significance of the gate trigger voltage difference in the BT137X-600E,127?

A: The BT137X-600E,127 specifies a maximum gate trigger voltage of 1.5 V compared to 1.3 V in the original Q2004L3. This represents a 0.2 V increase and may require gate drive circuit verification to ensure adequate gate current delivery at the specified voltage level. The 10 mA gate trigger current specification remains unchanged.