Q2004F31 Equivalent & Substitute Parts

Part Overview

The Q2004F31 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-202 through-hole package. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The part operates across a temperature range of -40°C to 125°C and is RoHS3 compliant.

Substiute Parts

Q2004F31

Littelfuse Inc.In Stock: 1037Q2004F31 Datasheet

Current PartRFQ

BT137-600E,127

WeEn SemiconductorsIn Stock: 39327BT137-600E,127 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Q2004F31 is determined by the following critical parameters:

• Triac type classification (Logic - Sensitive Gate)
• Gate trigger voltage (Vgt) and current (Igt) compatibility
• Hold current (Ih) specification
• RoHS3 compliance status
• Through-hole mounting capability

The BT137-600E,127 qualifies as a substitute based on matching triac type, gate trigger characteristics, and hold current specifications. While the substitute exhibits higher voltage and current ratings, these represent design margin improvements rather than incompatibilities, as the substitute can operate safely in applications designed for the original part's specifications.

Parameter Comparison

Engineering Selection Recommendations

The BT137-600E,127 is an active product with current manufacturing support and RoHS3 compliance, addressing the obsolescence status of the Q2004F31. Both components share identical gate trigger current and hold current specifications, ensuring functional compatibility in gate drive circuits.

Package transition from TO-202 Long Tab to TO-220-3 requires PCB layout modification. The substitute's higher voltage and current ratings provide operational margin for the original application without introducing functional incompatibility. Active product status ensures long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the BT137-600E,127 directly replace the Q2004F31 without circuit modification?

A: Gate drive compatibility is maintained through matching Igt and Ih specifications. PCB layout must be adapted for the TO-220-3 package. The higher voltage and current ratings do not require circuit changes for applications within the original part's operating envelope.

Q: What is the primary difference between these two parts?

A: The BT137-600E,127 offers higher voltage (600 V vs. 200 V) and current (8 A vs. 4 A) ratings, lower gate trigger voltage (1.5 V vs. 2 V), and active product status. Both maintain identical gate trigger current and hold current specifications.

Q: Are there package compatibility considerations?

A: Yes. The Q2004F31 uses TO-202 Long Tab packaging, while the BT137-600E,127 uses TO-220-3. Physical footprint and thermal management characteristics differ. PCB redesign is required for package transition.

Q: Does the substitute meet the same compliance requirements?

A: Both parts are RoHS3 compliant. The substitute's active product status ensures continued compliance certification and manufacturing support.

Q: What is the operating temperature range difference?

A: The Q2004F31 specifies -40°C to 125°C. The BT137-600E,127 specifies 125°C maximum. Applications requiring sub-zero operation must account for this specification difference.