Q4004F41 Equivalent & Substitute Parts

Part Overview

The Q4004F41 is a standard TRIAC rated for 400 V off-state voltage and 4 A on-state current in a TO-202 through-hole package, manufactured by Littelfuse Inc. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement planning. Standard TRIACs in this voltage and current class are used in AC switching applications requiring reliable gate-triggered control.

Substiute Parts

Q4004F41

Littelfuse Inc.In Stock: 6209Q4004F41 Datasheet

Current PartRFQ

BT137-600E,127

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Q4004F41 is determined by the following critical parameters:

• Voltage Rating: The substitute must support the 400 V off-state voltage requirement or higher
• Current Rating: The substitute must support at least 4 A on-state current
• Gate Trigger Characteristics: Gate trigger voltage and current must be compatible with existing circuit design
• Package Compatibility: Physical form factor and pin configuration must accommodate board layout
• Temperature Range: Operating temperature limits must meet application requirements
• Compliance: RoHS3 compliance status must be maintained

The BT137-600E,127 qualifies as a substitute based on exceeding the voltage and current specifications of the Q4004F41, while maintaining through-hole mounting and RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

The BT137-600E,127 is an active product from WeEn Semiconductors with current manufacturing status and full RoHS3 compliance. This substitute exceeds the electrical specifications of the obsolete Q4004F41 across voltage rating (600 V vs. 400 V), on-state current (8 A vs. 4 A), and surge current capacity. The BT137-600E,127 features a sensitive-gate design with lower gate trigger requirements (1.5 V vs. 2.5 V), which may reduce gate drive circuit complexity in new designs.

Physical package differences exist: the Q4004F41 uses TO-202 Long Tab while the BT137-600E,127 uses TO-220-3. Board layout modifications are required to accommodate the different package footprint. Both components maintain through-hole mounting technology and operate within compatible temperature ranges for standard industrial applications.

Frequently Asked Questions (FAQ)

Q: Can the BT137-600E,127 directly replace the Q4004F41 without circuit modifications?

A: Electrical substitution is feasible due to superior voltage and current ratings. However, physical package differences (TO-202 vs. TO-220-3) require PCB layout changes. Gate trigger characteristics differ (1.5 V vs. 2.5 V), which may affect gate drive circuit design.

Q: What is the significance of the sensitive-gate design in the BT137-600E,127?

A: The BT137-600E,127 is classified as a Logic - Sensitive Gate TRIAC, requiring lower gate trigger voltage (1.5 V maximum) compared to the standard Q4004F41 (2.5 V maximum). This reduces gate drive current requirements and may simplify control circuitry.

Q: Are both components RoHS3 compliant?

A: Yes, both the Q4004F41 and BT137-600E,127 are ROHS3 compliant, meeting environmental and regulatory requirements for industrial and commercial applications.

Q: What are the package considerations for substitution?

A: The Q4004F41 uses TO-202 Long Tab packaging while the BT137-600E,127 uses TO-220-3 packaging. These are different physical form factors requiring PCB redesign. Pin configuration and thermal characteristics differ between packages.

Q: Is the BT137-600E,127 suitable for applications requiring -40°C minimum operating temperature?

A: The BT137-600E,127 datasheet specifies 125°C as the maximum junction temperature but does not explicitly state a minimum operating temperature in the provided parameters. Verification against full datasheet specifications is necessary for applications requiring -40°C operation.