TMA126S-L Equivalent & Substitute Parts

Part Overview

The TMA126S-L is a standard TRIAC thyristor rated for 600V off-state voltage and 12A on-state current, manufactured by Sanken Electric USA Inc. in a TO-220-3 Full Pack configuration. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. The part operates across a temperature range of -40°C to 125°C and is RoHS compliant with unlimited moisture sensitivity rating.

Substiute Parts

TMA126S-L

Sanken Electric USA Inc.In Stock: 2401TMA126S-L Datasheet

Current PartRFQ

Q6006L5TP

Littelfuse Inc.In Stock: 1509Q6006L5TP Datasheet

SimilarRFQ

T435T-600FP

STMicroelectronicsIn Stock: 2214T435T-600FP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TMA126S-L is determined by the following critical parameters:

• Voltage Rating (Off State): Must be 600V or higher to maintain blocking capability
• Current Rating (On State): Substitute parts must support the application's current requirements; lower ratings indicate reduced capacity
• Gate Trigger Voltage (Vgt): Must be compatible with gate drive circuitry; values within ±1V of the original are generally acceptable
• Gate Trigger Current (Igt): Must be compatible with gate drive source capability
• Mounting Type: Through Hole configuration required for PCB compatibility
• Package Type: TO-220 variants acceptable for thermal and mechanical fit
• Operating Temperature Range: Must encompass -40°C to 125°C minimum
• Compliance Status: RoHS and REACH compliance preferred for regulatory alignment

The identified substitute parts meet the 600V voltage requirement and through-hole mounting specification. However, current ratings vary, requiring application-level assessment of load compatibility.

Parameter Comparison

Engineering Selection Recommendations

Q6006L5TP (Littelfuse Inc.): This substitute maintains 600V voltage rating and through-hole TO-220 mounting. The part is currently active with ROHS3 compliance. Current rating is reduced to 6A, representing 50% of the original TMA126S-L capacity. Gate trigger voltage increases to 2.5V maximum, requiring verification of gate drive circuit compatibility. Surge current capability is proportionally reduced. This substitute is suitable for applications where load current does not exceed 6A.

T435T-600FP (STMicroelectronics): This substitute maintains 600V voltage rating and TO-220-3 Full Pack configuration matching the original package type. The part is currently active with ROHS3 compliance and REACH unaffected status. Current rating is reduced to 4A, representing 33% of the original capacity. Gate trigger voltage is 1.3V maximum, providing improved gate drive compatibility compared to the original 1.5V specification. Surge current capability is significantly reduced to 30A/32A. This substitute is suitable for applications where load current does not exceed 4A. The Alternistor snubberless topology may reduce EMI in certain switching applications.

Both substitutes meet the operating temperature range and compliance requirements. Selection depends on application current requirements and gate drive circuit specifications.

Frequently Asked Questions (FAQ)

Q: Can Q6006L5TP directly replace TMA126S-L in all applications?

A: No. Q6006L5TP has a maximum on-state current of 6A compared to TMA126S-L's 12A. Direct replacement is only valid for applications where load current does not exceed 6A. Gate trigger voltage is also higher at 2.5V maximum versus 1.5V, requiring gate drive circuit verification.

Q: What is the difference between the package types TO-220-3 Full Pack and TO-220-3 Isolated Tab?

A: TO-220-3 Full Pack has the tab electrically connected to the die, while TO-220-3 Isolated Tab has the tab electrically isolated. This affects thermal management and electrical isolation requirements. Verify your PCB design and thermal requirements before substituting between these package types.

Q: Why does T435T-600FP have lower current rating than TMA126S-L?

A: T435T-600FP is an Alternistor snubberless topology, which is a different TRIAC design optimized for reduced EMI and snubber circuit requirements. The lower current rating reflects the different internal design. This topology may be advantageous in noise-sensitive applications despite the reduced current capacity.

Q: Are both substitutes RoHS compliant?

A: Yes. Both Q6006L5TP and T435T-600FP are ROHS3 compliant, meeting current regulatory requirements. The original TMA126S-L is RoHS compliant. All three parts have unlimited moisture sensitivity rating (MSL 1).

Q: What should I verify before implementing a substitute?

A: Verify that your application's maximum load current does not exceed the substitute part's on-state current rating. Confirm gate drive circuit compatibility with the substitute's gate trigger voltage and current specifications. Validate thermal management requirements, particularly if switching from TO-220-3 Full Pack to TO-220-3 Isolated Tab. Test surge current handling in your specific application environment.