TMA34S-L TRIAC Equivalent & Substitute Parts

Part Overview

The TMA34S-L is a standard TRIAC manufactured by Sanken Electric USA Inc., rated for 400V off-state voltage and 3A on-state current in a TO-220F package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Standard TRIACs and Alternistor-type snubberless TRIACs with compatible electrical and mechanical parameters serve as functional alternatives for applications requiring thyristor switching control.

Substiute Parts

TMA34S-L

Sanken Electric USA Inc.In Stock: 941TMA34S-L Datasheet

Current PartRFQ

BTA204X-600F,127

WeEn SemiconductorsIn Stock: 898BTA204X-600F,127 Datasheet

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Q4030LH5TP

Littelfuse Inc.In Stock: 2874Q4030LH5TP Datasheet

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T435T-600FP

STMicroelectronicsIn Stock: 2214T435T-600FP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the TMA34S-L is determined by the following criteria:

Voltage Rating: Off-state voltage must be equal to or greater than 400V to maintain blocking capability in the application circuit.

Current Rating: On-state current (It (RMS)) must be equal to or greater than 3A to handle the load without thermal stress.

Gate Trigger Parameters: Voltage gate trigger (Vgt) and current gate trigger (Igt) must be compatible with the control circuit; values at or below the original specification ensure reliable triggering.

Package and Mounting: TO-220 through-hole packages with compatible pin configurations maintain mechanical and thermal interface compatibility.

Triac Type Compatibility: Both standard TRIACs and Alternistor-type snubberless TRIACs are functionally equivalent when electrical parameters are met, though Alternistor types offer improved performance characteristics in certain applications.

Compliance: RoHS compliance status ensures regulatory alignment for new designs.

Parameter Comparison

Engineering Selection Recommendations

BTA204X-600F,127 (WeEn Semiconductors): This standard TRIAC meets the minimum current requirement (4A exceeds 3A) and maintains gate trigger compatibility (Vgt 1.5V matches the original). The 600V rating provides additional voltage margin. Product status is active with current availability. RoHS compliance is confirmed. This part is suitable for direct substitution in applications where the higher voltage rating does not create design conflicts.

Q4030LH5TP (Littelfuse Inc.): This Alternistor-type snubberless TRIAC operates at the same 400V off-state voltage as the original. The significantly higher current rating (30A) and surge capability (290A, 350A) make this suitable for applications requiring enhanced performance margins. Gate trigger parameters are slightly elevated (Vgt 2V, Igt 50mA) but remain within acceptable control circuit compatibility ranges. Product status is active. ROHS3 compliance is confirmed. This part is appropriate for designs benefiting from snubberless operation and higher current capacity.

T435T-600FP (STMicroelectronics): This Alternistor-type snubberless TRIAC provides 600V off-state voltage with 4A on-state current, exceeding the original specifications. Gate trigger voltage (Vgt 1.3V) is lower than the original, ensuring reliable triggering. Operating temperature range matches the original (-40°C ~ 125°C). Product status is active with confirmed ROHS3 compliance. This part offers balanced performance with snubberless characteristics and higher voltage rating.

Frequently Asked Questions (FAQ)

Q: Can BTA204X-600F,127 replace TMA34S-L directly in the circuit?

A: Yes. The BTA204X-600F,127 meets all minimum electrical requirements: 4A on-state current exceeds the 3A requirement, 600V off-state voltage exceeds 400V, and gate trigger parameters (Vgt 1.5V, Igt 25mA) are compatible with standard control circuits. The TO-220F package maintains mechanical compatibility. Verify that the higher voltage rating does not conflict with circuit design constraints.

Q: What is the difference between standard TRIACs and Alternistor types?

A: Standard TRIACs (BTA204X-600F,127) are conventional thyristor devices. Alternistor-type snubberless TRIACs (Q4030LH5TP, T435T-600FP) incorporate internal snubber networks, reducing electromagnetic interference and eliminating the need for external snubber circuits. Alternistor types typically offer higher surge current ratings and improved switching characteristics.

Q: Is the isolated tab package compatible with full pack packages?

A: Both isolated tab and full pack TO-220 packages are mechanically compatible for through-hole mounting. The isolated tab variant provides electrical isolation between the tab and the die, which may be required in certain thermal management or safety-critical applications. Verify the specific circuit board layout and thermal requirements before substitution.

Q: Why does Q4030LH5TP have a much higher current rating than the original?

A: The Q4030LH5TP is designed for higher-power applications. Its 30A on-state current rating reflects a different product category within the TRIAC family. It remains functionally compatible with the TMA34S-L for lower-current applications, operating well within its design margins. This provides additional design flexibility and potential cost optimization depending on procurement availability.

Q: Are all substitute parts RoHS compliant?

A: Yes. The TMA34S-L is RoHS Compliant. BTA204X-600F,127 is RoHS Compliant. Q4030LH5TP and T435T-600FP are both ROHS3 Compliant, which represents a more recent compliance standard. All parts meet regulatory requirements for new designs.

Q: What is the minimum gate trigger current required for reliable operation?

A: The original TMA34S-L specifies a maximum gate trigger current (Igt) of 20mA. All substitute parts (BTA204X-600F,127 at 25mA, Q4030LH5TP at 50mA, T435T-600FP at 35mA) have equal or higher Igt ratings. Control circuits designed for the original part will reliably trigger all substitutes. Verify gate drive circuit capability if operating at the lower end of the specified range.