MMQA12VT1 Equivalent & Substitute Parts

Part Overview

The MMQA12VT1 is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 9.1V reverse standoff voltage with a 17.3V maximum clamping voltage and 1.39A peak pulse current rating (8/20µs). The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

MMQA12VT1

onsemiIn Stock: 1271MMQA12VT1 Datasheet

Current PartRFQ

MMQA12VT1G

onsemiIn Stock: 110292MMQA12VT1G Datasheet

DirectRFQ

BZA420A,115

Nexperia USA Inc.In Stock: 12207BZA420A,115 Datasheet

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BZA420A,125

Nexperia USA Inc.In Stock: 7007BZA420A,125 Datasheet

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BZA420A,135

Nexperia USA Inc.In Stock: 813BZA420A,135 Datasheet

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BZA420A,165

Nexperia USA Inc.In Stock: 1236BZA420A,165 Datasheet

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BZA456A,115

Nexperia USA Inc.In Stock: 15343BZA456A,115 Datasheet

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BZA456A,125

Nexperia USA Inc.In Stock: 836BZA456A,125 Datasheet

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BZA456A,135

Nexperia USA Inc.In Stock: 11108BZA456A,135 Datasheet

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BZA456A,165

Nexperia USA Inc.In Stock: 11152BZA456A,165 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MMQA12VT1 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage - Reverse Standoff: 9.1V (Max)
• Voltage - Clamping (Max) @ Ipp: 17.3V
• Current - Peak Pulse (10/1000µs): 1.39A (8/20µs)
• Unidirectional Channels: 4
• Mounting Type: Surface Mount
• Package / Case: SC-74, SOT-457

Direct Equivalent: The MMQA12VT1G from onsemi is a direct functional equivalent with identical electrical specifications. The primary distinction is packaging format (Tape & Reel vs. bulk) and product status (Active vs. Obsolete). This part maintains full electrical and thermal compatibility.

Similar Alternatives: The BZA420A and BZA456A series from Nexperia USA Inc. represent alternative TVS diode solutions with different voltage and current ratings. These parts are listed in the original MMQA12VT1 substitute field but operate at different voltage levels (20V standoff for BZA420A series; 5.6V standoff for BZA456A series) and therefore are not direct functional replacements. Selection of these alternatives requires circuit-level voltage compatibility analysis.

Parameter Comparison

Engineering Selection Recommendations

Direct Replacement (Recommended for Obsolescence Mitigation): MMQA12VT1G is the primary recommended substitute. This part maintains identical electrical specifications, thermal performance, and mechanical compatibility with the original MMQA12VT1. The transition from obsolete to active product status ensures long-term supply availability. The upgrade from RoHS non-compliant to ROHS3 compliant status aligns with current regulatory requirements and supply chain standards.

Alternative Solutions (Voltage-Dependent Applications): The BZA420A and BZA456A series from Nexperia USA Inc. are alternative TVS diode solutions suitable only for applications where the circuit voltage requirements differ from the original 9.1V standoff specification. These parts carry AEC-Q100 automotive qualification, indicating suitability for automotive and high-reliability applications. Selection of these alternatives requires verification that the higher (BZA420A: 20V) or lower (BZA456A: 5.6V) standoff voltages are compatible with the protected circuit.

Compliance Considerations: All recommended substitutes comply with ROHS3 and REACH regulations. The original MMQA12VT1 is RoHS non-compliant; migration to MMQA12VT1G or alternative parts ensures compliance with current environmental and supply chain requirements.

Frequently Asked Questions (FAQ)

Q: Can MMQA12VT1G be used as a direct replacement for MMQA12VT1? A: Yes. MMQA12VT1G is a direct functional equivalent with identical voltage ratings (9.1V reverse standoff, 17.3V clamping), current ratings (1.39A peak pulse), and thermal specifications (-55°C to 150°C). The primary differences are packaging format (Tape & Reel) and product status (Active vs. Obsolete).

Q: What is the difference between the BZA420A and BZA456A series? A: The BZA420A series operates at 20V reverse standoff with 28V clamping voltage, while the BZA456A series operates at 5.6V reverse standoff with 8V clamping voltage. Neither series matches the 9.1V standoff specification of the MMQA12VT1. These parts are suitable only for circuits designed for different voltage protection levels.

Q: Why is the package different for Nexperia alternatives? A: The BZA420A and BZA456A series use 6-TSOP packaging, while the MMQA12VT1 uses SC-74 (SOT-457) packaging. Package differences require PCB layout modifications and are not pin-compatible without redesign.

Q: Are the Nexperia alternatives suitable for automotive applications? A: Yes. The BZA420A and BZA456A series carry AEC-Q100 automotive qualification. However, this qualification does not address the voltage mismatch with the original MMQA12VT1 specification. Automotive suitability must be evaluated in conjunction with circuit voltage requirements.

Q: What compliance advantages does MMQA12VT1G offer? A: MMQA12VT1G is ROHS3 compliant and REACH unaffected, compared to the RoHS non-compliant status of the original MMQA12VT1. This upgrade ensures compatibility with current supply chain requirements and environmental regulations.

Q: Can I use BZA420A or BZA456A if MMQA12VT1G is unavailable? A: Only if your circuit design permits operation at the alternative voltage levels (20V or 5.6V standoff). Direct substitution without circuit analysis is not recommended, as voltage mismatch will result in incorrect overvoltage protection performance.