MMQA22VT1 Transient Voltage Suppressor TVS Diode Equivalent & Substitute Parts

Part Overview

The MMQA22VT1 is a unidirectional transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 17V reverse standoff voltage with a 31.7V maximum clamping voltage and 758mA peak pulse current rating (8/20µs). The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement continuity.

Substiute Parts

MMQA22VT1

onsemiIn Stock: 1246MMQA22VT1 Datasheet

Current PartRFQ

BZA420A,115

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

SimilarRFQ

BZA420A,125

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

SimilarRFQ

BZA420A,135

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

SimilarRFQ

BZA420A,165

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

SimilarRFQ

BZA456A,115

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

SimilarRFQ

BZA456A,125

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

SimilarRFQ

BZA456A,135

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

SimilarRFQ

BZA456A,165

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MMQA22VT1 TVS diode is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage - Reverse Standoff (Typ): 17V to 20V range
• Voltage - Clamping (Max) @ Ipp: 28V to 31.7V range
• Current - Peak Pulse (10/1000µs): 758mA minimum
• Power - Peak Pulse: 150W minimum
• Unidirectional Channels: 4 channels
• Mounting Type: Surface Mount
• Package / Case: SC-74 or SOT-457 compatible

The substitute parts identified from the provided list are Nexperia BZA420A and BZA456A series devices in multiple tape & reel packaging variants (,115, ,125, ,135, ,165). These parts maintain the same package footprint (SC-74, SOT-457) and channel configuration (4 unidirectional channels) as the original MMQA22VT1.

Note on BZA456A Series: While the BZA456A variants (5.6V reverse standoff, 8V clamping) differ significantly in voltage ratings from the MMQA22VT1, they are listed as substitutes in the provided data. These parts are suitable only for applications with substantially lower voltage protection requirements and should not be used as direct replacements in circuits designed for the 17V/31.7V protection levels of the MMQA22VT1.

Parameter Comparison

Engineering Selection Recommendations

BZA420A Series (,115 / ,125 / ,135 / ,165): The BZA420A variants from Nexperia are the closest electrical equivalents to the MMQA22VT1, with reverse standoff voltage of 20V and clamping voltage of 28V. All variants are in active production status with ROHS3 compliance and AEC-Q100 automotive qualification. The packaging variants (,115, ,125, ,135, ,165) represent different tape & reel configurations and do not affect electrical performance. These parts are suitable for applications requiring 20V protection levels in automotive and general-purpose circuits.

BZA456A Series (,115 / ,125 / ,135 / ,165): The BZA456A variants feature significantly lower voltage ratings (5.6V reverse standoff, 8V clamping) compared to the MMQA22VT1. These parts are active, ROHS3 compliant, and AEC-Q100 qualified. Selection of BZA456A devices is appropriate only for circuits designed for low-voltage transient suppression and should not be used as direct replacements in applications requiring the 17V/31.7V protection envelope of the original MMQA22VT1.

Compliance Considerations: All Nexperia substitute parts offer improved compliance status compared to the obsolete, RoHS non-compliant MMQA22VT1. The BZA420A and BZA456A series are ROHS3 compliant and carry AEC-Q100 automotive qualification, making them suitable for regulated applications and new designs.

Frequently Asked Questions (FAQ)

Q: Can BZA420A parts directly replace MMQA22VT1 in existing designs? A: BZA420A variants maintain the same SC-74/SOT-457 package footprint and 4-channel unidirectional configuration as the MMQA22VT1. However, the reverse standoff voltage is 20V versus 17V, and clamping voltage is 28V versus 31.7V. Circuit validation is required to confirm compatibility with the specific overvoltage protection requirements of your application.

Q: What is the difference between BZA420A,115, BZA420A,125, BZA420A,135, and BZA420A,165? A: These designations represent different tape & reel packaging configurations for the same electrical device. The suffix indicates the packaging variant used for automated assembly. Electrical performance and pin configuration are identical across all variants.

Q: Why are BZA456A parts listed as substitutes when their voltage ratings are much lower? A: BZA456A devices are included in the substitute list based on the provided data. These parts are suitable only for applications with substantially lower voltage protection requirements (5.6V standoff, 8V clamping). They should not be used as replacements in circuits designed for the 17V/31.7V protection levels of the MMQA22VT1.

Q: Are all substitute parts automotive-qualified? A: Yes, all Nexperia BZA420A and BZA456A variants listed carry AEC-Q100 automotive qualification and are ROHS3 compliant, providing improved regulatory compliance compared to the obsolete MMQA22VT1.

Q: What is the operating temperature range for substitute parts? A: All Nexperia substitute parts operate across -65°C to 150°C (TJ), which exceeds the -55°C to 150°C range of the original MMQA22VT1, providing extended low-temperature performance.

Q: Are there inventory considerations when selecting a substitute? A: Inventory levels vary across the substitute variants. BZA420A,115 has 12,150 units in stock, BZA420A,125 has 6,964 units, BZA420A,135 has 731 units, and BZA420A,165 has 1,138 units. BZA456A variants range from 797 to 15,300 units. Availability should be confirmed for production requirements.