MMQA24VT1G Equivalent & Substitute Parts

Part Overview

The MMQA24VT1G is a 4-channel unidirectional Transient Voltage Suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection applications. This component features an 18V reverse standoff voltage with a 34.6V clamping voltage and 694mA peak pulse current (8/20µs). The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	MMQA24VT1G
Manufacturer	onsemi
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	4
Voltage - Reverse Standoff (Typ)	18V (Max)
Voltage - Clamping (Max) @ Ipp	34.6V
Current - Peak Pulse (8/20µs)	694mA
Power - Peak Pulse	150W
Operating Temperature	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	SC-74, SOT-457
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MMQA24VT1G is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Unidirectional channel configuration (4 channels required)
Voltage - Reverse Standoff: 18V to 20V range
Voltage - Clamping (Max) @ Ipp: 28V to 34.6V range
Current - Peak Pulse capability: minimum 694mA
Power - Peak Pulse: minimum 150W
Mounting Type: Surface Mount
Package compatibility: SC-74 or SOT-457 footprint

Substitute Parts Identified:

The BZA420A series (Nexperia USA Inc.) variants—BZA420A,115; BZA420A,125; and BZA420A,165—provide electrical equivalence with 20V reverse standoff, 28V clamping voltage, and 19.6W peak pulse power. These parts maintain the 4-channel unidirectional configuration and surface mount form factor.

The BZA456A series (Nexperia USA Inc.) variants—BZA456A,115; BZA456A,125; BZA456A,135; and BZA456A,165—offer alternative protection with 5.6V reverse standoff, 8V clamping voltage, 3A peak pulse current (8/20µs), and 24W peak pulse power. These are suitable for lower voltage protection applications.

The ESDA25SC6 (STMicroelectronics) provides 24V reverse standoff with 300W peak pulse power in a SOT-23-6 package, offering higher power dissipation capability for applications requiring enhanced thermal performance.

Parameter Comparison

Parameter	MMQA24VT1G	BZA420A,115	BZA420A,125	BZA420A,135	BZA420A,165	BZA456A,115	BZA456A,125	BZA456A,135	BZA456A,165	ESDA25SC6
Manufacturer	onsemi	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.	STMicroelectronics
Type	Zener	Zener	Zener	Zener	Zener	Zener	Zener	Zener	Zener	Zener
Unidirectional Channels	4	4	4	4	4	4	4	4	4	4
Voltage - Reverse Standoff (Typ)	18V	20V	20V	20V	20V	5.6V	5.6V	5.6V	5.6V	24V
Voltage - Clamping (Max) @ Ipp	34.6V	28V	28V	28V	28V	8V	8V	8V	8V	—
Current - Peak Pulse (8/20µs)	694mA	—	—	—	—	3A	3A	3A	3A	—
Power - Peak Pulse	150W	19.6W	19.6W	19.6W	19.6W	24W	24W	24W	24W	300W
Operating Temperature	-55°C ~ 150°C (TJ)	-65°C ~ 150°C (TJ)	-65°C ~ 150°C (TJ)	-65°C ~ 150°C (TJ)	-65°C ~ 150°C (TJ)	-65°C ~ 150°C (TJ)	-65°C ~ 150°C (TJ)	-65°C ~ 150°C (TJ)	-65°C ~ 150°C (TJ)	-40°C ~ 125°C (TA)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SC-74, SOT-457	6-TSOP	6-TSOP	6-TSOP	6-TSOP	6-TSOP	6-TSOP	6-TSOP	6-TSOP	SOT-23-6
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For 18V–20V Protection Applications:

The BZA420A series (all variants: BZA420A,115; BZA420A,125; BZA420A,165) from Nexperia USA Inc. are active, production-qualified components with AEC-Q100 automotive qualification and ROHS3 compliance. These parts maintain the 4-channel unidirectional configuration and are suitable for direct substitution in applications where the MMQA24VT1G was originally specified. The 20V reverse standoff and 28V clamping voltage provide equivalent protection in the specified voltage range.

For Lower Voltage Protection Applications:

The BZA456A series (all variants: BZA456A,115; BZA456A,125; BZA456A,135; BZA456A,165) from Nexperia USA Inc. are active components with AEC-Q100 automotive qualification and ROHS3 compliance. These parts are suitable for applications requiring 5.6V reverse standoff and 8V clamping voltage protection with enhanced current handling (3A peak pulse).

For High Power Dissipation Applications:

The ESDA25SC6 from STMicroelectronics is an active component with ROHS3 compliance offering 300W peak pulse power dissipation, significantly higher than the original MMQA24VT1G. This part is suitable for applications requiring enhanced thermal performance with 24V reverse standoff protection.

All substitute parts maintain MSL 1 (Unlimited) moisture sensitivity classification and REACH compliance status consistent with the original component.

Frequently Asked Questions (FAQ)

Q: Can the BZA420A series directly replace the MMQA24VT1G?

A: The BZA420A series maintains the critical electrical parameters for substitution: 4-channel unidirectional configuration, 20V reverse standoff (within the 18V specification range), and 28V clamping voltage. Both are surface mount components. Package footprint differences (6-TSOP vs. SC-74) require PCB layout verification.

Q: What is the difference between the BZA420A variants (115, 125, 165)?

A: The numeric suffixes indicate different manufacturing date codes or tape reel configurations. All variants share identical electrical specifications: 20V reverse standoff, 28V clamping voltage, 4-channel unidirectional configuration, and 19.6W peak pulse power.

Q: Why does the BZA456A series have lower voltage ratings than the MMQA24VT1G?

A: The BZA456A series is designed for lower voltage protection applications (5.6V reverse standoff, 8V clamping). This part is not suitable for applications requiring 18V–20V protection levels. Selection depends on the actual circuit protection voltage requirement.

Q: Is the ESDA25SC6 a suitable replacement for all MMQA24VT1G applications?

A: The ESDA25SC6 provides 24V reverse standoff and 300W peak pulse power, making it suitable for applications requiring higher power dissipation. However, the SOT-23-6 package differs from the SC-74 footprint, requiring PCB redesign. Operating temperature range is -40°C to 125°C (TA), narrower than the original -55°C to 150°C (TJ).

Q: What compliance certifications should I verify for production use?

A: All active substitute parts listed carry ROHS3 compliance and REACH compliance status. The Nexperia BZA420A and BZA456A series include AEC-Q100 automotive qualification. Verify specific compliance requirements for your application before final selection.

Q: Are there package footprint compatibility concerns?

A: Yes. The original MMQA24VT1G uses SC-74 (SOT-457) packaging. The BZA420A and BZA456A series use 6-TSOP packaging, and the ESDA25SC6 uses SOT-23-6 packaging. PCB layout and schematic verification is required to confirm pin compatibility and signal routing before implementation.

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