MMBZ20VALT3G Equivalent & Substitute Parts

Part Overview

The MMBZ20VALT3G is a 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, 28V maximum clamping voltage, and 1.4A peak pulse current capability in a compact SOT-23-3 package. The main part is currently listed as obsolete, making equivalent substitutes necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	17	V
Voltage - Breakdown (Min)	19	V
Voltage - Clamping (Max) @ Ipp	28	V
Current - Peak Pulse (10/1000µs)	1.4	A
Power - Peak Pulse	40	W
Operating Temperature Range	-55 to 150	°C
Package Type	SOT-23-3 (TO-236)	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the MMBZ20VALT3G is determined by strict equivalence across the following electrical and mechanical parameters:

Voltage - Reverse Standoff: 17V (typical)
Voltage - Breakdown: 19V (minimum)
Voltage - Clamping: 28V (maximum at Ipp)
Current - Peak Pulse: 1.4A (10/1000µs)
Power - Peak Pulse: 40W
Operating Temperature: -55°C to 150°C
Package: SOT-23-3 (TO-236)
Mounting: Surface Mount
Diode Type: Zener, Unidirectional (2 channels)

All identified substitutes maintain identical electrical specifications and package compatibility. Differences exist only in product status (active vs. obsolete), packaging format (Tape & Reel, Cut Tape, or bulk), manufacturer (onsemi or Nexperia), and compliance certifications.

Parameter Comparison

Parameter	MMBZ20VALT3G	MMBZ20VALT1G	SZMMBZ20VALT1G	SZMMBZ20VALT3G	MMBZ20VAL,215
Manufacturer	onsemi	onsemi	onsemi	onsemi	Nexperia USA Inc.
Product Status	Obsolete	Active	Active	Active	Active
Voltage - Reverse Standoff (Typ)	17V	17V	17V	17V	17V (Max)
Voltage - Breakdown (Min)	19V	19V	19V	19V	19V
Voltage - Clamping (Max) @ Ipp	28V	28V	28V	28V	28V
Current - Peak Pulse (10/1000µs)	1.4A	1.4A	1.4A	1.4A	1.4A
Power - Peak Pulse	40W	40W	40W	40W	40W
Operating Temperature	-55 to 150°C (TJ)	-55 to 150°C (TJ)	-55 to 150°C (TJ)	-55 to 150°C (TJ)	-55 to 150°C (TA)
Package / Case	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3	SOT-23-3
Packaging Format	—	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Tape & Reel (TR)
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
AEC-Q101 Qualification	—	—	Yes	Yes	Yes
Inventory Status	760 Pcs	4,427,300 Pcs	20,400 Pcs	25,100 Pcs	51,143 Pcs

Engineering Selection Recommendations

All four substitute parts are electrically and mechanically equivalent to the MMBZ20VALT3G and are suitable for direct replacement in new designs and production continuity.

onsemi Options (MMBZ20VALT1G, SZMMBZ20VALT1G, SZMMBZ20VALT3G): These parts maintain the original manufacturer lineage. MMBZ20VALT1G and SZMMBZ20VALT3G are available in high volume (4.4M and 25.1K units respectively) in standard Tape & Reel packaging. SZMMBZ20VALT1G and SZMMBZ20VALT3G carry AEC-Q101 automotive qualification, suitable for automotive-grade applications. SZMMBZ20VALT1G is available in Cut Tape format for lower-volume requirements.

Nexperia Option (MMBZ20VAL,215): This part is manufactured by Nexperia USA Inc. and carries AEC-Q101 automotive qualification. It is available in the highest inventory volume (51,143 units) in Tape & Reel format. The part specifies capacitance at 1MHz (65pF), providing additional characterization data.

Selection should be based on packaging requirements (Tape & Reel vs. Cut Tape), inventory availability, and whether automotive qualification is required for the application.

Frequently Asked Questions (FAQ)

Q: Can MMBZ20VALT1G directly replace MMBZ20VALT3G? A: Yes. Both parts are manufactured by onsemi with identical electrical specifications (17V standoff, 28V clamping, 1.4A peak pulse) and SOT-23-3 package. The primary difference is packaging format: MMBZ20VALT1G uses Tape & Reel, while MMBZ20VALT3G does not specify packaging. MMBZ20VALT1G is currently active and widely available.

Q: What is the difference between SZMMBZ20VALT1G and SZMMBZ20VALT3G? A: Both are onsemi automotive-grade TVS diodes with AEC-Q101 qualification. SZMMBZ20VALT1G is supplied in Cut Tape & Digi-Reel format (20,400 units available), while SZMMBZ20VALT3G is supplied in Tape & Reel format (25,100 units available). Electrical specifications are identical.

Q: Should I use the Nexperia MMBZ20VAL,215 or an onsemi substitute? A: Both are equivalent. The Nexperia part offers the highest inventory availability (51,143 units) and includes AEC-Q101 automotive qualification. Selection depends on supply chain preference, packaging requirements, and whether cross-manufacturer qualification is acceptable for your application.

Q: Are all substitutes RoHS3 compliant? A: All active substitute parts (MMBZ20VALT1G, SZMMBZ20VALT1G, SZMMBZ20VALT3G, MMBZ20VAL,215) are RoHS3 compliant. The original MMBZ20VALT3G does not specify RoHS status.

Q: Can these parts be used in automotive applications? A: SZMMBZ20VALT1G, SZMMBZ20VALT3G, and MMBZ20VAL,215 carry AEC-Q101 automotive qualification. MMBZ20VALT1G does not specify automotive qualification. Verify application requirements before selection.

Q: What is the difference between Tape & Reel and Cut Tape packaging? A: Tape & Reel packaging is supplied on continuous carrier tape in reel format, suitable for high-volume automated assembly. Cut Tape & Digi-Reel is supplied in shorter tape segments, suitable for lower-volume or mixed-component orders. Electrical performance is identical; selection is based on production volume and assembly equipment compatibility.

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