MM5Z22VT1 Zener Diode Equivalent & Substitute Parts

Part Overview

The MM5Z22VT1 is a 22 V Zener diode manufactured by onsemi, rated for 100 mW power dissipation in a SOD-523 surface mount package. This component is classified as obsolete, indicating that direct procurement from the original manufacturer may be limited or unavailable. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for applications requiring 22 V Zener regulation.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	22	V
Tolerance	±6%	—
Power - Max	100	mW
Impedance (Max)	55	Ohms
Current - Reverse Leakage @ Vr	50	nA @ 15.4 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOD-523	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the MM5Z22VT1 is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 22 V (nominal)
Zener voltage tolerance: ±6% or tighter
Power rating: 100 mW or greater
Impedance (Max): 55 Ohms or lower
Reverse leakage current: 50 nA @ 15.4 V or lower
Forward voltage: 900 mV @ 10 mA or lower
Operating temperature range: -65°C to 150°C or wider
Mounting type: Surface Mount
Package compatibility: SOD-523 or equivalent footprint

Substitution Categories:

Parametric Equivalents maintain identical electrical specifications and package footprint, enabling direct replacement without circuit modification.

Functional Substitutes provide superior performance characteristics (higher power rating, tighter tolerance, improved compliance status) while maintaining electrical compatibility and mechanical interchangeability.

Package Variants offer equivalent electrical performance in alternative surface mount packages, requiring PCB layout adjustment.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Package	Product Status	RoHS Status
MM5Z22VT1	onsemi	22 V	±6%	100 mW	55 Ω	SOD-523	Obsolete	Non-compliant
BZT52C22T-TP	Micro Commercial Co	22 V	±5%	100 mW	55 Ω	SOD-523	Active	ROHS3 Compliant
MM3Z22VT1G	onsemi	22 V	±5%	300 mW	55 Ω	SOD-323	Active	ROHS3 Compliant
BZT585B22T-7	Diodes Incorporated	22 V	±2%	350 mW	55 Ω	SOD-523	Active	ROHS3 Compliant
BZX585-B22,115	Nexperia USA Inc.	22 V	±2%	300 mW	55 Ω	SOD-523	Active	ROHS3 Compliant
BZX585-C22,115	Nexperia USA Inc.	22 V	±5%	300 mW	55 Ω	SOD-523	Active	ROHS3 Compliant
BZX84J-B22,115	NXP USA Inc.	22 V	±2%	550 mW	25 Ω	SOD-323F	Active	ROHS3 Compliant
CZRU52C22	Comchip Technology	22 V	±5%	150 mW	55 Ω	0603/SOD-523F	Active	ROHS3 Compliant
EDZVFHT2R22B	Rohm Semiconductor	22 V	±2.11%	150 mW	100 Ω	SOD-523	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Parametric Replacement (Identical Electrical Performance):

BZT52C22T-TP is the primary parametric equivalent to MM5Z22VT1. Both components share identical zener voltage (22 V), power rating (100 mW), impedance (55 Ω), and package (SOD-523). BZT52C22T-TP offers improved zener voltage tolerance (±5% versus ±6%) and is ROHS3 compliant with active product status, eliminating obsolescence risk.

Enhanced Performance Substitutes (Same Package, Higher Power Rating):

BZT585B22T-7 and BZX585-B22,115 provide superior power dissipation (350 mW and 300 mW respectively) while maintaining SOD-523 package compatibility. Both feature tighter zener voltage tolerance (±2%) and active product status. These components are suitable for applications requiring thermal margin or higher current handling without PCB modification.

BZX585-C22,115 offers 300 mW power rating with ±5% tolerance in SOD-523 package, matching the original tolerance specification while providing increased power capacity.

Alternative Package Options:

MM3Z22VT1G provides 300 mW power rating in SOD-323 package with ±5% tolerance. This substitute requires PCB layout modification due to different package footprint but offers higher power dissipation and active product status.

BZX84J-B22,115 delivers the highest power rating (550 mW) with superior impedance characteristics (25 Ω) in SOD-323F package. This component includes automotive qualification (AEC-Q101) and is suitable for demanding applications requiring enhanced performance specifications.

Lower Power Alternatives:

CZRU52C22 and EDZVFHT2R22B provide 150 mW power rating, suitable for applications where the original 100 mW specification provides excess capacity. Both maintain 22 V zener voltage and are ROHS3 compliant with active status.

Compliance Considerations:

All recommended substitutes are ROHS3 compliant, addressing environmental and regulatory requirements. BZX585-B22,115, BZX585-C22,115, and BZX84J-B22,115 carry automotive qualification (AEC-Q100 or AEC-Q101), enabling use in automotive and high-reliability applications.

Frequently Asked Questions (FAQ)

Q: Can BZT52C22T-TP directly replace MM5Z22VT1 without circuit modification?

A: Yes. BZT52C22T-TP is a parametric equivalent with identical zener voltage (22 V), power rating (100 mW), impedance (55 Ω), and SOD-523 package. Direct PCB substitution is possible without design changes. BZT52C22T-TP offers improved zener voltage tolerance (±5% versus ±6%) and ROHS3 compliance.

Q: What is the difference between SOD-523 and SOD-323 packages?

A: SOD-523 and SOD-323 are distinct surface mount packages with different physical dimensions and PCB footprints. SOD-523 is smaller than SOD-323. Substitutes using different packages (such as MM3Z22VT1G in SOD-323 or BZX84J-B22,115 in SOD-323F) require PCB layout modification and cannot be used as direct drop-in replacements.

Q: Why should I select a substitute with higher power rating than the original 100 mW specification?

A: Higher power rating substitutes (such as BZT585B22T-7 at 350 mW or BZX585-B22,115 at 300 mW) provide thermal margin and improved reliability in applications approaching the original power limit. These components maintain identical zener voltage and package compatibility while reducing junction temperature stress. Selection depends on actual circuit power dissipation requirements.

Q: Are automotive-qualified substitutes necessary for non-automotive applications?

A: Automotive qualification (AEC-Q100 or AEC-Q101) is not required for non-automotive applications. However, automotive-qualified components (BZX585-B22,115, BZX585-C22,115, BZX84J-B22,115, EDZVFHT2R22B) undergo enhanced reliability testing and are suitable for high-reliability, industrial, and medical applications where component quality assurance is critical.

Q: What does zener voltage tolerance mean, and why does it matter?

A: Zener voltage tolerance specifies the acceptable deviation from the nominal 22 V specification. MM5Z22VT1 has ±6% tolerance, meaning the actual zener voltage can range from 20.68 V to 23.32 V. Tighter tolerance substitutes (±2% or ±2.11%) provide more precise voltage regulation, reducing circuit performance variation. Selection depends on application voltage regulation requirements.

Q: Can I use EDZVFHT2R22B as a substitute if my circuit requires 100 mW power dissipation?

A: EDZVFHT2R22B is rated for 150 mW, which exceeds the 100 mW requirement. However, the component's impedance is 100 Ω (versus 55 Ω for MM5Z22VT1), which affects dynamic impedance characteristics. This substitute is suitable if circuit design accommodates higher impedance. Verify impedance compatibility with your specific application before selection.

Q: What is the significance of RoHS compliance status?

A: ROHS3 compliance indicates the component meets Restriction of Hazardous Substances regulations, restricting lead and other hazardous materials. MM5Z22VT1 is RoHS non-compliant, while all recommended substitutes are ROHS3 compliant. For new designs or applications subject to environmental regulations, ROHS3-compliant substitutes are required.

Q: How do I determine which substitute is best for my application?

A: Selection criteria include: (1) package compatibility (SOD-523 for direct replacement), (2) power rating requirement (100 mW minimum), (3) zener voltage tolerance (±6% or tighter), (4) compliance requirements (ROHS3 for regulated applications), and (5) product status (active preferred over obsolete). Match these criteria to your circuit requirements and supply chain constraints.

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