MM5Z56VT1 Equivalent & Substitute Parts

Part Overview

The MM5Z56VT1 is a surface mount Zener diode manufactured by onsemi, rated for 56 V nominal Zener voltage with 100 mW maximum power dissipation in SOD-523 packaging. This component is classified as obsolete, indicating discontinuation from the manufacturer. Identification of equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades.

Key Parameters

Parameter	Value
Manufacturer Part Number	MM5Z56VT1
Manufacturer	onsemi
Category	Diodes, Zener
Voltage - Zener (Nom)	56 V
Tolerance	±7%
Power - Max	100 mW
Impedance (Max)	200 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 39.2 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA
Operating Temperature	-65°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	SC-79, SOD-523
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the MM5Z56VT1 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Zener voltage rating: 56 V nominal (primary functional requirement)
Reverse leakage current: 50 nA @ 39.2 V (maintained across all substitutes)
Operating temperature range: -65°C ~ 150°C (maintained across all substitutes)
Surface mount technology: Required for PCB integration

Substitution Logic: Substitute parts are grouped into three categories based on power dissipation capability and package form factor:

Higher Power Density Substitutes (300 mW - 375 mW): BZX585-B56,115, BZX585-C56,115, and BZT52H-C56,115 provide increased power handling while maintaining SOD-523 or SOD-123F packaging. These are direct functional upgrades suitable for applications requiring enhanced thermal performance.
Maximum Power Density Substitute (550 mW): BZX84J-B56,115 and BZX84J-C56,115 offer the highest power dissipation in SOD-323F packaging, providing maximum design margin for high-current applications.
Compliance Advantage: All substitute parts are manufactured by Nexperia USA Inc., carry active product status, and comply with ROHS3 and automotive qualifications (AEC-Q100 or AEC-Q101), addressing the obsolescence and compliance limitations of the original MM5Z56VT1.

Parameter Comparison

Parameter	MM5Z56VT1	BZX585-B56,115	BZX585-C56,115	BZX84J-B56,115	BZX84J-C56,115	BZT52H-C56,115
Manufacturer	onsemi	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.
Voltage - Zener (Nom)	56 V	56 V	56 V	56 V	56 V	56 V
Tolerance	±7%	±2%	±5%	±2%	±5%	±5%
Power - Max	100 mW	300 mW	300 mW	550 mW	550 mW	375 mW
Impedance (Max)	200 Ohms	200 Ohms	200 Ohms	120 Ohms	120 Ohms	120 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 39.2 V	50 nA @ 39.2 V	50 nA @ 39.2 V	50 nA @ 39.2 V	50 nA @ 39.2 V	50 nA @ 39.2 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	1.1 V @ 100 mA	1.1 V @ 100 mA	1.1 V @ 100 mA	1.1 V @ 100 mA	900 mV @ 10 mA
Operating Temperature	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOD-523	SOD-523	SOD-523	SOD-323F	SOD-323F	SOD-123F
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Qualification	None listed	AEC-Q100	AEC-Q100	AEC-Q101	AEC-Q101	AEC-Q101

Engineering Selection Recommendations

For Direct Package Compatibility (SOD-523): Select BZX585-B56,115 or BZX585-C56,115 when PCB layout constraints require SOD-523 form factor. Both parts maintain identical package dimensions to the MM5Z56VT1 while providing 300 mW power capability (3× the original rating). BZX585-B56,115 offers ±2% tolerance; BZX585-C56,115 offers ±5% tolerance. Both carry AEC-Q100 automotive qualification and ROHS3 compliance.

For Enhanced Power Handling with Compact Packaging: Select BZT52H-C56,115 for applications requiring 375 mW dissipation in SOD-123F packaging. This part combines increased power capability with reduced footprint and carries AEC-Q101 automotive qualification.

For Maximum Power Dissipation: Select BZX84J-B56,115 or BZX84J-C56,115 when thermal design margins are critical. Both provide 550 mW power rating in SOD-323F packaging. BZX84J-B56,115 offers ±2% tolerance; BZX84J-C56,115 offers ±5% tolerance. Both carry AEC-Q101 automotive qualification.

Compliance Considerations: All substitute parts are ROHS3 compliant and carry active product status, addressing the obsolescence and regulatory limitations of the MM5Z56VT1. Selection between substitute options depends on tolerance requirements, available PCB space, and thermal design specifications.

Frequently Asked Questions (FAQ)

Q: Can BZX585-B56,115 or BZX585-C56,115 be used as direct replacements for MM5Z56VT1 without PCB modification?

A: Yes. Both BZX585 variants maintain SOD-523 packaging identical to the MM5Z56VT1, enabling direct footprint compatibility. Pin configuration and electrical characteristics are compatible. The increased power rating (300 mW vs. 100 mW) provides design margin without requiring circuit changes.

Q: What is the difference between BZX585-B56,115 and BZX585-C56,115?

A: Both parts are electrically and mechanically identical except for Zener voltage tolerance. BZX585-B56,115 specifies ±2% tolerance; BZX585-C56,115 specifies ±5% tolerance. Selection depends on circuit voltage regulation requirements. The ±2% variant provides tighter voltage control.

Q: Why do BZX84J-B56,115 and BZX84J-C56,115 have lower impedance (120 Ohms vs. 200 Ohms)?

A: Lower impedance results from the higher power rating (550 mW) and different semiconductor design. Lower impedance improves voltage regulation performance under varying load conditions. This is a functional advantage for applications requiring stable voltage reference characteristics.

Q: Can BZX84J series parts be used in place of BZX585 series parts?

A: Yes, electrically and functionally. However, BZX84J parts use SOD-323F packaging, which has different footprint dimensions than SOD-523. PCB layout modification is required. The selection depends on available board space and thermal design requirements.

Q: Are all substitute parts suitable for automotive applications?

A: Yes. All substitute parts carry automotive-grade qualifications: BZX585 series holds AEC-Q100; BZX84J and BZT52H series hold AEC-Q101. All are ROHS3 compliant. The MM5Z56VT1 carries no automotive qualification.

Q: What is the significance of the ±7% tolerance on the original MM5Z56VT1?

A: The ±7% tolerance indicates wider Zener voltage variation across the production range compared to substitute parts (±2% to ±5%). For applications requiring precise voltage regulation, substitute parts with tighter tolerance specifications provide superior performance consistency.

Q: Can the BZT52H-C56,115 be used if space is limited on the PCB?

A: Yes. BZT52H-C56,115 uses SOD-123F packaging, which is smaller than SOD-523. It provides 375 mW power capability, suitable for most applications. PCB layout modification is required due to different footprint dimensions.

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