MM5Z68V Equivalent & Substitute Parts

Part Overview

The MM5Z68V is a 68 V Zener diode manufactured by onsemi, rated for 200 mW power dissipation in a surface mount SOD-523F package. This component is classified as obsolete, indicating that direct procurement from original sources 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 68 V Zener diode functionality.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	68 V
Tolerance	±6%
Power - Max	200 mW
Impedance (Max)	240 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 47.6 V
Operating Temperature	-55°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	SOD-523F
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MM5Z68V is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 68 V (exact match required)
Current - Reverse Leakage @ Vr: 50 nA @ 47.6 V (exact match required)
Mounting Type: Surface Mount (required)
Moisture Sensitivity Level: 1 (Unlimited) (required)

Secondary Compatibility Parameters:

Tolerance: ±6% or tighter acceptable
Impedance (Max): 240 Ohms or lower acceptable
Operating Temperature: Must encompass or exceed -55°C ~ 150°C range
Power - Max: 200 mW or higher acceptable

Package Considerations: Substitute parts may utilize different surface mount packages (SOT-23-3, SOD-123F, SOD-323F, SOD-523) provided all electrical parameters remain within acceptable ranges. Package selection depends on circuit board layout and assembly process compatibility.

All substitute parts listed maintain identical zener voltage and reverse leakage specifications, ensuring functional equivalence in voltage regulation and protection applications.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Ir @ Vr	Temp Range	Package	Status
MM5Z68V	onsemi	68 V	±6%	200 mW	240 Ω	50 nA @ 47.6 V	-55°C ~ 150°C	SOD-523F	Obsolete
BZX84C68LT1G	onsemi	68 V	±6%	225 mW	240 Ω	50 nA @ 47.6 V	-65°C ~ 150°C	SOT-23-3	Active
BZT52H-C68,115	NXP Semiconductors	68 V	±5%	375 mW	160 Ω	50 nA @ 47.6 V	-65°C ~ 150°C	SOD-123F	Active
BZX585-B68,115	Nexperia USA Inc.	68 V	±2%	300 mW	240 Ω	50 nA @ 47.6 V	-65°C ~ 150°C	SOD-523	Active
BZX585-C68,115	Nexperia USA Inc.	68 V	±5%	300 mW	240 Ω	50 nA @ 47.6 V	-65°C ~ 150°C	SOD-523	Active
BZX84J-B68,115	Nexperia USA Inc.	68 V	±2%	550 mW	160 Ω	50 nA @ 47.6 V	-65°C ~ 150°C	SOD-323F	Active
BZX84J-C68,115	NXP Semiconductors	68 V	±5%	550 mW	160 Ω	50 nA @ 47.6 V	-65°C ~ 150°C	SOD-323F	Active

Engineering Selection Recommendations

Direct Replacement (Same Package): BZX585-B68,115 and BZX585-C68,115 are the most direct substitutes, maintaining the SOD-523 package form factor compatible with MM5Z68V circuit board layouts. Both parts are active products with automotive-grade qualification (AEC-Q100), providing enhanced reliability for production environments. BZX585-B68,115 offers ±2% tolerance versus the original ±6%, improving voltage regulation precision.

Higher Power Capability Substitutes: BZX84J-B68,115 and BZX84J-C68,115 provide 550 mW power dissipation in SOD-323F packages, suitable for applications requiring increased thermal headroom. Both carry automotive qualification (AEC-Q101) and feature reduced impedance (160 Ω), improving transient response characteristics. These parts require PCB layout modification to accommodate the different package footprint.

Compact Package Alternative: BZX84C68LT1G from onsemi offers 225 mW in a SOT-23-3 package, maintaining onsemi manufacturer continuity. This part is active and RoHS3 compliant, with extended temperature range (-65°C ~ 150°C). Package change requires circuit board redesign.

High-Power Option: BZT52H-C68,115 delivers 375 mW in SOD-123F package with automotive qualification (AEC-Q101) and reduced impedance (160 Ω). This part bridges power requirements between the original 200 mW specification and higher-power applications.

All substitute parts maintain identical zener voltage (68 V) and reverse leakage current (50 nA @ 47.6 V) specifications, ensuring functional compatibility in voltage regulation and transient protection circuits.

Frequently Asked Questions (FAQ)

Q: Can BZX585-B68,115 directly replace MM5Z68V without circuit modification?

A: BZX585-B68,115 maintains the same SOD-523 package footprint and identical electrical specifications (68 V zener voltage, 50 nA reverse leakage). Direct PCB substitution is possible without circuit redesign. The ±2% tolerance improvement over the original ±6% enhances voltage regulation accuracy.

Q: What is the primary difference between BZX585-B68,115 and BZX585-C68,115?

A: Both parts share identical package (SOD-523), power rating (300 mW), impedance (240 Ω), and temperature range. The distinction is tolerance specification: BZX585-B68,115 provides ±2% tolerance while BZX585-C68,115 provides ±5% tolerance. Application voltage regulation requirements determine which tolerance grade is appropriate.

Q: Why do BZX84J-B68,115 and BZX84J-C68,115 have lower impedance (160 Ω) than the original MM5Z68V (240 Ω)?

A: Lower impedance indicates improved dynamic response to transient voltage changes. This characteristic is inherent to the SOD-323F package design and higher power rating (550 mW). Applications sensitive to voltage transients benefit from this improved performance, though it is not required for basic voltage regulation.

Q: Are all substitute parts automotive-qualified?

A: BZX585-B68,115, BZX585-C68,115, BZX84J-B68,115, and BZX84J-C68,115 carry automotive qualification (AEC-Q100 or AEC-Q101). BZX84C68LT1G and BZT52H-C68,115 do not list automotive qualification in provided specifications. Automotive application requirements determine qualification necessity.

Q: What package considerations apply when selecting a substitute?

A: MM5Z68V uses SOD-523F package. BZX585 series maintains SOD-523 compatibility for direct board substitution. BZX84J series uses SOD-323F (larger footprint), and BZX84C68LT1G uses SOT-23-3 (smaller footprint). Package selection depends on available PCB space and assembly equipment compatibility. Footprint changes require circuit board redesign.

Q: Can higher power-rated substitutes be used in applications designed for 200 mW?

A: Yes. Higher power ratings (225 mW, 300 mW, 375 mW, 550 mW) are acceptable in applications designed for 200 mW operation. The component will operate within its thermal limits with additional margin. Zener voltage and reverse leakage specifications remain identical, ensuring functional equivalence.

Q: What is the significance of Moisture Sensitivity Level 1 (Unlimited)?

A: MSL 1 indicates unlimited floor life without baking requirements prior to reflow soldering. All listed parts maintain MSL 1 classification, ensuring identical moisture handling procedures and storage requirements.

Q: Are all substitute parts RoHS3 compliant?

A: BZX585-B68,115, BZX585-C68,115, BZX84J-B68,115, BZX84J-C68,115, and BZX84C68LT1G are confirmed RoHS3 compliant. BZT52H-C68,115 does not list RoHS status in provided specifications. Environmental compliance requirements determine necessity for specific applications.

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