MM5Z6V8 Zener Diode Equivalent & Substitute Parts

Part Overview

The MM5Z6V8 is a 6.8 V Zener diode manufactured by onsemi in SOD-523F surface mount package with 200 mW power rating and ±6% tolerance. This component is classified as obsolete product status. Due to obsolescence, equivalent and substitute parts from active manufacturers are necessary to maintain design continuity and ensure long-term supply chain reliability. Substitute parts maintain the core electrical specifications (6.8 V nominal Zener voltage, surface mount technology, and SOD-523 family packaging) while offering improved availability and active product support.

Key Parameters

Parameter	MM5Z6V8 Specification
Voltage - Zener (Nom)	6.8 V
Tolerance	±6%
Power - Max	200 mW
Impedance (Max)	15 Ohms
Current - Reverse Leakage @ Vr	2 µA @ 4 V
Operating Temperature	-55°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	SC-79, SOD-523F
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution logic for MM5Z6V8 is based on the following critical parameters that must remain constant or compatible:

Core Electrical Requirements:

Zener voltage: 6.8 V nominal (tolerance variations acceptable within engineering design margins)
Reverse leakage current: 2 µA @ 4 V (standard specification across all candidates)
Impedance: 15 Ohms maximum (maintained across SOD-523 package family)

Mechanical & Packaging Requirements:

Mounting type: Surface Mount (mandatory)
Package family: SOD-523 or compatible small outline diode packages (SOD-523F, SOD-523, SOD-323F acceptable based on PCB layout compatibility)

Substitution Categories:

Direct Substitutes (Same Package, Active Status): Parts maintaining SOD-523 package, 6.8 V specification, and active product status with equivalent or superior power ratings.

Compatible Substitutes (Alternative Package, Active Status): Parts with 6.8 V specification and active status but different package geometry (SOD-323F) requiring PCB layout verification.

Functional Equivalents (Same Electrical Specification): Parts meeting all electrical parameters but with different power ratings or tolerance specifications, suitable when design margins permit.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Zzt (Max)	Package	Product Status	Operating Temp
MM5Z6V8	onsemi	6.8 V	±6%	200 mW	15 Ohms	SOD-523F	Obsolete	-55°C ~ 150°C
MM5Z6V8T1G	onsemi	6.8 V	±5.9%	500 mW	15 Ohms	SOD-523	Active	-65°C ~ 150°C
BZT52C6V8T-TP	Micro Commercial Co	6.8 V	±5%	100 mW	15 Ohms	SOD-523	Active	-65°C ~ 150°C
BZT52H-C6V8,115	NXP Semiconductors	6.8 V	±5%	375 mW	8 Ohms	SOD-123F	Active	-65°C ~ 150°C
BZX584C6V8_R1_00001	Panjit International Inc.	6.8 V	±5%	200 mW	15 Ohms	SOD-523	Active	-55°C ~ 150°C
BZX84J-B6V8,115	Nexperia USA Inc.	6.8 V	±2%	550 mW	15 Ohms	SOD-323F	Active	-65°C ~ 150°C
BZX84J-C6V8,115	Nexperia USA Inc.	6.8 V	±5%	550 mW	15 Ohms	SOD-323F	Active	-65°C ~ 150°C

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Recommended):

MM5Z6V8T1G (onsemi) is the primary substitute. This part maintains onsemi manufacturer continuity, offers active product status, identical 6.8 V specification, same SOD-523 package family, and superior 500 mW power rating compared to the original 200 mW specification. The ±5.9% tolerance is tighter than the original ±6%, providing improved voltage regulation characteristics. Extended operating temperature range (-65°C to 150°C) provides additional thermal margin.

BZX584C6V8_R1_00001 (Panjit International Inc.) provides exact electrical equivalence with 200 mW power rating, ±5% tolerance, and identical 15 Ohm impedance. SOD-523 package maintains PCB layout compatibility. Active product status ensures supply chain continuity. Operating temperature range matches original specification (-55°C to 150°C).

Tier 2 - Compatible Substitutes (Package Verification Required):

BZT52H-C6V8,115 (NXP Semiconductors) offers active status, AEC-Q101 automotive qualification, and improved 375 mW power rating. SOD-123F package differs from SOD-523F, requiring PCB footprint verification. Lower impedance (8 Ohms) provides superior high-frequency performance. Suitable for designs with layout flexibility.

BZX84J-B6V8,115 and BZX84J-C6V8,115 (Nexperia USA Inc.) both provide active status, AEC-Q101 automotive qualification, and 550 mW power rating. SOD-323F package requires PCB layout modification. BZX84J-B6V8,115 offers tighter ±2% tolerance; BZX84J-C6V8,115 maintains ±5% tolerance matching common design specifications.

Tier 3 - Lower Power Alternative:

BZT52C6V8T-TP (Micro Commercial Co) is suitable only for applications where 100 mW power dissipation is sufficient. Active status and ±5% tolerance are acceptable. SOD-523 package maintains layout compatibility. Use only when thermal analysis confirms power margin.

Compliance & Certification:

All substitute parts maintain REACH compliance and EAR99 ECCN classification. NXP and Nexperia parts include AEC-Q101 automotive qualification, suitable for automotive and high-reliability applications. All parts are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Frequently Asked Questions (FAQ)

Q: Can MM5Z6V8T1G directly replace MM5Z6V8 without PCB modification?

A: Yes. MM5Z6V8T1G maintains identical SOD-523 package geometry and pinout. No PCB layout changes are required. The part is a direct footprint replacement with improved specifications (500 mW vs. 200 mW, tighter tolerance, extended temperature range).

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

A: Both designations refer to the same physical package (SC-79). The "F" suffix indicates a specific manufacturing variant. Parts are mechanically and electrically interchangeable on standard PCB layouts designed for SOD-523 family components.

Q: Is BZT52C6V8T-TP suitable as a replacement if my circuit only requires 100 mW dissipation?

A: BZT52C6V8T-TP is functionally compatible only if thermal analysis confirms that maximum power dissipation in your application does not exceed 100 mW. The original MM5Z6V8 specification is 200 mW. Use this part only when design margins are verified through circuit simulation or testing.

Q: Why do some substitutes have different impedance values (8 Ohms vs. 15 Ohms)?

A: Impedance variation is a function of package design and semiconductor geometry. BZT52H-C6V8,115 (SOD-123F) exhibits 8 Ohms impedance due to different internal structure. This provides superior high-frequency performance but requires verification that your circuit design does not depend on the original 15 Ohm impedance specification.

Q: Can I use BZX84J-B6V8,115 or BZX84J-C6V8,115 if my PCB layout supports SOD-323F footprint?

A: Yes, if your PCB design accommodates SOD-323F package geometry. Both parts provide active status, automotive qualification (AEC-Q101), and superior 550 mW power rating. Verify that PCB trace routing and thermal management are compatible with the different package dimensions.

Q: What is the significance of ±2% tolerance in BZX84J-B6V8,115 compared to ±6% in MM5Z6V8?

A: Tighter tolerance (±2%) provides more precise Zener voltage regulation, reducing voltage variation across production batches. This is beneficial for precision voltage reference applications. If your circuit design does not require this precision, the ±5% or ±6% tolerance alternatives are functionally equivalent.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are RoHS3 compliant. The original MM5Z6V8 does not specify RoHS status, but all active replacements meet current environmental compliance requirements.

Q: Which substitute offers the best long-term supply chain security?

A: MM5Z6V8T1G (onsemi) and BZX584C6V8_R1_00001 (Panjit) offer the best supply continuity as direct electrical equivalents with active product status. NXP and Nexperia parts (BZT52H-C6V8,115, BZX84J series) provide additional security through automotive qualification and established high-volume production.

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