MM3Z68VT1G Equivalent & Substitute Parts

Part Overview

The MM3Z68VT1G is a 68 V Zener diode rated for 300 mW power dissipation in a surface mount SOD-323 package, manufactured by onsemi. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. The part maintains RoHS3 compliance and operates across the industrial temperature range of -65°C to 150°C.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	68	V
Tolerance	±6%	—
Power - Maximum	300	mW
Impedance (Maximum)	240	Ohms
Current - Reverse Leakage @ Vr	50 nA @ 47.6 V	—
Voltage - Forward (Maximum) @ If	900 mV @ 10 mA	—
Operating Temperature Range	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOD-323 (SC-76)	—

Substitute Part Grouping Explanation

Substitution of the MM3Z68VT1G is determined by strict equivalence in the following electrical and mechanical parameters:

Critical Parameters for Substitution:

Zener voltage: 68 V nominal
Package type: SOD-323 surface mount
Operating temperature range: -65°C to 150°C minimum
RoHS3 compliance and MSL rating

Acceptable Variation Parameters:

Power rating: 225 mW to 300 mW (substitutes with lower power ratings are acceptable if circuit design permits)
Voltage tolerance: ±2% to ±6% (tighter tolerances are acceptable)
Forward voltage characteristics: variations within specified test conditions are acceptable

Substitute parts are grouped into two categories: parametric equivalents with identical electrical specifications and alternative package configurations with equivalent electrical performance.

Parameter Comparison

Parameter	MM3Z68VT1G	SZMM3Z68VT1G	BZX84C68LT1G	BZX384-B68,115	BZX384-B68F	BZX384-B68Z	BZX384-C68,115
Manufacturer	onsemi	onsemi	onsemi	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.
Voltage - Zener (Nom)	68 V	68 V	68 V	68 V	68 V	68 V	68 V
Tolerance	±6%	±6%	±6%	±2%	±2%	±2%	±5%
Power - Max	300 mW	300 mW	225 mW	300 mW	300 mW	300 mW	300 mW
Impedance (Max)	240 Ω	240 Ω	240 Ω	240 Ω	240 Ω	240 Ω	240 Ω
Current - Reverse Leakage @ Vr	50 nA @ 47.6 V	50 nA @ 47.6 V	50 nA @ 47.6 V	50 nA @ 47.6 V	50 nA @ 47.6 V	50 nA @ 47.6 V	50 nA @ 47.6 V
Operating Temperature	-65 to 150°C	-65 to 150°C	-65 to 150°C	-65 to 150°C	-65 to 150°C	-65 to 150°C	-65 to 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOD-323	SOD-323	SOT-23-3	SOD-323	SOD-323	SOD-323	SOD-323
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: SZMM3Z68VT1G

The SZMM3Z68VT1G is the optimal direct replacement for the obsolete MM3Z68VT1G. This part maintains identical electrical specifications (68 V, 300 mW, ±6% tolerance) and package configuration (SOD-323). The SZMM3Z68VT1G is manufactured by onsemi with active product status, RoHS3 compliance, and AEC-Q101 automotive qualification. This part provides seamless integration into existing designs without circuit modification.

Secondary Recommendation: BZX384-B68Z

The BZX384-B68Z manufactured by Nexperia USA Inc. is a parametric equivalent with active product status. This part maintains the 68 V zener voltage, 300 mW power rating, and SOD-323 package. The tighter ±2% tolerance provides improved voltage accuracy compared to the original ±6% specification. This part is suitable for applications where enhanced voltage precision is beneficial.

Alternative Recommendation: BZX384-B68,115

The BZX384-B68,115 is functionally equivalent to the BZX384-B68Z with identical electrical parameters and active status. Selection between these two Nexperia variants depends on packaging and supply chain considerations.

Package Alternative: BZX84C68LT1G

The BZX84C68LT1G offers equivalent electrical performance with a different surface mount package (SOT-23-3 instead of SOD-323). This part is rated for 225 mW maximum power, which is lower than the original 300 mW specification. This part is suitable only for applications where the reduced power rating does not exceed circuit requirements.

Tolerance Variant: BZX384-C68,115

The BZX384-C68,115 provides 300 mW power rating and SOD-323 package with ±5% tolerance, positioned between the original ±6% and the ±2% variants. This part is suitable for applications requiring improved but not maximum voltage precision.

Frequently Asked Questions (FAQ)

Q: Can the BZX84C68LT1G replace the MM3Z68VT1G in all applications?

A: The BZX84C68LT1G is electrically equivalent in zener voltage and impedance but is rated for 225 mW maximum power compared to the original 300 mW. This part is suitable only for circuits where power dissipation does not exceed 225 mW. The SOT-23-3 package differs from the original SOD-323, requiring PCB layout modification.

Q: What is the difference between the BZX384-B68Z and BZX384-B68,115?

A: Both parts are manufactured by Nexperia USA Inc. with identical electrical specifications (68 V, 300 mW, ±2% tolerance, SOD-323 package). The difference lies in packaging format and supply chain designation. Both are functionally interchangeable.

Q: Is the SZMM3Z68VT1G a direct replacement for the MM3Z68VT1G?

A: Yes. The SZMM3Z68VT1G maintains identical zener voltage (68 V), power rating (300 mW), tolerance (±6%), package (SOD-323), and operating temperature range (-65°C to 150°C). The SZMM3Z68VT1G is manufactured by onsemi with active product status and AEC-Q101 automotive qualification.

Q: Why do some substitute parts have ±2% tolerance instead of ±6%?

A: The BZX384 series from Nexperia offers tighter voltage tolerance specifications. A ±2% tolerance is a subset of ±6% tolerance, meaning parts with ±2% tolerance meet the original ±6% requirement with improved accuracy. These parts are suitable for applications requiring enhanced voltage precision.

Q: Can I use the BZX384-C68,115 instead of the BZX384-B68Z?

A: Both parts are manufactured by Nexperia USA Inc. with 68 V zener voltage, 300 mW power rating, and SOD-323 package. The BZX384-C68,115 has ±5% tolerance while the BZX384-B68Z has ±2% tolerance. The BZX384-B68Z provides tighter voltage control. Selection depends on circuit tolerance requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain RoHS3 compliance and MSL rating of 1 (Unlimited), matching the original MM3Z68VT1G specifications.

Q: What is the impact of package differences between SOD-323 and SOT-23-3?

A: SOD-323 and SOT-23-3 are different surface mount packages with different footprints and pin configurations. The BZX84C68LT1G in SOT-23-3 requires PCB layout modification compared to the original SOD-323 package. Electrical performance is equivalent, but physical integration differs.

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