MM5Z3V3 Equivalent & Substitute Parts

Part Overview

The MM5Z3V3 is a Zener diode manufactured by onsemi, rated at 3.3 V nominal with 200 mW maximum power dissipation in a surface mount SOD-523F package. This component is classified as obsolete, indicating that direct procurement from the original manufacturer is no longer available. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.3	V
Tolerance	±6%	-
Power - Max	200	mW
Impedance (Max)	95	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 1 V
Operating Temperature	-55°C ~ 150°C	-
Mounting Type	Surface Mount	-
Package / Case	SC-79, SOD-523F	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the MM5Z3V3 is determined by the following critical parameters:

Electrical Compatibility:

Zener voltage must be 3.3 V nominal
Impedance (Zzt) must be 95 Ohms maximum
Reverse leakage current must be 5 µA @ 1 V
Tolerance must be within acceptable design margins (±2% to ±6%)

Thermal & Environmental Compatibility:

Operating temperature range must encompass or exceed -55°C ~ 150°C
Moisture sensitivity level must be 1 (Unlimited)

Mechanical & Packaging Compatibility:

Mounting type must be surface mount
Package options include SOD-523, SOD-523F, or SOD-323F (different form factors with equivalent electrical performance)

Regulatory & Compliance:

RoHS3 compliance preferred for new active parts
REACH unaffected status required

Substitute parts are grouped into two categories: direct equivalents (same package, same power rating) and functional equivalents (same electrical specifications, alternative packages with equal or higher power ratings).

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Ir @ Vr	Temp Range	Package	Status
MM5Z3V3	onsemi	3.3 V	±6%	200 mW	95 Ω	5 µA @ 1 V	-55°C ~ 150°C	SOD-523F	Obsolete
MM5Z3V3T1G	onsemi	3.3 V	±6.1%	500 mW	95 Ω	5 µA @ 1 V	-65°C ~ 150°C	SOD-523	Active
BZX584C3V3_R1_00001	Panjit International Inc.	3.3 V	±5%	200 mW	95 Ω	5 µA @ 1 V	-55°C ~ 150°C	SOD-523	Active
BZX585-B3V3,115	Nexperia USA Inc.	3.3 V	±2%	300 mW	95 Ω	5 µA @ 1 V	-65°C ~ 150°C	SOD-523	Active
BZX585-B3V3,135	Nexperia USA Inc.	3.3 V	±2%	300 mW	95 Ω	5 µA @ 1 V	-65°C ~ 150°C	SOD-523	Active
BZX84J-B3V3,115	Nexperia USA Inc.	3.3 V	±2%	550 mW	95 Ω	5 µA @ 1 V	-65°C ~ 150°C	SOD-323F	Active
BZX84J-C3V3,115	Nexperia USA Inc.	3.3 V	±5%	550 mW	95 Ω	5 µA @ 1 V	-65°C ~ 150°C	SOD-323F	Active
PZU3.3B,115	NXP USA Inc.	3.3 V	-	310 mW	-	-	-	SOD-323F	Active

Engineering Selection Recommendations

Direct Equivalent (Same Package, Same Power Rating):

BZX584C3V3_R1_00001 (Panjit International Inc.) is the closest functional equivalent to MM5Z3V3. Both devices feature 3.3 V nominal zener voltage, 200 mW maximum power dissipation, and SOD-523 package. This part is active and RoHS3 compliant, providing immediate availability without design modification.

Preferred Upgrade Path (Higher Power Rating, Same Package):

MM5Z3V3T1G (onsemi) and BZX585-B3V3,115 / BZX585-B3V3,135 (Nexperia USA Inc.) offer enhanced power handling (500 mW and 300 mW respectively) while maintaining the SOD-523 package footprint. These parts are active, RoHS3 compliant, and provide extended operating temperature ranges (-65°C minimum). The onsemi MM5Z3V3T1G maintains manufacturer continuity from the obsolete MM5Z3V3.

Alternative Package Options (Higher Power Rating, Different Package):

BZX84J-B3V3,115 and BZX84J-C3V3,115 (Nexperia USA Inc.) provide 550 mW power dissipation in the SOD-323F package. These parts are automotive-qualified (AEC-Q101) and suitable for applications requiring higher thermal performance. PCB layout modification is required due to package change from SOD-523F to SOD-323F.

Compliance & Availability:

All recommended substitutes are RoHS3 compliant and REACH unaffected. Parts from Nexperia USA Inc. carry automotive qualification (AEC-Q100 or AEC-Q101), suitable for automotive and industrial applications. Inventory levels are substantial across all substitute options, ensuring supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can MM5Z3V3T1G directly replace MM5Z3V3 without PCB modification?

A: Yes. MM5Z3V3T1G uses the same SOD-523 package and maintains identical footprint compatibility. The higher power rating (500 mW vs. 200 mW) provides design margin without requiring layout changes. Electrical parameters (3.3 V nominal, 95 Ω impedance, 5 µA reverse leakage) are identical.

Q: What is the difference between BZX585-B3V3,115 and BZX585-B3V3,135?

A: Both parts are electrically identical (3.3 V, 300 mW, ±2% tolerance, SOD-523 package). The difference is packaging format: BZX585-B3V3,115 is supplied in Tape & Reel (TR), while BZX585-B3V3,135 is supplied in Cut Tape (CT) & Digi-Reel®. Selection depends on procurement and assembly requirements.

Q: Can BZX84J-B3V3,115 replace MM5Z3V3 in the same PCB location?

A: No. BZX84J-B3V3,115 uses SOD-323F package (SC-90) instead of SOD-523F (SC-79). Physical dimensions differ, requiring PCB layout modification. However, electrical specifications are compatible (3.3 V nominal, 95 Ω impedance, 5 µA reverse leakage). This substitution is suitable for new designs or redesigned boards.

Q: What is the operating temperature advantage of substitute parts?

A: MM5Z3V3 operates from -55°C to 150°C. Most substitute parts (MM5Z3V3T1G, BZX585 series, BZX84J series) extend the minimum temperature to -65°C, providing 10°C additional margin for cold environment applications.

Q: Are the substitute parts automotive-qualified?

A: BZX585-B3V3,115, BZX585-B3V3,135, BZX84J-B3V3,115, and BZX84J-C3V3,115 carry automotive qualification (AEC-Q100 or AEC-Q101). MM5Z3V3T1G and BZX584C3V3_R1_00001 do not list automotive qualification. Selection depends on application requirements.

Q: What tolerance differences exist among substitute parts?

A: MM5Z3V3 specifies ±6% tolerance. Substitutes range from ±2% (BZX585 and BZX84J series) to ±6.1% (MM5Z3V3T1G). Tighter tolerance (±2%) provides better voltage regulation accuracy. Design circuits must accommodate the specified tolerance range of the selected substitute.

Q: Is PZU3.3B,115 a suitable replacement?

A: PZU3.3B,115 matches the 3.3 V nominal voltage and SOD-323F package but lacks complete parameter documentation in the provided data. Impedance and reverse leakage specifications are not provided. This part is suitable only if design requirements can be verified against the manufacturer's complete datasheet.

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