MM5Z4V7 Equivalent & Substitute Parts

Part Overview

The MM5Z4V7 is a Zener diode manufactured by onsemi, rated at 4.7 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 may be limited or unavailable. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for applications utilizing this Zener diode specification.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	4.7	V
Power - Max	200	mW
Tolerance	±6%	—
Impedance (Max)	80	Ohms
Current - Reverse Leakage @ Vr	3	µA @ 2 V
Operating Temperature Range	-55°C to 150°C	—
Mounting Type	Surface Mount	—
Package / Case	SC-79, SOD-523F	—

Substitute Part Grouping Explanation

Substitution of the MM5Z4V7 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Zener voltage must be 4.7 V nominal
Maximum power dissipation must be equal to or greater than 200 mW
Impedance (Zzt) must be 80 Ohms or lower
Reverse leakage current must be 3 µA @ 2 V or lower
Tolerance must be ±6% or tighter
Operating temperature range must encompass -55°C to 150°C

Mechanical Compatibility Requirements:

Surface mount mounting type
Package must be SOD-523 or SOD-523F (SC-79) or compatible footprint alternatives

Substitute parts are grouped into two categories:

Direct Substitutes: Parts meeting all electrical parameters with identical or superior power ratings and matching SOD-523/SOD-523F packaging.

Similar Substitutes: Parts meeting core electrical parameters (4.7 V, 3 µA leakage, 80 Ohms impedance) with alternative package formats (SOD-323F) or enhanced specifications that maintain functional compatibility within the application circuit.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Power Max	Tolerance	Zzt (Max)	Ir @ Vr	Temp Range	Package	Status
MM5Z4V7	onsemi	4.7 V	200 mW	±6%	80 Ω	3 µA @ 2 V	-55°C to 150°C	SOD-523F	Obsolete
MM5Z4V7T1G	onsemi	4.7 V	500 mW	±6.4%	80 Ω	3 µA @ 2 V	-65°C to 150°C	SOD-523	Active
BZT52C4V7T-TP	Micro Commercial Co	4.7 V	100 mW	±5%	80 Ω	3 µA @ 2 V	-65°C to 150°C	SOD-523	Active
BZT52H-C4V7,115	NXP Semiconductors	4.7 V	375 mW	±5%	78 Ω	3 µA @ 2 V	-65°C to 150°C	SOD-123F	Active
BZX584C4V7_R1_00001	Panjit International Inc.	4.7 V	200 mW	±5%	80 Ω	3 µA @ 2 V	-55°C to 150°C	SOD-523	Active
BZX585-B4V7,115	Nexperia USA Inc.	4.7 V	300 mW	±2%	80 Ω	3 µA @ 2 V	-65°C to 150°C	SOD-523	Active
BZX585-B4V7,135	Nexperia USA Inc.	4.7 V	300 mW	±2%	80 Ω	3 µA @ 2 V	-65°C to 150°C	SOD-523	Active
BZX84J-C4V7,115	Nexperia USA Inc.	4.7 V	550 mW	±5%	80 Ω	3 µA @ 2 V	-65°C to 150°C	SOD-323F	Active

Engineering Selection Recommendations

Primary Direct Substitute: MM5Z4V7T1G (onsemi) is the recommended primary substitute. This part is manufactured by the same original equipment manufacturer, maintains the 4.7 V nominal specification, and provides enhanced power dissipation (500 mW versus 200 mW). The part is active in production status with RoHS3 compliance and extended operating temperature range (-65°C to 150°C). The SOD-523 package is mechanically compatible with SOD-523F footprints.

Secondary Direct Substitute: BZX584C4V7_R1_00001 (Panjit International Inc.) provides equivalent electrical performance with 200 mW power rating, matching the original MM5Z4V7 specification. This part is active in production, RoHS3 compliant, and maintains the identical operating temperature range (-55°C to 150°C). The SOD-523 package is footprint compatible.

Automotive-Grade Alternatives: BZX585-B4V7,115 and BZX585-B4V7,135 (Nexperia USA Inc.) are automotive-qualified parts (AEC-Q100) with 300 mW power rating and superior tolerance (±2%). These parts are suitable for applications requiring automotive-grade components and extended temperature range (-65°C to 150°C).

Higher Power Alternative: BZX84J-C4V7,115 (Nexperia USA Inc.) offers 550 mW power dissipation with automotive qualification (AEC-Q101). The SOD-323F package is larger than SOD-523F and requires PCB layout modification but provides significant thermal margin for high-current applications.

Lower Power Alternative: BZT52C4V7T-TP (Micro Commercial Co) is suitable only for applications where 100 mW power dissipation is sufficient. This part should not be used as a direct replacement for the 200 mW MM5Z4V7 in circuits requiring the full 200 mW specification.

Frequently Asked Questions (FAQ)

Q: Can MM5Z4V7T1G directly replace MM5Z4V7 without circuit modification?

A: Yes. MM5Z4V7T1G is a direct functional replacement. Both parts share the 4.7 V nominal Zener voltage, 80 Ohms impedance, and 3 µA reverse leakage specification. The MM5Z4V7T1G provides higher power dissipation (500 mW), which is compatible with circuits designed for 200 mW. The SOD-523 package footprint is compatible with SOD-523F PCB layouts.

Q: What is the difference between BZX585-B4V7,115 and BZX585-B4V7,135?

A: Both parts are electrically identical with 4.7 V nominal voltage, 300 mW power rating, ±2% tolerance, and AEC-Q100 automotive qualification. The numerical suffix (115 versus 135) indicates different packaging or tape reel configurations from Nexperia. Both are functionally equivalent for circuit applications.

Q: Is BZT52C4V7T-TP suitable as a replacement for MM5Z4V7?

A: BZT52C4V7T-TP is not recommended as a direct replacement. While it meets the 4.7 V and electrical parameter requirements, its 100 mW power rating is insufficient for applications requiring the full 200 mW specification of the MM5Z4V7. Use this part only in circuits where power dissipation does not exceed 100 mW.

Q: Why does BZX84J-C4V7,115 use a different package (SOD-323F) instead of SOD-523?

A: BZX84J-C4V7,115 uses the larger SOD-323F package to accommodate its higher power dissipation rating (550 mW). The larger package provides improved thermal characteristics. PCB layout modification is required to accommodate the different footprint, but electrical performance is fully compatible with MM5Z4V7 applications.

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts listed are RoHS3 compliant. The original MM5Z4V7 is obsolete and does not carry RoHS certification. All recommended substitutes meet current RoHS3 requirements.

Q: What is the operating temperature difference between MM5Z4V7 and its substitutes?

A: The original MM5Z4V7 operates from -55°C to 150°C. Most active substitutes extend the lower temperature limit to -65°C, providing broader environmental compatibility. This extended range does not negatively impact applications designed for the original -55°C to 150°C specification.

Q: Can BZT52H-C4V7,115 replace MM5Z4V7 in existing PCB designs?

A: BZT52H-C4V7,115 is electrically compatible but uses SOD-123F package instead of SOD-523F. PCB layout modification is required. The part is automotive-qualified (AEC-Q101) with 375 mW power rating and ±5% tolerance, making it suitable for applications requiring automotive-grade components.

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