MM5Z15VT1 Zener Diode Equivalent & Substitute Parts

Part Overview

The MM5Z15VT1 is a 15 V Zener diode rated for 100 mW power dissipation in a surface mount SOD-523 package. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design requirements and production continuity. Active alternatives with identical or enhanced electrical characteristics are available from multiple manufacturers, providing direct functional replacement options.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	15	V
Tolerance	±5%	—
Power - Max	100	mW
Impedance (Max)	30	Ohms
Current - Reverse Leakage @ Vr	50	nA @ 10.5 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature Range	-65 to 150	°C
Package / Case	SOD-523	—
Mounting Type	Surface Mount	—
RoHS Status	Non-compliant	—

Substitute Part Grouping Explanation

Substitution of the MM5Z15VT1 is determined by the following critical parameters: nominal Zener voltage (15 V), voltage tolerance (±5%), package type (SOD-523), mounting configuration (surface mount), and operating temperature range (-65°C to 150°C). The maximum power rating of 100 mW establishes a minimum threshold; substitute parts with equal or higher power ratings are functionally compatible. Impedance, reverse leakage current, and forward voltage characteristics must remain within specified limits to ensure circuit performance equivalence.

Substitute parts are grouped into two categories:

Direct Equivalents (Same Package - SOD-523): Parts maintaining the SOD-523 package form factor with 15 V nominal Zener voltage and compatible electrical characteristics.

Alternative Package Options (Different Package): Parts with identical electrical specifications but different surface mount packages, suitable for applications where package footprint flexibility exists.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Package	Product Status	RoHS Status
MM5Z15VT1	onsemi	15 V	±5%	100 mW	30 Ω	SOD-523	Obsolete	Non-compliant
MM5Z15VT1G	onsemi	15 V	±5%	500 mW	30 Ω	SOD-523	Active	ROHS3 Compliant
BZX585-B15,115	Nexperia USA Inc.	15 V	±2%	300 mW	15 Ω	SOD-523	Active	ROHS3 Compliant
BZX585-B15,135	Nexperia USA Inc.	15 V	±2%	300 mW	15 Ω	SOD-523	Active	ROHS3 Compliant
BZX585-C15,115	Nexperia USA Inc.	15 V	±5%	300 mW	15 Ω	SOD-523	Active	ROHS3 Compliant
BZX585-C15,135	Nexperia USA Inc.	15 V	±5%	300 mW	15 Ω	SOD-523	Active	ROHS3 Compliant
BZX84J-B15,115	Nexperia USA Inc.	15 V	±2%	550 mW	15 Ω	SOD-323F	Active	ROHS3 Compliant
CZRU52C15	Comchip Technology	15 V	±5%	150 mW	30 Ω	0603/SOD-523F	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - MM5Z15VT1G (onsemi): This part is the direct successor to the MM5Z15VT1, maintaining identical electrical specifications and SOD-523 package compatibility. The MM5Z15VT1G offers enhanced power rating (500 mW versus 100 mW), ROHS3 compliance, and active product status. This part is suitable for direct board-level substitution without design modification.

Secondary Recommendation - BZX585-C15,115 or BZX585-C15,135 (Nexperia USA Inc.): These parts maintain the ±5% tolerance specification matching the original MM5Z15VT1 and provide SOD-523 package compatibility. The 300 mW power rating exceeds the original 100 mW specification. Both parts carry ROHS3 compliance, AEC-Q100 automotive qualification, and active product status. The BZX585-C15,115 variant is available in Cut Tape & Digi-Reel packaging.

Alternative for Automotive Applications - BZX585-B15,115 or BZX585-B15,135 (Nexperia USA Inc.): These parts provide tighter voltage tolerance (±2% versus ±5%), lower impedance (15 Ω versus 30 Ω), and AEC-Q100 automotive qualification. SOD-523 package compatibility is maintained. These parts are suitable for applications requiring enhanced voltage regulation precision.

Package Alternative - BZX84J-B15,115 (Nexperia USA Inc.): This part provides identical 15 V Zener voltage with enhanced power rating (550 mW) and tighter tolerance (±2%). The SOD-323F package differs from the original SOD-523, requiring PCB layout modification. This option is suitable for applications where increased power dissipation capacity is required and package footprint change is acceptable.

Limited Power Application - CZRU52C15 (Comchip Technology): This part maintains 15 V Zener voltage and ±5% tolerance with 150 mW power rating. The 0603/SOD-523F package provides compatibility with standard 0603 footprints. Operating temperature range is reduced (-55°C to 125°C). This option is suitable for applications with lower power requirements and standard 0603 package availability.

Frequently Asked Questions (FAQ)

Q: Can MM5Z15VT1G be used as a direct replacement for MM5Z15VT1?

A: Yes. The MM5Z15VT1G maintains identical nominal Zener voltage (15 V), tolerance (±5%), impedance (30 Ω), and SOD-523 package configuration. The enhanced power rating (500 mW versus 100 mW) provides additional design margin without affecting circuit functionality. No design modification is required.

Q: What is the difference between BZX585-B15 and BZX585-C15 variants?

A: The primary difference is voltage tolerance. BZX585-B15 variants specify ±2% tolerance, while BZX585-C15 variants specify ±5% tolerance. Both maintain 15 V nominal Zener voltage, 300 mW power rating, and SOD-523 package compatibility. Selection depends on circuit voltage regulation precision requirements.

Q: Are the packaging variants (115 and 135) electrically equivalent?

A: Yes. The numeric suffixes (115 and 135) designate packaging format only. BZX585-B15,115 and BZX585-B15,135 are electrically identical; the difference is in tape reel configuration and quantity per reel. Both are suitable for identical circuit applications.

Q: Why does BZX84J-B15,115 use a different package (SOD-323F)?

A: The BZX84J series uses the SOD-323F package, which is physically smaller than SOD-523. This package change allows higher power dissipation (550 mW) in a compact form factor. PCB layout modification is required for this substitution.

Q: Is CZRU52C15 suitable for all MM5Z15VT1 applications?

A: CZRU52C15 maintains 15 V Zener voltage and ±5% tolerance but has reduced power rating (150 mW versus 100 mW original specification) and narrower operating temperature range (-55°C to 125°C versus -65°C to 150°C). This part is suitable only for applications within these reduced specifications.

Q: What does RoHS3 compliance mean for component selection?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. All active substitute parts listed carry ROHS3 compliance, making them suitable for modern manufacturing and environmental standards. The original MM5Z15VT1 is non-compliant, making substitution necessary for RoHS-regulated applications.

Q: Can I use a higher power-rated Zener diode as a substitute?

A: Yes. A Zener diode with higher power rating (such as MM5Z15VT1G at 500 mW) can replace a lower-rated part (100 mW) provided all other electrical parameters remain within specification. Higher power rating provides additional thermal margin and does not degrade circuit performance.

Q: What is the significance of AEC-Q100 qualification?

A: AEC-Q100 qualification indicates the part meets automotive industry reliability standards. Parts carrying this qualification (BZX585 series) are suitable for automotive and high-reliability applications. This certification is not present on the original MM5Z15VT1 or MM5Z15VT1G.

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