MM5Z12VT1 Equivalent & Substitute Parts

Part Overview

The MM5Z12VT1 is a Zener diode rated at 12 V nominal with 100 mW maximum power dissipation in a surface mount SOD-523 package. Manufactured by onsemi, this component is classified as obsolete product status. Due to its obsolete designation, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute parts maintain the core electrical characteristics—12 V Zener voltage, SOD-523 package compatibility, and surface mount technology—while offering improved availability and compliance status.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	12	V
Power - Max	100	mW
Tolerance	±5%	—
Impedance (Max)	25	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 8 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature	-65°C ~ 150°C	—
Mounting Type	Surface Mount	—
Package / Case	SC-79, SOD-523	—

Substitute Part Grouping Explanation

Substitution of the MM5Z12VT1 is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): Must equal 12 V
Package / Case: Must be SOD-523 or mechanically compatible variant
Mounting Type: Must be Surface Mount
Operating Temperature Range: Must encompass or match -65°C ~ 150°C

Secondary Compatibility Factors:

Power - Max: Substitute parts may exceed the 100 mW rating; higher power ratings provide design margin
Tolerance: Substitute parts with tighter tolerance (±2%) are acceptable; looser tolerance (±5.4%) is acceptable
Impedance (Max): Substitute parts with lower impedance (10 Ohms) provide improved performance characteristics
Current - Reverse Leakage: Substitute parts with equal or lower leakage current are acceptable

Substitute parts are grouped into two categories: direct replacements from onsemi (MM5Z12VT1G) and cross-manufacturer equivalents from Diodes Incorporated, Nexperia USA Inc., Comchip Technology, and Rohm Semiconductor. All substitute parts maintain the 12 V Zener voltage and SOD-523 package footprint, ensuring mechanical and electrical compatibility.

Parameter Comparison

Part Number	Manufacturer	Voltage - Zener (Nom)	Power - Max	Tolerance	Impedance (Max)	Current - Reverse Leakage @ Vr	Voltage - Forward (Vf) (Max) @ If	Operating Temperature	Package / Case	Product Status	RoHS Status
MM5Z12VT1	onsemi	12 V	100 mW	±5%	25 Ohms	100 nA @ 8 V	900 mV @ 10 mA	-65°C ~ 150°C	SC-79, SOD-523	Obsolete	RoHS non-compliant
MM5Z12VT1G	onsemi	12 V	500 mW	±5.4%	25 Ohms	100 nA @ 8 V	900 mV @ 10 mA	-65°C ~ 150°C	SC-79, SOD-523	Active	ROHS3 Compliant
BZT52C12T-7	Diodes Incorporated	12 V	300 mW	±5%	25 Ohms	100 nA @ 8 V	900 mV @ 10 mA	-65°C ~ 150°C	SC-79, SOD-523	Active	ROHS3 Compliant
BZT585B12T-7	Diodes Incorporated	12 V	350 mW	±2%	10 Ohms	100 nA @ 8 V	1.1 V @ 100 mA	-65°C ~ 150°C	SC-79, SOD-523	Active	ROHS3 Compliant
BZX585-B12,115	Nexperia USA Inc.	12 V	300 mW	±2%	10 Ohms	100 nA @ 8 V	1.1 V @ 100 mA	-65°C ~ 150°C	SC-79, SOD-523	Active	ROHS3 Compliant
BZX585-B12,135	Nexperia USA Inc.	12 V	300 mW	±2%	10 Ohms	100 nA @ 8 V	1.1 V @ 100 mA	-65°C ~ 150°C	SC-79, SOD-523	Active	ROHS3 Compliant
BZX585-C12,115	Nexperia USA Inc.	12 V	300 mW	±5%	10 Ohms	100 µA @ 8 V	1.1 V @ 100 mA	-65°C ~ 150°C	SC-79, SOD-523	Active	ROHS3 Compliant
BZX585-C12,135	Nexperia USA Inc.	12 V	300 mW	±5%	10 Ohms	100 µA @ 8 V	1.1 V @ 100 mA	-65°C ~ 150°C	SC-79, SOD-523	Active	ROHS3 Compliant
BZX84J-B12,115	Nexperia USA Inc.	12 V	550 mW	±2%	10 Ohms	100 nA @ 8 V	1.1 V @ 100 mA	-65°C ~ 150°C	SC-90, SOD-323F	Active	ROHS3 Compliant
CZRU52C12	Comchip Technology	12 V	150 mW	±5%	20 Ohms	100 nA @ 9 V	900 mV @ 10 mA	-55°C ~ 125°C	2-SMD, No Lead	Active	ROHS3 Compliant
EDZVFHT2R12B	Rohm Semiconductor	12 V	150 mW	±2%	30 Ohms	100 nA @ 9 V	—	-55°C ~ 150°C	SC-79, SOD-523	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: MM5Z12VT1G

The MM5Z12VT1G is the direct successor from onsemi. It maintains identical electrical characteristics to the MM5Z12VT1 while offering active product status and ROHS3 compliance. The increased power rating (500 mW versus 100 mW) provides additional design margin without affecting circuit performance. This part is the preferred choice for direct replacement in existing designs.

Secondary Recommendations for SOD-523 Package:

BZT52C12T-7 (Diodes Incorporated) provides a 300 mW rated alternative with matching tolerance (±5%) and identical forward voltage characteristics. This part maintains full compatibility with the original MM5Z12VT1 footprint and electrical specifications.

BZT585B12T-7 (Diodes Incorporated) offers improved performance with tighter tolerance (±2%), lower impedance (10 Ohms), and 350 mW power rating. This part is suitable for applications requiring enhanced voltage regulation stability.

BZX585-B12,115 and BZX585-B12,135 (Nexperia USA Inc.) are automotive-qualified alternatives (AEC-Q100) with ±2% tolerance and 300 mW power rating. These parts are appropriate for automotive and high-reliability applications.

BZX585-C12,115 and BZX585-C12,135 (Nexperia USA Inc.) provide automotive qualification with ±5% tolerance matching the original part specification. These variants are suitable for cost-sensitive automotive applications.

Alternative Package Consideration:

BZX84J-B12,115 (Nexperia USA Inc.) uses SOD-323F package instead of SOD-523. This part is not a direct footprint replacement but offers higher power dissipation (550 mW) and automotive qualification (AEC-Q101) for applications where package size can be accommodated.

Lower Power Alternatives:

CZRU52C12 (Comchip Technology) and EDZVFHT2R12B (Rohm Semiconductor) are rated at 150 mW and are suitable only for applications where the original 100 mW specification is sufficient. These parts have reduced operating temperature ranges compared to the original part.

All recommended substitute parts are ROHS3 compliant and REACH unaffected, meeting modern regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can MM5Z12VT1G be used as a direct replacement for MM5Z12VT1?

A: Yes. MM5Z12VT1G is the active equivalent from onsemi. It maintains the same 12 V Zener voltage, SOD-523 package, and operating temperature range. The increased power rating (500 mW) does not affect circuit operation and provides additional design margin.

Q: What is the difference between ±5% and ±2% tolerance variants?

A: Tolerance specifies the allowable deviation from the nominal 12 V Zener voltage. ±5% tolerance allows deviation from 11.4 V to 12.6 V, while ±2% tolerance allows deviation from 11.76 V to 12.24 V. Applications requiring tighter voltage regulation should use ±2% variants such as BZT585B12T-7 or BZX585-B12,115.

Q: Are automotive-qualified parts (AEC-Q100, AEC-Q101) necessary for non-automotive applications?

A: Automotive qualification is not required for non-automotive applications. However, automotive-qualified parts meet stringent reliability and quality standards that benefit any application. BZX585-B12,115, BZX585-B12,135, BZX585-C12,115, BZX585-C12,135, and BZX84J-B12,115 carry automotive qualification and are suitable for general industrial use.

Q: Why does BZX84J-B12,115 use a different package (SOD-323F)?

A: BZX84J-B12,115 uses SOD-323F package, which is physically larger than SOD-523. This package change is not a direct footprint replacement and requires PCB layout modification. This part is recommended only when higher power dissipation (550 mW) is required and package size constraints can be accommodated.

Q: Can CZRU52C12 or EDZVFHT2R12B be used as replacements?

A: CZRU52C12 and EDZVFHT2R12B are rated at 150 mW, which exceeds the original 100 mW specification. These parts are suitable only for applications where the original 100 mW power rating is sufficient. Both parts have reduced operating temperature ranges: CZRU52C12 operates from -55°C to 125°C, and EDZVFHT2R12B operates from -55°C to 150°C. Applications requiring the full -65°C to 150°C range should use higher-rated alternatives.

Q: What is the significance of impedance (Zzt) differences?

A: Impedance affects voltage regulation quality. Lower impedance (10 Ohms in BZT585B12T-7, BZX585-B12,115, BZX585-B12,135, BZX585-C12,115, BZX585-C12,135, and BZX84J-B12,115) provides better voltage stability and faster transient response compared to higher impedance (25 Ohms in MM5Z12VT1 and MM5Z12VT1G, 20 Ohms in CZRU52C12, 30 Ohms in EDZVFHT2R12B). Applications requiring superior voltage regulation should prioritize lower impedance variants.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are ROHS3 compliant. The original MM5Z12VT1 is RoHS non-compliant. Modern designs should use ROHS3 compliant alternatives to meet regulatory requirements.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape packaging is supplied in individual strips suitable for small-quantity orders and manual assembly. Tape & Reel packaging is supplied on continuous reels suitable for high-volume automated assembly. Both packaging formats contain identical components; the difference is in supply format and handling method.

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