MM3Z15VT1 Equivalent & Substitute Parts

Part Overview

The MM3Z15VT1 is a Zener diode rated at 15 V nominal voltage with 200 mW maximum power dissipation in a surface mount SOD-323 package. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design support and procurement continuity. Active alternatives with identical or enhanced electrical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	15 V
Power - Max	200 mW
Tolerance	±5%
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°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	SC-76, SOD-323

Substitute Part Grouping Explanation

Substitution of the MM3Z15VT1 is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 15 V nominal
Maximum power dissipation: 200 mW or greater
Voltage tolerance: ±5% or tighter
Impedance (Max): 30 Ohms or less
Operating temperature range: -65°C to 150°C or equivalent coverage
Package compatibility: SOD-323 or equivalent footprint

Substitution Categories:

Direct Equivalent (Identical Specifications): MM3Z15VT1G from onsemi provides identical electrical performance with enhanced power rating (300 mW) and active product status.

Functional Equivalent (Same Voltage, Matching Power Rating): BZT52C15S-TP from Micro Commercial Co matches the 200 mW power specification with SOD-323 packaging and active status.

Functional Equivalent (Same Voltage, Different Package): CZRF52C15 from Comchip Technology provides 15 V Zener voltage with 200 mW rating in 1005/SOD-323F package format.

Parameter Comparison

Parameter	MM3Z15VT1	MM3Z15VT1G	BZT52C15S-TP	CZRF52C15
Manufacturer	onsemi	onsemi	Micro Commercial Co	Comchip Technology
Product Status	Obsolete	Active	Active	Active
Voltage - Zener (Nom)	15 V	15 V	15 V	15 V
Tolerance	±5%	±5%	±6%	±5%
Power - Max	200 mW	300 mW	200 mW	200 mW
Impedance (Max)	30 Ohms	30 Ohms	30 Ohms	30 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 10.5 V	50 nA @ 10.5 V	100 nA @ 10.5 V	100 nA @ 11 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 125°C
Package / Case	SC-76, SOD-323	SC-76, SOD-323	SC-76, SOD-323	1005 (2512 Metric)
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: MM3Z15VT1G

The MM3Z15VT1G from onsemi is the preferred substitute. It maintains identical electrical specifications to the MM3Z15VT1 while offering enhanced power dissipation capability (300 mW versus 200 mW). The part is in active production status, ensuring long-term availability. It carries ROHS3 compliance certification, addressing regulatory requirements that the original obsolete part does not meet. Identical package format (SOD-323) ensures direct footprint compatibility.

Secondary Recommendation: BZT52C15S-TP

The BZT52C15S-TP from Micro Commercial Co provides functional equivalence with matching 200 mW power rating and SOD-323 packaging. This part is in active production status with ROHS3 compliance. The voltage tolerance specification is ±6% compared to the original ±5%, and reverse leakage current is specified at 100 nA versus 50 nA. These differences remain within acceptable operational margins for most applications.

Alternative Recommendation: CZRF52C15

The CZRF52C15 from Comchip Technology offers 15 V Zener voltage with 200 mW power rating and ±5% tolerance matching the original specification. This part is in active production with ROHS3 compliance. The package format is 1005/SOD-323F, which differs from the original SOD-323. Operating temperature range is -55°C to 125°C, which is narrower than the original -65°C to 150°C specification. This part is suitable for applications where the reduced temperature range is acceptable and where the 1005 package footprint is compatible with the design.

Frequently Asked Questions (FAQ)

Q: Can MM3Z15VT1G be used as a direct replacement for MM3Z15VT1?

A: Yes. The MM3Z15VT1G provides identical electrical specifications with enhanced power dissipation (300 mW). The SOD-323 package is identical, enabling direct footprint substitution. The higher power rating provides additional design margin without affecting circuit operation.

Q: What is the difference between ±5% and ±6% voltage tolerance?

A: Voltage tolerance specifies the accuracy of the Zener voltage at a specified test current. ±5% tolerance provides tighter voltage regulation than ±6%. For the 15 V nominal voltage, ±5% tolerance allows ±0.75 V deviation, while ±6% allows ±0.90 V deviation. Selection depends on circuit requirements for voltage regulation precision.

Q: Why does CZRF52C15 have a different operating temperature range?

A: The CZRF52C15 is specified for -55°C to 125°C operation, which is narrower than the original -65°C to 150°C range. This reflects the manufacturer's tested and validated operating envelope for this specific device. Applications requiring operation below -55°C or above 125°C must use MM3Z15VT1G or BZT52C15S-TP.

Q: Is the 1005 package of CZRF52C15 compatible with SOD-323 designs?

A: The 1005 package (2512 Metric) has different physical dimensions than SOD-323. While both are surface mount packages, they are not footprint-compatible. PCB layout modification is required to accommodate CZRF52C15. Verify package dimensions against design specifications before selection.

Q: What does RoHS3 compliance mean for these parts?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. The original MM3Z15VT1 is RoHS non-compliant. All substitute parts listed are ROHS3 compliant, meeting current regulatory standards for electronic components in most markets.

Q: Can reverse leakage current differences affect circuit performance?

A: Reverse leakage current is specified at 50 nA for MM3Z15VT1 and MM3Z15VT1G, and 100 nA for BZT52C15S-TP and CZRF52C15. Higher leakage current increases standby power consumption and may affect precision circuits requiring very low leakage. For most standard applications, the 100 nA specification is acceptable. High-precision or ultra-low-power designs should prioritize the 50 nA specification.

Q: What inventory considerations apply to these substitutes?

A: MM3Z15VT1G has the highest inventory availability (161,300 pcs), ensuring reliable long-term supply. BZT52C15S-TP and CZRF52C15 have lower inventory levels (2,000 pcs and 4,300 pcs respectively). For high-volume production, MM3Z15VT1G is the recommended choice for supply chain stability.

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