MM3Z15VT1G Equivalent & Substitute Parts

Part Overview

The MM3Z15VT1G is a Zener diode manufactured by onsemi, rated at 15 V nominal voltage with 300 mW maximum power dissipation in a surface mount SOD-323 package. This component is classified as Active product status and is ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical characteristics including zener voltage, tolerance, power rating, and package type. Alternative components become necessary when the primary part experiences supply constraints, extended lead times, or when design requirements permit operation within the specified parameter ranges of qualified substitutes.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	15	V
Tolerance	±5%	—
Power - Max	300	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	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SC-76, SOD-323	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MM3Z15VT1G is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 15 V nominal
Tolerance: ±5% or ±6% (within acceptable deviation)
Package type: SOD-323 or equivalent surface mount form factor
Mounting type: Surface Mount
RoHS compliance: ROHS3 Compliant
Operating temperature range: Minimum -65°C to 150°C coverage

Secondary Consideration Parameters:

Power rating: 200 mW to 300 mW (substitutes with lower power ratings operate within design margins)
Impedance: 16 to 30 Ohms (affects transient response characteristics)
Reverse leakage current: 50 nA to 100 nA range (acceptable variance)
Forward voltage: 900 mV @ 10 mA (consistent across all candidates)

Substitute parts are grouped into three categories: Parametric Equivalents (identical electrical specifications with different manufacturer), Direct Substitutes (same voltage and tolerance with minor power or impedance variations), and Similar Alternatives (matching core specifications with acceptable tolerance or power derating).

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Impedance (Max)	Package	Temp Range	RoHS
MM3Z15VT1G	onsemi	15 V	±5%	300 mW	30 Ω	SOD-323	-65 to 150°C	ROHS3
SZMM3Z15VT1G	onsemi	15 V	±5%	300 mW	30 Ω	SOD-323	-65 to 150°C	ROHS3
DDZ9702S-7	Diodes Incorporated	15 V	±5%	200 mW	—	SOD-323	-65 to 150°C	ROHS3
MMSZ5245BS-7-F	Diodes Incorporated	15 V	±5%	200 mW	16 Ω	SOD-323	-65 to 150°C	ROHS3
BZT52-C15S-AU_R1_000A1	Panjit International Inc.	15 V	±5%	200 mW	30 Ω	SOD-323	-55 to 150°C	ROHS3
BZT52-C15S_R1_00001	Panjit International Inc.	15 V	±5%	200 mW	30 Ω	SOD-323	-55 to 150°C	ROHS3
BZT52C15S-7-F	Diodes Incorporated	15 V	±6%	200 mW	30 Ω	SOD-323	-65 to 150°C	ROHS3
BZT52C15S-TP	Micro Commercial Co	15 V	±6%	200 mW	30 Ω	SOD-323	-65 to 150°C	ROHS3
CMDZ15L TR PBFREE	Central Semiconductor Corp	15 V	±5%	250 mW	80 Ω	SOD-323	-65 to 150°C	ROHS3
CMDZ5245B TR PBFREE	Central Semiconductor Corp	15 V	±5%	250 mW	16 Ω	SOD-323	-65 to 150°C	ROHS3
CZRF52C15	Comchip Technology	15 V	±5%	200 mW	30 Ω	1005/SOD-323F	-55 to 125°C	ROHS3

Engineering Selection Recommendations

Parametric Equivalent (Highest Compatibility):

SZMM3Z15VT1G from onsemi is a parametric equivalent to MM3Z15VT1G with identical electrical specifications. This part carries AEC-Q101 automotive qualification, providing enhanced reliability documentation. Selection of this part introduces no design risk and maintains full specification compliance.

Direct Substitutes (Full Compatibility with Power Derating):

DDZ9702S-7, MMSZ5245BS-7-F, BZT52C15S-7-F, and BZT52C15S-TP are direct substitutes with 200 mW power ratings. These parts operate within the 15 V ±5% specification and maintain SOD-323 packaging. The 100 mW power reduction from the original 300 mW specification is acceptable in applications where thermal dissipation does not approach maximum ratings. All candidates maintain ROHS3 compliance and -65°C to 150°C operating range coverage.

Similar Alternatives (Acceptable with Parameter Variance):

BZT52-C15S-AU_R1_000A1 and BZT52-C15S_R1_00001 from Panjit International Inc. provide 15 V ±5% zener voltage with 200 mW power rating and AEC-Q101 automotive qualification. Operating temperature minimum is -55°C, which is acceptable for most commercial and automotive applications. Impedance specification of 30 Ω matches the original part.

CMDZ15L TR PBFREE and CMDZ5245B TR PBFREE from Central Semiconductor Corp offer 250 mW power rating with 15 V ±5% specification. CMDZ5245B TR PBFREE features 16 Ω impedance, providing lower dynamic impedance than the original specification. CMDZ15L TR PBFREE exhibits 80 Ω impedance, which represents higher impedance variance but remains within acceptable substitution parameters.

CZRF52C15 from Comchip Technology operates at -55°C to 125°C, providing reduced low-temperature coverage compared to the original -65°C specification. This part is suitable for applications not requiring extended low-temperature operation.

Product Status Compliance:

All substitute parts maintain Active product status and ROHS3 compliance, ensuring continued availability and regulatory conformance.

Frequently Asked Questions (FAQ)

Q: Can SZMM3Z15VT1G directly replace MM3Z15VT1G without circuit modification?

A: Yes. SZMM3Z15VT1G is a parametric equivalent with identical zener voltage (15 V ±5%), power rating (300 mW), impedance (30 Ω), and operating temperature range (-65°C to 150°C). The only difference is manufacturer designation and automotive qualification level. No circuit modification is required.

Q: What is the impact of using a 200 mW substitute instead of the 300 mW original part?

A: The 200 mW power rating reduction is acceptable when circuit design does not require continuous operation at maximum power dissipation. Verify that steady-state and transient power dissipation in the application remains below 200 mW. If application requires full 300 mW capability, select SZMM3Z15VT1G, CMDZ15L TR PBFREE, or CMDZ5245B TR PBFREE.

Q: Are all substitute parts available in SOD-323 packaging?

A: All listed substitutes are available in SOD-323 or equivalent surface mount packaging (SOD-323F). CZRF52C15 is specified as 1005/SOD-323F, which is mechanically and electrically compatible with standard SOD-323 footprints. Verify PCB footprint compatibility before selection.

Q: What is the significance of ±6% tolerance versus ±5% tolerance?

A: BZT52C15S-7-F and BZT52C15S-TP specify ±6% tolerance compared to the original ±5%. This represents a 1% wider tolerance band. For applications requiring tighter voltage regulation, select parts with ±5% tolerance. For general-purpose voltage regulation and protection circuits, ±6% tolerance is acceptable.

Q: Can I use CZRF52C15 in applications requiring -65°C operation?

A: No. CZRF52C15 operates from -55°C to 125°C, which does not cover the full -65°C to 150°C range of the original part. Use CZRF52C15 only in applications with minimum operating temperature of -55°C and maximum of 125°C.

Q: What is the difference between impedance specifications of 16 Ω, 30 Ω, and 80 Ω?

A: Impedance affects transient response and noise filtering characteristics. Lower impedance (16 Ω) provides faster transient response. Higher impedance (80 Ω) provides greater noise filtering. The original part specifies 30 Ω. Substitutes with 16 Ω or 30 Ω impedance are directly compatible. CMDZ15L TR PBFREE with 80 Ω impedance introduces slower transient response and is suitable only for applications where this characteristic is acceptable.

Q: Are automotive-qualified parts (AEC-Q101) required for my application?

A: AEC-Q101 qualification is required for automotive applications. SZMM3Z15VT1G, BZT52-C15S-AU_R1_000A1, and BZT52-C15S_R1_00001 carry AEC-Q101 qualification. For non-automotive applications, all listed parts are acceptable.

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 manual assembly or small-volume production. Tape & Reel packaging is supplied on continuous reels for automated assembly equipment. Both formats contain identical components. Selection depends on assembly process requirements, not electrical performance.

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