MM3Z16VST1 Equivalent & Substitute Parts

Part Overview

The MM3Z16VST1 is a Zener diode rated at 16.18 V nominal 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 requirements and production continuity. Active alternatives with identical or superior electrical characteristics are available from the same and alternative manufacturers.

Substiute Parts

MM3Z16VST1

onsemiIn Stock: 881MM3Z16VST1 Datasheet

Current PartRFQ

MM3Z16VST1G

onsemiIn Stock: 125514MM3Z16VST1G Datasheet

DirectRFQ

PZU16B2A,115

Nexperia USA Inc.In Stock: 3930PZU16B2A,115 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MM3Z16VST1 is determined by the following critical parameters:

Electrical Compatibility Criteria:

• Zener voltage (Vz) within ±2% tolerance band
• Maximum power dissipation equal to or greater than 200 mW
• Impedance (Zzt) at or below 40 Ohms maximum
• Reverse leakage current at specified voltage
• Forward voltage characteristics
• Operating temperature range encompassing -65°C to 150°C

Mechanical Compatibility Criteria:

• Surface mount package type (SOD-323)
• SC-76 case designation

Regulatory Compliance:

• RoHS and REACH compliance status
• ECCN and HTSUS classifications

The MM3Z16VST1G qualifies as a direct equivalent with superior power rating (300 mW vs. 200 mW) and active product status. The PZU16B2A,115 qualifies as a functional substitute with comparable zener voltage (16 V vs. 16.18 V within tolerance), higher power rating (320 mW), and improved impedance characteristics (20 Ohms vs. 40 Ohms).

Parameter Comparison

Engineering Selection Recommendations

MM3Z16VST1G (onsemi) is the primary substitute for MM3Z16VST1. This part maintains identical zener voltage (16.18 V) and impedance characteristics (40 Ohms maximum) while providing increased power dissipation capability (300 mW vs. 200 mW). The MM3Z16VST1G carries active product status and ROHS3 compliance, eliminating obsolescence and regulatory concerns associated with the original part. Identical operating temperature range (-65°C to 150°C) and forward voltage characteristics ensure direct functional compatibility.

PZU16B2A,115 (Nexperia USA Inc.) serves as an alternative substitute when MM3Z16VST1G availability is constrained. This part operates at 16 V nominal zener voltage, which falls within the ±2% tolerance band of the 16.18 V specification. The PZU16B2A,115 offers superior impedance performance (20 Ohms vs. 40 Ohms maximum) and higher power rating (320 mW). The operating temperature range extends to -55°C minimum, which covers the majority of applications requiring the original -65°C specification. ROHS3 compliance and active product status support long-term supply continuity.

Selection between MM3Z16VST1G and PZU16B2A,115 depends on application-specific requirements for minimum operating temperature and impedance tolerance. Both parts are RoHS3 compliant and actively manufactured.

Frequently Asked Questions (FAQ)

Q: Can MM3Z16VST1G directly replace MM3Z16VST1 in all applications?

A: Yes. The MM3Z16VST1G maintains identical zener voltage (16.18 V), tolerance (±2%), impedance (40 Ohms maximum), and operating temperature range (-65°C to 150°C). The increased power rating (300 mW vs. 200 mW) provides additional design margin without affecting circuit operation. Both parts use the SOD-323 package and surface mount configuration.

Q: What is the voltage difference between MM3Z16VST1 and PZU16B2A,115?

A: The MM3Z16VST1 specifies 16.18 V nominal zener voltage, while the PZU16B2A,115 specifies 16 V nominal. Both parts carry ±2% tolerance, resulting in overlapping operating ranges. The 0.18 V difference represents 1.1% of the nominal 16.18 V specification and falls within the tolerance band of the original part.

Q: Are there temperature range limitations with PZU16B2A,115?

A: The PZU16B2A,115 operates from -55°C to 150°C, compared to the MM3Z16VST1 range of -65°C to 150°C. Applications requiring operation below -55°C must use MM3Z16VST1G. Applications with minimum operating temperatures at or above -55°C can use either substitute without thermal limitation.

Q: What is the impedance difference between the substitutes?

A: The MM3Z16VST1 and MM3Z16VST1G both specify 40 Ohms maximum impedance. The PZU16B2A,115 specifies 20 Ohms maximum impedance, representing superior impedance performance. Lower impedance reduces voltage variation under load current changes and improves regulation characteristics.

Q: Are both substitutes RoHS compliant?

A: Yes. Both MM3Z16VST1G and PZU16B2A,115 carry ROHS3 compliance certification. The original MM3Z16VST1 is RoHS non-compliant. Designs requiring RoHS compliance must transition to either substitute part.

Q: What is the package compatibility between these parts?

A: All three parts (MM3Z16VST1, MM3Z16VST1G, and PZU16B2A,115) use the SOD-323 surface mount package with SC-76 case designation. PCB footprints and reflow profiles are identical across all three parts.

Q: Which substitute should be selected for new designs?

A: MM3Z16VST1G is the recommended selection for new designs requiring the original MM3Z16VST1 specifications. This part provides identical electrical characteristics, active product status, and RoHS3 compliance. PZU16B2A,115 serves as an alternative when MM3Z16VST1G supply is unavailable, provided the -55°C minimum temperature limit is acceptable for the application.