MM3Z4V3ST1 Equivalent & Substitute Parts

Part Overview

The MM3Z4V3ST1 is a Zener diode rated at 4.3 V nominal with 200 mW maximum power dissipation in a surface mount SOD-323 package. Manufactured by onsemi, this component is classified as obsolete product status. Due to its obsolete designation, locating direct inventory of the MM3Z4V3ST1 becomes increasingly difficult for new designs and production requirements. Equivalent and substitute parts with active product status provide viable alternatives that maintain electrical and mechanical compatibility while ensuring continued supply chain availability.

Substiute Parts

MM3Z4V3ST1

onsemiIn Stock: 17461MM3Z4V3ST1 Datasheet

Current PartRFQ

MM3Z4V3ST1G

onsemiIn Stock: 80196MM3Z4V3ST1G Datasheet

DirectRFQ

BZX384-C4V3,115

Nexperia USA Inc.In Stock: 37964BZX384-C4V3,115 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MM3Z4V3ST1 is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Zener voltage (Vz) must equal 4.3 V nominal
• Operating temperature range must encompass -65°C to 150°C
• Impedance (Zzt) maximum of 90 Ohms
• Reverse leakage current of 3 µA @ 1 V
• Package and mounting type must be SOD-323 surface mount

Allowable Variations:

• Power dissipation rating may exceed 200 mW (higher ratings are acceptable for the same voltage class)
• Zener voltage tolerance may differ (±3% or ±5%) provided the nominal voltage remains 4.3 V
• Forward voltage characteristics may vary within the specified operating conditions
• RoHS compliance status may differ between original and substitute parts

Substitute parts are classified as direct equivalents when all electrical parameters match or exceed the original specification, and as similar alternatives when minor parameter deviations occur within acceptable engineering tolerances for the application.

Parameter Comparison

Engineering Selection Recommendations

MM3Z4V3ST1G (onsemi) - Direct Equivalent:

The MM3Z4V3ST1G is the primary substitute for the obsolete MM3Z4V3ST1. Both components share identical electrical specifications including 4.3 V nominal zener voltage, ±3% tolerance, 90 Ohms maximum impedance, and matching forward voltage characteristics. The MM3Z4V3ST1G provides 300 mW power dissipation, which exceeds the original 200 mW rating and offers enhanced thermal margin. The MM3Z4V3ST1G maintains active product status with ROHS3 compliance, ensuring long-term supply chain availability. This part is the preferred selection for direct replacement applications.

BZX384-C4V3,115 (Nexperia USA Inc.) - Similar Alternative:

The BZX384-C4V3,115 provides functional equivalence with the same 4.3 V nominal zener voltage, 90 Ohms impedance, and 300 mW power rating. This Nexperia component operates across the identical temperature range and maintains SOD-323 package compatibility. The BZX384-C4V3,115 differs in zener voltage tolerance (±5% versus ±3%) and forward voltage specification (1.1 V @ 100 mA versus 900 mV @ 10 mA). The component holds active product status with ROHS3 compliance. Selection of this part is appropriate when supply constraints on the onsemi equivalent exist or when the ±5% tolerance specification is acceptable for the application.

Frequently Asked Questions (FAQ)

Q: Can the MM3Z4V3ST1G directly replace the MM3Z4V3ST1 in existing designs?

A: Yes. The MM3Z4V3ST1G is a direct equivalent with identical electrical parameters and SOD-323 package configuration. The increased power rating (300 mW versus 200 mW) provides additional thermal capability without affecting circuit operation.

Q: What is the primary difference between MM3Z4V3ST1G and BZX384-C4V3,115?

A: Both parts maintain 4.3 V nominal zener voltage and SOD-323 packaging. The MM3Z4V3ST1G offers ±3% tolerance matching the original specification, while the BZX384-C4V3,115 specifies ±5% tolerance. Forward voltage characteristics differ between the two parts due to different measurement conditions.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both MM3Z4V3ST1G and BZX384-C4V3,115 are ROHS3 compliant, whereas the original MM3Z4V3ST1 is RoHS non-compliant. This compliance improvement supports modern manufacturing and environmental requirements.

Q: Does the higher power rating of substitute parts affect circuit design?

A: No. The 300 mW rating of substitute parts is a superset of the original 200 mW specification. Circuits designed for 200 mW operation function identically with higher-rated components. The increased power capability provides additional design margin.

Q: Are the operating temperature ranges identical across all three parts?

A: Yes. All three parts operate across -65°C to 150°C, ensuring thermal compatibility in equivalent applications.

Q: What is the significance of the SOD-323 package designation?

A: SOD-323 is the physical package standard for all three parts. This ensures mechanical and electrical compatibility on printed circuit boards without requiring layout modifications or requalification.

Q: Can the BZX384-C4V3,115 be used in applications requiring ±3% tolerance?

A: The BZX384-C4V3,115 specifies ±5% tolerance. Applications with strict ±3% tolerance requirements should use the MM3Z4V3ST1G to ensure specification compliance.