MM3Z43VT1 Equivalent & Substitute Parts

Part Overview

The MM3Z43VT1 is a Zener diode rated at 43 V nominal voltage 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, equivalent and substitute parts with active product status are necessary for new designs and ongoing production requirements. Substitute components maintain the core electrical specifications while offering improved availability and compliance certifications.

Substiute Parts

MM3Z43VT1

onsemiIn Stock: 893MM3Z43VT1 Datasheet

Current PartRFQ

MM3Z43VT1G

onsemiIn Stock: 7239MM3Z43VT1G Datasheet

DirectRFQ

BZX384-B43,115

Nexperia USA Inc.In Stock: 25833BZX384-B43,115 Datasheet

SimilarRFQ

BZX384-C43,115

NXP SemiconductorsIn Stock: 226467BZX384-C43,115 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MM3Z43VT1 is determined by the following critical parameters that must remain constant or compatible:

Core Electrical Requirements:

• Zener voltage: 43 V nominal
• Package type: SOD-323 surface mount
• Operating temperature range: -65°C to 150°C
• Impedance (Max): 150 Ohms

Allowable Variations:

• Power rating: Substitute parts may exceed 200 mW (higher power ratings are backward compatible)
• Tolerance: Substitute parts may have tighter tolerance specifications (±2% to ±7%)
• Reverse leakage current: Substitute parts may have lower leakage specifications
• Forward voltage: Substitute parts may have different forward voltage characteristics at different test currents

All substitute parts listed maintain the 43 V zener voltage specification and SOD-323 package format, ensuring mechanical and electrical compatibility with the original MM3Z43VT1 design.

Parameter Comparison

Engineering Selection Recommendations

MM3Z43VT1G (onsemi)

The MM3Z43VT1G is the direct manufacturer equivalent with active product status. This part maintains identical electrical specifications to the MM3Z43VT1 while offering increased power rating (300 mW versus 200 mW). The MM3Z43VT1G carries ROHS3 compliance certification and is available in Tape & Reel packaging. Selection of this part provides continuity with the original onsemi product line and is recommended for designs requiring onsemi component qualification.

BZX384-C43,115 (NXP Semiconductors)

The BZX384-C43,115 provides the highest inventory availability and represents an alternative manufacturer solution. This part maintains the 43 V zener voltage and SOD-323 package while offering improved reverse leakage characteristics (5 nA versus 50 nA). The ±5% tolerance specification falls between the original ±7% and the tighter ±2% option. ROHS3 compliance and REACH unaffected status are confirmed. This part is suitable for applications where NXP component qualification is acceptable.

BZX384-B43,115 (Nexperia USA Inc.)

The BZX384-B43,115 offers the tightest tolerance specification at ±2%, providing enhanced voltage regulation precision. This part maintains all core electrical parameters and SOD-323 packaging. ROHS3 compliance is confirmed. Selection of this part is appropriate for applications requiring superior voltage accuracy and where Nexperia component qualification is established.

All substitute parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings, meeting modern manufacturing and environmental standards.

Frequently Asked Questions (FAQ)

Q: Can MM3Z43VT1G be used as a direct replacement for MM3Z43VT1?

A: Yes. The MM3Z43VT1G maintains identical zener voltage (43 V), tolerance (±7%), impedance (150 Ohms), and operating temperature range (-65°C to 150°C). The increased power rating (300 mW versus 200 mW) is backward compatible. Both components use the SOD-323 surface mount package.

Q: What is the primary difference between the three substitute options?

A: The primary differences are manufacturer source and tolerance specification. MM3Z43VT1G maintains ±7% tolerance matching the original. BZX384-C43,115 offers ±5% tolerance with lower reverse leakage (5 nA). BZX384-B43,115 provides the tightest tolerance at ±2%. All three maintain 43 V zener voltage and SOD-323 packaging.

Q: Are there package compatibility concerns when substituting these parts?

A: No. All substitute parts use the SOD-323 surface mount package, identical to the MM3Z43VT1. PCB footprints and reflow soldering profiles remain unchanged.

Q: Does the increased power rating of substitute parts affect circuit operation?

A: No. Higher power ratings (300 mW versus 200 mW) indicate increased thermal capability. The zener voltage regulation and impedance characteristics remain constant. Circuits designed for 200 mW operation function identically with 300 mW rated components.

Q: What compliance certifications apply to substitute parts?

A: All substitute parts carry ROHS3 compliance certification and REACH unaffected status. The original MM3Z43VT1 is RoHS non-compliant. Substitute parts meet current environmental and regulatory requirements for new designs and production.

Q: Can BZX384 series parts be used interchangeably with MM3Z43 series parts?

A: Yes, for the 43 V specification. Both BZX384-B43,115 and BZX384-C43,115 maintain the 43 V zener voltage, SOD-323 package, and operating temperature range. Electrical performance differences are limited to tolerance and reverse leakage specifications.

Q: Which substitute part should be selected for new designs?

A: Selection depends on design requirements. For tolerance-critical applications, BZX384-B43,115 (±2%) is appropriate. For general-purpose applications with standard tolerance requirements, MM3Z43VT1G or BZX384-C43,115 are suitable. All three parts are active product status with confirmed availability.