onsemi MM3Z4V3C

Overview

MM3Z4V3C from onsemi is a 4.3 V ±5% Zener diode in SOD−323FL package, rated for 200 mW power dissipation, with 84 Ω dynamic impedance at 5 mA test current and 2.7 µA reverse leakage at 1 V reverse voltage. It provides precision voltage regulation in low-power analog reference and overvoltage protection circuits.

For engineers reviewing the MM3Z4V3C datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, thermal resistance (595 °C/W), junction temperature limit (150 °C), cathode-anode polarity, and SMD land pattern compatibility with JEDEC SOD−323FL footprint.

Technical Context

The MM3Z4V3C operates as a two-terminal voltage reference device, conducting in reverse breakdown to maintain stable 4.3 V across its terminals when biased above its knee voltage. Its 5 mA zener test current (IZT) and 1 mA knee current (IZK) define operational boundaries for regulation accuracy and low-current stability.

Designed for surface-mount use on standard PCBs with minimum copper land pads, it relies on its 595 °C/W junction-to-ambient thermal resistance and 150 °C maximum junction temperature to sustain reliable operation under continuous DC bias within its 200 mW power limit.

Key Specifications

Pinout & Package

SOD−323FL package: ultra-thin, surface-mount plastic case with gull-wing leads; dimensions per CASE 477AB; matte tin (Sn) finish; Pb-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener diode applications.

Compared with BZX384-B4V3 and MMSZ4V3ET1G, the MM3Z4V3C offers the thinnest SOD−323FL profile and tightest thermal interface for ultra-compact, low-profile designs-critical where height clearance or PCB flexure is constrained, though at lower absolute power handling than the SOD-123 alternative.

Availability

MM3Z4V3C is available at Aetrix Electronics and suitable for low-power voltage reference, overvoltage clamping, and DC-DC feedback applications requiring stable component supply and RoHS-compliant SMD Zener diodes.

Supply support for MM3Z4V3C includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

onsemi (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.

The MM3Z series belongs to onsemi's precision Zener diode product line, engineered specifically for space-constrained, low-power voltage regulation and protection in portable and high-density electronics.

FAQ

What is the zener voltage tolerance of MM3Z4V3C?

The MM3Z4V3C has a nominal zener voltage of 4.3 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 4.09 V and 4.52 V when tested at 5 mA (IZT). This tolerance is confirmed in the Electrical Characteristics table of the official onsemi datasheet Rev. 3 (August 2023), and applies across the full operating temperature range unless otherwise specified. The MM3Z4V3C maintains this specification under standard pulse-test conditions.

What package type does MM3Z4V3C use?

The MM3Z4V3C uses the SOD−323FL package - a thin, surface-mount plastic case defined as CASE 477AB in onsemi's mechanical drawings. It features gull-wing leads, matte tin (Sn) finish, and is Pb-free and RoHS compliant. This package is dimensionally distinct from standard SOD-323 and optimized for low-profile assembly. The MM3Z4V3C's footprint and soldering requirements align strictly with JEDEC SOD−323FL specifications.

What is the maximum power dissipation for MM3Z4V3C?

The MM3Z4V3C has a maximum power dissipation (PD) of 200 mW at TA = 25 °C, as specified in the Absolute Maximum Ratings table. This rating assumes mounting on a PCB with minimum land pad area; derating is required above 25 °C ambient, following the 595 °C/W junction-to-ambient thermal resistance. Exceeding 200 mW risks permanent damage, and the MM3Z4V3C must be applied within this limit for reliable long-term operation.

How much reverse leakage current does MM3Z4V3C exhibit?

The MM3Z4V3C exhibits a maximum reverse leakage current (IR) of 2.7 µA at VR = 1 V, per the Electrical Characteristics table. This value is measured under standard test conditions (TA = 25 °C) and reflects the device's ability to block current below its zener knee. At voltages significantly below 1 V, leakage is substantially lower. This parameter directly impacts quiescent power in high-impedance reference circuits using the MM3Z4V3C.

Is MM3Z4V3C suitable for automotive applications?

The MM3Z4V3C is not AEC-Q200 qualified and is not recommended for automotive safety-critical systems. However, its 150 °C maximum junction temperature, Pb-free/RoHS compliance, and stable ±5% VZ tolerance make it suitable for non-safety automotive subsystems such as infotainment power rails or cabin sensor references - provided full qualification testing is performed by the end customer. The MM3Z4V3C datasheet does not claim automotive grade reliability.