onsemi MM3Z30VC

Overview

MM3Z30VC from onsemi is a 30 V ±5% tolerance Zener diode in SOD−323FL package, rated for 200 mW power dissipation, with 75 Ω zener impedance at 2 mA test current and 0.045 µA reverse leakage at 21 V. It provides precision voltage regulation in low-power reference and protection circuits.

For engineers reviewing the MM3Z30VC datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage tolerance, thermal resistance (595 °C/W), junction temperature limit (150 °C), and SOD−323FL footprint compatibility in space-constrained PCB designs.

Technical Context

This device operates as a two-terminal voltage reference using avalanche breakdown in silicon PN junction. Its 30 V nominal zener voltage is specified at 2 mA test current (IZT), with dynamic impedance measured under 10% AC superimposition on DC bias.

The SOD−323FL package features matte tin finish, Pb-free construction, and RoHS compliance. Thermal performance assumes mounting on PCB with minimum land pad, yielding 595 °C/W junction-to-ambient resistance.

Key Specifications

Pinout & Package

SOD−323FL is a surface-mount, two-terminal package with anode (Pin 1) and cathode (Pin 2) marked by cathode band. Dimensions: 1.7 mm × 1.25 mm × 0.95 mm height; matte tin finish; RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX384-B30,115 and MMSZ5257ET1G, the MM3Z30VC offers the smallest footprint among 30 V Zeners while maintaining tight impedance and leakage specs-ideal for miniaturized designs where board space is constrained but regulation precision remains essential.

Availability

MM3Z30VC is available at Aetrix Electronics and suitable for microcontroller reset circuits, ADC reference stabilization, overvoltage clamp protection, and LED driver current set applications requiring stable component supply and consistent parametric performance across production batches.

Supply support for MM3Z30VC 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 focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT markets.

The MM3Z series was designed specifically for compact, high-reliability voltage reference and protection functions in space-constrained portable and industrial electronics, emphasizing tight tolerance, low leakage, and robust thermal performance in miniature packages.

FAQ

What is the maximum reverse leakage current for MM3Z30VC at its rated voltage?

The MM3Z30VC exhibits a maximum reverse leakage current of 0.045 µA when biased at 21 V (70% of nominal 30 V zener voltage), as specified in the Electrical Characteristics table. This low leakage ensures minimal power loss in battery-operated systems and maintains accuracy in high-impedance reference nodes. The MM3Z30VC's leakage performance is confirmed under TA = 25 °C conditions and remains stable across its qualified temperature range.

Can MM3Z30VC be used in place of a 28 V or 33 V Zener diode?

No - the MM3Z30VC is strictly rated for 30 V nominal zener voltage (28.5–31.5 V range), and substituting it for 28 V or 33 V devices will cause regulation error exceeding system tolerances. For 28 V, consider MM3Z27VC (25.65–28.35 V); for 33 V, use MM3Z33VC (31.35–34.65 V). Each MM3Z30VC unit is laser-trimmed to its specific voltage bin and not interchangeable across the MM3ZxVC family without validation.

What is the thermal resistance of MM3Z30VC and how does it affect PCB layout?

The MM3Z30VC has a junction-to-ambient thermal resistance (R_JA) of 595 °C/W when mounted on a PCB with minimum land pad, per onsemi's characterization. This high R_JA means even at 200 mW dissipation, junction temperature rise can exceed 100 °C above ambient - requiring thermal relief cuts, increased copper area, or adjacent via stitching to maintain safe operation below 150 °C. Layout must follow Case 477AB footprint guidelines precisely to achieve this spec.

Is MM3Z30VC compatible with lead-free reflow soldering processes?

Yes - the MM3Z30VC features matte tin (Sn) finish and is explicitly rated for Pb-free assembly. It meets JEDEC J-STD-020 moisture sensitivity level 1 (unlimited floor life) and withstands peak reflow temperatures up to 260 °C per standard lead-free profiles. The SOD−323FL package body is qualified for IPC/JEDEC standards, and no special pre-bake or handling is required prior to soldering the MM3Z30VC.

How is the zener impedance of MM3Z30VC measured and why does it matter?

The MM3Z30VC's zener impedance (Z_ZT = 75 Ω max) is measured by superimposing a 10% RMS AC current on a 2 mA DC bias (IZT), then calculating ΔV/ΔI from the resulting AC voltage ripple. This value directly impacts regulation accuracy under varying load: lower Z_ZT means less output voltage shift when current changes - critical for precision references. The MM3Z30VC's 75 Ω spec ensures <2.25 mV deviation per 30 µA load step, verified per onsemi's test methodology.