onsemi MM3Z39VC

Overview

MM3Z39VC from onsemi is a 39 V ±5% tolerance Zener diode in SOD−323FL package, rated for 200 mW power dissipation, with 122 Ω zener impedance at 2 mA test current and 0.045 µA reverse leakage at 27.3 V. It provides precision voltage regulation in low-power reference and protection circuits.

For engineers reviewing the MM3Z39VC datasheet, pinout, applications, or equivalent options, key selection criteria include its 39 V nominal zener voltage, ±5% tolerance, 200 mW power rating, SOD−323FL footprint compatibility, and low reverse leakage performance at rated VR.

Technical Context

This device operates as a two-terminal voltage reference using avalanche breakdown in silicon PN junction. Its 39 V nominal zener voltage is specified at IZT = 2 mA with typical zener impedance of 122 Ω, and it maintains stable regulation across −65 °C to +150 °C storage temperature range.

The MM3Z39VC exhibits 0.045 µA maximum reverse leakage current at VR = 27.3 V and supports forward conduction up to 1.0 V at IF = 10 mA. Thermal resistance is 595 °C/W (junction-to-ambient) when mounted on PCB with minimum land pad.

Key Specifications

Pinout & Package

SOD−323FL is a 2-pin surface-mount package with anode (pin 1) and cathode (pin 2) terminals. Cathode is marked by a band on the package body.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX384-B39,115 and MMSZ4702T1G, the MM3Z39VC offers optimal balance of ultra-compact SOD−323FL size, 200 mW rating, and low-leakage performance-making it preferred for space- and power-constrained reference designs where precise 39 V regulation is required.

Availability

MM3Z39VC is available at Aetrix Electronics and suitable for industrial sensor reference, USB port overvoltage clamp, and low-power IoT node regulator applications requiring stable component supply and consistent parametric performance.

Supply support for MM3Z39VC 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 specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The MM3Z series is part of onsemi's precision Zener diode portfolio designed for compact, high-reliability voltage reference and protection in space-constrained, low-power electronic systems.

FAQ

What is the nominal zener voltage and tolerance of MM3Z39VC?

The MM3Z39VC has a nominal zener voltage of 39 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 37.05 V and 40.95 V when tested at I_ZT = 2 mA. This specification is confirmed in the Electrical Characteristics table of the official onsemi datasheet (Rev. 3, August 2023). The MM3Z39VC maintains this tolerance across its qualified operating temperature range and is intended for use in precision reference applications where tight voltage control is required.

What package type does MM3Z39VC use and what are its key mechanical features?

The MM3Z39VC uses the SOD−323FL package (Case 477AB), a miniature surface-mount outline measuring 1.7 mm × 1.25 mm × 0.95 mm. It features matte tin (Sn) finish, Pb-free construction, and RoHS compliance. The cathode is marked by a band on the package body, and pin 1 is the anode, pin 2 the cathode. This package enables high-density PCB layouts and compatibility with standard 0.4 mm pitch reflow processes. The MM3Z39VC's SOD−323FL footprint is identical to other members of the MM3Z2V4C–MM3Z75VC family.

What is the maximum power dissipation and thermal resistance of MM3Z39VC?

The MM3Z39VC has a maximum power dissipation (P_D) of 200 mW at T_A = 25 °C, with thermal resistance (R_JA) of 595 °C/W when mounted on a PCB with minimum land pad. This means junction temperature rises approximately 119 °C per 200 mW applied-so operation near full rating requires careful thermal design. Derating is necessary above 25 °C ambient; for example, at 70 °C ambient, usable power drops to ~130 mW. The MM3Z39VC's thermal limits are defined in the Absolute Maximum Ratings table of the onsemi datasheet.

How does the reverse leakage current of MM3Z39VC compare to similar Zener diodes?

The MM3Z39VC specifies a maximum reverse leakage current (I_R) of 0.045 µA at V_R = 27.3 V, which is significantly lower than many competing 39 V Zeners-e.g., BZX384-B39 shows 0.1 µA at same VR, and MMSZ4702T1G shows 0.1 µA at 31.2 V. This low leakage minimizes loading error in high-impedance reference circuits and improves battery efficiency in always-on applications. The MM3Z39VC achieves this performance through optimized process control and is verified per the Electrical Characteristics table in the official onsemi datasheet.

Is MM3Z39VC suitable for automotive applications and what temperature ratings support that use?

The MM3Z39VC supports automotive body electronics applications due to its −65 °C to +150 °C storage temperature range and 150 °C maximum junction temperature. While not AEC-Q200 qualified out-of-box, its thermal and electrical specs align with under-dash and non-safety-critical ECU requirements-such as LIN bus voltage monitoring or interior lighting control. Designers must validate reliability per system-level stress testing. The MM3Z39VC's SOD−323FL package and low leakage make it viable for thermally demanding zones where space is limited, provided board-level thermal management is implemented.