onsemi SZMM3Z16VST1G

Overview

SZMM3Z16VST1G from onsemi is a 16 V ±3.9% Zener diode in SOD−323 package, rated for 500 mW steady-state power dissipation, with 80 Ω dynamic impedance at 5 mA test current and 0.05 μA reverse leakage at 11.2 V, used for precision voltage regulation in space-constrained portable electronics.

For engineers reviewing the SZMM3Z16VST1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±3.9%), low-profile SOD−323 footprint (1.7 mm × 1.25 mm × 0.9 mm), AEC−Q101 qualification, 16 kV HBM ESD rating, and tight thermal coefficient (10.4 mV/°C).

Technical Context

This device operates as a two-terminal voltage reference, clamping reverse-biased voltage at nominal 16.18 V with ±3.9% initial tolerance and 10.4 mV/°C temperature coefficient. It maintains regulation under 5 mA test current with 80 Ω dynamic impedance and exhibits only 0.05 μA leakage at 11.2 V.

Designed for surface-mount use on FR-4 PCBs, it supports 500 mW dissipation at 25°C with 250°C/W junction-to-ambient thermal resistance when mounted on a 38 mm² copper heatsink, and features Pb-free, RoHS-compliant construction with UL 94 V-0 flammability rating.

Key Specifications

Pinout & Package

SOD−323 surface-mount package: 1.70 mm × 1.25 mm × 0.90 mm body, cathode indicated by polarity band, compatible with standard reflow profiles (260°C for 10 s).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX384-B16,115 and MMSZ4687T1G, SZMM3Z16VST1G delivers tighter voltage tolerance, lower dynamic impedance, and automotive qualification in the smallest SOD−323 footprint-making it optimal for next-generation space- and reliability-critical designs.

Availability

SZMM3Z16VST1G is available at Aetrix Electronics and suitable for smartphone power management, automotive cabin sensors, and high-density PC board voltage reference applications requiring stable component supply and long-term lifecycle support.

Supply support for SZMM3Z16VST1G 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The MM3Z/SZMM3Z series was designed specifically for compact, high-reliability voltage regulation in portable and automotive electronics-emphasizing tight tolerance, low profile, and AEC−Q101 compliance.

FAQ

What is the exact Zener voltage range for SZMM3Z16VST1G at 25°C?

The SZMM3Z16VST1G has a guaranteed Zener voltage range of 15.85 V to 16.51 V when tested at 5 mA reverse current and 25°C ambient temperature. This ±3.9% tolerance is specified in the Electrical Characteristics table on page 3 of the official onsemi datasheet. The nominal value is 16.18 V, and the device maintains this regulation window across its qualified operating temperature range.

Is SZMM3Z16VST1G suitable for automotive applications?

Yes, SZMM3Z16VST1G is AEC−Q101 qualified and PPAP capable, with the "SZ" prefix explicitly indicating compliance for automotive and other applications requiring unique site and process controls. Its construction meets automotive reliability standards, including 16 kV HBM ESD rating and operation from −65°C to +150°C junction temperature-making it appropriate for cabin sensors, body control modules, and infotainment power rails.

What is the maximum power dissipation of SZMM3Z16VST1G on a standard PCB?

SZMM3Z16VST1G supports 500 mW steady-state power dissipation when mounted on an FR-4 board with a 0.72 mm² pad and 38 mm² copper heatsink (per Note 2 in the Maximum Ratings table). On a standard single-sided FR-4 board with 1 cm² copper (Note 1), the rating drops to 300 mW. Derating is required above 25°C at 4.0 mW/°C (heatsink case) or 2.4 mW/°C (standard board).

Does SZMM3Z16VST1G have RoHS and halogen-free compliance?

Yes, SZMM3Z16VST1G is Pb-free, halogen-free/BFR-free, and fully RoHS compliant per EU Directive 2011/65/EU. This is confirmed in the Specification Features section of the datasheet, and the "G" suffix in the part number denotes the Pb-free package. All external surfaces are corrosion resistant, and the void-free transfer-molded plastic case meets UL 94 V-0 flammability requirements.

What are the key mechanical dimensions of the SZMM3Z16VST1G package?

The SZMM3Z16VST1G uses the SOD−323 package (Case 477, Style 1) with exact dimensions of 1.70 mm length × 1.25 mm width × 0.90 mm height. The cathode is marked by a polarity band at Pin 1; the anode is Pin 2. The package weight is 4.507 mg/unit, and maximum soldering temperature is 260°C for 10 seconds-fully compatible with standard lead-free reflow profiles.