onsemi MMSZ4703ET3

Overview

MMSZ4703ET3 from onsemi is a 16 V nominal Zener voltage regulator diode in SOD−123 package, rated for 500 mW power dissipation at 75°C on FR−5 board, with 0.05 µA reverse leakage at 12.1 V and ±5% voltage tolerance. It serves as a precision voltage reference or overvoltage clamp in low-power analog circuits, automotive sensor interfaces, and industrial power supply feedback loops.

For engineers reviewing the MMSZ4703ET3 datasheet, pinout, applications, or equivalent options, key selection criteria include its 16 V nominal Zener voltage, 50 mA test current (IZT), 150 °C maximum junction temperature, ESD rating >16 kV (HBM), and AEC−Q101 qualification for automotive use.

Technical Context

This device operates in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. Its dynamic impedance is 40 Ω at 1 mA and 20 Ω at 20 mA, enabling effective regulation in low-current bias networks and reference dividers.

The MMSZ4703ET3 exhibits a positive temperature coefficient of +8.5 mV/°C near 16 V, supporting predictable thermal drift behavior in compensated designs. It is qualified per AEC−Q101 and features Pb−free construction with UL 94 V−0 flammability rating and void-free thermosetting plastic case.

Key Specifications

Pinout & Package

SOD−123 surface-mount package: 2-terminal, cathode-banded, void-free thermosetting plastic case with UL 94 V−0 rating and 260°C soldering tolerance (10 s).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C16 and MMSZ5245B, the MMSZ4703ET3 delivers superior thermal performance at elevated temperatures, guaranteed automotive qualification, and industry-leading ESD robustness-making it the preferred choice where reliability, temperature stability, and surge immunity are design-critical.

Availability

MMSZ4703ET3 is available at Aetrix Electronics and suitable for automotive sensor biasing, industrial power supply feedback, and IoT node overvoltage protection requiring stable component supply, long-term lifecycle support, and AEC−Q101 compliance.

Supply support for MMSZ4703ET3 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 MMSZ4xxxET3 series belongs to onsemi's precision Zener regulator family, engineered specifically for high-reliability voltage reference and clamping in automotive and industrial systems where AEC−Q101 qualification and thermal stability are mandatory.

FAQ

What is the nominal Zener voltage and tolerance of the MMSZ4703ET3?

The MMSZ4703ET3 has a nominal Zener voltage of 16 V with a tolerance of ±5%, specified as 15.2 V minimum to 16.8 V maximum at I_ZT = 50 mA and T_A = 25°C. This tolerance band ensures predictable clamping behavior in production designs without requiring post-manufacture binning or calibration. The MMSZ4703ET3 maintains this specification across its full operating temperature range when used within derated power limits.

Is the MMSZ4703ET3 qualified for automotive applications?

Yes, the MMSZ4703ET3 is AEC−Q101 qualified and PPAP capable, meeting stress testing requirements for temperature cycling, humidity, mechanical shock, and high-temperature operating life. It is explicitly intended for automotive use cases such as engine control, body electronics, and ADAS sensor interfaces. The MMSZ4703ET3 also carries the SZ prefix option (SZMMSZ4703ET3G) for applications requiring dedicated automotive change control and site traceability.

What is the maximum power dissipation of the MMSZ4703ET3 at 75°C?

The MMSZ4703ET3 is rated for 500 mW total power dissipation at lead temperature (T_L) = 75°C on FR−5 board, with linear derating of 6.7 mW/°C above that temperature. At 100°C lead temperature, its usable power drops to approximately 333 mW. This derating curve is validated per JEDEC JESD51 standards and enables reliable thermal design in convection-cooled automotive and industrial PCBs without forced airflow.

Does the MMSZ4703ET3 have ESD protection, and what level is specified?

The MMSZ4703ET3 features Class 3 human body model (HBM) ESD protection rated at >16 kV, verified per ANSI/ESDA/JEDEC JS-001. This level exceeds standard IEC 61000-4-2 Level 4 requirements and eliminates the need for external ESD components in most board-level implementations. The MMSZ4703ET3 achieves this through optimized die passivation and internal structure design, making it suitable for direct integration into exposed signal paths in automotive and industrial equipment.

What package type and marking does the MMSZ4703ET3 use?

The MMSZ4703ET3 uses the SOD−123 surface-mount package (Case 425−04), with cathode indicated by a band on terminal 1. Its marking code is "CJ4", visible as laser-etched or molded identifier on the device body. The "ET3" suffix denotes 10,000-piece tape-and-reel packaging in Pb−free configuration, compliant with RoHS Directive 2011/65/EU. The MMSZ4703ET3 shares footprint and soldering profile with other SOD−123 Zeners for manufacturing flexibility.