onsemi SZMMSZ4690ET3G

Overview

SZMMSZ4690ET3G from onsemi is a 5.6 V nominal Zener voltage regulator diode in the SOD-123 surface-mount package, rated for 500 mW power dissipation at 75 °C on FR-5 board, with 10 µA maximum reverse leakage current at 4 V, ±5% Zener voltage tolerance, and AEC-Q101 qualification for automotive applications.

For engineers reviewing the SZMMSZ4690ET3G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy, thermal derating behavior, ESD robustness (>16 kV HBM), surge capability (225 W, 8 × 20 µs), and automotive-grade reliability compliance.

Technical Context

This discrete Zener diode operates in reverse breakdown to maintain stable reference voltage under varying load and temperature conditions. It features a junction-to-lead thermal resistance of 150 °C/W and junction-to-ambient resistance of 340 °C/W, enabling predictable power derating above 75 °C ambient or lead temperature.

The device exhibits a typical Zener impedance of 15 Ω at 20 mA test current and a temperature coefficient near 0 mV/°C for its 5.6 V nominal rating - indicating minimal voltage drift across −55 °C to +150 °C operating range.

Key Specifications

Pinout & Package

Package: SOD-123 (Case 425, 1.60 × 2.69 × 1.16 mm), surface-mount, cathode-indicated by band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSZ4690ET3G and BZX84-C5V6, SZMMSZ4690ET3G provides automotive-grade reliability, superior ESD immunity, and tighter thermal performance in the compact SOD-123 footprint - making it optimal for safety-critical or high-reliability deployments where board space and environmental robustness are constrained.

Availability

SZMMSZ4690ET3G is available at Aetrix Electronics and suitable for automotive body control units, industrial sensor interfaces, and medical diagnostic equipment requiring stable component supply, consistent parametric performance, and long-term lifecycle assurance.

Supply support for SZMMSZ4690ET3G 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.

SZMMSZ4xxxETxG is part of onsemi's AEC-Q101-qualified Zener regulator family designed specifically for automotive subsystems and mission-critical industrial controls requiring stable voltage references under harsh thermal and electrical conditions.

FAQ

What is the nominal Zener voltage of SZMMSZ4690ET3G?

The nominal Zener voltage of SZMMSZ4690ET3G is 5.6 V, with a guaranteed range of 5.32 V to 5.88 V at 10 mA test current (I_ZT). This value is specified at 25 °C and reflects the device's primary function as a precision voltage reference or clamp in power and signal conditioning circuits. The SZMMSZ4690ET3G achieves tight regulation due to its low dynamic impedance and near-zero temperature coefficient.

Is SZMMSZ4690ET3G suitable for automotive applications?

Yes, SZMMSZ4690ET3G is AEC-Q101 qualified and PPAP capable, confirming its suitability for automotive applications including body control modules, lighting drivers, and infotainment power supplies. Its construction, testing, and traceability meet automotive quality system requirements. The SZ prefix explicitly denotes compliance with automotive-specific site and process controls, distinguishing it from commercial-grade variants like MMSZ4690ET3G.

What is the maximum power dissipation for SZMMSZ4690ET3G on a standard PCB?

SZMMSZ4690ET3G delivers 500 mW total power dissipation on FR-5 board at 75 °C lead temperature, derating linearly at 6.7 mW/°C above that point. This rating assumes the minimum recommended footprint per onsemi's SOD-123 layout guidelines. Actual dissipation depends on copper area, layer count, and airflow - but the 500 mW spec enables reliable operation in compact, unventilated enclosures typical of automotive and industrial designs.

Does SZMMSZ4690ET3G have Pb-free packaging?

Yes, SZMMSZ4690ET3G uses a Pb-free SOD-123 package compliant with RoHS Directive 2011/65/EU and ELV requirements. The "G" suffix in the part number explicitly indicates Pb-free construction. The device supports standard lead-free reflow profiles, with a maximum soldering temperature of 260 °C for 10 seconds, and features a corrosion-resistant, easily solderable finish per the datasheet mechanical specifications.

What is the reverse leakage current specification for SZMMSZ4690ET3G?

SZMMSZ4690ET3G specifies a maximum reverse leakage current (I_R) of 10 µA at V_R = 4 V and T_A = 25 °C. This low leakage ensures minimal quiescent current draw in voltage-reference and protection circuits, preserving battery life in portable systems and maintaining accuracy in high-impedance bias networks. Leakage remains well-controlled across the full −55 °C to +150 °C operating range, supporting stable performance in extreme environments.