onsemi SZMMSZ4693T3G

Overview

SZMMSZ4693T3G from onsemi is a 7.5 V nominal Zener voltage regulator diode in SOD−123 package, rated for 500 mW power dissipation at 75°C, with 50 µA test current (IZT), 10 µA reverse leakage at 5.7 V, and −55°C to +150°C operating temperature range-used for precision voltage reference and overvoltage protection in automotive power rails.

For engineers reviewing the SZMMSZ4693T3G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5% min/max), low IZT requirement, AEC−Q101 qualification, thermal resistance (RJA = 340°C/W), and Pb−free SOD−123 packaging for high-density automotive PCBs.

Technical Context

This device operates as a two-terminal silicon Zener diode optimized for stable reverse-bias voltage regulation. It achieves regulation via controlled avalanche and Zener breakdown mechanisms depending on nominal voltage-7.5 V falls in the transition region where both effects contribute, yielding moderate temperature coefficient (~+2.5 mV/°C per typical curve).

The SOD−123 package enables automated placement and reflow soldering with 260°C/10 s max soldering temperature. Its 1.60 × 2.69 × 1.16 mm footprint supports high-density layouts while maintaining thermal performance via low junction-to-lead resistance (RJL = 150°C/W) and defined cathode/anode polarity marking.

Key Specifications

Pinout & Package

SOD−123 surface-mount plastic package (Case 425, Style 1), 1.60 × 2.69 × 1.16 mm, void-free thermosetting case with corrosion-resistant finish and cathode polarity band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSZ4693T3G and BZX84-C7V5LT1G, SZMMSZ4693T3G uniquely combines AEC−Q101 qualification, 500 mW rating, and low 10 µA leakage-making it the only option qualified for automotive under-hood voltage reference and clamp functions requiring long-term reliability at elevated temperatures.

Availability

SZMMSZ4693T3G is available at Aetrix Electronics and suitable for automotive engine control units, industrial sensor transmitters, and medical diagnostic equipment requiring stable component supply with full traceability and lifecycle continuity.

Supply support for SZMMSZ4693T3G 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, and IoT applications.

SZMMSZ4xxxT3G series belongs to onsemi's automotive-grade Zener regulator family, designed specifically for AEC−Q101-compliant voltage reference, overvoltage protection, and biasing in harsh-environment electronic control modules.

FAQ

What is the nominal Zener voltage and tolerance of SZMMSZ4693T3G?

The SZMMSZ4693T3G has a nominal Zener voltage of 7.5 V with a minimum of 7.13 V and maximum of 7.88 V at IZT = 50 µA-corresponding to a ±5% tolerance band. This specification is measured at TL = 30°C ±1°C with the device junction in thermal equilibrium, and applies across the full −55°C to +150°C operating temperature range as validated per onsemi's AEC−Q101 qualification.

Is SZMMSZ4693T3G qualified for automotive applications?

Yes, SZMMSZ4693T3G is AEC−Q101 qualified and PPAP capable, with the "SZ" prefix indicating automotive-specific site and process controls. It meets stringent reliability testing for temperature cycling, humidity bias, and mechanical shock-making it suitable for engine control units, body electronics, and ADAS power domains where failure modes must be rigorously managed.

What is the maximum power dissipation and thermal derating behavior of SZMMSZ4693T3G?

SZMMSZ4693T3G is rated for 500 mW total power dissipation on FR−5 board at TL = 75°C, with linear derating of 6.7 mW/°C above that temperature. Its thermal resistance junction-to-ambient is 340°C/W, meaning a 500 mW load causes ~170°C rise above ambient-so operation at full power requires careful board layout and thermal management to stay within the −55°C to +150°C junction limit.

How does the reverse leakage current of SZMMSZ4693T3G compare to similar Zeners?

SZMMSZ4693T3G specifies 10 µA maximum reverse leakage current (IR) at VR = 5.7 V, which is significantly lower than many competing 7.5 V Zeners (e.g., BZX84-C7V5LT1G lists 25 µA). This low IR minimizes parasitic loading in high-impedance reference nodes and improves accuracy in battery-powered sensor bias circuits where quiescent current directly impacts runtime.

What package type and dimensions does SZMMSZ4693T3G use, and how is polarity marked?

SZMMSZ4693T3G uses the SOD−123 surface-mount package (Case 425, Style 1), measuring 1.60 × 2.69 × 1.16 mm. Polarity is marked by a cathode band at terminal 1; the unmarked end is the anode. The package is void-free, thermosetting plastic with UL 94 V−0 flammability rating and corrosion-resistant, easily solderable finish-optimized for automated assembly and reflow up to 260°C for 10 seconds.