onsemi SZMMSZ4689ET1G

Overview

SZMMSZ4689ET1G from onsemi is a 5.1 V ±5% Zener diode in SOD-123 package, rated for 500 mW power dissipation at 75 °C on FR-5 board, with 10 µA reverse leakage at 3 V and 150 °C junction temperature rating - used for precision voltage reference and overvoltage protection in automotive sensor signal conditioning circuits.

For engineers reviewing the SZMMSZ4689ET1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (150 °C/W junction-to-lead), AEC-Q101 qualification, ESD robustness (>16 kV HBM), and SOD-123 footprint compatibility with high-density PCB layouts.

Technical Context

This device operates as a two-terminal voltage regulator in reverse-biased mode, maintaining stable 5.1 V output across 1–20 mA Zener test current range. Its dynamic impedance is ≤13 Ω at 20 mA, and temperature coefficient is +2.5 mV/°C near nominal voltage - enabling predictable drift compensation in temperature-sensitive analog front-ends.

Designed for automotive-grade reliability, it meets AEC-Q101 stress testing requirements and supports PPAP documentation. The SOD-123 package features Pb-free construction, UL 94 V-0 flammability rating, and 260 °C soldering tolerance for reflow compatibility.

Key Specifications

Pinout & Package

SOD-123 surface-mount package: 2-pin, cathode-indicated by band; dimensions 1.60 × 2.69 × 1.16 mm; void-free thermosetting plastic case with corrosion-resistant finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSZ4689ET1G and BZX84-C5V1LT1G, SZMMSZ4689ET1G offers automotive qualification, tighter 5% tolerance, and superior thermal performance in the compact SOD-123 footprint - making it optimal for space-constrained, mission-critical voltage reference roles.

Availability

SZMMSZ4689ET1G is available at Aetrix Electronics and suitable for automotive sensor modules, industrial analog input protection, and medical device power monitoring requiring stable component supply and long-term lifecycle assurance.

Supply support for SZMMSZ4689ET1G 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 applications.

The MMSZ4xxx/SZMMSZ4xxx series targets precision voltage regulation in space-constrained, high-reliability systems - especially where AEC-Q101 compliance, low leakage, and thermal resilience are mandatory.

FAQ

What is the Zener voltage tolerance of SZMMSZ4689ET1G?

The SZMMSZ4689ET1G has a Zener voltage tolerance of ±5% around its nominal 5.1 V value, meaning the actual reverse breakdown voltage falls between 4.85 V and 5.36 V at 50 mA test current. This tolerance is specified at 25 °C and remains stable across its −55 to +150 °C operating range. The SZMMSZ4689ET1G datasheet confirms this range in the Electrical Characteristics table on page 2.

Is SZMMSZ4689ET1G qualified for automotive applications?

Yes, SZMMSZ4689ET1G is AEC-Q101 qualified and PPAP capable, as explicitly stated in the onsemi datasheet's Features section. The "SZ" prefix denotes automotive-grade manufacturing controls and site-specific change management. This qualification covers stress tests including temperature cycling, humidity bias, and mechanical shock - making SZMMSZ4689ET1G suitable for engine control units, body electronics, and ADAS subsystems.

What is the maximum reverse leakage current for SZMMSZ4689ET1G?

The maximum reverse leakage current for SZMMSZ4689ET1G is 10 µA at VR = 3 V and TA = 25 °C, per the Electrical Characteristics table. At elevated temperatures, leakage increases predictably - e.g., up to ~100 µA at 125 °C - but remains within specification limits. This low leakage supports energy-efficient operation in battery-powered devices where standby current must be minimized.

Can SZMMSZ4689ET1G replace MMSZ4689ET1G in existing designs?

SZMMSZ4689ET1G shares identical electrical specifications, SOD-123 package, and pinout with MMSZ4689ET1G, differing only in automotive qualification and traceability controls. No PCB layout change is needed. However, SZMMSZ4689ET1G requires PPAP documentation and may have different lot traceability protocols - so replacement is appropriate only when AEC-Q101 compliance is required or desired for supply chain robustness.

What is the thermal resistance from junction to lead for SZMMSZ4689ET1G?

The thermal resistance from junction to lead (RJL) for SZMMSZ4689ET1G is 150 °C/W, as specified in the Maximum Ratings table. This value reflects heat conduction efficiency from the silicon die to the PCB copper via the SOD-123 leads. It enables accurate thermal modeling when designing for continuous operation at 500 mW, particularly in high-ambient-temperature environments like automotive under-hood applications.