onsemi SZMMSZ4692T1G

Overview

SZMMSZ4692T1G from onsemi is a 6.8 V ±5% Zener voltage regulator diode in SOD−123 package, rated for 500 mW power dissipation at TL = 75°C, with 50 µA test current (IZT), 10 µA reverse leakage at 5.1 V (IR), 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 SZMMSZ4692T1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, dynamic impedance, temperature coefficient, thermal derating behavior, and AEC−Q101 qualification status for automotive-grade reliability.

Technical Context

This device operates as a two-terminal silicon Zener diode with sharp reverse breakdown at nominal 6.8 V, designed for stable voltage regulation under low-current conditions (IZT = 50 µA). Its low leakage (IR = 10 µA @ VR = 5.1 V) and tight voltage tolerance (±5%) support accurate biasing in sensor interfaces and ADC reference circuits.

The SOD−123 package enables high-density PCB layout while maintaining thermal resistance of 340°C/W (junction-to-ambient) and 150°C/W (junction-to-lead), with ESD rating >16 kV (HBM Class 3) and Pb−Free/RoHS compliance per AEC−Q101 requirements for automotive electronics.

Key Specifications

Pinout & Package

SOD−123 surface-mount plastic package (Case 425), dimensions 1.60 × 2.69 × 1.16 mm, cathode marked by band, polarity confirmed per marking diagram: Pin 1 = Cathode, Pin 2 = Anode.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSZ4692T1G and BZX84-C6V8LT1G, SZMMSZ4692T1G provides automotive-grade reliability via AEC−Q101 qualification and superior thermal performance (340°C/W RJA), making it the preferred choice for safety-critical voltage clamping where long-term stability under temperature cycling is mandatory.

Availability

SZMMSZ4692T1G is available at Aetrix Electronics and suitable for automotive power management, industrial sensor signal conditioning, USB interface protection, and programmable logic controller input stage design requiring stable component supply and full traceability.

Supply support for SZMMSZ4692T1G 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 manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT applications.

SZMMSZ4xxxT1G series was developed specifically for automotive electronics requiring AEC−Q101 qualification, offering robust Zener regulation in compact SOD−123 packages with enhanced ESD immunity and thermal performance.

FAQ

What is the nominal Zener voltage and tolerance of SZMMSZ4692T1G?

The SZMMSZ4692T1G has a nominal Zener voltage of 6.8 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 6.46 V and 7.14 V when tested at IZT = 50 µA and TA = 25°C. This tight tolerance supports precise voltage referencing in automotive and industrial circuits where regulation accuracy directly impacts system reliability. The SZMMSZ4692T1G maintains this specification across its full operating temperature range.

Is SZMMSZ4692T1G qualified for automotive applications?

Yes, SZMMSZ4692T1G is AEC−Q101 qualified and PPAP capable, meeting stringent automotive reliability standards for temperature cycling, humidity resistance, and mechanical shock. Its SZ prefix denotes dedicated automotive process control and site-specific change management-unlike the commercial MMSZ4692T1G variant. Engineers selecting SZMMSZ4692T1G for engine control units or ADAS modules can rely on its validated lifetime performance under harsh vehicle environments.

What is the maximum power dissipation of SZMMSZ4692T1G and how does it derate with temperature?

SZMMSZ4692T1G 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. At 100°C lead temperature, its usable power drops to approximately 332 mW. This derating behavior is critical for thermal design in enclosed automotive ECUs-engineers must verify board layout, copper area, and airflow to maintain TL ≤ 75°C for full-rated operation of SZMMSZ4692T1G.

How does the reverse leakage current of SZMMSZ4692T1G compare to similar Zeners?

SZMMSZ4692T1G exhibits 10 µA reverse leakage current at VR = 5.1 V, significantly lower than many competing 6.8 V Zeners (e.g., BZX84-C6V8LT1G specifies 50 µA at same VR). This low IR minimizes parasitic current draw in high-impedance sensor bias networks and battery-powered systems. For applications like thermistor signal conditioning, SZMMSZ4692T1G's leakage contributes <0.1% error to reference voltage accuracy-critical for 12-bit ADC resolution.

What package type and mounting specifications apply to SZMMSZ4692T1G?

SZMMSZ4692T1G uses the SOD−123 surface-mount package (Case 425), measuring 1.60 × 2.69 × 1.16 mm, with cathode indicated by a band. It supports reflow soldering up to 260°C for 10 seconds and complies with IPC/JEDEC J-STD-020 moisture sensitivity level 1. The package's low profile and standardized footprint enable automated placement in high-density automotive PCBs-ensuring consistent assembly yield for SZMMSZ4692T1G across production runs.