onsemi SZMMSZ4717T1G

Overview

SZMMSZ4717T1G from onsemi is a 43 V nominal Zener diode in SOD−123 package, rated for 500 mW power dissipation at TL = 75°C, with 50 µA test current (IZT), 0.01 µA leakage at 32.6 V reverse bias, and ±5% voltage tolerance. It serves as a precision voltage reference or overvoltage clamp in automotive power rails and industrial sensor signal conditioning circuits.

For engineers reviewing the SZMMSZ4717T1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy at IZT = 50 µA, low IR at VR = 32.6 V, thermal derating above 75°C, and AEC−Q101 qualification for automotive use.

Technical Context

This device operates as a two-terminal voltage regulator in reverse breakdown mode, with nominal Zener voltage of 43 V measured at IZT = 50 µA and TL = 30°C ±1°C. Its dynamic impedance (ZZT) is optimized for stable regulation under low-current conditions typical in biasing and reference applications.

The SOD−123 package enables high-density PCB layout while maintaining 150°C/W junction-to-lead thermal resistance and 340°C/W junction-to-ambient rating on FR−5 board. ESD robustness exceeds 16 kV per Human Body Model, supporting reliable automated assembly.

Key Specifications

Pinout & Package

SOD−123 surface-mount package (1.60 × 2.69 × 1.16 mm), void-free thermosetting plastic case with cathode polarity band marking. Designed for reflow soldering at 260°C for 10 seconds.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMSZ4717T1G and BZX84-C43LT1G, SZMMSZ4717T1G uniquely combines AEC−Q101 qualification, 500 mW power handling, and sub-0.01 µA leakage at 32.6 V - making it the sole option for automotive-clamp and high-reliability industrial reference designs requiring all three attributes.

Availability

SZMMSZ4717T1G is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor reference circuits, and programmable logic controller input protection requiring stable component supply and full traceability.

Supply support for SZMMSZ4717T1G 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.

The MMSZ4xxxT1G/SZMMSZ4xxxT1G series was designed specifically for compact, high-reliability voltage regulation in space-constrained and mission-critical systems - especially where AEC−Q101 compliance and low-leakage performance are mandatory.

FAQ

What is the nominal Zener voltage of SZMMSZ4717T1G and how is it tested?

The nominal Zener voltage of SZMMSZ4717T1G is 43 V, measured at IZT = 50 µA with the device junction in thermal equilibrium at TL = 30°C ±1°C. This value falls within the specified min/max range of 40.85 V to 45.15 V. The test condition ensures repeatability and reflects real-world regulation behavior under controlled thermal conditions, as defined in the onsemi datasheet revision 13.

Is SZMMSZ4717T1G suitable for automotive applications?

Yes, SZMMSZ4717T1G is AEC−Q101 qualified and PPAP capable, with an SZ prefix indicating compliance with automotive-specific site and control change requirements. Its −55°C to +150°C junction temperature range, 16 kV HBM ESD rating, and validated manufacturing controls make it appropriate for under-hood and body-control module applications where reliability is critical.

What is the maximum power dissipation for SZMMSZ4717T1G and how does it derate with temperature?

SZMMSZ4717T1G has a maximum power dissipation of 500 mW at TL = 75°C on FR−5 board. Above 75°C, it derates linearly at 6.7 mW/°C. This means at 100°C lead temperature, usable power drops to 332.5 mW. Derating ensures safe operation without exceeding the 150°C absolute maximum junction temperature.

How does the leakage current of SZMMSZ4717T1G compare to similar 43 V Zeners?

SZMMSZ4717T1G specifies only 0.01 µA reverse leakage current at VR = 32.6 V, significantly lower than alternatives like BZX84-C43LT1G (0.1 µA at 34.4 V). This ultra-low IR minimizes parasitic loading in high-impedance reference paths and extends battery life in always-on sensor nodes where SZMMSZ4717T1G is deployed.

What package type and dimensions does SZMMSZ4717T1G use?

SZMMSZ4717T1G uses the SOD−123 surface-mount package (case 425, style 1), measuring 1.60 mm × 2.69 mm × 1.16 mm. It features a cathode polarity band, Pb−free construction, and is rated for 260°C reflow soldering for 10 seconds. The standardized footprint supports compatibility with automated assembly equipment and IPC-compliant PCB layouts.