onsemi SZMM5Z4686T1G

Overview

SZMM5Z4686T1G from onsemi is a 3.9 V ±5% Zener diode in SOD−523 package, rated for 500 mW power dissipation at 75°C, with 50 μA test current (IZT), 5 μA leakage at 2 V reverse bias, and ESD rating >16 kV (HBM). It provides precision voltage regulation in space-constrained portable electronics.

For engineers reviewing the SZMM5Z4686T1G datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance, thermal derating behavior, low-leakage performance at low VR, and automotive-grade AEC−Q101 qualification status.

Technical Context

This device operates as a two-terminal voltage reference diode with sharp reverse breakdown at 3.9 V nominal, specified under 50 μA IZT test condition and validated across −55°C to +150°C junction temperature range. Its SOD−523 package enables high-density placement while maintaining 250°C/W junction-to-ambient thermal resistance.

The SZ prefix denotes automotive-compliant manufacturing control, including PPAP capability and AEC−Q101 qualification. Electrical performance includes 5 μA maximum IR at VR = 2 V and temperature coefficient near zero for this voltage range, supporting stable regulation in battery-powered systems.

Key Specifications

Pinout & Package

SOD−523 surface-mount package (1.20 × 0.80 × 0.60 mm), void-free thermosetting plastic case with corrosion-resistant finish; cathode indicated by polarity band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX584-C3V9 and MMSZ4686T1G, SZMM5Z4686T1G uniquely combines AEC−Q101 qualification, PPAP support, and SOD−523 miniaturization-making it the only option qualified for safety-critical automotive subsystems requiring both size and reliability assurance.

Availability

SZMM5Z4686T1G is available at Aetrix Electronics and suitable for smartphone power rail protection, automotive cabin controller reference, and wearable sensor biasing requiring stable component supply across production lifecycles.

Supply support for SZMM5Z4686T1G 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 silicon solutions for automotive, industrial, cloud, medical, and IoT applications.

SZMM5Z4686T1G belongs to the MM5Z4xxx/SZMM5Z4xxx family of miniature Zener regulators designed specifically for high-density, low-power, and automotive-qualified voltage reference and transient suppression roles.

FAQ

What is the Zener voltage tolerance of SZMM5Z4686T1G?

The SZMM5Z4686T1G has a nominal Zener voltage of 3.90 V with a tolerance of ±5%, meaning the actual measured VZ falls between 3.70 V and 4.10 V when tested at IZT = 50 μA and TA = 25°C. This tight tolerance ensures predictable clamping behavior in precision reference and protection circuits where voltage margin is critical.

Is SZMM5Z4686T1G qualified for automotive applications?

Yes, SZMM5Z4686T1G is AEC−Q101 qualified and PPAP capable, with manufacturing controlled under automotive-specific site and change requirements. The "SZ" prefix explicitly denotes this qualification, making SZMM5Z4686T1G suitable for use in automotive body electronics, infotainment systems, and ADAS modules where reliability under extended temperature and vibration stress is mandatory.

What is the maximum reverse leakage current for SZMM5Z4686T1G?

The maximum reverse leakage current (IR) for SZMM5Z4686T1G is 5 μA when biased at VR = 2 V and measured at TA = 25°C. This low leakage supports ultra-low-power operation in battery-backed monitoring circuits and ensures minimal loading on high-impedance sensor bias networks where current draw must remain below 10 μA.

What package type does SZMM5Z4686T1G use, and what are its dimensions?

SZMM5Z4686T1G uses the SOD−523 surface-mount package (Case 502, Style 1), measuring 1.20 mm × 0.80 mm × 0.60 mm. Its small footprint and cathode polarity band enable high-density placement on compact PCBs, especially in smartphones, wearables, and automotive ECUs where board area is constrained.

How does the thermal derating of SZMM5Z4686T1G work above 75°C?

SZMM5Z4686T1G is rated for 500 mW power dissipation at lead temperature (TL) = 75°C, with linear derating of 4.0 mW/°C above that point. For example, at TL = 100°C, maximum allowable PD drops to 400 mW. This derating reflects junction-to-ambient thermal resistance of 250°C/W and must be applied when designing for sustained operation in elevated ambient environments.