onsemi SZMMSZ5268BT1G

Overview

SZMMSZ5268BT1G from onsemi is a 5% tolerance, 82 V nominal Zener voltage regulator diode in SOD−123 surface-mount package, rated for 500 mW power dissipation at 75°C ambient, with 1.5 mA test current (IZT), 330 Ω dynamic impedance (ZZT), and 0.1 μA leakage current at 62 V reverse bias - used for precision voltage reference and overvoltage protection in power supply feedback loops.

For engineers reviewing the SZMMSZ5268BT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal derating behavior, junction-to-ambient thermal resistance (340°C/W), and AEC−Q101 qualification for automotive-grade reliability.

Technical Context

This device operates as a two-terminal voltage reference, maintaining stable reverse breakdown at 82 V ±5% under thermal equilibrium conditions (TL = 30°C ±1°C). Its Zener impedance is specified at 330 Ω @ IZT = 1.5 mA and 1 kHz AC signal, with low leakage (0.1 μA @ VR = 62 V) ensuring minimal standby current draw.

The SOD−123 package supports automated assembly and delivers 500 mW power handling on FR−5 board, with thermal resistance of 340°C/W (junction-to-ambient) and 150°C/W (junction-to-lead), enabling operation across −55°C to +150°C junction temperature range.

Key Specifications

Pinout & Package

SOD−123 surface-mount plastic package (1.60 × 2.69 × 1.16 mm), void-free thermosetting case with corrosion-resistant, solderable finish; cathode indicated by polarity band; UL 94 V−0 flammability rating; max soldering temperature 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 MMSZ5268BT1G and SZMMBZ5268BLT1G, SZMMSZ5268BT1G uniquely combines AEC−Q101 qualification, 500 mW SOD−123 packaging, and 82 V ±5% regulation - making it the sole option for automotive-grade, space-constrained, high-power Zener reference applications.

Availability

SZMMSZ5268BT1G is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, telecom power supplies, and medical diagnostic equipment requiring stable component supply with full traceability and lifecycle management.

Supply support for SZMMSZ5268BT1G 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 MMSZ52xxxT1G/SZMMSZ52xxxT1G series was designed specifically for high-reliability, surface-mount Zener regulation in space-constrained and thermally demanding environments - emphasizing automotive qualification, low leakage, and tight voltage tolerance.

FAQ

What is the nominal Zener voltage and tolerance of SZMMSZ5268BT1G?

The SZMMSZ5268BT1G has a nominal Zener voltage of 82 V with a ±5% tolerance, meaning its actual breakdown voltage falls between 77.9 V and 86.1 V when tested at IZT = 1.5 mA under thermal equilibrium conditions (TL = 30°C ±1°C). This tolerance is confirmed in the onsemi datasheet's 5% tolerance electrical characteristics table, and the "B" suffix explicitly denotes this tolerance grade. The SZMMSZ5268BT1G maintains this specification across its full operating temperature range.

Is SZMMSZ5268BT1G qualified for automotive applications?

Yes, SZMMSZ5268BT1G is AEC−Q101 qualified and PPAP capable, as stated in the onsemi datasheet features section. The "SZ" prefix identifies it as meeting automotive-specific site and process control requirements, including enhanced traceability, lot-level documentation, and rigorous reliability testing. This makes SZMMSZ5268BT1G suitable for use in engine control units, body electronics, and ADAS modules where automotive-grade component validation is mandatory.

What is the maximum power dissipation and thermal derating behavior of SZMMSZ5268BT1G?

SZMMSZ5268BT1G 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 is 340°C/W (junction-to-ambient) and 150°C/W (junction-to-lead), allowing safe operation up to +150°C junction temperature. These values are measured per infrared scan method and apply to standard PCB footprints - exceeding them risks permanent degradation of the SZMMSZ5268BT1G's Zener characteristics.

What package type and dimensions does SZMMSZ5268BT1G use?

SZMMSZ5268BT1G uses the SOD−123 surface-mount package (Case 425, Style 1), measuring 1.60 × 2.69 × 1.16 mm. It features a void-free thermosetting plastic case, corrosion-resistant finish, UL 94 V−0 flammability rating, and cathode polarity indicated by a band. The package is optimized for automated board assembly and high-density layouts - identical in form factor to other MMSZ52xxxT1G series devices, ensuring mechanical compatibility in existing designs using SZMMSZ5268BT1G.

How does the leakage current of SZMMSZ5268BT1G compare to lower-voltage Zeners in the same series?

SZMMSZ5268BT1G specifies 0.1 μA maximum reverse leakage current at VR = 62 V, which is consistent with higher-voltage members of the MMSZ52xxxT1G series (e.g., MMSZ5270BT1G: 0.1 μA @ 69 V). In contrast, lower-voltage variants like MMSZ5221BT1G specify 0.25 μA @ 100 V - demonstrating that leakage is not strictly voltage-proportional but reflects optimized doping profiles. This low leakage ensures minimal error in high-impedance reference circuits where SZMMSZ5268BT1G is deployed.