onsemi SZMMSZ5262BT1G

Overview

SZMMSZ5262BT1G from onsemi is a 51 V ±5% Zener diode in SOD−123 package, rated for 500 mW power dissipation at TL = 75°C, with 125 Ω dynamic impedance at 2.5 mA test current and 0.1 μA leakage at 39 V reverse bias - used for precision voltage reference and overvoltage protection in automotive power management circuits.

For engineers reviewing the SZMMSZ5262BT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal equilibrium specification, AEC−Q101 qualification, Pb−free SOD−123 packaging, and junction temperature range (−55°C to +150°C).

Technical Context

This device operates as a two-terminal silicon Zener diode with sharp reverse breakdown at nominal 51 V under thermal equilibrium conditions (TL = 30°C ±1°C). It delivers stable regulation with 1100 Ω maximum Zener impedance at knee current (IZK = 2.5 mA) and maintains ≤0.1 μA reverse leakage at VR = 39 V.

The SOD−123 package supports automated assembly and provides 150°C/W junction-to-lead thermal resistance. Its cathode band marking and UL 94 V−0 flammability rating meet automotive PCB reliability requirements per AEC−Q101 stress testing protocols.

Key Specifications

Pinout & Package

SOD−123 surface-mount plastic package (1.60 × 2.69 × 1.16 mm), void-free thermosetting 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 MMSZ5262BT1G, SZMMSZ5262BT1G adds AEC−Q101 qualification and site-specific control for automotive programs, while SZBZX84C51LT1G trades power capability and thermal performance for smaller size - making SZMMSZ5262BT1G the sole option meeting both 500 mW and automotive reliability requirements.

Availability

SZMMSZ5262BT1G is available at Aetrix Electronics and suitable for automotive engine control, ADAS camera biasing, infotainment power protection, and electric power steering feedback requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SZMMSZ5262BT1G 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.

SZMMSZ5262BT1G belongs to the SZMMSZ52xxxT1G Zener regulator family, designed specifically for automotive-grade voltage reference and transient suppression in harsh-environment electronic control modules.

FAQ

What is the Zener voltage tolerance for SZMMSZ5262BT1G?

The SZMMSZ5262BT1G has a ±5% Zener voltage tolerance, meaning its nominal 51 V breakdown voltage falls between 48.45 V and 53.55 V when measured under thermal equilibrium conditions (TL = 30°C ±1°C). This tolerance is confirmed in the "5% TOLERANCE FG ELECTRICAL CHARACTERISTICS" table on page 3 of the official onsemi datasheet. The SZMMSZ5262BT1G is specified for use in applications where this level of voltage accuracy is sufficient for reference or clamping functions.

Is SZMMSZ5262BT1G qualified for automotive applications?

Yes, SZMMSZ5262BT1G is AEC−Q101 qualified and PPAP capable, as explicitly stated in the "Features" section of the onsemi datasheet. The "SZ" prefix denotes automotive and other applications requiring unique site and control change requirements. This qualification covers stress tests including high-temperature operating life, temperature cycling, and human-body-model ESD (>16 kV), making SZMMSZ5262BT1G suitable for under-hood and safety-critical automotive modules.

What is the maximum power dissipation of SZMMSZ5262BT1G and at what condition?

SZMMSZ5262BT1G is rated for 500 mW total power dissipation on an FR−5 board at lead temperature (T_L) = 75°C, with derating of 6.7 mW/°C above that temperature. This value is listed in the "MAXIMUM RATINGS" table on page 1 of the datasheet. The 500 mW rating reflects real-world board-level thermal performance-not just junction limits-and applies directly to SZMMSZ5262BT1G's SOD−123 package mounted on standard PCB material.

What package type does SZMMSZ5262BT1G use and what are its key mechanical features?

SZMMSZ5262BT1G uses the SOD−123 surface-mount plastic package (Case 425, Style 1), measuring 1.60 × 2.69 × 1.16 mm. Key mechanical features include void-free transfer-molded thermosetting plastic, corrosion-resistant solderable finish, UL 94 V−0 flammability rating, and cathode polarity indicated by a band. These attributes are documented in the "Mechanical Characteristics" section and mechanical outline drawing on page 6 of the datasheet.

How does the Zener impedance of SZMMSZ5262BT1G affect its regulation performance?

SZMMSZ5262BT1G has a maximum Zener impedance (Z_ZT) of 125 Ω at I_ZT = 2.5 mA, which directly determines how tightly it regulates voltage under varying load currents. Lower Z_ZT yields smaller output voltage deviations - for example, a 1 mA change in Zener current causes ≤125 mV shift in regulated voltage. This value is measured per industry-standard AC method (IZ(AC) = 0.1 IZ(DC), f = 1 kHz) and is critical for precision reference applications using SZMMSZ5262BT1G.