onsemi SZMMSZ4V7T1G

Overview

SZMMSZ4V7T1G from onsemi is a 4.7 V ±5% Zener voltage regulator diode in SOD−123 surface-mount package, rated for 500 mW power dissipation at 75°C, with 80 Ω maximum dynamic impedance at 5 mA test current and 3 µA maximum reverse leakage at 2 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog and power management circuits.

For engineers reviewing the SZMMSZ4V7T1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener tolerance (±5%), thermal resistance (340°C/W), AEC−Q101 qualification, ESD rating (>16 kV HBM), and SOD−123 board assembly compatibility.

Technical Context

This device operates in reverse breakdown to maintain stable voltage across its terminals under varying load and temperature conditions. Its 4.7 V nominal Zener voltage is specified at IZT = 5 mA, with temperature coefficient near zero (≈0.2 mV/°C) per typical characterization data for this voltage range.

The SOD−123 package enables high-density PCB layout while supporting automated placement and reflow soldering. Thermal performance is defined by junction-to-ambient resistance of 340°C/W and junction-to-lead resistance of 150°C/W, enabling reliable operation from −55°C to +150°C.

Key Specifications

Pinout & Package

SOD−123 surface-mount plastic package (Case 425, Style 1), 1.60 × 2.69 × 1.16 mm, cathode indicated by polarity band. Maximum soldering temperature: 260°C for 10 seconds.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C4V7 and MMSZ4V7ET1G, SZMMSZ4V7T1G uniquely combines automotive qualification, superior thermal performance in SOD−123, and full production traceability-making it the preferred choice for safety-critical or long-lifecycle industrial and automotive systems.

Availability

SZMMSZ4V7T1G is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, and medical diagnostic equipment requiring stable component supply, long-term lifecycle assurance, and AEC−Q101-compliant sourcing.

Supply support for SZMMSZ4V7T1G 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.

SZMMSZ4V7T1G belongs to the AEC−Q101-qualified MMSZxxxT1G family, designed specifically for automotive and industrial voltage regulation where reliability, thermal stability, and ESD robustness are critical.

FAQ

What is the Zener voltage tolerance of SZMMSZ4V7T1G?

The SZMMSZ4V7T1G has a nominal Zener voltage of 4.7 V with a tolerance of ±5%, meaning the actual measured voltage falls between 4.47 V and 4.94 V when tested at I_ZT = 5 mA and T_A = 25°C. This tolerance is guaranteed across the full operating temperature range and is consistent with AEC−Q101 qualification requirements for automotive applications.

Is SZMMSZ4V7T1G qualified for automotive use?

Yes, SZMMSZ4V7T1G is AEC−Q101 qualified and PPAP capable. The "SZ" prefix explicitly indicates compliance with automotive quality standards, including stress testing for temperature cycling, humidity, mechanical shock, and ESD. It is approved for use in body electronics, infotainment, and ADAS subsystems where long-term reliability is mandated.

What is the maximum power dissipation for SZMMSZ4V7T1G on a standard PCB?

SZMMSZ4V7T1G is rated for 500 mW total power dissipation on an FR−5 board at lead temperature (T_L) = 75°C. Above 75°C, it derates linearly at 6.7 mW/°C. At 100°C lead temperature, the usable power drops to 332.5 mW. This rating assumes proper copper pour and thermal relief design per onsemi's recommended layout guidelines.

How does the temperature coefficient affect SZMMSZ4V7T1G performance?

SZMMSZ4V7T1G exhibits a near-zero temperature coefficient (~0.2 mV/°C) around 4.7 V, as confirmed by onsemi's typical characteristics curves. This results in minimal Zener voltage drift over temperature - less than ±10 mV from −40°C to +125°C - making it ideal for precision reference applications where thermal stability is essential.

What packaging options are available for SZMMSZ4V7T1G?

SZMMSZ4V7T1G is supplied in Pb−free SOD−123 package (Case 425, Style 1) on 3,000-unit tape-and-reel (T1G suffix). The marking "U3" appears on the cathode end, and the "G" suffix confirms RoHS compliance. No alternate packages (e.g., SOT−23 or DO−35) are offered for this specific part number.