The MM3Z3V9ST1G is a precision Zener diode manufactured by AMI Semiconductor/onsemi, designed specifically for voltage regulation and reference applications in compact electronic systems. This discrete semiconductor component belongs to the single Zener diode category and addresses critical design challenges in modern electronics where space constraints, thermal management, and precise voltage regulation are paramount concerns.
This surface-mount device features a nominal Zener voltage of 3.9V with a tight ±2% tolerance, making it ideal for applications requiring stable voltage references. The component is housed in the ultra-compact SOD-323 (SC-76) package, which measures significantly smaller than traditional through-hole alternatives, enabling designers to maximize board density while maintaining reliable performance. The package design facilitates automated assembly processes and provides excellent thermal characteristics for its size class.
The diode operates across an extended temperature range from -65°C to 150°C junction temperature, ensuring reliable operation in harsh environmental conditions including automotive, industrial, and aerospace applications. With a maximum power dissipation of 300mW, this component can handle substantial current loads while maintaining voltage regulation stability. The forward voltage drop is specified at a maximum of 900mV at 10mA forward current, while reverse leakage current remains minimal at 3µA at 1V reverse bias, contributing to overall system efficiency.
Key electrical specifications include a maximum impedance of 90 ohms at the Zener knee, which ensures sharp voltage regulation characteristics and minimal voltage variation under varying load conditions. The device demonstrates excellent dynamic resistance properties, making it suitable for precision reference circuits, voltage monitoring applications, and overvoltage protection schemes.
This Zener diode finds extensive application in power supply regulation circuits, battery management systems, automotive electronics, consumer electronics, telecommunications equipment, and industrial control systems. Its compact form factor makes it particularly valuable in portable devices, IoT sensors, and space-constrained PCB layouts where traditional larger components cannot be accommodated.
The MM3Z3V9ST1G is fully RoHS3 compliant, meeting current environmental regulations for lead-free manufacturing processes. The component is supplied in tape and reel packaging format, facilitating high-volume automated assembly operations and ensuring proper component orientation during pick-and-place operations.
Regarding equivalent and alternative models, several manufacturers offer comparable 3.9V Zener diodes in SOD-323 packaging. Direct equivalents include the Vishay MMSZ5229B-TP, Nexperia BZX384-C3V9, Rohm DZ2J039M0L, Diodes Incorporated MMSZ5229B-7-F, Central Semiconductor CMMZ5229B-TP, and Micro Commercial Components MMSZ5229B-TP. Additionally, the Bourns CD0603-S01575 and Littelfuse SP1003-01WTG offer similar functionality with slight variations in packaging or electrical characteristics. When considering alternatives, designers should verify that replacement components meet identical voltage tolerance, power rating, and temperature coefficient requirements, as these parameters can significantly impact circuit performance. The base product number MM3Z3 indicates this is part of a broader series, with other voltage variants available including 2.4V, 2.7V, 3.0V, 3.3V, 4.3V, 4.7V, 5.1V, and higher voltages up to 75V, all maintaining similar package and power characteristics while offering different Zener voltage options for various application requirements.
MM3Z3V9ST1G Key Technical Attributes
Manufacturer: AMI Semiconductor/onsemi
Model: MM3Z3V9ST1G
Category: Discrete Semiconductor, Zener Diode
MM3Z3V9ST1G Packing Size
The MM3Z3V9ST1G Zener diode is packaged in a compact SOD-323 (SC-76) case, making it suitable for high-density surface mount assembly. The SOD-323 package is constructed of high-quality plastic material, ensuring robust protection and reliability. This package offers a small footprint, which is ideal for space-sensitive designs. Standard tape and reel (TR) packaging is used, which supports automated pick-and-place assembly and efficient mass production.
MM3Z3V9ST1G Application
This 3.9V Zener diode is widely used for voltage regulation, surge suppression, and overvoltage protection in various electronic circuits. It is particularly suitable for portable devices, communication equipment, power management systems, consumer electronics, and automotive applications where board space is limited and stable reference voltage is required. The broad operating temperature range from -65°C to 150°C (TJ) ensures excellent reliability across demanding environments, making it an optimal choice for both commercial and industrial designs.
MM3Z3V9ST1G Features
MM3Z3V9ST1G offers a nominal Zener voltage (Vz) of 3.9V with a strict ±2% tolerance, ensuring accurate and stable voltage regulation in application circuits. It supports a maximum power dissipation of 300mW, helping to maintain consistent performance under moderate load conditions. The diode boasts a forward voltage (Vf) of 900 mV at 10 mA, and a reverse leakage current of 3 µA at 1V, contributing to its energy-efficient operation. Its SOD-323 surface-mount construction allows for increased design flexibility and efficient use of PCB area. With a maximum impedance (Zzt) of 90 ohms, this Zener diode guarantees minimal dynamic resistance, making it highly effective for sharp voltage clamping and noise suppression. Additionally, the product is compliant with RoHS3 environmental standards, ensuring it is free from hazardous substances and suitable for eco-conscious design requirements.
MM3Z3V9ST1G Quality and Safety Features
This product adheres to RoHS3 compliance, confirming that it does not contain hazardous materials and aligns with global environmental safety directives. Its operation is rated from -65°C to 150°C junction temperature, providing robust thermal stability and safety even in environments with extreme temperature fluctuations. The tight voltage tolerance and low leakage characteristics contribute to high circuit protection reliability, minimizing the risk of device malfunction in end-user applications.
MM3Z3V9ST1G Compatibility
The MM3Z3V9ST1G Zener diode is compatible with industry standard SOD-323 footprints, ensuring seamless integration in most modern PCBs. It supports automated placement and soldering processes and matches the requirements of most tape and reel manufacturing setups. This compatibility ensures easy replacement, design flexibility, and broad system applicability.
MM3Z3V9ST1G Datasheet PDF
For design engineers and procurement specialists, our website provides the most authoritative and comprehensive datasheet for the MM3Z3V9ST1G model. We strongly recommend downloading the datasheet directly from this page to gain access to the latest specifications, application guidelines, and reliability data for your project.
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