SML4746AHE3/5A

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The SML4746AHE3/5A is a single zener diode capable of providing regulation of voltages in a variety of applications. The component offers a 6.8V zener voltage with a 5 percent tolerance of accuracy.

The component features fast switching at high temperatures and an operating temperature range (-55°C to +150°C). It is also noted for its low reverse/leakage current and is available as a surface-mount device (SMD). It is made with glass passivation of the chip to protect the active element.

The component is constructed with a silicon glass die, which is filled with the nitrogen. The active device has a P-type body and an N-fluoro-boron-doped diffusion layer that interfaces the epi-layer, or substrate.

The component has two terminals, a cathode and an anode, that are configured differently depending on the application. The anode is the side connected to ground and the cathode is connected to the external source. Depending on the application, some designs require the cathode to be connected to the source, and the anode connected to ground.

The component is generally used to provide a specific voltage and limit current in voltage regulators and switching power supplies. It can also be used in series-regulating applications, such as TV and computer screens, where zener diodes act as an active element in the regulation process.

Working Principle: The SML4746AHE3/5A functions by creating a voltage drop between the anode and the cathode. This voltage drop is established and maintained across a region inside the diode known as the "zener breakdown region." When the voltage drop reaches a certain level, the diode will conduct a current. As the voltage decreases, the diode shuts off, protecting the connected components.

The zener breakdown region is created through a process called zener breakdown. In this process, a high electric field is created and maintained across a P-N junction due to the presence of highly doped impurity atoms in the semiconductor material. These impurity atoms act as a “trap” for the electrons, allowing them to flow in one direction despite the presence of an electric field blocking their normal diffusion.

Due to the voltage created between the source and the diode, the electrons in the P-N junction are trapped and generate a current. This current is maintained until the voltage drop reaches a certain level, creating a stable voltage across the P-N junction. This stable voltage is the desired zener voltage, which is usually indicated in the specifications of the component.

Advantages: The SML4746AHE3/5A provides a multitude of advantages due to its low thermal resistance, wide temperature range, and fast switching speed. It offers greater stability over time and is extremely efficient at providing regulation. The device is also RoHS compliant, making it suitable for use in a variety of applications.

Applications: The SML4746AHE3/5A is commonly used in voltage regulators, switching power supplies, series-regulating applications, and more. It can be used in a variety of systems, including computers, TVs, gaming systems, and handheld devices.

In summary, the SML4746AHE3/5A is a single zener diode capable of providing regulation of voltages in a variety of applications. The component offers a 6.8V zener voltage with a 5 percent tolerance of accuracy. It also offers fast switching at high temperatures, a wide temperature range, and low reverse/leakage currents. It is commonly used in voltage regulators, switching power supplies, series-regulating applications, and other systems.

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