Schottky Diodes

Schottky diodes are a type of semiconductor diode that exhibit a lower forward voltage drop compared to conventional p-n junction diodes. They are named after the German physicist Walter H. Schottky, who first proposed the concept in 1938.

Definition:
A Schottky diode is a majority-carrier device that utilizes a metal-semiconductor junction, typically a metal-to-n-type semiconductor junction, to allow current flow in the forward direction. The diode's low forward voltage drop is due to the absence of a p-n junction, which results in faster switching speeds and lower power dissipation.

Function:
1. Rectification: Like all diodes, Schottky diodes allow current to flow in one direction while blocking it in the other, making them useful for converting alternating current (AC) to direct current (DC).
2. Clamping Voltage: They are used in voltage clamping applications to limit the voltage across a circuit to a specified level.
3. Switching: Due to their fast switching capabilities, Schottky diodes are employed in high-speed switching circuits.
4. Signal Detection: They can be used in radio frequency (RF) applications for signal detection and mixing.

Applications:
1. Power Supplies: In power conversion circuits, Schottky diodes are used for their low forward voltage drop, which improves efficiency.
2. Automotive Electronics: They are found in automotive systems for voltage regulation and protection.
3. Solar Panels: Schottky diodes are used in solar panel systems to prevent reverse current flow at night.
4. Electronic Devices: They are used in various electronic devices, such as computers, televisions, and smartphones, for voltage regulation and protection.

Selection Criteria:
1. Voltage Rating: Choose a diode with a voltage rating that exceeds the maximum reverse voltage expected in the application.
2. Current Rating: Ensure the diode can handle the maximum current that will flow through it in the forward direction.
3. Forward Voltage Drop: For power efficiency, select a diode with a low forward voltage drop.
4. Switching Speed: For high-speed applications, consider the diode's switching speed and recovery time.
5. Operating Temperature: Make sure the diode can operate within the temperature range of the application.
6. Package Type: Depending on the physical constraints of the application, choose a package that fits the space and mounting requirements.

In summary, Schottky diodes are valued for their low forward voltage drop and fast switching speeds, making them ideal for a variety of electronic applications where efficiency and speed are critical. When selecting a Schottky diode, it's important to consider its voltage and current ratings, forward voltage drop, switching speed, temperature range, and package type to ensure it meets the specific needs of the application.
Please refer to the product rule book for details.