The Schottky diode is a diode with low power consumption, ultra-high speed, and short reverse recovery time. Therefore, Schottky diodes have many uses, such as high frequency, low voltage, high current rectifier diodes, freewheeling diodes, protection diodes, rectifier diodes, small signal detection diodes, etc. In microwave communications and other circuits. Generally speaking, Schottky diodes are often used in communication power supplies, inverters, etc. Commonly used packaging forms are: TO-220AB, ITO-220AB, TO-247. There are many types of chip Schottky diodes named after SS.
Schottky diodes usually have low withstand voltage, but have a fast recovery speed and can be used in high frequency applications. Therefore, the switching power supply uses a diode as a rectifier output. However, the temperature of the rectifier tube on the switching power supply is still very high. The characteristics of the Schottky barrier make the on-voltage drop of the Schottky diode lower, which can increase the switching speed. Schottky diodes are roughly divided into two types of packages according to the current limit they are subject to. Small current type (such as SS14 and SS24), high current type (such as MBR20100CT and MBR10100FCT) are packaged in TO-220AB and ITO-220AB.
The structure and characteristics of Schottky diodes (low starting voltage and small charge storage effect) make it suitable for high frequency rectification in low voltage and large current output situations. Schottky diodes are also often used in many integrated circuit products, and are widely used in various electronic products. Schottky diodes are not made using the principle of forming a PN junction with a P-type semiconductor and an N-type semiconductor contacting, but using the principle of forming a metal-semiconductor junction with a metal-semiconductor contact. Therefore, the Schottky diode is also called a metal semiconductor (contact) diode or a surface barrier diode, which is a hot carrier diode.
The frame and pins for Schottky diodes are forged with seamless welding technology. The material is high-purity oxygen-free copper, which has bending resistance, oxidation resistance and high conductivity. The encapsulation adopts imported epoxy resin, which has better encapsulation and flame retardant performance. Screen printing uses laser marking, never fades, is efficient and environmentally friendly, and reduces production costs to a certain extent.
The function of the Schottky diode is mainly reflected in the switching circuit of the bipolar transistor BJT. By connecting the Shockley diode to the BJT to clamp, the transistor is actually in a very closed state when the transistor is turned on, thereby improving the switching of the transistor. speed. This method is used in the TTL internal circuits of typical digital integrated circuits such as 74LS, 74ALS and 74AS.