Discrete device refers to the electronic device with a single function and the function can not be split, according to the chip structure and function can be divided into semiconductor diode, transistor, bridge rectifier, photoelectric device and so on. Semiconductor discrete devices are mainly composed of chip, lead\/frame, plastic shell several parts, in which the chip determines the function of the device, such as rectifier, voltage regulation, switch, protection, etc., the lead\/frame to achieve the chip and the external circuit connection and heat export, plastic shell for the chip and internal structure to provide protection, to ensure the stable realization of its function. And is highly related to core performance such as heat dissipation.
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Discrete device chips differ from integrated circuit chips commonly understood by the semiconductor industry. The basic unit of semiconductor circuit function realization is the PN junction composed of semiconductor materials, and the PN junction and its formed graphics are engraved on a small piece of silicon in a certain way to form a semiconductor chip. Among them, the discrete device (diode, transistor, etc.) chip refers to a chip that forms only one or a small amount of PN junction on a silicon chip through doping, diffusion and other processes, and its chip has a simple structure and relatively simple function, mainly to achieve the established circuit functions of rectification, voltage regulation, switching, amplification and so on. The integrated circuit chip is a special semiconductor process to tens of thousands of PN junction, capacitor, resistor, wire, etc. formed with a specific function of the graphics engraved on a small piece of silicon chip to form a chip, so the integrated circuit chip structure is very complex, can achieve digital signals, analog signals processing and conversion and other complex functions.
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Although the integration of the chip brings the advantages of small size, light weight and high reliability, for some specific functions that are difficult to integrate, such as high-speed switching, voltage regulation protection, transient suppression and high current, high voltage, low power and other performance requirements, as well as for line structure, integration difficulty and cost, stability and other aspects of consideration, still need to use a large number of discrete devices to complete. Therefore, the use of discrete devices and integrated circuits has become the norm in the semiconductor industry. I hope this answer is helpful to you