Method for detecting the quality of diodes:

1. Detection of ordinary diodes: (including detector diodes, rectifier diodes, damping diodes, switching diodes, and freewheeling diodes) is a semiconductor device composed of a PN structure with unidirectional conductivity characteristics. By using a multimeter to detect its forward and reverse resistance values, the electrode of the diode can be identified, and it can also be estimated whether the diode is damaged.

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2. Detection of zener diode: Connect the positive terminal of the megohmmeter to the negative terminal of the zener diode, and connect the negative terminal of the megohmmeter to the positive terminal of the zener diode. Shake the handle of the megohmmeter at a constant speed according to regulations, and monitor the voltage values at both ends of the zener diode with a multimeter (the voltage range of the multimeter should depend on the size of the stable voltage value). When the voltage indication on the multimeter is stable, This voltage value is the stable voltage value of the zener diode. If the stable voltage value of the zener diode is measured to fluctuate, it indicates that the diode is unstable.

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1. Definition and classification of semiconductor diodes

A semiconductor diode is a unidirectional conductive two-terminal device made of semiconductor materials. It is widely used in rectification scenarios because of its characteristic that only allows current to flow in a single direction. It is one of the most commonly used electronic components. The semiconductor diode is one of the earliest discrete semiconductor devices. It can be connected to a variety of components such as resistors, capacitors, and inductors in a reasonable combination to form circuits with different functions. These circuits can achieve various functions such as rectification of alternating current, wave building, amplitude limiting, clamping, and voltage stabilization of the modulated signal.

According to specific uses, diodes can be divided into detection diodes, rectifier diodes, Zener diodes, switching diodes, isolation diodes, Schottky diodes, light emitting diodes, silicon power switching diodes, rotating diodes, etc. Among them, rectifier diodes, detector diodes, switching diodes, and Zener diodes are widely used.

2. Industry chain analysis of China's semiconductor diode industry

Participants in the upstream market of China's semiconductor diode industry chain include industrial silicon, packaging materials and other raw material suppliers and production equipment suppliers. The midstream of the industry chain is a Chinese semiconductor diode manufacturer. The downstream terminal application areas of the industry chain cover consumer electronics such as mobile phones, computers, and home appliances. And automobiles and other fields.

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