Patch diode, also known as crystal diode, referred to as diode , there are early vacuum electronic diodes; it is a kind of electronic device with unidirectional conduction current. Inside the semiconductor diode, there is a PN junction and two lead terminals. This kind of electronic device has the conductivity of unidirectional current according to the direction of applied voltage. Generally speaking, the patch crystal diode is a pmurn junction interface composed of p-type semiconductors and n-type semiconductors. A space charge layer is formed on both sides of the interface to form a self-built electric field. When the applied voltage is equal to 00:00, the dispersed current and the drift current caused by the self-built electric field are in electrical equilibrium because the carrier concentration difference on both sides of the pmurn junction is equal to the drift current caused by the self-built electric field. This is also the normal characteristic of the diode.
Chip diode tube voltage drop: Silicon diode (non-light-emitting type) forward tube voltage drop 0.7V, germanium tube forward tube voltage drop to 0.3V, LED forward tube voltage drop will vary with different light-emitting colors. There are three main colors, and the detailed voltage drop reference values are as follows: the voltage drop of the red LED is 2.0murmur2.2V, the voltage drop of the yellow LED is 1.8V-2.0V, the voltage drop of the green LED is 3.0V-3.2V, and the rated current during normal light emitting is about 20mA. The voltage and current of the patch diodes are not linear, so it is necessary to connect the corresponding resistors when the different patch diodes are connected in parallel. Chip diode characteristics next to the chip diode, electronic components, a device with two electrodes that only allows current to flow in a single direction. Many uses use its rectification function. The varactor (Varicap Diode) is used as an electronic adjustable capacitor.
贴片二极管的管压降:硅二极管(不发光类型)正向管压降0.7V，锗管正向管压降为0.3V，发光二极管正向管压降会随不一样发光色彩而不一样。主要有三种色彩，详细压降参考值如下:赤色发光二极管的压降为2.0--2.2V，黄色发光二极管的压降为1.8-2.0V，绿色发光二极管的压降为3.0-3.2V，正常发光时的额定电流约为20mA。贴片二极管的电压与电流不是线性关系，所以在将不一样的贴片二极管并联的时候要接相适应的电阻。 贴片二极管特性 贴片二极管，电子元件旁边，一种具有两个电极的设备，只允许电流由单一方向流过。许多的使用是使用其整流的功用。而变容二极管(Varicap Diode)则用来当作电子式的可调电容器。