Alloy diode on a single chip N-type germanium or silicon PN junction is formed by adding the production of indium alloy, aluminum and other metal approach. Forward voltage drop is small, suitable for high current rectification. PN junction reverse its large capacitance, therefore suitable for the detection of high-frequency and high-frequency rectification. Diffusion type diode P-type impurity gas temperature, the heating unit N-type germanium or silicon wafer, so that a single wafer surface into the P-type, this method PN junction. Because PN junction forward voltage drop is small, suitable for high current rectification. Recently, the use of high-current rectifiers mainstream has been transferred to the silicon-silicon alloy type diffusion. Production methods mesa type diode PN junction diffusion although the same, but only keep the PN junction and the necessary parts, switching diodes, the unnecessary portions etched away using drugs. The remaining part will be presented mesa shape, hence the name. Initial production of the mesa type semiconductor material is made of using a diffusion method. So, again this mesa called diffusion mesa. For this type, the two-way trigger diode, high current rectification seems to be little product models, and low current switching product model, but a lot. Varactor (Varactor Diodes) as a special diode. When the applied forward bias voltage, a large current is generated, PN (positive and negative) junction depletion region is narrowed, the capacitance increases, resulting in diffusion capacitance effect; when the reverse bias voltage is applied, will give a transition capacitance effect . But when applied forward bias leakage current will be generated, the diode, so the applications are supplied to a reverse bias voltage. Also known as varactor diodes varicap, based on changes in the voltage provided to the semiconductor junction capacitance changes. That is, as a variable capacitor, can be applied to the FM tuner and TV tuner resonant circuit and the FM modulation circuit. Two positive and negative terminals of the diode. A positive terminal called the anode, the negative terminal K; called the cathode. Current can only move from the anode to the cathode direction. Some beginners prone to such a misconception: "semiconductors a 'half' is half the 'half'; and the diode is only a 'half' current flow (which is wrong), all the diode is a semiconductor;." In fact, the semiconductor diode is something completely different. We can only say that the diode is a semiconductor device is formed. Semiconductor whichever direction the current can flow. Diodes, gold honesty, patch diode provided by Qingdao integrity Technology Co., Ltd. Diodes, gold honesty, SMD diode is Qingdao integrity Technology Co., Ltd. (www.qdjcx.com) this year introduced a new upgrade, the above picture is for reference only, please call the telephone or pictures on this page, for the latest Information, Contact: Mr. Yang.