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What are the integration technologies for high-power LED multi-function packages? Diode, (English: Diode), among electronic components, a device with two electrodes that only allows current to flow in a single direction, and many uses the function of rectification. The varactor diode (Varicap Diode) is used as an electronically tunable capacitor. The current directionality of most diodes is often referred to as the "Rectifying" function. The most common function of a diode is to allow only current to pass in a single direction (called forward bias) and reverse in reverse (called reverse bias). Therefore, the diode can be thought of as an electronic version of the check valve.