SMD diode tube voltage drop: silicon diode (non-luminous type) forward tube voltage drop is 0.7V, germanium tube forward tube voltage drop is 0.3V, light-emitting diode forward tube voltage drop will vary with different light-emitting colors. There are mainly three colors. The specific voltage drop reference values are as follows: the voltage drop of the red light-emitting diode is 2.0-2.2V, the voltage drop of the yellow light-emitting diode is 1.8-2.0V, and the voltage drop of the green light-emitting diode is 3.0-3.2V, normal The rated current when emitting light is about 20mA. The voltage and current of the SMD diode are not linear, so when connecting different SMD diodes in parallel, an appropriate resistance should be connected. SMD diode characteristics  SMD diode (English: Diode), among electronic components, is a device with two electrodes that only allows current to flow in a single direction. Many uses are to apply its rectification function. The varicap diode (Varicap Diode) is used as an electronic adjustable capacitor.