In the electronic circuit, the cathode of the diode is connected to the low potential end, the cathode is connected to the high potential end, at this time the diode has almost no current flowing through, the diode is in the cut-off state, this connection mode, called the reverse bias. When the diode is in reverse bias, there is still a faint reverse current flowing through the diode, known as the leakage current. When the diode at both ends of the reverse voltage increase to a certain value, the reverse current will increase sharply, the diode will lose the single direction of conductive characteristics, which is called the breakdown of the diode.
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