current regulative diode (CRD)
As the name current limiting diodes (CRD) already indicates, these are special diodes that limit the current at a certain current intensity. Their characteristic curve shows a straight course from a certain point. The current is constant from a certain voltage and then does not increase any further even if the voltage continues to rise.
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Current limiting diodes are used, among other things, in constant current sources and ensure a constant current over a wide voltage range.