Constant-current diode

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Constant-current diode (also called CLD, current-limiting diode, diode-connected transistor or CRD, current-regulating diode) consists of a JFET with the gate shorted to the source, and it functions like a two-terminal current limiter or current source (analogous to a voltage-limiting Zener diode). They allow a current through them to rise to a certain value, and then level off at a specific value. Unlike Zener diodes, these diodes keep the current constant instead of the voltage constant. These devices keep the current flowing through them unchanged when the voltage changes. An example is the 1N5312.

Note the negative VGS is required, as an example on the n-type junction-gate field-effect transistor 2N5457

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