Constant-current diode: Difference between revisions

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Latest revision as of 18:50, 10 October 2024

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[[File:Current limiting diode symbol.svg|thumb|80px|Electric symbol]]

A '''Constantconstant-current diode''' is an electronic device that limits current to a maximal specified value for the device. It is known as a '''current-limiting diode''' ('''CLD'''), or '''current-regulating diode''' ('''CRD''').

[[File:Current limiting diode - internal structure.svg|thumb|150px|Internal structure]]

TheseIt diodes consistconsists of an n-channel [[JFET]] with the gate shorted to the source, which functions like a two-terminal current limiter or [[current source]] (analogous to a voltage-limiting [[Zener diode]]). It They allowallows a current through themit to rise to a certain value, andbut 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 voltagenot changeshigher.

Note that some devices are unidirectional and voltage across the device must have only one polarity for it to operate as a CLD, whereas other devices are bidirectional and can operate properly inwith either polarity.

[[Wide-bandgap semiconductor|Wide-bandgap materials]] such as [[silicon carbide]] have been used in production devices to enable high-voltage applications in the kilovolt range.<ref>{{cite web |title=CALY Technologies SiC CLD devices |url=https://caly-technologies.com/sic-products/sic-protection-devices/sic-current-limiting-devices-cld |website=[[CALY Technologies]] |accessdateaccess-date=26 April 2020}}</ref>

== References ==

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* [https://web.archive.org/web/20190225201135/http://www.mccsemi.com/up_pdf/CLD20B(DO-214AA).pdf CLD diode datasheet], MCC

* [http://www.atcsemitec.co.uk/pdfdocs/Semitec-CRDs.pdf CRD diode datasheet], Semitec

* [httphttps://www.linearsystems.com/lsdata_files/datasheetsugd/J500_J501_J502_J503_J504_J505_J506_J507_J508_J509_J510_J511_Current_Regulator_Diode7e8069_39116d53e0544ba89382a8ea395563c6.pdf J500 diode datasheet], Linear Systems / [[Siliconix]] / [[Vishay]]

* [http://centralsemi.com/PDFs/products/1N5283-5314.pdf 1N5283 to 1N5314 diode datasheet], Central Semiconductor

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[[Category:Diodes]]

[[Category:Over-current protection devices]]

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