Zener diode

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 16 August 18:48   A Zener diode is a blazon of diode that permits accepted to breeze in the advanced administration like a accustomed diode, but aswell in the about-face administration if the voltage is beyond than the rated breakdown voltage or Zener voltage.

    A accepted solid-state diode will not let cogent accepted breeze if reverse-biased beneath its about-face breakdown voltage. By beyond the about-face bent breakdown voltage, a accepted diode is accountable to top accepted breeze due to barrage breakdown. Unless this accepted is bound by alien circuitry, the diode will be assuredly damaged. In case of ample advanced bent (current breeze in the administration of the arrow), the diode exhibits a voltage bead due to centralized resistance. The bulk of the voltage bead depends on the architecture of the diode.

    A Zener diode exhibits about the aforementioned properties, except the accessory is abnormally advised so as to accept a abundantly bargain breakdown voltage, the alleged Zener voltage. A Zener diode contains a heavily benumbed p-n alliance acceptance electrons to adit from the valence bandage of the p-type actual to the advice bandage of the n-type material. A reverse-biased Zener diode will display a controlled breakdown and let the accepted breeze to accumulate the voltage beyond the Zener diode at the Zener voltage. For example, a diode with a Zener breakdown voltage of 3.2 V will display a voltage bead of 3.2 V if about-face biased. However, the accepted is not unlimited, so the Zener diode is about acclimated to accomplish a advertence voltage for an amplifier stage, or as a voltage balance for low-current applications.

    The breakdown voltage can be controlled absolutely accurately in the doping process. Tolerances to aural 0.05% are accessible admitting the alotof broadly acclimated tolerances are 5% and 10%.

    The aftereffect was apparent by the American physicist Clarence Melvin Zener.

    Another apparatus that produces a agnate aftereffect is the barrage aftereffect as in the barrage diode. The two types of diode are in actuality complete the aforementioned way and both furnishings are present in diodes of this type. In silicon diodes up to about 5.6 volts, the zener aftereffect is the absolute aftereffect and shows a apparent abrogating temperature coefficient. Aloft 5.6 volts, the barrage aftereffect becomes absolute and exhibits a absolute temperature coefficient.

    In a 5.6 V diode, the two furnishings action calm and their temperature coefficients neatly abolish anniversary additional out, appropriately the 5.6 V diode is the allotment of best in temperature analytical applications.

    Modern accomplishment techniques accept produced accessories with voltages lower than 5.6 V with negligible temperature coefficients, but as college voltage accessories are encountered, the temperature accessory rises dramatically. A 75 V diode has 10 times the accessory of a 12 V diode.

    All such diodes, behindhand of breakdown voltage, are usually marketed beneath the awning appellation of zener diode.



Tags: temperature, voltage, avalanche, effect, breakdown, direction

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