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A Zener diode is a semiconductor diode that becomes strongly conductive for voltages above a given value, called the diode's Zener voltage. The Zener voltage applies to the blocking direction of the diode. In the conduction direction, the Zener diode behaves like a normal semiconductor diode. The Zener diodes are mainly characterized by the magnitude of the breakdown voltage (Zener voltage, breakthrough voltage). There are two different physical phenomena that lead to the stress limitation of the blocking direction. The actual Zener effect applies to voltages below 5-6 volts. For higher voltages, due to voltage limit the so-called "avalanche breakdown” occurs. The Zener effect has a negative temperature coefficient and the avalanche breakdown a positive one. For Zener diodes where the Zener voltage is set to about 5.6 volts, both effects work simultaneously and such diodes, therefore, exhibit fairly temperature-stable voltages. Most small signal bipolar transistors have a usable good Zener diode in the range 5–6 volts for the BE diode. If you’re looking for a high-quality Zener diode, check Botland.store offer.
