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How to choose the type of diode in a short time
Publish：SHENZHEN ENXIC ELECTRONICS CO., LTD,Schottky diodes, rectifier diodes, fast recovery diodes, switching transistors, thermistors, MOS tube, TVS tube, Youze Electronics Time：2017-12-18 Views:872
Semiconductor voltage regulator diode is also called zener diode (ZenerDiode) or voltage regulation diode. Voltage diode is divided into two kinds of low voltage and high pressure. The Vz value of low voltage diode is below 40V, and the high voltage diode is up to 200V. And Bose sealed voltage diode, its advantages are complete specifications (Vz=2.4 to 200V), good voltage stability, small volume (using DO-35 package, diameter of 2.0mm, long 4mm), low price.
Selection of voltage stabilizer diode
For a steady voltage diode, when the reverse voltage exceeds its working voltage Vz (also called zener voltage or stable voltage), the reverse current will increase suddenly, and the voltage at both ends of the device is kept constant. The corresponding reverse volt ampere characteristic curve is very steep, and the dynamic resistance is very small. The voltage regulator diode is usually used as a reference voltage source in a regulated power supply, or as a protective diode in overvoltage protection circuit.
The voltage regulator diode should meet the requirements of the main parameters in the application circuit. The stable voltage of the voltage regulator should be the same as the reference voltage of the applied circuit. The maximum stable current of the voltage regulator diode should be higher than 50% of the maximum load current of the application circuit.
After the diode is damaged, we should use the same type diode or the same voltage regulator diode to replace it. The high dissipative power regulated diode with the same stable voltage value can be used to replace the low power diode with low dissipative power, but it can not be used to replace the high dissipation power diode with low power dissipation diode. For example, the zener diodes of 0.5W and 6.2V can be replaced by 1W and 6.2V voltage stabilizing diodes.
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