A characteristic zener diode for general purpose electronic circuits has the power rating of 500mW, BZX55 zener diode series or the larger 1.3W, BZX85 zener series are most commonly used zener diodes. Jul 8, 2006 #1 Hi all, I want to make a stable voltage reference, should I use LED or Zener diode? It compares open diode vs shorted diode and mentions difference between open diode and shorted or short diode failure conditions. LED vs Zener Diode. In fact, Zener diodes are never used for rectification purposes. A Zener diode is a silicon pn junction device that allows current to flow not only in the forward direction like a typical silicon or germanium diode, but also in the reverse direction if the voltage is greater than the breakdown voltage known as Zener knee voltage or simply Zener voltage, named after Clarence Melvin Zener, the discoverer of this electrical property. Hence, it has very thin depletion region. What’s the difference between them? The equation is V = IR. Content: Avalanche Vs Zener Breakdown. Zener vs Schottky vs Normal diode Diode is a semiconductor device with P-N junction. IN4728 zener diode has a breakdown voltage of 3.3 V. When reverses bias is occur and the input voltage is maximum AC at 5 Volts, then the value of the voltage across the IN4728 zener diode will remain at 3.3 V. Another special type of diode called the Avalanche diode is used for circuit protection. • Unlike normal diode, it is designed to operate in reverse biased region. Brian. Commonly, Zener diodes are available with breakdown voltage between 1.8 to 200 Volts. The Zener Diode is used in its “reverse bias” or reverse breakdown mode, i.e. For example: When using led's taking power from a standard rx, a resistor soldered to one leg of the led will reduce the voltage to the required level. Practical zener diodes may use either the zener effect or the avalanche effect and in some diodes both effects can also occur at the same time, but it is common practice to call all these diodes zener diodes. but regulator because of their feedback charecteristic fix the volatage( the tolerance even below .1%) and higher current they can support but more expensive than zener. Basically, in Switching diodes vs Rectifier diodes, the connections remain the same. A Zener Diode, also known as a breakdown diode, is a heavily doped semiconductor device that is designed to operate in the reverse direction. Both the zener and avalanche effects are also dependant to some degree on the junction temperature of the diode. Being Vs the regulator input voltage, Vo the output voltage, which will be equal to Vz, IL is the maximum load current and Iz the current or current through the Zener diode. When the jumping of electrons increases beyond the rated capacity of the diode, then avalanche breakdown occurs which breaks the junction. It is just the applications that differ. when you want a voltage around a fix voltage (for example you want 6.2 volt but can alter event to 6.8 ) and limited current Zener is good and chip. Zener Diode checking. Thread starter 8899; Start date Jul 8, 2006; Status Not open for further replies. I have seen the following symbols used to represent TVS diodes in circuit diagrams: simulate this circuit – Schematic created using CircuitLab. Zener diode is used as the voltage regulator. When the voltage across the terminals of a Zener diode is reversed and the potential reaches the Zener Voltage (knee voltage), the junction breaks down and the current flows in the reverse direction. We have discussed the application of Zener diode as voltage regulator and now we will discuss the other two points. Main Difference – Diode vs. Zener Diode. 8. 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