Up to this point, we have not taken full advantage of the reverse biased part of the diode characteristic. Here you will learn, how the zener diode is used in reverse. Hbd854 zener theory and design considerations handbook. Basic electronics notes on vi characteristics of zener. In reverse bias, a negligible constant current flow through the zener diode but the current becomes abruptly large at certain voltage. A semiconductor diodes currentvoltage characteristic can be tailored by selecting.
But for simplicity, both types are called zener diodes. Vi characteristics of zener diode vi characteristics of. Currentvoltage characteristic of a zener diode with a breakdown voltage of 3. Stmicroelectronics nv and its subsidiaries st reserve the. Zener diode definition a zener diode is a type of diode that permits current to flow in the forward direction like a normal diode, but also in the reverse direction if the voltage is larger than the breakdown voltage known as zener knee voltage or zener voltage. The vi characteristic of zener diode indicates that characteristic of zener diode in forward bias is same as pn junction diode. But due to higher doping concentration, higher current flows through the zener diode. Electronics world 1968 08 fingerprint microphone scribd. The breakdown voltage of a zener diode can be set by controlling the doping level.
Observation of characteristics of a zener diode debangshu mukherjee bs. Zener diode working with circuit diagram and applications. Lm7805 431 regulator lm7805 to92 package application notes on lm7805 431 marking lm7805 05 1r1 marking vs 431 datasheet lm7805 text. When a forward voltage is applied, current flows through it. The symbol of zener diode is similar to the normal pn junction diode, but with bend edges on the vertical bar. Zener diode is nothing but a single diode connected in a reverse bias mode and zener diode can be connected in reverse bias positive in a circuit as shown as picture. A zener diode is a type of diode that allows current to flow in the conventional manner from its. Electrical characteristics tamb 25 c, unless otherwise specified part number zener voltage range 1 test current reverse leakage dynamic resistance f 1 khz surge current 3 regulator 2. The active portion of a zener diode is a semiconductor pn junction. Basics currentvoltage characteristic of a zener diode with a breakdown voltage of 17 volt. This post includes explanation of operation of zener diode and vi characteristics of zener diode. For example, diodes are used to regulate voltage zener diodes, to protect circuits. The circuit symbol of zener diode is as shown in the figure. A diode is a twoterminal electronic component that conducts current primarily in one direction.
1093 424 292 308 63 1534 717 701 1097 177 1450 903 131 854 1290 944 675 87 1221 1584 1627 1286 1387 816 751 841 1357 1436 1087 1222 1208 877 697 726 918