Diodes are normally used for rectification, whereas zener diodes are used for voltage regulation. ![]() Amount of doping for P and N semiconductor layers are different in the two devices.Ĥ. A normal diode will be permanently damaged for a large reverse current, but a zener diode will not.ģ. Diode can conduct current only in one direction, whereas zener diode allows the conduction in both directions.Ģ. If the anode to cathode voltage is higher than forward voltage drop (about 0.7V), it will conduct in forward direction, and it will conduct in reverse direction, if the reverse voltage is equal to zenor voltage (may be any value ex: -12V or -70V).ġ. Therefore, zenor diode can conduct in both ways. This is achieved by changing the way of doping the PN junction and this reverse voltage is called the ‘Zener voltage’. Zener diode will also conduct a large reverse current, but the device will not be damaged. As mentioned in previous paragraph, a normal diode will conduct a large reverse current and becomes permanently damaged when a large reverse voltage is applied. Zener diode is made by doing a little adjustment to a normal diode. In this case, diode is damaged permanently (due to avalanche breakdown) and becomes a conductor allowing a huge cathode to anode current. This voltage is usually about 0.7V for normal silicon diodes.Īlthough, diode allows current flows from anode to cathode, things change when a very large voltage (called breakdown voltage) is applied in the direction of cathode to anode (N to P). This voltage drop (known as the forward voltage drop) is always there when a current flow happens. The diode starts acting as a conductor when a small voltage is applied in the direction of anode to cathode. The full bridge rectifier circuit, which is made of four diodes can rectify an alternative current (AC) to a direct current (DC). Since diode restricts the current to only one direction, it can be used as a rectifier. Another way to tell which lead is the anode and which is the cathode is to look at the two plates at the end of the leads inside the body of the LED. The cathode is marked on the rim of the LED body with a flat area shown in the diagram. This direction of current is marked on its symbol with an arrow head. On the physical LED, the longer lead (or leg) of the LED is the anode. Diode has two terminals known as the anode (the P-type layer) and cathode (the N-type layer).ĭiode allows current to flow through it, only in one direction that is anode to cathode. ![]() Designers select them according the requirement of the application.ĭiode is the simplest semiconductor device and it consists of two semiconductor layers (one P-type and one N-type) connected to each other. Zener diode is a special type of diode, which possesses some other features that cannot be found in normal diodes. The MAX6952 can drive either four monocolor digits (Table 1) or two bicolor digits (Table 2). Detailed Description The MAX6952 is a serially interfaced display driver that can drive four digits of 5 7 cathode-row dot-matrix displays. Diode is a semiconductor device, which consists of two semiconductor layers. ANODE (PIN O14) MAX6952 toc06 GROUND FOR CATHODE (PIN O3) 220m s/div.
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