Category: SEMICONDUCTOR DIODES

Zener Diodes Characteristics

Zener Diodes Characteristics: When a Junction diode is reverse biased, normally only a very small reverse saturation current flows; IS on the reverse characteristic in Fig. 2-25(a). When the reverse voltage is sufficiently increased, the junction breaks down and a large reverse current flows. If the reverse current is limited by means of a suitable […]

Testing of Semiconductor Diode

Testing of Semiconductor Diode: There are Several methods are available for Testing of Semiconductor Diode, namely, Ohmmeter Tests: One of the simplest and quickest tests can be made using an ohmmeter to measure the forward and reverse resistance of a diode, [see Fig. 2­22(a)]. The diode should offer a low resistance when forward biased, and a […]

Semiconductor Diode Specifications

Semiconductor Diode Specifications: Diode Data Sheets – To select a suitable diode for a particular application, the data sheets, or Semiconductor Diode Specifications, provided by device manufacturers must be consulted. Portions of typical diode data sheets are shown in Fig. 2-21 . Most data sheets start off with the device type number at the top […]

AC Equivalent Circuit of Semiconductor Diode

AC Equivalent Circuit of Semiconductor Diode: Junction Capacitances – The depletion region of a pn-junction is a layer depleted of charge carriers situated between two blocks of low resistance material. Because this is the description of a capacitor, the depletion region clearly has a capacitance. The depletion layer capacitance (Cpn) may be calculated from the equation […]

Temperature Effect on Semiconductor Diode

Temperature Effect on Semiconductor Diode: Diode Power Dissipation – The power dissipation in a diode is simply calculated as the device terminal voltage multiplied by the current level. Device manufacturers specify a maximum power dissipation for each type of diode. If the specified level is exceeded, the device will overheat and it may short-circuit or […]