Special Diode Characteristics SJ261

Item Code: SJ261

Principle and Working:

MOSFET: A MOSFET is a four-terminal device having source(S), gate (G), drain (D) and body (B) terminals. In general, The body of the MOSFET is in connection with the source terminal thus forming a three-terminal device such as a field-effect transistor. MOSFET is generally considered as a transistor and employed in both the analog and digital circuits.the functionality of MOSFET depends on the electrical variations happening in the channel width along with the flow of carriers (either holes or electrons). The charge carriers enter into the channel through the source terminal and exit via the drain.
... SCR: An SCR is a three-terminal, three-junction, and four-layer semiconductor device that is used to perform switching functions in power circuits. Sometimes the SCR is also called as Thyristor. The SCR has three pn – junctions, and four layer of p and n type semiconductor joined alternatively to get pnpn device. The three terminals are taken – one from outer p – type layer called anode (A), second from the outer n – type layer called cathode (K) and the third from the internal p –type layer called gate (G).In a SCR, the load is connected in series with the anode. The anode is always kept positive with respect to cathode.
TRIAC: TRIAC is an acronym that stands for “Triode for Alternating Current” Triode means a three-terminal device while AC means that it is used for switching Alternating current. It is a three-terminal bi-directional switch that conducts in both directions. It is made from the combination of two SCRs in anti-parallel with their gates joined together. TRIAC can be triggered into conduction by either positive or negative gate current in both directions. While it switches off when the main current falls below the holding current limit.

Read more