2N1803

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Part Status:	Active
Current - Non Rep. Surge 50, 60Hz (Itsm):	--
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2N1803 Application Field and Working PrincipleThyristors - SCRs, or Silicon Controlled Rectifiers (SCRs) are one of the most versatile and robust semiconductor devices available for a variety of applications. The 2N1803 SCR, in particular, is a three-terminal device that can be used to control the switching of high-power appliances, like air conditioners and resistive heating elements, as well as to provide protection against electrical transients. This article examines the application field and the working principle of the 2N1803 SCR.ApplicationsThe 2N1803 SCR is a popular choice in a variety of applications where electrical current needs to be controlled. The voltage sensitivity of this device makes it a great choice for controlling AC motors, where it is often used as a starter for single-phase induction motors.The 2N1803 SCR is also used to protect against electrical transients and surges, either through the application of an overvoltage crowbar or through the placement of an SCR in series with the protected load. In addition, the 2N1803 SCR can be used as an electronic power switch, with its low on-state voltage drop and high forward blocking-voltage characteristic making it a great choice for controlling the switching of resistive heating elements.Working Principle The 2N1803 SCR consists of a silicon body, with three connections to external terminals. When a small current is introduced at the gate terminal, it will turn the SCR into conducting mode. The current flowing through the device can now be controlled by adjusting the voltage applied to the gate terminal.The 2N1803 SCR is a three-terminal device and its unmatched static and dynamic characteristics allow it to be used in a wide variety of applications. It is an excellent choice for AC motor control, protection against electrical transients, and switching of resistive heaters. The two-terminal version of this device, the 2N1803T, is a good choice for DC motor control, phase control in AC circuits, and phase synchronization. In summary, the 2N1803 SCR is a versatile and robust semiconductor device, capable of delivering reliable performance in a wide range of electronic applications.

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