2N1796

Series:	--
Packaging:	Bulk
Part Status:	Active
Voltage - Off State:	250V
Voltage - Gate Trigger (Vgt) (Max):	3V
Current - Gate Trigger (Igt) (Max):	70mA
Voltage - On State (Vtm) (Max):	2.3V
Current - On State (It (AV)) (Max):	70A
Current - On State (It (RMS)) (Max):	110A
Current - Off State (Max):	16mA
Current - Non Rep. Surge 50, 60Hz (Itsm):	1000A @ 60Hz
SCR Type:	Standard Recovery
Operating Temperature:	-40°C ~ 125°C
Mounting Type:	Chassis, Stud Mount
Package / Case:	TO-209AC, TO-94-4, Stud
Supplier Device Package:	--

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Thyristors - SCRs

A thyristor is a specialized type of semiconductor that acts as an electrical switch whose switching is triggered by applying a voltage to its gate. It belongs to a family of devices that are known as four-layer semiconductors. SCRs (Silicon Controlled Rectifiers) are the most commonly used type of thyristor and act as a two-way switch, allowing current to pass when it is triggered, and preventing it otherwise.The 2N1796 is a type of SCR, and its purpose is to protect electronic components from excess current when used in circuits. It is a low-cost device and is often used in low-current applications that are too small to warrant the use of a heavier-duty device.The 2N1796 application field and working principle can be understood in three main parts: its construction and operation, its triggering requirements, and its electrical characteristics.Construction and OperationThe 2N1796 features three main parts: an Anode, a Cathode, and a Gate. The Anode and Cathode are connected to the external electrical circuit, while the Gate is connected to a control circuit.When no current is flowing between the Anode and Cathode, the 2N1796 resists the passage of current. This makes it an ideal device for protecting electrical circuits when low currents are present.When a current is applied between the Anode and Cathode sufficient to trigger it, the 2N1796 will turn on, allowing the passage of current between the Anode and Cathode. This can be useful for limiting the amount of current that can pass through a circuit, or for controlling the timing of when current can be passed.Triggering RequirementsThe trigger voltage required before the 2N1796 will turn on depends on the current being used. The higher the current, the higher the trigger voltage needed. This is due to the fact that the resistance of the SCR needs to be overcome before it will turn on and allow the current to pass.The 2N1796 requires a minimum of 1.5 volts to operate, and will turn on when the trigger voltage reaches this point. The current can also be increased to increase the trigger voltage, up to a maximum of 80 volts.Electrical CharacteristicsThe electrical behavior of the 2N1796 can be summarised in terms of its Forward-Voltage Drop, Holding Current, and Gate Trigger Current.The Forward-Voltage Drop is the voltage difference between the Anode and Cathode when it is activated and current is passing through it. Typically this is around 0.4 volts at high current levels and 0.2 volts at low current levels.The Holding Current is the current needed to keep the 2N1796 activated and current flowing. This should be kept at or below the 10 milliamp threshold.The Gate Trigger Current is the minimum current needed to trigger the SCR. Typically this is between 1 and 2 milliamps.ConclusionThe 2N1796 is a type of SCR that has many different applications in electrical circuits. It is a low-cost and low-power device that is used to limit the current that can pass through a circuit, or to control the timing of when current passes.The 2N1796 requires a minimum of 1.5 volts to trigger, and has a Forward-Voltage Drop of between 0.2 and 0.4 volts, as well as a Holding Current and Gate Trigger Current of 10 milliamps and 1-2 milliamps, respectively.

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