2N684

Series:	--
Packaging:	Bulk
Part Status:	Obsolete
Voltage - Off State:	150V
Voltage - Gate Trigger (Vgt) (Max):	2V
Current - Gate Trigger (Igt) (Max):	40mA
Voltage - On State (Vtm) (Max):	2V
Current - On State (It (RMS)) (Max):	25A
Current - Hold (Ih) (Max):	100mA
Current - Off State (Max):	13mA
Current - Non Rep. Surge 50, 60Hz (Itsm):	200A @ 60Hz
SCR Type:	Standard Recovery
Operating Temperature:	-65°C ~ 125°C
Mounting Type:	Chassis, Stud Mount
Package / Case:	TO-208AA, TO-48-3, Stud
Supplier Device Package:	TO-48

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Thyristors – SCRs: 2N684 Application Fields and Working Principles

Thyristors are a group of semiconductor devices similar to transistors but with four layers of alternating P-type and N-type material. These devices are also known as Silicon Controlled Rectifiers (SCRs) and are available in many forms. They have high voltage and current ratings and are commonly used in the fields of control and switching for many requirements.The silicon controlled rectifier (SCR), represented by the part number 2N684, is a 4-layer three terminal thyristor. It is comprised of four layers of P-type or N-type silicon, with the two layers of P-type material connected among one another, and the two layers of N-type material also connected to each other. The two outside terminals are the anode (marked A) and cathode (marked C) and are connected to the P and N layers, respectively. The third terminal, usually marked ‘G’ for gate, is used to control the flow of current.SCR’s have a very wide range of applications, mainly in the area of switching and controlling power in electrical circuits. In some applications, SCR\'s are used in place of mechanical switches, relays, or fuses, to provide increased speed of response and increased reliability – the SCR can switch off supply quickly in the event of a fault, whereas mechanical switches and relays can wear out quickly, reducing their reliability. In other applications, SCR’s are used as power controllers, where their ability to control the conduction angle of the current can be used to control the output power of a load.Due to its four layer structure, the 2N684 SCR can operate in both the forward and reverse bias modes. In the forward mode, when the anode is made positive with respect to the cathode, the SCR will remain in a conducting state until the current is sufficiently reduced. In the reverse mode, the anode is made negative with respect to the cathode, and the current flow is blocked until the gate is used to trigger the SCR into conduction.The working principle of the 2N684 is that the gate electrode acts as a switch, allowing current to pass from the anode to cathode when the gate is triggered by a potential difference. When the gate potential is higher than the cathode voltage a region of n-channel conduction is established in the upper junction, allowing electric current to pass through. Similarly, when the gate voltage is lower than the anode voltage, p-channel conduction is established in the lower junction, allowing current to pass through.The 2N684 is an ideal choice for many switching and controlling applications because of its high peak current and breakdown voltage ratings. It is highly reliable, with a long service-life and can be continuously switched without any significant loss of performance. In conclusion, the 2N684 is a very useful and reliable way to switch and control electrical power.

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