DATASHEET UJT 2N2646 PDF

The device is preferred in other applications where guaranteed minimum pulse amplitude is required and also where a low emitter leakage current and a low peak point emitter current trigger current are required. How to use 2N Transistor 2N has many application circuits but for understanding the working let us consider the relaxation oscillator circuit of the device. In the above circuit we are working 2N as a relaxation oscillator to produce trigger pulses or oscillations. The capacitor C1 is for triggering the UJT and resistor R3 is for limiting the flow of charge to capacitor.

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I always come with unique topics to whet your appetite with valuable information so you can excel in your relevant field. Today, I am going to unlock the details on the Introduction to 2n It is a uni-junction transistor which is mainly used in thyristor triggering circuits, sensing circuits, and pulse and timing circuits. Introduction to 2n 2n is a three terminal semiconductor device that contains only one junction that behaves like an electrically controlled switch.

This uni-junction transistor UJT can not be used as a linear amplifier but it is widely used in triggered oscillators, free-running oscillators, and pulse generation circuits of low frequencies. Typical uni-junction 2n contains three terminals named as emitter E , base 1 B1 and base 2 B2. Sometimes it is also referred as a double base diode.

The base is composed of lightly doped n-type silicon. The emitter is heavily doped and contains p-type material. The name of the device is based on the single junction formed between n-type and p-type material. When the emitter is behaved as open-circuit, the resistance between B1 and B2 is called inter-base resistance. Only a fraction of current will flow from B1 to B2 when there is no potential difference between emitter and base terminals.

However, if large voltage is applied at the emitter terminals then a very large current will flow from B1 to B2 which ultimately generates larger B2 output current. This UJT normally functions when emitter junction is forward biased while JFET normally functions when gate junction is reversed biased. It is also referred as a current controlled with negative resistance. It is an ideal choice for firing circuits that are widely used in silicon controlled rectifiers.

Working of 2n When this device is triggered it allows the emitter current to increase until it is limited by the help of emitter power supply.

It can be used as an oscillator because it exhibits a negative resistance. This UJT gets biased when positive voltage is applied between the two bases. It will cause a potential drop in the device. The current will start to flow from emitter to base region, when emitter voltage is exceeded one diode voltage above the voltage where diffusion of P-type material occurs. This additional current at the base region allows the resistance between emitter and B2 lead to decrease, hence overall improves the conductivity of the device.

This resistance drop will make the emitter junction forward biased which helps in injecting the more current. Absolute Maximum Ratings Absolute maximum ratings of 2n is shown in the figure below. Stresses above than the given values can damage the device. Also if stresses are applied for extended period of time above normal operating values, they can effect the device reliability. Electrical Characteristics Electrical characteristics of 2n are shown in the figure below. The 2n is mainly manufactured for the purpose where low peak point emitter current, and low emitter leakage current is required.

Applications 2n is mainly used in pulse and timing circuits. It is a building block of thyristor triggering and sensing circuits. Free-running oscillators and pulse generation circuits with low frequencies use this UJT because it exhibits negative resistance. I always try to sort out information into small steps so you can digest the information easily.

I hope you have enjoyed the article and got a clear idea what this UJT does and what are its main applications? However, if still you feel skeptical or have any doubt you can ask me in the comment section below. Stay Tuned!

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Transistor 2N2646

I always come with unique topics to whet your appetite with valuable information so you can excel in your relevant field. Today, I am going to unlock the details on the Introduction to 2n It is a uni-junction transistor which is mainly used in thyristor triggering circuits, sensing circuits, and pulse and timing circuits. Introduction to 2n 2n is a three terminal semiconductor device that contains only one junction that behaves like an electrically controlled switch. This uni-junction transistor UJT can not be used as a linear amplifier but it is widely used in triggered oscillators, free-running oscillators, and pulse generation circuits of low frequencies. Typical uni-junction 2n contains three terminals named as emitter E , base 1 B1 and base 2 B2. Sometimes it is also referred as a double base diode.

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