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2N Unijunction Transistor. TO−18 Package. Description: The 2N is designed for use in pulse and timing circuits, sensing circuits and thyristor trigger . 2N Datasheet, 2N Unijunction Transistor Datasheet, buy 2N Transistor. 2N datasheet, 2N pdf, 2N data sheet, datasheet, data sheet, pdf, Boca Semiconductor Corporation, Silicon PN Unijuction Transistor.

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The circuit is powered from single power source of VCC. By this we have UJT acting as an oscillator giving voltage pulses at the output and in a similar way we can use the device in other application circuits.

2N Transistor Pinout, Features, Circuit & Datasheet

The device is preferred in other applications where guaranteed minimum pulse amplitude is required and also where a low emitter leakage current and datsheet low peak point emitter current trigger current are required. In the above circuit we are working 2N as a relaxation oscillator to produce trigger pulses or oscillations.


Under such case we will have VB2 or UJT voltage drop taking a sharp dip as shown in graph and at other hand because of current flow a voltage appears across R2 VB1 there by datasheft a sharp pulse voltage as shown in graph.

This cycle of capacitor charge and discharge form a triggering cycle for the UJT to give voltage pulses at the output or VB2.

2N2646 Datasheet PDF

Working When the power just turned ON, the UJT will be in high resistance state and total supply voltage appears across it. When the power just turned ON, the UJT will be in high resistance state and total supply voltage appears across it.

Submitted by admin on 3 November With completion of capacitor discharge the UJT will again return to normal OFF state and datashfet stay in that state until the capacitor discharges again. TL — Programmable Reference Voltage.

Pin Configuration 2N is a three terminal device and the conductive case also connected to a terminal. How to use 2N Transistor 2N has many 2m2646 circuits but for understanding the working let us consider the relaxation oscillator circuit of the device.


With the flow of time the capacitor gets charged as the current flows through R3 to reach the capacitor.

The capacitor C1 is for triggering the UJT and resistor R3 is for limiting the flow of charge to capacitor. The device is popular as a triggering device and is not suited for driving power loads.

Once the capacitor gets charged to threshold voltage at a certain time T1, it will discharge by forcing the datasheey through emitter of the UJT. With this current flow at the emitter the UJT will get from high resistance to dayasheet resistance state and there by acting as a short circuit.