UJT 2N2646 DATASHEET EBOOK

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High-reliability discrete products and engineering services since 2N, 2N SILICON UNIJUNCTION TRANSISTOR. Rev. FEATURES. 2N Unijunction Transistor. TO−18 Package. Description: The 2N is designed for use in pulse and timing circuits, sensing circuits and thyristor trigger . 2N 2N SILICON UNIJUNCTION TRANSISTORS. Silicon Planar Unijunction Transistors have a structure resulting in lower saturation voltage.


Ujt 2n2646 Datasheet Ebook

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2N 2N SILICON. PN UNIJUNCTION TRANSISTORS. TO (UJT) CASE - MECHANICAL OUTLINE. LEAD CODE: 1) Emitter. 2) Base 1. 3) Base 2. Technical Datasheet: 2N Datasheet. See all Technical The 2N is a Silicon Unijunction Transistor with 30V emitter to base voltage. mW Power. 2N – 2N 24/09/ 1 | 2. COMSET SEMICONDUCTORS. SILICON UNIJUNCTION TRANSISTORS. Silicon Planar Unijunction Transistors have a.

Oscillator drives SCR. During capacitor discharge through the E-B1 saturation resistance, a pulse may be seen on the external B1 and B2 load resistors, Figure above.

The load resistor at B1 needs to be low to not affect the discharge time. The external resistor at B2 is optional. It may be replaced by a short circuit. A more accurate expression for frequency is given in Figure above.

The charging resistor RE must fall within certain limits. It is inexpensive and in production. Though it serves a function similar to the unijunction transistor, the PUT is a three terminal thyristor. The PUT shares the four-layer structure typical of thyristors shown in Figure below. Moreover, the gate lead on the schematic symbol is attached to the anode end of the symbol. Programmable unijunction transistor: Characteristic curve, internal construction, schematic symbol.

The characteristic curve for the programmable unijunction transistor in Figure above is similar to that of the unijunction transistor.

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This is a plot of anode current IA versus anode voltage VA. The gate lead voltage sets, programs, the peak anode voltage VP. As anode current inceases, voltage increases up to the peak point.

Thereafter, increasing current results in decreasing voltage, down to the valley point. The PUT equivalent of the unijunction transistor is shown in Figure below. Resistor R charges the capacitor until the peak point, Figure previous , then heavy conduction moves the operating point down the negative resistance slope to the valley point.

A current spike flows through the cathode during capacitor discharge, developing a voltage spike across the cathode resistors. After capacitor discharge, the operating point resets back to the slope up to the peak point. PUT relaxation oscillator Problem: What is the range of suitable values for R in Figure above , a relaxation oscillator?

The charging resistor must be small enough to supply enough current to raise the anode to VP the peak point Figure previous while charging the capacitor. Overall, the effect is a negative resistance at the emitter terminal. This is what makes the UJT useful, especially in simple oscillator circuits.

There are two types of unijunction transistor:

Unijunction transistor circuits were popular in hobbyist electronics circuits in the 's and early 's because they allowed simple oscillators to be built using just one active device.

Later, as Integrated Circuits became more popular, oscillators such as the timer IC became more commonly used.

This application is important for large AC current control. Unijunction transistor: Although a unijunction transistor is not a thyristor, this device can trigger larger thyristors with a pulse at base B1.

A unijunction transistor is composed of a bar of N-type silicon having a P-type connection in the middle. See Figure below a. The connections at the ends of the bar are known as bases B1 and B2; the P-type mid- point is the emitter. It varies from 0. Beyond the peak point, current increases as voltage decreases in the negative resistance region. The voltage reaches a minimum at the valley point. The resistance of RB1, the saturation resistance is lowest at the valley point.

Unijunction transistor: a emitter characteristic curve, b model for VP. The relaxation oscillator in Figure below is an application of the unijunction oscillator. RE charges CE until the peak point.

The unijunction emitter terminal has no effect on the capacitor until this point is reached. Once the capacitor voltage, VE, reaches the peak voltage point VP, the lowered emitter-base1 E-B1 resistance quickly discharges the capacitor.

Once the capacitor discharges below the valley point VV, the E-RB1 resistance reverts back to high resistance, and the capacitor is free to charge again. Unijunction transistor relaxation oscillator and waveforms. Oscillator drives SCR.

During capacitor discharge through the E-B1 saturation resistance, a pulse may be seen on the external B1 and B2 load resistors, Figure above.

The load resistor at B1 needs to be low to not affect the discharge time.

The external resistor at B2 is optional. It may be replaced by a short circuit.

A more accurate expression for frequency is given in Figure above. The charging resistor RE must fall within certain limits. It is inexpensive and in production. Though it serves a function similar to the unijunction transistor, the PUT is a three terminal thyristor.

The PUT shares the four-layer structure typical of thyristors shown in Figure below. Moreover, the gate lead on the schematic symbol is attached to the anode end of the symbol.

Unijunction Transistor

Programmable unijunction transistor: Characteristic curve, internal construction, schematic symbol. The characteristic curve for the programmable unijunction transistor in Figure above is similar to that of the unijunction transistor.Though it serves a function similar to the unijunction transistor, the PUT is a three terminal thyristor. The Unijunction Transistor UJT Chapter 7 - Thyristors Unijunction transistor: Although a unijunction transistor is not a thyristor, this device can trigger larger thyristors with a pulse at base B1.

It is a current-controlled negative resistance device. Netzero for linux.

You are on page 1of 14 Search inside document A unijunction transistor UJT is an electronic semiconductor device that has only one junction. It is inexpensive and in production.

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