resistor values. UJT is an excellent switch with switching times in the order of nano seconds. UJT Characteristics and Relaxation Oscillator. But the difference between UJT and FET is that P-Type Gate material is surrounded around N-type material. 5.1) consists of a rod of n-type silicon to the ends of which ohmic (non-rectifying) contacts B 1 and B 2 are made. PUT is not a UJT (junction transistor). A Unijunction transistor is a three terminal semiconductor device having only one p-n junction like diode but has three terminals. Unijunction Transistor TO39 Type Package Description: The NTE6400 & NTE6400A Silicon Unijunction Transistors are three terminal devices having a stable “N” type negative resistance characteristic over a wide temperature range. Figure-8 depicts characteristics of UJT. The curve has three regions: (1) Cutoff region (2) Negative Resistance region, (3) Saturation region. UNIJUNCTION TRANSISTORS (UJTs) The unijunction transistor (UJT), shown in figure 2-14, is a solid-state, three-terminal semiconductor that exhibits stable open-circuit, negative-resistance characteristics. The two parts of the base form a voltage divider, which sets the operating point of the UJT. Unijunction Transistor. It is a three-terminal device used as an ON-OFF switching transistor. In normal operation the lower ohmic contact (base B 1) is grounded. The device has-a unique characteristic that when it is triggered, its emitter current increases re generatively (due to negative resistance characteristic) until it is restricted by emitter power supply. A unijunction transistor (UJT) ... displays similar characteristics to the UJT. Figure-9 depicts structure and symbol of Bipolar junction Transistor. It has 3 terminals like other transistors and are called: K (cathode), A (anode), G (gate). The characteristics of Unijunction Transistor (UJT) is given below. Fig.2 shows the typical family of V E /I E characteristics of a UJT at different voltages between the bases. This device has a unique characteristics that when it is triggered, the emitter current increases regeneratively until is limited by emitter power supply. It is made up of n-type silicon wafer having two base controls and a p-type alloy junction which acts as emitter electrode. In spite of having transistor added to its name, a Unijunction Transistor (UJT) working and characteristic curve varies completely from other counterparts. Unijunction transistor: (a) emitter characteristic curve, (b) model for VP . Let increasing this voltage from zero. V E is positive with respect B1. UJT relaxation oscillator is a type of RC ( resistor-capacitor) oscillator where the active element is a UJT (uni-junction transistor). Unijunction Transistor is such a transistor that has a single PN junction, but still not a diode. The relaxation oscillator is an application of the unijunction oscillator. Programmable Unijunction. Application includes thyristor–trigger, oscillator, pulse. The figure below shows the characteristic of UJT, it derives the relationship between V E and I E. As we can see in the figure, I E does not exceed I Eo, which is nothing but equivalent to the leakage current in the reverse direction of BJT. Application includes thyristor−trigger, oscillator, pulse and timing circuits. A programmable unijunction transistor (PUT) is a three-lead electronic semiconductor device which is similar in its characteristics to a unijunction transistor, except that it is programmable. This helps explains the characteristics of a UJT, since we monitor its behavior when different voltage levels are given to it, which in turn, helps us understand UJTs better. Just because you see the characteristics curve doesn't mean you understand it. characteristics such as RBB, η, IV, and IP by merely selecting two. There are basically two output signals: a negative-going pulse at UJT base 2, and a positive-going pulse at base 1. The unijunction transistor(UJT) is a three terminal device with characteristics very different from the conventional 2 junction, bipolar transistor. Unijunction transistor: (a) emitter characteristic curve, (b) model for V P . Explanation of Characteristics Curve. Figure-10 depicts output characteristics of transistor in common base and common emitter configurations. Cutoff- This is the region where the unijunction transistor doesn't yet receive enough voltage to turn on. Transistor Triggers. A complementary UJT is obtained by reversing the process involved in UJT as P-type base with N-type emitter terminal.
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