The device is popular as a triggering device and is not suited for driving power loads. Programmable unijunction transistor programmable unijunction transistor triggers designed to enable the engineer to program unijunction characteristics such as rbb, iv, and ip by merely selecting two resistor values. The unijunction transistor ujt thyristors electronics. N channel junction field effect transistors, depletion mode type a designed for audio and switching. Download 2n2647 datasheet from comset semiconductors. The capacitor c1 is for triggering the ujt and resistor r3 is for limiting the flow of charge to capacitor. The 2n2646 is a silicon unijunction transistor with 30v emitter to base voltage. Jun 26, 2019 2n2647 datasheet pdf highreliability discrete products and engineering services since 2n, 2n silicon unijunction transistor. The data sheet for a 2n2646 unijunction transistor gives the intrinsic.
Although a unijunction transistor is not a thyristor, this device can trigger larger thyristors with a pulse at base b1. Buy 2n2647 multicomp pro unijunction ujt transistor, 2 a, 1 a, 10 ma, to18, 3 pin, 125 c at element14. The ujt is consist of a light doped ntype of silicon bar, there is a heavily doped ptype of region at one side of the ntype of bar. Aug 12, 2019 2n2647 datasheet pdf shop magnetic and reed switches. A unijunction transistor is composed of a bar of ntype silicon having a ptype connection in the middle. Unijunction transistor and ujt relaxation oscillator. Download 2n2647 datasheet from central semiconductor. Silicon pn unijuction transistor, 2n2646 datasheet, 2n2646 circuit, 2n2646 data sheet. Silicon planar unijunction transistors have a structure resulting in lower saturation voltage, peakpoint. The unijunction transistor ujt workforce libretexts. The 2n is designed for use in pulse and timing circuits, sensing circuits and thyristor trigger.
Electronics tutorial about the unijunction transistor or ujt and how unijunction. Comset semiconductors 2n2646, and, 2n2647 datasheet pdf. Highreliability discrete products and engineering services since 1977 2n2646, 2n2647 silicon unijunction transistor rev. Unijunction transistor 2n2646 of 2n2646 transistor 2n2647 2n2646. In fact, the relaxation oscillator was one of the most popular uses of the ujt. Solid state mfg has been a leading supplier of semiconductors to the battery charger, plating, welding, oil field, locomotive, and rail transport industries for over 40 years. Getting to know the ujt, april 1970 popular electronics rfcafe. Introduction to unijunction transistor construction and. The 2n2646 is intended for general purpose industrial applications where. May 31, 20 as is explained in detail in the article, the net effect of the ujt s arrangement is a region of negative resistance which makes it good for use as an oscillator. In addition, thesedevices are much faster switches.
Unit datasheet search, datasheets, datasheet search site for electronic components and semiconductors, integrated circuits, diodes and other semiconductors. Jul 26, 2019 2n2647 datasheet pdf highreliability discrete products and engineering services since 2n, 2n silicon unijunction transistor. Solid state mfg has been datashet leading supplier of semiconductors to the battery charger, plating, welding, oil field, locomotive, and rail transport industries for over 40 years. The original unijunction transistor, or ujt, is a simple device that is essentially a bar of ntype semiconductor material into which ptype material has been diffused somewhere along its length, fixing the device parameter the intrinsic standoff ratio. The unijunction transistor, abbreviated ujt, is a threeterminal, singlejunction device.
Ujt 2n2646 specification 2n2646 ujt scr 2n2646 put 2n2646 2n2647 scr firing inverter circuit 2n2646 ujt 2n2646 ratings ujt 2n2646 range text. To92 ujt 2n4870 ujt 2n2646 oscillators of ujt 2n2646 ujt transistor ujt. Original unijunction transistor or ujt is a simple device in which a bar of ntype semiconductor material into which ptype material is diffused. Philips silicon unijunction transistor,alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. Unijunction transistor, to18 online from elcodis, view and download 2n2646 pdf datasheet, transistors unijunction ujt specifications. Download 2n2647 datasheet from boca semiconductor corporation. The 2n2646 is designed for use in pulse and timing circuits, sensing circuits and thyristor trigger circuits. I recently came across someone asking for the same component.
Buy 2n2647 multicomp pro unijunction ujt transistor, 2 a, 1 a, 10 ma, to18, 3 pin, 125 c at farnell. Boca, alldatasheet, datasheet, datasheet search site for electronic components. I semiconductors encourages customers to verify that datasheets are current. Silicon unijunction transistor, 2n2646 datasheet, 2n2646 circuit, 2n2646 data sheet. The resistance of rb1, the saturation resistance is lowest at the valley point. Diagram details datasheet, cross reference, circuit and application notes in pdf format.
In addition, these devices are much faster switches. May 17, 2019 2n2647 datasheet pdf highreliability discrete products and engineering services since 2n, 2n silicon unijunction transistor. Buy your 2n2647 from an authorized multicomp pro distributor. The basic ujt and its variations are essentially latching switches whose operation is similar to the fourlayer diode, the most significant difference being that the ujts switching voltage can be easily varied by the circuit designer. The 2n2647 is a silicon pn unijunction transistor designed for use in pulse and timing circuits, sensing circuits as well thyristor trigger circuits. The central semiconductor 2n2646 and 2n2647 devices are silicon pn unijunction transistors designed for general purpose industrial applications. With completion of capacitor discharge the ujt will again return to normal off state and will stay in that state until the capacitor discharges again. Highreliability discrete products and engineering services since 1977.
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