To understand how a pnp transistor works, simply flip the polarity or and transistor. The bipolar junction transistor or simply bjt is a three layer, three terminal and two junction semiconductor device. A transistor in saturation mode acts like a short circuit between collector and emitter. Gridaine automates programmables 1 automatesautomates. Des didacticiels en pdf sur les transistors a jonction bipolaire et les interrupteurs a transistor. Working of transistor as a switch npn and pnp transistors. Pnp transistor circuit characteristics, working, applications. In a transistor a very small current input signal flowing emitter tobase is able to control a much larger current which flows from the system power supply, through the transistor emitter tocollector, through the load, and back to the power supply. Tm241c24t controller m241 24 io transistor pnp schneider. The majority of this page focuses on npn transistors. Cablage des entrees et sorties des automates programmables. Between output and internal logic at 500 v ac noninsulated between outputs.
Il sagit, dans le premier cas, dun transistor npn, et dans le deuxieme cas, dun transistor pnp. The arrow for bjt transistors is always located on the emitter terminal and also it indicates the direction of conventional current flow. Tm3dq8tg module tm3 8 outputs transistor pnp spring. A pnp transistor is on when the value of the voltage source connected to the base is low and turned off when it is high. Pdf tutoriel arduino transistors pdf cours arduino. Pour automate a logique negative lorsque quil y a detection, le transistor est passant contact ferme. A typical switching circuit using a pnp transistor is shown at the left.