![]() ![]() ![]() Bipolar transistor symbols with a circle around them indicate a descrete device while those without a circle indicate its use within an internal circuitry. The schematic symbols used for bipolar junction transistors, or BJT’s indicate the two main types, NPN (Negative-Positive-Negative) transistors and PNP (Positive-Negative-Positive) transistors. Schematic Semiconductor Symbols for Bipolar Junction Transistors Schottky diode consisting of an n-type semiconductor and metal electrode junction producing a very low forward voltage drop and power dissipation and faster switching speed compared to a pn-junction diodeĪ semiconductor diode which emits a range of visible and non-visible coloured light from its pn-junction depending on the materials and doping used when forward biasedĪ semiconductor photosensor which allows current to flow through itself in the reverse direction when exposed to incident light energy ![]() Available in a range of reverse breakdown voltage values Zener diode used in its reverse voltage breakdown region for voltage limiting, transient suppression and regulation applications. Commonly used in small-signal, rectification or high current applications Semiconductor pn-junction diode which passes curent when forward-biased, and blocks current flow when reverse-biased. ![]() The schematic symbol for a light emitting diode (LED) shows light energy dipicted by smaller arrows radiating from it when forward-biased. The schematic semiconductor symbol for a zener diode and a Schottky diode are similar to that of the basic pn-junction diode except that the line representing the Cathode (K) terminal of the symbol is bent at both ends. However, if the polarity of the voltage is reversed, no current flows. The schematic symbol of a diode also shows that if forward-biased, current will flow through the direction of the arrow. The basic schematic symbol for a diode looks like an arrow head that points in the direction of conventional current flow from its Anode (A) terminal to its Cathode (K) terminal. Generally a diodes cathode lead is identified by a coloured band. The schematic semiconductor symbols for each of these diode types uses the same basic diode format, but is modified to indicate their different functions.ĭiodes are two-terminal devices which consist of two semiconductor materials fused together to produce a pn-junction where the “n”-type material is the cathode and the “p”-type material is the anode. Some of the major diode types include here are the pn-junction, Schottky, photo diode, and light emitting diode. There are many different types of semiconductor devices which can be classed as a diode, and for most of these types they have a distinct circuit symbol. Schematic Semiconductor Symbols for Diodes The symbols listed below conform to the recommendations of the International Electrotechnical Commission (IEC) and the British Standards Institution (BSI). These days semiconductor symbols are being standardised internationally with the symbols for diodes, transistors, and power electronic devises being of a common design. Graphical symbols used on electrical circuit diagrams are wide and varied and many of these symbols vary from country to country. The physical layout and positioning of semiconductor devices on a circuit board is generally quite different from that of a circuit diagram. The shape and outline of a semiconductor symbol is used to represent exactly their operation and current flow direction for connection to the correct electrical polarities allowing them to be connected together. Letter symbols, numbers and subscripts based on the Roman and Greek alphabets are commonly used with a semiconductor symbol to identify their different input or output terminals with regards to conventional current flow. A typical electrical or electronic symbol comprises of an outline together with one or more identification symbols. Semiconductor symbols are used to represent various electronic devices and components as pictograms. ![]()
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