![]() ![]() 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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