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You may also use a circuit symbol of a diode to show the orientation, however this requires more space on a board than a letter and may not be useful for dense board layouts. To verify the proper way to place a diode onto a PCB, it is best to use an “A” for anode or a “K” for cathode (C is used to label capacitors thus to avoid confusion we recommend K for cathode). Figure 2 shows common power supply and ground configurations where the laser anode is connected directly to the power supply this is a common configuration for commercially-available laser drivers. Furthermore, an LED usually has a (+) anode, but not all the time. In most cases, grounding the laser diode and power supply is straightforward. For zener or barrier diodes, the (+) marking may or may not be the cathode of the component.
#DIODE ANODE HOW TO#
However, a board that has a (+) silk screen marking is not enough information to tell the assembly house how to correctly insert a diode because there are different types of diodes. To ensure proper installation by your circuit assembler, it is important to include a mark on the silkscreen layer to identify which terminal is the anode and which terminal is the cathode.
This directionality requires that the component be assembled in a particular orientation in order to operate as intended. Diodes are a type of circuit component which conducts electricity typically in one direction as they have a low resistance in one direction and very high resistance in the other direction.
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