Question T6B06
From subelement T6 - T6B
How is the cathode lead of a semiconductor diode often marked on the package?
Why is this correct?
The cathode lead of a semiconductor diode is marked with a stripe for easy visual identification. This stripe marking is a standard industry convention that allows technicians to quickly distinguish the cathode (negative terminal) from the anode (positive terminal). The other options are incorrect: diodes don't use text labels like "cathode" or single letters like "C" or "K" due to space constraints on small components.
Memory tip
Look for visual markings on semiconductor components rather than text labels. Physical markings like stripes, dots, or beveled edges are the standard because they're visible even on tiny components where text would be unreadable.
Learn more
In practical circuit construction, proper diode orientation is critical since diodes only conduct current when forward-biased (anode positive relative to cathode). Installing a diode backwards can prevent circuit operation or cause component damage. The stripe marking system is used across manufacturers worldwide, making it a reliable identification method. When breadboarding or soldering, always verify the stripe position matches your schematic's cathode symbol (the vertical line in the diode symbol).
Think about it
Why do you think manufacturers use a simple stripe marking rather than printing "cathode" or using letter codes on diode packages?