Commonly used names in diode schematic diagram are diode (common diode), diode Schottky (Schottky diode), tunnel to Germany (diode VARCTOR), ZENER 1~3 (Zener diode), light emitting diode: LED；; Packaging can only be packaged with capacitors.

In PROTEL 99SE, light emitting diodes (LEDs) are packaged in the form of LED 3 and 5. The positioning component can be dragged to the required position or double-click the component to position with coordinates, and it can be locked to prevent movement when it is misoperated.