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TM 9-254
7-7. Semiconductor Identification
a. Diodes. Diodes also are found in many shapes and sizes. They perform a wide variety of functions within a circuit
such as rectifying an AC voltage or waveform shaping. Diodes are typically marked with a number consisting of IN
followed by a series of numbers. The IN identifies the part as a diode and the following numbers identify the particular
type of diode. Figure 7-13 shows some of the typical sizes and shapes in which diodes are found. This figure provides an
aid in identifying the positive (anode) and negative (cathode) terminals of the diode as related to the schematic symbol for
a diode which is shown in figure 7-14. Diodes and other electronic components must be installed with the correct polarity
to function properly. If the polarity is reversed, the diode as well as the rest of the associated components and circuit
could be damaged. The polarity of a semiconductor is usually shown by colored dots, bands, caps, letters, or symbols,
and positive (+) or negative (-) signs.
Figure 7-13. Typical Diode Shapes and Markings
ANODE (+)
(-) CATHODE
Figure 7-14. Diode Schematic Symbol
7-14 Change 6
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