ASCEL Electronic AE20218, Руководство по сборке и эксплуатации

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6 Transistors
Transistors must be mounted in the correct orientation. The flat
side of the transistor must match the correspondent side in the
silkscreen drawing. The leads may not cross.
Note: field-effect transistors (FETs) are extremely
sensitive to ESD.
7 Crystal
The polarity of the crystal is not relevant, but the bottom side
of the package is conductive.
To prevent shorts, the crystal
should be mounted with a little distance to the board (see
the image on the next page).
12