ICs (Integrated Circuits)

DIL (Dual-In-Line) Package:

Pin 1 can be identified by a spot or notch on the package, as well as the orientation of the writing on it. The pins are numbered anticlockwise (see diagram below).

PLCC (Plastic Leaded Chip Carrier) Package:

Holding the device with the cut-off corner at the top left, pin 1 is in the middle of the top row of pins and is identified by a spot on the package. The pins are numbered anticlockwise from this point (see diagram below).

PQFP / MQFP (Quad Flat Pack) Package:

With the cut-off corner in the top left-hand corner, pin 1 is at the top of the left-hand row of pins. The pins are numbered anticlockwise from this point.

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