IC Orientation

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All integrated circuit chips have a identifier to help you locate Pin 1 on the chip. IC pins are numbered in a counter clockwise fashion from pin 1. The various means to identify Pin 1 include:

  • A Circle or Dot next to Pin 1
  • A Half Circle or Notch on the end of the chip, Pin 1 is to the left of the notch.
  • A Beveled Edge or Notch down one side of pins of the IC, Pin 1 is the left most pin on the notched side
  • A Beveled Edge on the end of the package, Pin 1 is to left of the Beveled Edge.


For pictures of these methods, see this document.