Editing Dual in-line package (section)

==Orientation and lead numbering==
[[Image:Pin numbering 01 Pengo.svg|thumb|upright=0.8|Pin numbering is counter-clockwise]]

As shown in the diagram, leads are numbered consecutively from Pin 1. When the identifying notch in the package is at the top, Pin 1 is the top left corner of the device. Sometimes Pin 1 is identified with an indent or paint dot mark.

For example, for a 14-lead DIP, with the notch at the top, the left leads are numbered from 1 to 7 (top to bottom) and the right row of leads are numbered 8 to 14 (bottom to top).

Leads are skipped on some DIP devices (e.g. [[segment display|segmented LED display]]s, relays, or devices that replace leads with a heat sink fin). The remaining leads are numbered as if all positions had leads.

In addition to providing for human visual identification of the orientation of the package, the notch allows automated chip-insertion machinery to confirm correct orientation of the chip by mechanical sensing.{{citation needed|date=October 2011}}