A good rule of thumb for determining the pin numbers of dual- in- line package IC chips would be to place the notch to your right and pin 1 will always be in the lower right corner.

Question

Quizplus · Accepted Answer

The correct orientation for determining the pin numbers of a dual-in-line package (DIP) IC chip is to place the notch (or sometimes a dot) to your left; pin 1 will then be on the upper left corner.

A Good Rule of Thumb for Determining the Pin Numbers