I just bought 74HC595 shift register IC and I'm having trouble finding the first pin. There is no first pin mark anywhere on the chip as you can see below.
Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. It only takes a minute to sign up.Sign up to join this community
You walk to the manufacturer's web site, look the data sheet up: http://www.nxp.com/documents/data_sheet/74HC_HCT595.pdf and there on page 17, you'll find a nice drawing of your package. The drawing will show you that the package is not totally symmetrical, the top edge of one of the longer sides of the package is slanted, and pin 1 is on that side.