Quoting Jim Brain <brain at jbrain.com>:
On a 4116, pin 1 is -5V, while the 4164 is N/C. Every
guide online says
to snip off pin 1 if migrating to 4164s in a 4116 footprint, but I don't
understand why. If pin 1 on a 4164 is truly N/C, then why does it
matter if the pin is inserted?
Jim
--
Jim Brain
brain at
jbrain.com
www.jbrain.com
i no longer remember the brand, but there is one or two manufacturers of 4164's
where pin 1 was connected internally to ground.