The 7.62mm and TTL ICs. Logic Circuits, 6/101

Before NATO switched their favorite round caliber for small arms to 5.56mm, the 7.62mm was king.
If I’ve got it right, the today’s flavor is 6.8mm?
I am not a historian, and not skilled in ammunition details at all.
However, after reading a number of books about the Integrated Circuits history, that unexpected coincidence looks still striking: how come the distance between the 2 rows of terminals became 7.62mm?
It could have been chosen any other size.
Still, it’s similar to standard cigarettes diameter, or pencils, or the AK-47 round caliber. And the list goes on.
I didn’t mention it in the video, but there is a mystery to me why the Russians chose that particular caliber size, which is exactly 0.3” in the Imperial System? It seems that they already had a 7.62mm caliber in use, even back in the 19th Century.
My favorite book about the ICs birth and early evolution is “History of semiconductor Engineering” by Bo Lojek. It’s tedious to look for such peculiar info, but there is no mention about ICs 0.3” genesis anywhere in the otherwise well documented ICs evolution.
That specific size was used by all reputed companies not only for TTL, but for their analog ICs too, from TI to Fairchild or National Semiconductor.
Thanks for watching and CU next Tuesday!

[@zakizaki1197]

I'll always remember the size of 7.62 mm or 0.3 inch. A nice lesson about the history. Thank you

[@CU_Wiring_Electronic_Projects]

@zakizaki1197 Hey Zaki! I'm always very grateful to you for your constant interest. Keep in touch.

[@kenkostan]

very interesting - nice explanation

[@CU_Wiring_Electronic_Projects]

@user-th4qd8kl8g Thank you Stan, I am very grateful for your interest