Re: [SI-LIST] : different 4-layer board Stack up (S-P-G-S) ?

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From: Abd ul-Rahman Lomax (marjan@vom.com)
Date: Tue Mar 07 2000 - 12:58:40 PST


At 11:14 AM 3/7/00 -0700, ajmani@us.ibm.com wrote:

>By the way, can someone enlighten me on how 0.062" came to be the standard
>board thickness.

I haven't seen any documentation, but the reason is fairly obvious. 1/8
inch was thicker than necessary for most applications and 1/32 inch was too
thin, so 1/16 was chosen. .031 and .125 are still standard core
thicknesses, along with 3/32, 0.093. We see the same history in 1/2 ounce,
1 ounce, and 2 ounce copper foil.

marjan@vom.com
Abdulrahman Lomax
P.O. Box 690
El Verano, CA 95433

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