RE: [SI-LIST] :PCB Bd thkness'

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From: Chris Padilla ([email protected])
Date: Tue Mar 07 2000 - 14:27:43 PST

Well, which came first, the chicken or the egg?

...or, the board thickness or the connectors?


>I always thought the .062", .093", .125" was for through hole leads,
>press fit connector length, and edge card connectors. Standardize
>for consistancy and repeatability. That's what I was taught.....
>-----Original Message-----
>From: Abd ul-Rahman Lomax [mailto:[email protected]]
>Sent: Tuesday, March 07, 2000 12:59 PM
>To: [email protected]
>Subject: Re: [SI-LIST] : different 4-layer board Stack up (S-P-G-S) ?
>At 11:14 AM 3/7/00 -0700, [email protected] 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.
>ma[email protected]
>Abdulrahman Lomax
>P.O. Box 690
>El Verano, CA 95433

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