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May 2005

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Subject:
From:
Ofer Cohen <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Ofer Cohen <[log in to unmask]>
Date:
Fri, 13 May 2005 13:46:42 +0200
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Werner, Eddie,

The finished hole diameter is important only in one instance - when it is used for accurately-matched TH component, such as press-fit component. It is not relevant in case of connecting via (provided it is well-designed for curent carrying and signal integrity aspects). 



Ofer Cohen

Seabridge

A Siemens Company



> -----Original Message-----

> From: TechNet [mailto:[log in to unmask]] On Behalf Of Werner Engelmaier

> Sent: Friday, May 13, 2005 01:48

> To: [log in to unmask]

> Subject: Re: [TN] board fab

> 

> Hi Deac,

> Why is anybody still quoting finished hole diameters; for 

> vias we need the drilled hole diameters and the plating 

> thickness—the finished hole size is an anachronism left over 

> from through-hole technology.

> 

> Regards,

> Werner Engelmaier

> Engelmaier Associates, L.C.

> Electronic Packaging, Interconnection and Reliability Consulting

> 7 Jasmine Run

> Ormond Beach, FL 32174 USA

> Phone: 386-437-8747, Fax: 386-437-8737, Cell: 386-316-5904

> E-mail: [log in to unmask], Website: www.engelmaier.com

> 

> 

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