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October 1999

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Subject:
From:
Ken Patel <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 18 Oct 1999 12:16:52 -0700
Content-Type:
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text/plain (74 lines)
Our product goes into Digital Video Broadcasting Industry where high
reliability is required. Nobody like their TV going blank. Here we are
talking about thousands of angry customers. Hence, we ask for class 3
reliability.

re,
ken patel

 At 12:08 PM 10/18/1999 -0700, Dave Hoover wrote:
>Ken,
>If the microBGA has microvias think about the "Z" axis
>expansion. The PCB would see far more "Z axis" expansion
>for a through hole as opposed to a microvia(Proportionately
>speaking). Class 3 criteria generally is for life support,
>super high rel (space to the desert in one final swoop),
> ...etc. I do believe the annular ring callouts were
>based on round robin testing of actual test samples.
>So where does your product fit in? Class 2 or class 3?
>
>Groovster
>-----Original Message-----
>From: Ken Patel [mailto:[log in to unmask]]
>Sent: Monday, October 18, 1999 11:52 AM
>To: [log in to unmask]
>Subject: [TN] Annular ring requirement by IPC
>
>
>I have the basic question:
>Why do we need annular ring on inner layers? If the answer is no then why
>IPC is asking for 1 mil annular ring on Class 3 products. The problem arisen
>due to microBGA application.
>
>re,
>ken patel
>______________________________________________________
>Ken Patel                       Phone:  (408) 490-6804
>1708 McCarthy Blvd.             Fax:    (408) 490-6859
>Milpitas, CA 95035              Beeper: (888) 769-1808
>
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______________________________________________________
Ken Patel                       Phone:  (408) 490-6804
1708 McCarthy Blvd.             Fax:    (408) 490-6859
Milpitas, CA 95035              Beeper: (888) 769-1808

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