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Subject:	Re: PCB layer registration question
From:	Lee parker <[log in to unmask]>
Reply To:	TechNet E-Mail Forum <[log in to unmask]>, Lee parker <[log in to unmask]>
Date:	Wed, 15 Jun 2005 22:49:23 -0400
Content-Type:	text/plain
Parts/Attachments:	text/plain (49 lines)

Peter

The innerlayer registration is normally a measure of how well the drilled hole is registered to the pad or anti-pad. The purpose of the requirement is to insure that the barrel of the drilled hole is always some predetermined distance (an isolation guard band) from any adjacent active feature on that innerlayer. Consequently, what is an acceptable registration is determined by requiring the registration to guarantee that the isolation guard band is not invaded. The requirement is really for you and the designer to set not the supplier

Best regards

Lee

J. L. Parker Ph.D.
JLP Consultants LLC
(804) 779 3389

  ----- Original Message ----- 
  From: Peter Lee<mailto:[log in to unmask]> 
  To: [log in to unmask]<mailto:[log in to unmask]> 
  Sent: Wednesday, June 15, 2005 7:04 PM
  Subject: [TN] PCB layer registration question


  Technet,

  I am looking for an acceptance criteria on PCB layer-to-layer registration. The pcb is 4 layer and 8x4". I was informed by our PCB vendor that they can conform to +/-0.005" and the pass/fail gate is no annular ring breakout. Can someone please confirm?



  Rgds,

  Peter

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