By those definitions, option 3 would be the smallest, since
.005" holes have been drilled for years.   I see the dilemma.

Gary McCauley
PC Boards, Inc

-----Original Message-----
From: Ray Humphrey [mailto:[log in to unmask]]
Sent: Tuesday, April 03, 2001 9:38 AM
To: [log in to unmask]
Subject: Re: [TN] Low Aspect Via definition


Michael,

I have found that getting a straight, definitive answer to questions like
yours is almost impossible.  I went through the same exercise trying to get
the definition of a micro via.  After doing extensive research and talking
to a lot of PCB fabricators, I came up with the following:

1. Any via with a hole < .008"
2. Any via with a hole < .006"
3. Any via with a hole too small to be mechanically drilled, usually blind.

Since it appears to be a moving target, I settled on number 3.


Best regards,

Ray Humphrey
Senior PCB Designer
Maxim Integrated Products

---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------