RE>>ASSY: TBGA's on "big boards" 4/18/97 With respect to the repair question: We haven't had any experience repairing TBGAs but will soon be into this, as we're building a PCI slot card with 2 CBGAs, 3 PBGAs, and 1 TBGA on it. Your question implies that such a repair process would differ from that for PBGAs and CBGAs (which we do now). Why should there be a significant difference? (Maybe I'm reading something into it....) With respect to the prebaking: The TBGAs that we're using are supposedly moisture-sensitive and require the same storage and prebaking precautions as our PBGAs. No word on the JEDEC classification on them. I don't know if these are representative of all other TBGAs. We've had a lot of trouble getting information from the package suppliers about TBGAs. In fact, we've been told up front that the packages will be PBGAs, but the TBGAs wind up being delivered to us. We ask for info regarding some basic things like moisture sensitivity, solder ball composition, basic assembly characteristics, reliability, and ruggedization needs, but wind up getting almost nothing in return. Regards, Greg Bartlett Mercury Computer Systems Chelmsford, MA [log in to unmask] -------------------------------------- Date: 4/18/97 11:05 AM To: Greg Bartlett From: Tom Cooper Dan, This is not an answer to your repair question, but an inquiry of my own. We are about to assemble some boards using TBGA's and was wondering if these packages require pre-baking as do PQFP's to remove moisture. In reading about TBGA technology, I find no mention of pre-baking or moisture sensitivity ratings. Please advise. Thank you in advance, [log in to unmask] ______________________________ Reply Separator _________________________________ Subject: TBGA's on "big boards" Author: [log in to unmask] at INTERNET Date: 4/17/97 11:21 AM we are currently building some 18" by 20" product with up to 4 500+ I/O TBGA's......The production process is ok....but we have some difficulty during repair....Preheat profile control is a critical parameter...does anyone have experience with TBGA repair on big boards? What repair platform should I investigate? thanks dan *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * *************************************************************************** *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * *************************************************************************** ------------------ RFC822 Header Follows ------------------ Received: by mailgate with SMTP;18 Apr 1997 11:03:50 -0400 Received: from charon.mc.com by mc.com (SMI-8.6/SMI-SVR4) id LAA18347; Fri, 18 Apr 1997 11:03:46 -0400 Received: from simon.ipc.org ([168.113.24.64]) by charon.mc.com (8.8.4/8.8.4) with SMTP id LAA28730; Fri, 18 Apr 1997 11:03:41 -0400 (EDT) Received: from ipc.org by simon.ipc.org via SMTP (940816.SGI.8.6.9/940406.SGI) id JAA03296; Fri, 18 Apr 1997 09:33:26 -0700 Resent-Date: Fri, 18 Apr 1997 09:33:26 -0700 Received: by ipc.org (Smail3.1.28.1 #2) id m0wIE0R-000Bj9C; Fri, 18 Apr 97 08:47 CDT Resent-Sender: [log in to unmask] Old-Return-Path: <[log in to unmask]> Date: Fri, 18 Apr 97 09:39:27 EST From: "Tom Cooper" <[log in to unmask]> Message-Id: <[log in to unmask]> To: [log in to unmask] Subject: Re: TBGA's on "big boards" Resent-Message-ID: <"SZRbV.0.p8C.UjtLp"@ipc> Resent-From: [log in to unmask] X-Mailing-List: <[log in to unmask]> archive/latest/12104 X-Loop: [log in to unmask] Precedence: list Resent-Sender: [log in to unmask] *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To subscribe/unsubscribe send a message <to: [log in to unmask]> * * with <subject: subscribe/unsubscribe> and no text in the body. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************