TECHNET Archives

June 2003

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Condense Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Content-type:
text/plain; charset=us-ascii
Sender:
Subject:
From:
Date:
Tue, 10 Jun 2003 07:46:01 +0800
MIME-Version:
1.0
X-To:
Carlr Ray <[log in to unmask]>
Reply-To:
"TechNet E-Mail Forum." <[log in to unmask]>, [log in to unmask]
Parts/Attachments:
text/plain (85 lines)
Hi, Carl,

Purely a personal bias, but I would change the BGA to an LCC or QFP, rather
than change the LCC to a BGA, especially if you ever plan to have to rework
the board. To me, all BGA's are a pain in the posterior when it comes to
replacement, when compared with other package types.

 Immersion Silver is good, or Immersion Tin, though I currently use ENIG
(may change this to ImAg or ImSn in future).

Peter



Carlr Ray <[log in to unmask]>     10/06/2003 06:32 AM
Sent by: TechNet <[log in to unmask]>

Please respond to "TechNet E-Mail Forum."; Please respond to Carlr Ray

              To:  [log in to unmask]
              cc:  (bcc: DUNCAN Peter/Asst Prin Engr/ST Aero/ST Group)
              Subject: [TN] LCC HASL and Immersion Silver








Hello All,
 Got a question for you guys....

I have a customer who has a product in design review. We provided
feedback with the following concerns. My question is what would you guys
recommend for an alternative surface finish if the customer does not
change parts?

1. PCB has 3 FPBGAs, 1.0 mm pitch (64 ball count) 12mm x 14mm package
2. PCB has 1 LCC, .5mm pitch (28 pins) 10mm x 10mm package
3. PCB has 4 QFPs, <.5mm pitch (28 - 204 pin count)
4. PCB has HASL finish

We have recommended changing the LCC to a BGA or QFP device and
changing the finish to Immersion Silver.

Carl Ray
Sr. Manufacturing Engineer
Huntsville, AL 35807
Phone: 256-882-4800 ext. 8845
Cell: 256-990-1990

---------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8e
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 or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/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
-----------------------------------------------------




[This e-mail is confidential and may also be privileged. If you are not the
intended recipient, please delete it and notify us immediately; you should
not copy or use it for any purpose, nor disclose its contents to any other
person. Thank you.]

---------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8e
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 or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/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
-----------------------------------------------------

ATOM RSS1 RSS2