Terri,
The nail head pin which you describe sounds very much like what us "hybrid"
users would find in a bath-tub, or 'stamped' package. Unfortunately for
glass/metal sealed packages such as this, they are plated after the glass
sealing operation so they are not likely to be of great use to you (in the
unplated state). First two sites.
http://www.sinclairmfg.com/
http://www.olinaegis.com/
Your thoughts of checking with PGA manufacturers is good. Check with these
for PGA package pins. They will be plated prior to brazing (soldering for
Amkor) to the package. The hard part may be in finding just exactly who to
talk to, to get what you want, due to their large size. You could also
check out a few others that make laminate-based PGA's
http://www.kyocera.com/Kai/semiparts/Products/aln.htm
http://generalceramics.com/
http://www.amkor.com
The nail-head pins are typically made from Alloy 42, or kovar - so if not
plated, they can rust. If you look for nail-heads for power packages, they
will be OFHC copper, but also typically much larger in diameter.
As a word to your processing people. The closer the nail-head is to the
'substrate/solder joint' the more ultrasonically stable it will be = less
grief bonding to it.
Fine wire bonding (<2 mil diameter gold or aluminum) to 18 mil dia leads
with nail-heads more than 25-35 mils above the mounting braze, glass, or
solder is problematic. Get the head as low to the solder joint as possible
(without getting it INTO the solder). Make sure all condensed volatiles are
removed from the heads for more consistent bond results.
Heavy wire bonding (>3-20 mil dia aluminum) to an 18 mil dia lead & nail
head will essentially not be possible, due to the pin being far to unstable
during the bonding cycle (unless the underside of the nail head is in
contact with
the solder - just make sure the solder does not wrap around the nail head to
the top-side of the nail.
Hope this has been of some assistance.
Steven Creswick - Gentex Corporation
-----Original Message-----
From: Houston, Terri [mailto:[log in to unmask]]
Sent: Friday, March 08, 2002 10:11 AM
To: [log in to unmask]
Subject: [TN] Looking for 18-mil-diameter, gold-plated, nail-head pins
Hi folks - happy Friday,
We have an assembly "situation" that can be solved by using an 18-mil gold
pin, which we plan to wirebond to its top--so we're looking for a nailhead
design with gold plating. It can be anywhere from 1/4 to 1/2" in length.
Our thought was to go to the folks making pin grid arrays to see if we can
buy/get some (only need about 100 or so), but no luck.
Any sources for such pins would be gratefully appreciated.
Thanks in advance,
Terri
Terri Houston
ATK
Clearwater, FL
----------------------------------------------------------------------------
-----
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 e-mail to [log in to unmask]: SET
Technet NOMAIL
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
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
----------------------------------------------------------------------------
-----
---------------------------------------------------------------------------------
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 e-mail to [log in to unmask]: SET Technet NOMAIL
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
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
---------------------------------------------------------------------------------
|
