Students at our center have used a combination of plasma and laser to
extract RF devices successfully from molded packages for reuse in alternate
configurations. The method can equally be used for failure analysis. Paper
by one of them is included in the 2009 ECTC, "A Unique Application of
Decapsulation Combining Laser and Plasma," Jason Thomas, Jacob Baer, Philip
Westby, Kevin Mattson, Frederik Haring, Greg Strommen, John Jacobson, Syed
Sajid Ahmad, Aaron Reinholz; 2009 ECTC, May 25-30, 2009, San Diego, CA. This
paper has numerous useful references for additional investigation.
As for the wet etch, I am not sure what would work on GaAs. Nitric is chosen
to replace sulfuric which is slow and thus damaging to Al but I remember
that additives to the solution could passivate Al to allow decap of the
polymers. This was in the 80s.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bev Christian
Sent: Thursday, June 18, 2009 7:52 AM
To: [log in to unmask]
Subject: Re: [TN] laser decap machine
Not sure of the AMOUNT, but it looks like decomposition of gallium
arsenide MAY lead to arsine production. Nasty stuff. It is the subject
of great debate (well among a very small group of people :) ) as a
contributing factor, if not the factor, to the death of Napoleon. One
theory is that in the moist environment of St Helens that microbes
decomposed the arsenic containing paint inside his house on the island
and produced arsine which lead to his death.
And, no, I am on in no way inferring that I should become unemployed by
favoring the elimination of gallium arsenide from use in
telecommunications.
One reference I found quickly, but have not actually read:
Reaction of Gallium Arsenide with Concentrated Acids: Formation of
Arsine
Nelson Scott; Dean E. Carter; Quintus Fernando
American Industrial Hygiene Association Journal, 0002-8894, Volume 50,
Issue 7, 1989, Pages 379 - 381
Bev
RIM
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Hernefjord Ingemar
Sent: Thursday, June 18, 2009 8:34 AM
To: [log in to unmask]
Subject: Re: [TN] laser decap machine
maybe gollum assenide ?
Inge
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steven Creswick
Sent: torsdag 18 juni 2009 14:23
To: [log in to unmask]
Subject: Re: [TN] laser decap machine
Wayne,
Thanks for the info. I would not have guessed that!
Probably gives off some even nastier gases!!!
Steve
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Thayer, Wayne
Sent: Thursday, June 18, 2009 8:20 AM
To: [log in to unmask]
Subject: Re: [TN] laser decap machine
Nitric eats GaAs. Surprised me too, but I'm not a chemist either.
Wayne Thayer
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steven Creswick
Sent: Thursday, June 18, 2009 6:55 AM
To: [log in to unmask]
Subject: Re: [TN] laser decap machine
Inge,
Virtually all of my GaAs experience had airbridges, so they were all
hermetic packages.
The fuming nitric should go after the organics only, so it shouldn't
affect the GaAs, should it?
Maybe the chemists amongst us could say for sure.
Steve
-----Original Message-----
From: Hernefjord Ingemar [mailto:[log in to unmask]]
Sent: Thursday, June 18, 2009 6:23 AM
To: TechNet E-Mail Forum; Steven Creswick
Subject: RE: [TN] laser decap machine
Depending on what you want to see, don't forget how good today's
finefocus etc are. Can see even migration dendrites on a chip. Well, you
need a lot of manipulation and experience.
Fuming acids...have you done many back-etchings? Did it work for GaAs ?
Inge
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steven Creswick
Sent: torsdag 18 juni 2009 11:42
To: [log in to unmask]
Subject: Re: [TN] laser decap machine
Ingemar - Joyce,
My limited experience with the eximer for ablation was that even though
the laser removed the organics, I still [understandably] had to deal
with the inorganics left behind - such as silica with a PEMs device.
Whether I blew it off, or washed/rinsed it off, it broke up a
potentially nice process a great deal. This was back in the olden days.
To some extent, each pulse would dislodge some of the filler ... but not
enough.
Possibly provisions have been made for this by now.
Still, it is better than smelly-messy Decap, or the hazards of fuming
nitric...
Steve
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0 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/contentpage.asp?Pageid=4.3.16 for
additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100
ext.2815
-----------------------------------------------------
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0 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/contentpage.asp?Pageid=4.3.16 for
additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100
ext.2815
-----------------------------------------------------
This e-mail and any files transmitted with it may be proprietary and are
intended solely for the use of the individual or entity to whom they are
addressed. If you have received this e-mail in error please notify the
sender.
Please note that any views or opinions presented in this e-mail are
solely those of the author and do not necessarily represent those of ITT
Corporation. The recipient should check this e-mail and any attachments
for the presence of viruses. ITT accepts no liability for any damage
caused by any virus transmitted by this e-mail.
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0 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/contentpage.asp?Pageid=4.3.16
for additional information, or contact Keach Sasamori at [log in to unmask]
or 847-615-7100 ext.2815
-----------------------------------------------------
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0 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/contentpage.asp?Pageid=4.3.16 for
additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100 ext.2815
-----------------------------------------------------
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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/contentpage.asp?Pageid=4.3.16 for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100
ext.2815
-----------------------------------------------------
---------------------------------------------------------------------
This transmission (including any attachments) may contain confidential
information, privileged material (including material protected by the
solicitor-client or other applicable privileges), or constitute non-public
information. Any use of this information by anyone other than the intended
recipient is prohibited. If you have received this transmission in error,
please immediately reply to the sender and delete this information from your
system. Use, dissemination, distribution, or reproduction of this
transmission by unintended recipients is not authorized and may be unlawful.
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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/contentpage.asp?Pageid=4.3.16
for additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100 ext.2815
-----------------------------------------------------
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
|
