Truly Nolan is more like it.
Dewey
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gary Robinson
Sent: Thursday, June 26, 2008 10:58 AM
To: [log in to unmask]
Subject: Re: [TN] Power amplifier growth
Truly Incredible!
On Thu, Jun 26, 2008 at 8:50 AM, Steve Gregory
<[log in to unmask]>
wrote:
> Thanks Inge! I try hard.
>
> Maybe it's because I stay connected most of the time:
>
> http://stevezeva.homestead.com/files/Staying_Connected.jpg
>
> Steve
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Hernefjord Ingemar
> Sent: Thursday, June 26, 2008 7:39 AM
> To: [log in to unmask]
> Subject: Re: [TN] Power amplifier growth
>
> Thanks, Steve,
> you are the most available person I've ever met! In most cases, the
> person I call or mail to, is out of office, on vacancies, on meeting,
> not reading daily, answering sporadically etc.
> You are unique.
>
> Inge
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
> Sent: den 26 juni 2008 14:03
> To: [log in to unmask]
> Subject: Re: [TN] Power amplifier growth
>
> The pidgeon has landed, and left a big poop. You can see the MES he
made
> here:
>
> http://stevezeva.homestead.com/files/Strange_Growth.jpg
>
> Steve
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Hernefjord Ingemar
> Sent: Thursday, June 26, 2008 2:24 AM
> To: [log in to unmask]
> Subject: Re: [TN] Power amplifier growth
>
> I'll send a pidgeon to Mr Gregory
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Guy Ramsey
> Sent: den 26 juni 2008 03:06
> To: [log in to unmask]
> Subject: Re: [TN] Power amplifier growth
>
> yes
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge
> Sent: Wednesday, June 25, 2008 2:28 PM
> To: [log in to unmask]
> Subject: Re: [TN] Power amplifier growth
>
> Do you want to see this phenomenon in an earlier state? I made some
> investigations on MESFETs with this issue.
> /Inge
>
>
> ----- Original Message -----
> From: "Wenger, George M." <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Wednesday, June 25, 2008 5:10 AM
> Subject: Re: [TN] Power amplifier growth
>
>
> The transistor in your photograph is a Freescale 9
>
> Shawn,
>
> The transistor in your photograph is a Freescale 900MHz 60W RF Power
> MOSFET. The epoxy seal around the ceramic lid of the transistor
appears
> to be intact. Even if it wasn't there is nothing that is going to
leak
> out of the transistor package to cause the kind of growth seen in your
> photograph. The growth appears to be limited to the drain (i.e.,
> output) lead of the transistor. The bias of the drain lead is most
> likely 26 to 30VDC and there would also, as Ingemar pointed out lots
of
> RF current in this area. Do you know what solder paste was used to
> solder the power transistor? With the DC bias, high RF current and
high
> temperature one has the conditions to accelerate corrosion especially
if
> there are flux residues or other contaminates present. I'm assuming
> that you removed the lid from the power amplifier when it stopped
> working to take the photograph and it wasn't just sitting on your desk
> exposed. If it was something corrosive might have dropped on the
power
> transistor.
>
>
> Regards,
>
> George
> George M. Wenger
> Andrew Wireless Solutions
> Senior Principal FMA / Reliability Engineer 40 Technology Drive,
Warren,
> NJ 07059
> (908) 546-4531 (office) (732) 309-8964 (cell) [log in to unmask]
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Dave Elder
> Sent: Tuesday, June 24, 2008 3:55 PM
> To: [log in to unmask]
> Subject: Re: [TN] Power amplifier growth
>
> Thanks for the thoughts, Shawn.
> We are still investigating the source of the "growth".
> No, the transistor no longer works.
>
> Cheers, Dave
>
> Upton, Shawn wrote, On 25/06/2008 1:14 a.m.:
> > I wonder though if temp spiked suddenly, enough to cook the part but
> > not enough to heat up the PCB? Well, above what the PCB had already
> > been cooked--it does have some discoloration. I'm wondering about
> > sudden spike, then the transistor goes open circuit. Fast enough to
> > blow the guts out, but not long enough to discolor the pcb above and
> > beyond what it has already seen.
> >
> > Thermal compound and/or flux residue interacting with whatever
leaked
> > out of the power transistor when it went? Almost looks like is left
> > over in the oven when a pie (high in sugar) has a spillover.
> >
> > Lastly, just to verify: the transistor is bad, right? Or is it
still
> > working?
> >
> > Shawn Upton, KB1CKT
> > Test Engineer
> > Allegro MicroSystems, Inc
> > [log in to unmask]
> > 603.626.2429/fax: 603.641.5336
> >
> > -----Original Message-----
> > From: TechNet [mailto:[log in to unmask]] On Behalf Of Guy Ramsey
> > Sent: Tuesday, June 24, 2008 5:04 AM
> > To: [log in to unmask]
> > Subject: Re: [TN] Power amplifier growth
> >
> > Looks like less of a growth and more of transmogrification.
> > Looks like Q100 got pretty hot.
> >
> >
> > -----Original Message-----
> > From: TechNet [mailto:[log in to unmask]] On Behalf Of Dave Elder
> > Sent: Tuesday, June 24, 2008 1:01 AM
> > To: [log in to unmask]
> > Subject: [TN] Power amplifier growth
> >
> > Has anyone seen anything like this?
> > The growth is on a 100W power amplifier that has been sitting,
powered
>
> > up, under load, on a desk, for six months.
> >
> > Dave
> >
> > http://sites.google.com/site/taitpcb/
> >
> > ---------------------------------------------------
> > 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 email, including any attachments, is only for the intended
> addressee. It is subject to copyright, is confidential and may be the
> subject of legal or other privilege, none of which is waived or lost
by
> reason of this transmission.
> If the receiver is not the intended addressee, please accept our
> apologies, notify us by return, delete all copies and perform no other
> act on the email.
> Unfortunately, we cannot warrant that the email has not been altered
or
> corrupted during transmission.
>
=======================================================================
>
>
> ---------------------------------------------------
> 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
> -----------------------------------------------------
>
> No virus found in this incoming message.
> Checked by AVG.
> Version: 8.0.100 / Virus Database: 270.4.1/1516 - Release Date:
> 6/24/2008 7:53 AM
>
------------------------------------------------------------------------
> ----
> --------------------
> This message is for the designated recipient only and may contain
> privileged, proprietary, or otherwise private information.
> If you have received it in error, please notify the sender immediately
> and delete the original. Any unauthorized use of this email is
> prohibited.
>
------------------------------------------------------------------------
> ----
> --------------------
> [mf2]
>
>
> ---------------------------------------------------
> 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
> -----------------------------------------------------
>
> ---------------------------------------------------
> 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
> -----------------------------------------------------
>
> ---------------------------------------------------
> 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=4.3.16for 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
-----------------------------------------------------
|
