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. 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