"a lot" is kind of vague isn't it?! This may help...
a lot = approx. 10W (that's a lot for my designs)
I am mounting a 24 pin surface mount IC to the PCB.
The entire bottom of the IC is metal for heat sinking.
The ceramic PCB would be a 10 pin SIP(space reasons), soldered to a
board in an aluminum enclosure(6x3x4). My original idea was to attach
a heatsink to the opposite side of the SIP. The enclosure is sealed, and
I cannot directly heatsink the SIP to the enclosure. I just need to get the
heat away from the IC(obviously).
I am researching the ceramic option only because the temperature was
very near the limit of FR-4. I am not sure what the cost of the ceramic
may be compared to specifying a higher temp substrate.
Thanks,
Joe
> ----------
> From: Kotecki, George[SMTP:[log in to unmask]]
> Sent: Wednesday, November 11, 1998 12:38 PM
> To: DesignerCouncil E-Mail Forum.; Joe Reichert
> Subject: RE: [DC] Ceramic PCBs
> Importance: High
>
> Joe,
> There isn't enough information supplied to make any solid
> recommendations. For example how much power is A LOT? Also, where in the
> assembly is this PWB? Is it in a card cage or mounted to a chassis frame?
> What is the operating environment? What type of devices are you mounting
> (TO-3, TO-220, bare chips, etc)? Answers to these questions will help you
> decide on an approach.
>
> Regards,
>
> George Kotecki
>
> > ----------
> > From: Joe Reichert[SMTP:[log in to unmask]]
> > Reply To: DesignerCouncil E-Mail Forum.;Joe Reichert
> > Sent: Wednesday, November 11, 1998 11:25 AM
> > To: [log in to unmask]
> > Subject: [DC] Ceramic PCBs
> >
> > Hello all,
> >
> > I am looking for any information on ceramic PCB's.
> > Manufacturers, cost vs. FR-4, suggestions, CAUTIONS, etc.
> > My application is a high voltage power driver that dissipates
> > A LOT of power. I am looking to mount the driver on a surf
> > board. This surf board is what I am interested in making
> > ceramic instead of FR-4. Any suggestions are greatly
> > appreciated.
> >
> > Thanks,
> > Joe
> >
> > (2 more days 'til Friday)
> >
> > :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> > Joe Reichert
> > Lake Shore Cryotronics, Inc.
> > 575 McCorkle Boulevard
> > Westerville, OH 43082
> > Voice: 614-891-2243 x238 Fax: 614-818-1605
> > E-mail: [log in to unmask]
> > Visit our web site @ http://www.lakeshore.com
> >
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