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October 2001

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Subject:
From:
"<Peter George Duncan>" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 11 Oct 2001 11:13:06 +0800
Content-Type:
text/plain
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text/plain (84 lines)
It is possible to treat the heatsink as another PCB layer to be pressed to
the rest of the board using pre-preg. If you need the heatsink to be
electrically conductive, don't anodise it, but rather alchromate it
instead, but still watch how thick you allow the alchromation to get, as it
will also increase electrical resistance. It doesn't matter if it's just
thermal conductivity you want, or even just mechanical stiffness, but you
will have to passivate the aluminium surface somehow, though.

Talk to your fab house. My old slave pit in the UK did this with PTH
technology boards many years ago to provide heatladders for
conduction-cooled boards.

Peter Duncan




                    William Sullivan
                    <wsullivan@LUMINE        To:     [log in to unmask]
                    NTINC.COM>               cc:     (bcc: DUNCAN Peter/Asst Prin Engr/ST
                    Sent by: TechNet         Aero/ST Group)
                    <[log in to unmask]>        Subject:     [TN] bottom side heat sink attachment


                    10/11/01 01:48 AM
                    Please respond to
                    "TechNet E-Mail
                    Forum."






Hello Tec Netters,,,

        Is there anyone out there that can point me in the right
direction to fabricating a bottom side aluminum heat sink that is part
of the pcb itself,,  im really looking for process of attachment and
cost escalation.

                                Thanks Bill Sullivan

William Sullivan C.I.D
SR. PCB Design Engineer
Luminent Inc
20550 nordhoff St.
Chatsworth CA, 91311
818-773-9044 EX 2114

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