Re: [SI-LIST] : Seeking information about heatsink.

jrbarnes@lexmark.com
Fri, 11 Jun 1999 09:02:17 -0400

>We met thermal problem with a board of above 40MHz. It's a signal
>processing unit of our microwave radio. We need some heatsinks for
>QPFQ160 and PLCC44 packages, perhaps we'll need heatsinks with fan. We
>can't find a vendor with this kind of product.

Check out Chomerics THERMATTACH T-Wing(R) heat spreaders at
http://www.electronic-service.de/twing.htm

Standard parts are:
* 60-12-20264-TW10 2.0" (50.8mm) x 0.5" (12.7mm) with a 0.5" x 0.5"
adhesive patch in the center.
* 60-12-20265-TW10 3.0" (76.2mm) x 0.5" (12.7mm) with a 0.5" x 0.5"
adhesive patch in the center.
* 60-12-20266-TW10 3.0" (76.2mm) x 0.75" (19.1mm) with a 0.75" x 0.75"
adhesive patch in the center.
* 60-12-20267-TW10 3.0" (76.2mm) x 1.0" (25.4mm) with a 1.0" x 1.0"
adhesive patch in the center.
* 60-12-20268-TW10 4.0" (101.6mm) x 1.0" (25.4mm) with a 1.0" x 1.0"
adhesive patch in the center.
* 60-12-20269-TW10 4.0" (101.6mm) x 1.5" (38.1mm) with a 1.5" x 1.5"
adhesive patch in the center.

Custom configurations are also available.

T-Wings(R) consist of soft 5 oz (0.007" = 0.178mm) copper sheet with insulating
film laminated on both sides and a patch of high-thermal-conductivity adhesive
on one side. For best results, clean the top of the chip that you want to
heatsink with a mild solvent. Then pull the cover strip off the T-Wing(R) , set
the adhesive patch on top of the chip, and push the T-Wing(R) down with your
thumb or a wooden stick. Bend the wings into whatever shape you want, for
clearance with other components or to fit the available space, and you are done.

Flomerics has an application note about them at
http://www.flotherm.com/Reflib/App108/App108.htm

We've been using them on printer controller boards and network attach cards for
a couple of years now, and they work very well. We engineers like them because
they are effective, inexpensive, versatile, and very easy to try out.
Manufacturing likes them because they don't have to fuss with clips or messy
thermal grease.
John Barnes Advisory
Engineer
Lexmark International

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