0805 size high power resistors, 250mW ok on FR-4? - sci.electronics.design

Message from discussion 0805 size high power resistors, 250mW ok on FR-4?

Joerg

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More options Jul 24, 12:59 am

Newsgroups: sci.electronics.design, sci.electronics.components

From: Joerg <notthisjoerg...@removethispacbell.net>

Date: Wed, 23 Jul 2008 09:59:26 -0700

Local: Thurs, Jul 24 2008 12:59 am

Subject: 0805 size high power resistors, 250mW ok on FR-4?

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Hello All,

Got a circuit where in hindsight the client decided they need >10 times
the juice than initially spec'd. This was truly unforeseen for them and
we have to make it work at least for a proto series. Of course, now all
those 0805 resistors in the power path would exceed their usual 1/8W
spec. Found these at 1/3W:

http://www.susumu.co.jp/english/pdf/products-j01-07.pdf

I plan to run them around 200-250mW. Was expecting those to be really
tall to vent off some heat but they are surprisingly flat, only 0.4mm
high. Will this become a heat problem on FR-4 for stuff that can run
24/7? Any experience?

--
Regards, Joerg

http://www.analogconsultants.com/

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