Ambient is non moving air and is the temperature that the component will
see right next to it's body.

I'm not sure what you mean by a standard test.  The component
manufacturers will guarantee their parts to the maximum/minimum rated
specifications listed on their datasheets.  Anything that is shown by a
graph or is listed as typical, is usually not tested.  In addition, when
you say IC that pretty much covers everything from digital to analog.
So one specification to cover all of those areas would be pretty tough.

Max Bernhardt
Component Engineer
Woodward  Governor Co.
 ----------
From: Hans Ohman
To: 'TechNet'
Subject: Component Rated Temperatures
Date: Thursday, May 15, 1997 11:57AM



Ive been reviewing a CCA that will be using commercial components at
elevated temperatures.  I've typically found that commercial ICs are
rated from 0 oC to 70 oC ambient temperature.

Does anyone have information on what "ambient" is? i.e. natural or
forced

convection

If forced convection, what air velocity, volume flowrate or mass
flowrate?

Is there a standard test used for rating components at 70 oC ambient and
if so, could someone direct me to where I can find information on that
test.

Thanks for the help.


Hans Ohman
DY4 Systems Inc.
[log in to unmask]

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