nuckolls.bob(at)aeroelect
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 Posted: Wed Jan 28, 2009 2:10 pm Post subject: D-Sub contact ratings. |
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| Quote: | Looking at your mini-bus creation using d-sub, can you give me an idea how
many amps can I put thru those d-sub pins ( I guess is a better question is
what are each of the pins rated for)??...obviously, I looking at using18-22
awg wire..probably no higher than 5 amps, but maybe as high as 7.5 amps if
possible. |
Any single pin is limited to no larger than 20AWG wire and 7.5A at
25C ambient. I've run as much as 25A on any single set of wires
by paralleling pins and leaving at least 12" of 22AWG wire in series
with each pin to add "ballasting" resistance . . . to force sharing
of the load across an array of paralleled pins.
So if you wanted to run say 10A on an 18AWG wire through the
d-sub, splice into two to three 22AWG pigtails and then drop
the pigtails into the pins. See:
http://www.aeroelectric.com/Pictures/Connectors/D-Subminature/Paralleled_D-Sub_Pins.jpg
I did a solid state power distribution controller . . .
http://aeroelectric.com/Pictures/Misc/GQM_Power_Dist.jpg
for a super-sonic target
http://aeroelectric.com/Pictures/Misc/GQM_1st_Ops_Flight.jpg
that used this paralleling technique. It was tested to
the full suite of environmental conditions unique to
this target. In this case, one connector was an ECB
board version so the whole 12" length of ballasting
wire was on one side.
For a 25-pin connector I'd recommend de-rating
current loading by 50% or say 3.7 amps per
pin. You probably won't have many situations where
you need to run 18 or 16 awg wires through the
connector so 2 or at the most 3 paralleled pins
should cover you nicely on these circuits.
Bob . . .
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( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
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[quote][b]
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