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History of D-sub connector footprints

J

Joel Kolstad

Jan 1, 1970
0
I got to thinking the other day... does anyone know why the standard D-sub
connectors (9 pins, 15, 25, 37, etc.) use pins that are 0.109" apart? Why
0.109"? That's just enough that I've seen people try to use the parts on 0.1"
spaced pads, and with enough effort I've even seen them succeed. :)

---Joel Kolstad
 
B

Boris Mohar

Jan 1, 1970
0
I got to thinking the other day... does anyone know why the standard D-sub
connectors (9 pins, 15, 25, 37, etc.) use pins that are 0.109" apart? Why
0.109"? That's just enough that I've seen people try to use the parts on 0.1"
spaced pads, and with enough effort I've even seen them succeed. :)

---Joel Kolstad

If you look carefully you will notice that 9 pin ones are 0.108" I have
over a hundred D connectors in my library and still have to make new ones.
There are lot of subtle variations between manufacturers.



Regards,

Boris Mohar

Got Knock? - see:
Viatrack Printed Circuit Designs (among other things) http://www.viatrack.ca

void _-void-_ in the obvious place
 
P

Pete

Jan 1, 1970
0
I'm in need of a little help in verifying the pin layout of an IRF9610.
I downloaded the IR data sheet but it doesn't specify witch lead is
which.
Package is TO-220AB. From past experience with power MOS FET, with the
front facing you, it is from left to right GDS, but I need to be sure
because I don't want to find out that it's the other way around when it
tries to switch 117 VAC @ half an amp.

Thanks Pete
 
R

Ross Herbert

Jan 1, 1970
0
I'm in need of a little help in verifying the pin layout of an IRF9610.
I downloaded the IR data sheet but it doesn't specify witch lead is
which.
Package is TO-220AB. From past experience with power MOS FET, with the
front facing you, it is from left to right GDS, but I need to be sure
because I don't want to find out that it's the other way around when it
tries to switch 117 VAC @ half an amp.

Thanks Pete

You can take it for granted that the pin arrangement will be G - D - S
left to right looking at the package from the front side.

Here is a Nelson Pass design which uses this device
http://www.passdiy.com/pdf/balzenpre.pdf
See page 6 for parts layout of pcb.
 
F

Franc Zabkar

Jan 1, 1970
0
I'm in need of a little help in verifying the pin layout of an IRF9610.
I downloaded the IR data sheet but it doesn't specify witch lead is
which.
Package is TO-220AB. From past experience with power MOS FET, with the
front facing you, it is from left to right GDS, but I need to be sure
because I don't want to find out that it's the other way around when it
tries to switch 117 VAC @ half an amp.

Thanks Pete

http://www.nteinc.com/specs/2300to2399/NTE2372.html
http://www.nteinc.com/graphics/diag11b.gif

- Franc Zabkar
 
R

Roger Hamlett

Jan 1, 1970
0
Joel Kolstad said:
I got to thinking the other day... does anyone know why the standard
D-sub connectors (9 pins, 15, 25, 37, etc.) use pins that are 0.109"
apart? Why 0.109"? That's just enough that I've seen people try to use
the parts on 0.1" spaced pads, and with enough effort I've even seen them
succeed. :)
I seem to remember a story that it was a drafting mistake!. The draftsman
setting out one of the original connectors, allowed 1.3", for 13 pins.
Forgetting that there is one less 'gap', than the pin number. This then
gives 0.10833" per pin, which seems to be 'right'...

Best Wishes
 
B

bob hoffman

Jan 1, 1970
0
I got to thinking the other day... does anyone know why the standard
D-sub connectors (9 pins, 15, 25, 37, etc.) use pins that are 0.109"
apart? Why 0.109"? That's just enough that I've seen people try to
use the parts on 0.1" spaced pads, and with enough effort I've even
seen them succeed. :)

---Joel Kolstad

These connectors were designed many years ago. .109 is 7/64".
 
J

Joel Kolstad

Jan 1, 1970
0
bob hoffman said:
These connectors were designed many years ago. .109 is 7/64".

Hmm... the thread regarding "Why are PCBs 62.5 mils thick?" suggests that
"years ago" it would have been atypical to use fractions smaller than a 32nd?
I'll keep your explanation in mind... although I'd have to say I'm almost
wishing the bit about "the draftsman for a DB-25 mistakenly draw 1.3" end to
end," is true, due to its more colorful quality. :)
 
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