08-16-2013 06:10 AM
Hi,
I just want to know IPC-2221A/2222 convention for radial capacitors like CAPR1000-1300X650X1540 and also for different types of footprints in NI multisim.
Thank you.
10-03-2013 02:20 PM
Hi Mani,
Please have a look at some of these pages, I hope you find what you are looking for:
http://digital.ni.com/public.nsf/allkb/E81C051F276C5BE0862579E2006975D5
http://www.ni.com/white-paper/11669/en
http://222.184.16.210/smt/tzxt/bz/IPC-2222.pdf
08-13-2014 01:06 PM
Having looked at the links it's not quite clear to me what the convention is. My understanding is as follows e.g.:-
CAPPR 1000-2200X2500
CAP - CAPacitor
P - polarised or omitted if non polarised
R - Radial or A - Axial
Then I assume that a similar convention to
http://digital.ni.com/public.nsf/allkb/E81C051F276C5BE0862579E2006975D5
is followed so
1000 - would be centre to centre pin distance expressed as two significant digits in mm i.e. 10 mm in this case.
2200 - would be body radius expressed as two significant digits in mm i.e. 22 mm in this case.
2500 - would be body height i.e. up from the board surface, expressed as two significant digits in mm i.e. 25 mm in this case.
With a radial cap, it is difficult to see why these last two dimensions are different and so I am guessing at their interpretation. However, I'm not convinced I've got it right. I also note that some of the capacitors have the last number as e.g. 1250 i.e. not two significant figures.
I was hoping that someone could put me right.
Thanks
Tom