Multisim and Ultiboard

cancel
Showing results for 
Search instead for 
Did you mean: 

IPC-2221A/2222 convention for capacitors

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.

0 Kudos
Message 1 of 3
(11,243 Views)

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

 

 

Tien P.

National Instruments
0 Kudos
Message 2 of 3
(11,081 Views)

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

Message 3 of 3
(10,329 Views)