Hi Paul,
I have been searching through my old paper files and found one of the
documents that confirms my initial statement.
Please refer to Alcatel document No. 1AA 00017 0000 ASZZA
Sections 10.2 through to 10.3 which cover the position of Pin 1,
polarization and orientation of SMD components.
If you would like further assistance please don't hesitate to ask.
Cheers,
Barry
Paul Arklay wrote:
>
> Jack,
>
> Yes I'm new.
>
> I am not attacking this person. I am simply pointing out that when people
> are looking for help that they don't need generalisations which could be
> misleading. I thought the idea of this forum was to present up to date
> relevant guidelines.
>
> Ok maybe to you I came across as being a bit harsh but I simply was asking
> for some clarification on Barry's comments.
>
> Best Regards
> Paul Arklay
>
> -----Original Message-----
> From: Olson, Jack C <[log in to unmask]>
> To: DesignerCouncil E-Mail Forum. <[log in to unmask]>; Paul Arklay
> <[log in to unmask]>
> Date: 24 September 1998 10:54
> Subject: RE: [DC] Jedec standard EIA-JED-95 not relevant for smt polarised
> components?
>
> >Chill out....
> >
> >There IS a standard that explains how components are loaded onto reels,
> >EIA-214 or something, I'll check when I get home.
> >
> >(but I don't know why you attack ONE PERSON in a DISCUSSION for not
> >providing the exact answer that YOU PERSONALLY want to get. Are you new?)
> >
> >
> > -----Original Message-----
> > From: Paul Arklay [SMTP:[log in to unmask]]
> > Sent: Wednesday, September 23, 1998 5:26 PM
> > To: [log in to unmask]
> > Subject: [DC] Jedec standard EIA-JED-95 not relevant for smt
> >polarised components?
> >
> > Hi Everyone,
> >
> > Barry Olney wrote:
> >
> > >We changed our component orientation, years ago, to pin 1 - top
> >right in
> > >order to comply with our European technology partners.
> >
> > Who is "we" ?
> >
> > Was this ever published as a standard by a governing body?
> >
> > Which European technology partners?
> >
> > It great to generalise about something that supposedly occurred
> >years ago
> > but how about some facts.
> >
> > >There are many Jedec standards at URL http://www.jedec.org I
> >thought
> > >the issue in question was covered in the EIA-JED-95 standard?
> >
> > I have looked at this standard on Barry's recommendation and cannot
> >see that
> > it covers this issue at all. It is a mechanical standard for
> >component
> > outlines and does not include all polarised components anyway.
> >
> > It's great to quote standards but one should see if they are
> >relevant to
> > this issue first.
> >
> > As far as I can see there is not an official standard for this issue
> >and the
> > industry has therefore created its own default standard with pin1 to
> >the
> > bottom left as seen in the majority of responses to my original
> >question
> > which was sent also to the Mentor Uers Group and Cooper and Chyan
> >Technology
> > user group.
> >
> > Best Regards,
> > Paul Arklay
> >
> > Paul Arklay
> > PCB Design Engineer
> > JTEC Pty Limited
> > Unit 3 118-122 Bowden Street
> > Meadowbank NSW 2114
> > Australia
> > Direct +61 2 93900622
> > Fax +61 2 93640055
> > Switch +61 2 98096933
> > Email: [log in to unmask]
> >
> >
> > Barry Olney wrote:
> >
> > >You are right Jack in that we need to create our libraries and use
> > >design rules to suit the end process.
> > >
> > >We changed our component orientation, years ago, to pin 1 - top
> >right in
> > >order to comply with our European technology partners.
> > >
> > >There are many Jedec standards at URL http://www.jedec.org I
> >thought
> > >the issue in question was covered in the EIA-JED-95 standard?
> > >
> > >Cheers,
> > >
> > >Barry Olney
> > >
> > >Olson, Jack C wrote:
> > >>
> > >> Well, SOMEONE is missing the point.... <grin>
> > >>
> > >> Yes, you can create stuff any way you like, but since he has a
> >CHOICE
> > what
> > >> orientation to build them, and since it doesn't matter to the CAD
> > operator
> > >> what orientation they are, it seems logical and intelligent to
> >wonder if
> > the
> > >> ASSEMBLER might have a preference, eh?
> > >>
> > >> If you build a library component and plop it into your design,
> >and don't
> > >> rotate it, at the end of the design cycle when you create your
> >pick and
> > >> place files for the assembler, that component will be listed as
> >zero
> > degrees
> > >> rotation, right? If you build a SMT resistor vertically, no
> >matter how
> > you
> > >> rotate it in the database, the rotation in the data file will be
> >useless
> > >> because SMT resistors are packaged horizontally on a reel. The
> >operators
> > >> know this, so they check rotations before they start, but
> >wouldn't it be
> > >> nice if we could get MOST OF THEM right in the library? Sometimes
> >you
> > can't
> > >> because some ICs come on reels horizontally, and some come
> >packaged in
> > >> sticks and come out vertically, so you have to modify some
> >rotations no
> > >> matter what. But all I am saying is that if you know what your
> >vendor is
> > >> using, why not make it easy for him and TRY to supply good data?
> > >>
> > >> Still, you can never win... here at Intel we are asked NOT to
> >place
> > >> components in the same orientation as they come on the reel,
> >because the
> > >> type of pick-and-place machine we use rotates the head 180
> >degrees as it
> > is
> > >> moving from the reel to the board, and then will have to rotate
> >another
> > 180
> > >> to get back to the same orientation, which wastes a whole tenth
> >of a
> > second
> > >> (perish the thought!). So, you can never learn enough in this
> >business,
> > >> right?
> > >>
> > >> Onward thru the fog, Jack
> > >>
> >
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--
__________________________________________________________________
Barry Olney http://www.icd.com.au
Managing Director
In-Circuit Design Pty Ltd
VeriBest Solutions Centre
Level 1, Princess Tower PO Box 362, Robina Business Centre
1 Princess Street, Unit 34/24 Ron Penhaligon Way,
Kew, VIC 3101, Australia Robina, Qld 4226, Australia
Ph: +61 3 9205 9595 Ph: +61 7 5562 0075
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__________________________________________________________________
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