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 Posted: Jun 20, 2012 - 11:58 PM |
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Joined: Mar 28, 2001
Posts: 20633
Location: Sydney, Australia (Gum trees, Koalas and Kangaroos, No Edelweiss)
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Please note: No personal opinions, just the standards references. 
I'm looking for the ISO or AS or AS/NZS standard for printed circuit assemblies, I'm sure there is one around but searching on the standards Australia website is just about useless.
In particular I'm after the paragraph(s) where it specifies minimum clearance between components.
I have been working with an older document for many years (before SMD??) and just need to check a couple of things. |
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John Samperi
Ampertronics Pty. Ltd.
www.ampertronics.com.au
* Electronic Design * Custom Products * Contract Assembly
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Posted: Jun 21, 2012 - 01:06 AM |
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Joined: Dec 30, 2004
Posts: 9009
Location: Melbourne,Australia
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| I think the IPC standards are more applicable in this instance. |
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Posted: Jun 21, 2012 - 03:20 AM |
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Joined: Oct 31, 2009
Posts: 165
Location: Vancouver, WA, USA
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Posted: Jun 21, 2012 - 04:20 AM |
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Joined: Mar 28, 2001
Posts: 20633
Location: Sydney, Australia (Gum trees, Koalas and Kangaroos, No Edelweiss)
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A link to a Russian website? 
IPC-7351 seems to discuss land patterns rather than what I need to know, minimum spacing between components.
I'm sure there is a AS/NZS covering this but can't get the correct search terms it seems.
As stated above I need a defintion from a recognised standard, all the better if AS/NZS.
I think I may have a page or 2 from that standard somewhere, if I can find I should be able to get the standard number.
By the way the document I have worked with up to now specifies a minimum 0.5mm spacing spacing between components, but as I said it's pretty old now. |
_________________
John Samperi
Ampertronics Pty. Ltd.
www.ampertronics.com.au
* Electronic Design * Custom Products * Contract Assembly
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Posted: Jun 21, 2012 - 05:54 AM |
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Joined: Mar 28, 2001
Posts: 20633
Location: Sydney, Australia (Gum trees, Koalas and Kangaroos, No Edelweiss)
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Found the pages and they are from IPC-A-610A  which seems to be superseded by rev D??
It seems the word I should use is clearance rather than spacing but the above document doesn't seem to address that, everything else but.  |
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John Samperi
Ampertronics Pty. Ltd.
www.ampertronics.com.au
* Electronic Design * Custom Products * Contract Assembly
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Posted: Jun 21, 2012 - 06:29 AM |
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Joined: May 02, 2007
Posts: 3154
Location: Nieuwegein, Netherlands
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Posted: Jun 21, 2012 - 08:40 AM |
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Joined: Mar 28, 2001
Posts: 20633
Location: Sydney, Australia (Gum trees, Koalas and Kangaroos, No Edelweiss)
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Must be going blind  can't see a definitive answer.
I guess the electrical clearance is the one to consider. SMD components have pretty much bare metal leads.
A TH component like a resistor which has a coating all along the body may need a different miminum spacing\clearance.
Never had any issues with boards assembly myself and will keep on using my old reference I guess. It has worked well but it seems very conservative. |
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John Samperi
Ampertronics Pty. Ltd.
www.ampertronics.com.au
* Electronic Design * Custom Products * Contract Assembly
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Posted: Jun 21, 2012 - 09:39 AM |
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Joined: May 02, 2007
Posts: 3154
Location: Nieuwegein, Netherlands
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The things we see most are that were hand soldered components meet SMD components the factory requests a minimum spacing.
for SMD to SMD we have never received any change requests.
For your info we have a 10mil component spacing rule.
Also note that when reworking you want to have some space to put tweezers in that will probably be the most important rule for yourself. |
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1)Datasheet and application notes checked?
2)tutorial forum
3)Newbie start here
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Posted: Jun 21, 2012 - 06:44 PM |
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Joined: Apr 25, 2004
Posts: 3817
Location: Denmark
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js wrote:
Must be going blind can't see a definitive answer.
@js
It has been known for years ...
It's 42
/Bingo |
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Posted: Jun 21, 2012 - 11:23 PM |
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Joined: Mar 28, 2001
Posts: 20633
Location: Sydney, Australia (Gum trees, Koalas and Kangaroos, No Edelweiss)
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Quote:
we have a 10mil component spacing rule.
That's about 0.25mm while the document I have worked with states 0.5mm (~0.2mil).
But then again that document specified miminum 12mil tracks while 10,8 or smaller are common nowdays. |
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John Samperi
Ampertronics Pty. Ltd.
www.ampertronics.com.au
* Electronic Design * Custom Products * Contract Assembly
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