970 ipc 2221 results

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PCBA Standards

Electronics Forum | Wed Jul 07 17:47:00 EDT 2004 | davef

For bare board design for test, try: * IPC-2221 - Generic Standard On Printed Board Design * Section standard for the board type [eg, IPC-2222 - Sectional Design Standard For Printed Board For Organic Printed Boards]

Gold coated spring contacts

Electronics Forum | Tue May 22 18:21:15 EDT 2001 | davef

Again not quite what your looking for, but close, consider IPC-2221, Generic Standard On Printed Board Design, Para. 4.4.4 for minimum requirements for edge board connectors, as a baseline.

soldering and bonding on gold PCB's

Electronics Forum | Wed Jan 09 17:03:44 EST 2002 | rob_thomas

We follow IPC-2221 recommendations for Au and don't have a problem as long as the Ni is under 150 microinches.This ensures a consistent process for us.Also we do plasma clean after SMt and prior to wirebond.That makes a big difference. Rob

enig

Electronics Forum | Sat Oct 15 15:57:11 EDT 2005 | GS

Organic Solderability Preservative, is a definition that you can find, for istance, on IPC-2221A (geneiric standard on printed board design) Tabel 4-3 (Final Finisch, etc) Regards............GS

Conductor or Trace Spacing

Electronics Forum | Wed Jul 06 20:40:40 EDT 2005 | davef

Voltage does not flow. Current flows as a result of a change in voltage. Current capacity of traces * Graph is IPC-2221 paragraph 6.2, Figure 6.4 * http://www.geocities.com/CapeCanaveral/Lab/9643/TraceWidth.htm

Solder Paste Inspection

Electronics Forum | Fri Feb 02 08:22:10 EST 2007 | davef

Try: * IPC-2221, 5.4.3 Datum Features * http://www-ese.fnal.gov/ese-dfe/SMEMA%20fiducial%20mark%20standard.pdf

Component Staking

Electronics Forum | Wed Oct 07 11:42:02 EDT 2015 | davef

IPC2221 Generic Standard on Board Design talks about parts weighing 5 gm or more per lead shall be supported. And goes into detail that you can find there. I image much of the requirement for staking has to do with: * Weight of the component * Servi

minimal distance between THT solder padsfor selective soldering

Electronics Forum | Wed Apr 18 15:10:10 EDT 2018 | charliedci

If someone can find a RoHS specific standard I would be interested. IPC-2221 nor 2222 separate leaded from lead free (that I could see). Charlie

Via spacing

Electronics Forum | Thu Dec 05 08:32:56 EST 2019 | scotceltic

Thank you for the quick response. Can you tell me the exact verbage from IPC 2221B regarding via to via spacing ? I have Revision A and couldn't find anything that refers to this ? Thanks again for your help

0402 opposing track balance

Electronics Forum | Fri Aug 08 12:52:57 EDT 2003 | davef

So, if you give your customers design guidelines and one their products causes a cataclysmic explosion, resulting in the deaths and disfigurement of many handicaped third-world children, could a lawyer consider you responsible? Spec Fir Tree General