Electronics Forum | Tue Apr 13 08:21:05 EDT 2010 | esca
Hi manchella, After ATC test, two different failure modes can be present: solder FATIGUE (into bulk) or BRITTLE INTERMETALLIC fracture. So, first you have to verify this. Moreover, which brand of SMT paste have you used ? The crack into solder joint
Electronics Forum | Fri Jul 04 21:09:04 EDT 2003 | ramanandkini
I have a CEM-1 PCB board with 35 microns copper. This is PCB is finished with SMOBC+HALS. We do solder SMT LEDs, but till date we do not have problems that you have listed. The LEDs are good & bright. It even passed high & low temp cycle tests (-40 t
Electronics Forum | Tue Jun 16 09:15:56 EDT 1998 | Justin Medernach
| We are very concerned about microcracking in SMT P&P process. I want to know something about: | What is microcracking? | When did it occur? What are the causes? | How can avuid this phenomena? Toni, Micro cracks can be caused by a ton of conditions
Electronics Forum | Thu Jun 25 09:37:48 EDT 1998 | Russ Miculich
The real causes of microcracking are not normally due to pick and place - particularly if you are using a piece of equipment with vacuum pick up and release. The real cause of microcracking is due to thermal stresses on the die and the choice of the
Electronics Forum | Wed May 09 17:49:16 EDT 2012 | dyoungquist
We run a Mydata high mix, low volume line. You can handle strips with either the Agilis feeders (losing the first 5-10 parts) or by placing the strip on the Y or tray wagons. For cheap parts like resistors, capacitors, some diodes and small ICs, ou
Electronics Forum | Tue May 26 17:29:42 EDT 1998 | Earl Moon
| I know, I've read the "been there done that" stories about this subject, but I still profess ignorance on some aspects. | We are using NPO type dialectric caps in potted high voltage assemblies and continue to experience catastrophic vailures. U
Electronics Forum | Thu Jul 08 15:38:27 EDT 1999 | Earl Moon
| Thank you all for your replies. Thanks to your replies and backup from the IPC-SM-782A (section 3.6.3.2) and James Blankenhorn's "SMT Design Rules & Standards," the designer has agreed to provide adequate clearance between the via and the pad. |
Electronics Forum | Tue Mar 08 11:50:55 EST 2011 | pgoodyear
As a technician that does frequent board level repair / rework some issues have come to mind. I have been an electronics technician for almost 50 years. In that time I have seen the evolution of electronics from point to point wiring using vacuum
Electronics Forum | Wed May 07 01:40:41 EDT 2008 | andrzej
What techniques do you use practically to reduce rearmament time of SMT line in high mix production ? There was such post on forum about it but I would like to gather all techniques in one post so everyone can add some ideas which are already applie
Electronics Forum | Sat Jun 30 06:02:46 EDT 2018 | ali_jayyad
Hi, I was wondering what is the difference between MP and NO at the end SMT part number. I tried to look into it but could not find anything promising. e.g I have a resistors with part numbers 0603-NO and 0603-MP and 0603-RES. What could be the diffe
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