Electronics Forum | Wed Dec 15 05:15:46 EST 1999 | Marlies Hanf
Hi. Can someone explain to me what coplanarity is? There are a few rather irritating and contradictory definitions of that term. When leads are coplanar - what are they then? Are they parallel to each other or not? Thanks, Marlies
Electronics Forum | Thu Dec 16 06:59:12 EST 1999 | Calvin Wong
Coplanarity also takes into consideration which is your reference plane. In the case of connectors, you can consider coplanarity between the highest and the lowest lead. Also, you can consider all the connector leads with reference to the connector
Electronics Forum | Wed Dec 15 07:03:09 EST 1999 | Chris May
Marlies, The IPC definition, which I think we can trust, says that Coplanarity is defined as lying or acting in the same plane. In other words Coplanarity means no bent legs, pins. Regards, Chris.
Electronics Forum | Thu Feb 20 11:57:48 EST 2003 | mdm4ua
I placed a micro bga using flux paste and ran it through my oven and it came out as if someone had pushed down on one side. I can find no reason for this, has anyone ever seen this and how did you fix it?
Electronics Forum | Wed Jan 03 12:33:37 EST 2001 | Terry Burnette
John, There is one process issue that occurs with the larger BGA packages which have coplanarity near the high end of the .2mm spec.. The defect is commonly referred to as "ball in cup" and "head in pillow". It is an open solder connection whereby th
Electronics Forum | Tue Aug 26 21:20:58 EDT 2003 | iman
You may check with the TDS of respective "active parts" IC manufacturers for their recommended no. of thermal cycles permissible in the reflow process. Last I checked 3 cycles for our RF-apps IC was still allowed. For 48pin-QFPs this can be allowed
Electronics Forum | Wed Mar 10 08:19:01 EST 2010 | aajmera
We have these standard pitch QFPs, for which we found some coplanarity error issues. The issues surfaced during BLT. We do not have any instrument to measure the coplanarity error before the component is loaded on the placement machines. Is there any
Electronics Forum | Mon Apr 09 11:39:32 EDT 2018 | emeto
The easiest way to do without special tools is to use level. Check machine co-planarity on the conveyor rails in both directions(you can do that with rails down or rails up or both). Then check co-planarity on the stencil. If the level shows the sam
Electronics Forum | Wed Apr 23 21:04:57 EDT 2003 | BOB
Now I urgently need the standard of IPC-2252 Design guideline for RF/Microwave PCBs, Who can help me? By the way,who can recommend some DFM experts on RF PCB design?look forward to your responding.thank you!
Electronics Forum | Mon Feb 25 17:07:15 EST 2002 | peterson
We are using a Panasonic MPAV2 to place some QFP's. Can someone please help me with a problem we are having with coplanarity! The machine is "dropping" parts due to coplanarity issues. What settings should we be looking at in order to eliminate the
