Electronics Forum | Fri Mar 03 10:07:15 EST 2000 | Wolfgang Busko
Hi Jacqueline, - what a name in this technical world - I just tried the calculator and for example choose the CQFP and then selected other and an input mask appeared where you have to fill in the required data from the components datasheet. I have to
Electronics Forum | Wed Mar 08 10:52:27 EST 2000 | Wolfgang Busko
Hi Jacqueline, for the "manufacturing allowance" IPC says FAB.TOL. is the board manufacturing tolerance and PLACE ACRCY is the pick and place accuracy. For 0,8 mm pitch they give for both values 0,1 mm. Solder joint design goal data comes from empir
Electronics Forum | Fri Mar 03 10:07:15 EST 2000 | Wolfgang Busko
Hi Jacqueline, - what a name in this technical world - I just tried the calculator and for example choose the CQFP and then selected other and an input mask appeared where you have to fill in the required data from the components datasheet. I have to
Electronics Forum | Wed Mar 08 10:52:27 EST 2000 | Wolfgang Busko
Hi Jacqueline, for the "manufacturing allowance" IPC says FAB.TOL. is the board manufacturing tolerance and PLACE ACRCY is the pick and place accuracy. For 0,8 mm pitch they give for both values 0,1 mm. Solder joint design goal data comes from empir
Electronics Forum | Mon Jun 25 20:37:14 EDT 2001 | davef
You are 100% correctamundo that the pad on PCB should be the same as the pad on the BGA interposer, but let�s not expend that thinking to the aperture of your solder paste stencil, right away. Generally, paste on large pitch BGA is often 1:1, but as
Electronics Forum | Fri Sep 16 08:05:15 EDT 2011 | jax
Some people believe that increasing the outer dimension will aid in centering the device during reflow...
Electronics Forum | Fri Sep 16 14:51:06 EDT 2011 | isd_jwendell
I recently did a layout for a Freescale accelerometer and the mfg recommended pad layout did something similar. They where very specific in the pad layout dimensions. They stated the reason was "With the correct footprint, the packages will self-alig
Electronics Forum | Thu Sep 15 21:53:38 EDT 2011 | davef
Excellent drawing Darby. You haven't lost your touch. Spirograph jeez Do you and that beautiful woman still get good parking at Watto's? http://www.sydneypubguide.net/pubs/Watsons_Bay_Hotel_(Doyles).aspx
Electronics Forum | Fri Sep 16 23:38:47 EDT 2011 | nikyta
Some italians believes it... http://www.seritronics.it/download_italiano/seritronics%20_convegno%20saldatura2.pdf
Electronics Forum | Mon Sep 19 09:31:04 EDT 2011 | jax
No white Papers... although you might want to look at Renesas Semiconductor. They have a nifty little formula that seems to not take enough variables into consideration.
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