Electronics Forum | Thu Mar 02 15:12:50 EST 2000 | Robert Hartmann
To restate my question of earlier, if I have a .020" sphere before reflow, and my pad opening in the dielectric is .017", is there a rule of thumb to calculate the height of the sphere after reflow? We are using 62Sn/36Pb/2Ag spheres. This should h
Electronics Forum | Thu Mar 02 14:33:26 EST 2000 | Doug Philbrick
I have a customer wanting to hide the identity of a particular component on a PCB assembly. The product cannot be potted and since the PCB is the product he doesn't want to pour over that one chip for aesthetics reasons. Any ideas on ways to permanen
Electronics Forum | Fri Mar 03 14:01:49 EST 2000 | dean
This technique is commonly known as "black boxing". The majority of IC's are marked with ink. Simply use a tiny piece of sandpaper to "scratch the surface" and render the device blank. This will work with Laser marked parts as well. If your volum
Electronics Forum | Thu Mar 02 09:13:07 EST 2000 | jacqueline Coia
Could anyone please tell me if there is a quick simple formula for working out the ideal SMD footprint for a 52 pin QFP using the dimensions specified on the manunfacturers component drawing. I know of the IPC 'SMD land patterns' standard, which I e
Electronics Forum | Thu Mar 02 11:57:25 EST 2000 | Wolfgang Busko
Did you try the online-calculator at the IPC-page. If you have the datasheet it should be no problem. For wave soldering I can�t tell if it�s suitable for that particular part, but you should add extra pads at the end of each column to solderbridging
Electronics Forum | Fri Mar 03 06:41:09 EST 2000 | jacqueline coia
I have tried the IPC calculator and they do not have this type of component registered. When trying to select 'other' on menu, no connection can be made. The polarity if the QFP has not been decided yet (pre-PCB design) the pitch size of the componen
Electronics Forum | Fri Mar 03 10:12:41 EST 2000 | Dave F
Jack: "Calculator/Other" works for me. But you know what, I'll bet they block Scotts from using it, because they're reputed to be too cheap to buy the standard. ;-) (Your component is in the standard. ;-)) If you can't get the supplier to help and
Electronics Forum | Wed Mar 08 09:54:11 EST 2000 | Jacqueline Coia
Finally got using the calculator guys, (used another server connection). Not sure about the data that is entered for 'solder joint analysis', any helpful hints? To touch on the subject of Scots people being 'cheap', I cant understand these rumours, w
Electronics Forum | Thu Mar 02 04:23:49 EST 2000 | Alan
Hi, I'm trying to put together a directory of component manufacturers that offer a lead free alternative for their devices. If anyone knows of manufacturers that are producing these devices then it would be greatly appreciated if you could pass the
Electronics Forum | Wed Mar 01 13:06:36 EST 2000 | Graham Naisbitt
$100K for a full in-line. We can do conventional spray at 30 to 50% less but you must mask components you don't want to coat. If they are on 1 end only of the board, then dip coat which is the least expensive option starting at around $12K for up to
