Electronics Forum | Thu Mar 17 09:56:34 EST 2005 | jmedernach
Tx, Your spec limit is the point at which you expect to see a failure. In other words, what is the probability that you'll see a short when you have .008" of solder paste? What is the probability that you'll see an open if you have .004" of solder
Electronics Forum | Tue Mar 22 17:08:01 EST 2005 | finepitch
We might need to open up the term "mass production" here, but I will give it a try anyway. I've seen semiconductor packaging companies in the far east where they pick up balls with a vacuum head, consisting of holes matching the pattern of the BGA p
Electronics Forum | Tue May 31 16:21:25 EDT 2005 | fastek
Panasonic and Fuji made their reputations in this business with their chipshooters. These are bullet proof machines that will perform admirably in the field for decades hence their reputation cannot be argued. However...what they are building today a
Electronics Forum | Fri Jun 03 16:52:48 EDT 2005 | davef
Your customer is being smart. When we look at the evaluation that some component suppliers do in assessing the potential of the pure tin solderability protection they've chosen to produce tin whiskers, we just shake our heads. Essentally they say,
Electronics Forum | Thu Jun 09 13:16:44 EDT 2005 | stepheniii
Do you have any parts dedicated on the machine? 100n 0603 or 0805 is probably used on almost everything you build. So why take it off and put it on the machine several times a day. Even if you dedicate only 20 parts to never come off the machine, tha
Electronics Forum | Fri Jun 10 13:36:10 EDT 2005 | ratsalad
James, It's good that you have internal part numbers. Some CMs use customer part numbers which makes dedicated setups much more difficult. Your materials group can tell you the quantities of part numbers they buy, and that can tell you which parts
Electronics Forum | Tue Jun 21 19:25:10 EDT 2005 | darby
This is basically the reply that I had from Heller ovens regading this - "The recommended air flow is at the back of the machine near the vent. From the book I copied from you it should be 500 CFM. If you do not achieve this figure, it not a great
Electronics Forum | Fri Jul 08 16:35:04 EDT 2005 | Jason Fullerton
"Whether or not you need a toe fillet depends on your application. We have high reliability products where we can't use a QFN over a certain size, regardless of toe fillet. We have other applications where we meet the thermal cycle requirements for a
Electronics Forum | Thu Jul 21 03:54:39 EDT 2005 | Rob
Never thought I'd hear myself say this (& I will punish myself later). Whatever you do, don't buy an AP25, CP4 or IP2 for starting out in low volume. 1) You will need a LOT of space 2) You will need a very good constant air supply else the AP25 wil
Electronics Forum | Tue Jul 19 12:12:02 EDT 2005 | chunks
I have a QFP 160 used on 9 different products that had high fall out for "Insufficient Solder". Basically, a leg or two would pop free when inspected occasionally. This same part is used on different size products, located at different area of each
