Electronics Forum | Wed Nov 13 02:28:27 EST 2019 | trino
Hello, I am a Japanese engineer. I am sorry for my unskillful English. Have you ever encountered cracks in chip resistors or IC components due to board mechanical stress? Especially, I'm looking for a case in the PCBs Depaneling process(pizza cutte
Electronics Forum | Mon Jul 18 13:34:31 EDT 2005 | jzaccari
Francisco, You need to be concerned about "lead-free" BGAs. The SAC balls will not reflow at at standard tin-lead process temps. I have seen many examples where this has been a very big problem. In once case the BGAs just poped-off when the board was
Electronics Forum | Sat Jul 19 12:07:46 EDT 2008 | operator
I have alot of experience creating assembly drawings for SMT and THT products. However, we are now doing very large ,complicated box builds that have many terminal blocks, point to point and cable harnesses. It is my job to create these assembly doc
Electronics Forum | Wed Dec 01 10:14:41 EST 1999 | Wolfgang Busko
Hi Steve, the "framepiece" I mentioned may be misunderstanding but sometimes I don�t know the common english expression. What I meant is if the PCBs do not come in panels (now you mentioned 3-up panel)the PCB supplier could add additional material to
Electronics Forum | Mon Mar 22 05:39:36 EST 1999 | Bob Willis
Has any one seen failures of chip resistors after 1-2 years where the junction between the silver termination and the restive element on the top of the ceramic has corroded through. This results in a high resistance failure after this period of time.
Electronics Forum | Thu Feb 03 22:02:11 EST 2022 | stephendo
Another long shot. Are there any irregularities in the shape of the body or leads of the parts that are skewed? Any flash from the molding process for example? Almost all SOT-23s that I have seen are basically perfect but I seem to remember seeing so
Electronics Forum | Thu Jun 16 17:02:40 EDT 2011 | boardhouse
The finish looks like Immersion Tin or Silver. if its lead free Hot air - could be issue of to high of a Tin Content. find out what brand of Hasl they are using. SL100 Example. Is this tarnished look only being seen after assembly or have you seen
Electronics Forum | Thu Oct 27 13:42:12 EDT 2011 | sjs2303
I know what you mean but have never found a tool that would do this sufficiently. For higher value parts you should keep them in a bag for the next time you run a job that uses that part and hand fit them. The nature of the feeders means that you w
Electronics Forum | Mon Jun 18 11:23:44 EDT 2001 | Gil Zweig
BGA defects observed with x-ray inspection fall into catagories. One catagory is the obvious defects; i.e. soledr bridges, missing balls, excessive solder voids. The second catagory is the more subtle "potential" defect. This is where variations in
Electronics Forum | Thu Mar 18 16:39:14 EST 2004 | Jed Johnson
A few good points have been made here: The profile could be ramping too fast. The profile could be gettting too hot. The profile may need to have more "soak" time before reflow to allow the board temperatue to equalize and the board to "relax" and st
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