Electronics Forum | Wed Apr 26 08:13:47 EDT 2017 | spoiltforchoice
MSL 1 is unlimited factory floor time before reflow. I have spools that are 10+ years old and haven't encountered any issues using those parts. It goes without saying those parts are not exactly used in volume so its not a massive sample but that is
Electronics Forum | Wed May 03 02:23:11 EDT 2017 | Rob
Many years ago (20+) we did this by preassembling the 2 parts into a mini leadframe with high temp solder paste, which was a pain but then they could be dropped in trays, surface mounted and hit the line clean. I'm guessing you have a low value cap
Electronics Forum | Mon Jun 05 10:42:28 EDT 2017 | philc
I guess it all depends on volume. If you are talking thousands of PCB's, then automation is best, if possible. Otherwise, hand-soldering them post-production is the obvious solution. How about bill-boarding them? That way, they would fit on the land
Electronics Forum | Mon Jun 05 12:30:24 EDT 2017 | deanm
Mike, The dispensable solder paste is ordered separately from the printed paste because it has a higher flux content. I would not feel comfortable mixing liquid flux into the printable paste. Ask your paste vendor if they have a dispensable version.
Electronics Forum | Mon Jun 05 14:37:55 EDT 2017 | stevezeva
At a past employer we stacked caps and resistors quite regularly. As some have suggested a dispensable paste was used and dispensed by hand and then the stack was placed. At first it was placed by hand, but then we were able to program our Mydata to
Electronics Forum | Thu Jul 20 23:41:55 EDT 2017 | heros_electronics
Below is an email that I copy and pasted from my customer's engineer about his concerns with the issue of the chips not reflowing (which is why I was asking about X-ray the chips to make sure they reflowed): Can you let me know your thoughts on his
Electronics Forum | Thu Aug 10 07:29:43 EDT 2017 | stivais
How do you evaluate the soldering quality for those QFNs? X-Ray or AOI? For some QFNs (and other bottom termination components) it's not supposed to have solder fillets on toes. It's also noted in IPC-A-610 (Rev.F 8.3.13). Take a look at your QFN ch
Electronics Forum | Fri Sep 15 09:08:01 EDT 2017 | rvines1
It gets tricky when resistors that your customer specified are no longer marked, but they think that unmarked resistors are a defect, and the manufacturer hasn't updated their data sheet to show the parts as unmarked, so you don't have anything to sh
Electronics Forum | Sat Oct 28 08:51:20 EDT 2017 | rvines1
The manufacturer I was having issues with was Panasonic. The parts we use were unmarked, but their catalog pages didn't make any mention of marking and included photos of marked parts. After 6 months of making various unsuccessful contacts with Pan
Electronics Forum | Tue Mar 13 20:47:39 EDT 2018 | davef
I think of palladium coated copper with gold flash (CuPdAu) as bond wire used in chip attach. Look here: https://www.heraeus.com/media/media/het/doc_het/products_and_solutions_het_documents/bonding_wires_documents/fact_sheets/Factsheet_PdFlash.pdf
