Electronics Forum | Thu Feb 24 16:14:46 EST 2005 | davef
Rob: Why aren't the board houses over there going to lead-free HASL [not that HASL is the most wonderful thing on the planet]? What's the price delta on an unit basis for a x-HASL, now imm Ag board? Anyhow back to the point, so, you're proposing t
Electronics Forum | Mon Mar 21 04:35:13 EST 2005 | Base
Just thinking out-of-the-box literally: If you can not get a second hard-disk into the machine, why not take the hard-disk out of the machine and attach it to a PC. Once it has been connected as an auxilliary hard-disk to a PC it is very easy to make
Electronics Forum | Wed Mar 30 19:54:36 EST 2005 | mattkehoe
We've already done it for a customer. We used 63/37 ssd's on the top side where the are a few caps and one 256 pin QFP, coated with adhesive flux to hold the component, and lead free un flattened ssd's on the bottom to be attached to the other boar
Electronics Forum | Wed Apr 06 11:58:02 EDT 2005 | patrickbruneel
Hi SMT Engr With a double-header connector do you mean Double Level Right Angled Header Connector. If so there is a big difference in heat sinking capacity between the two rows, as where the pins of the top connector absorbes twice as much heat as t
Electronics Forum | Fri Jun 10 12:11:49 EDT 2005 | chunks
QS and ISO can really play a part here. If so, the best way I found was to run parallel T-couple ports to the thermocouples of the oven. Now you can run a board and gather all your thermal information and set your temps. Now use parallel ports to
Electronics Forum | Tue Jun 07 21:50:46 EDT 2005 | davef
Most component fabricators don't properly understand the impact of soldering with pure tin solderability protection on components. Here's one that does: "The Effects of Board Attachment Processing on Sn Whisker Formation on Electroplated Matte-Sn on
Electronics Forum | Fri Nov 25 09:31:56 EST 2005 | davef
pyramus, First, search the fine SMTnet Archives for previous discussions on BGA shorts. Second, we're still not clear on the issue. * Is the problem with a BGA? If so, please describe the BGA, including any heat spreader * Is the problem with a uB
Electronics Forum | Wed Feb 15 09:00:46 EST 2006 | GS
if you look at the J-STD-033B, you will see that such a large PQFP could stay even longer the 24h at 125�C even if internally is already totally dry. It could be, the balls can get oxided and also IMC (Inter metallic compounds) could grow avery littl
Electronics Forum | Wed Feb 15 16:10:13 EST 2006 | slthomas
My understanding is that you get a reading that's the average of all of the jumped points if you jump tc wires with conductive tape. If you're doing multiple parts on a board with varying masses and don't control the attachment method (i.e., how mu
Electronics Forum | Thu Mar 16 12:22:21 EST 2006 | stepheniii
Larry, I have said this on the forum > before. > > THE ONLY WAY TO KNOW IF OVEN HEATER > SET POINTS ARE CORRECT IS TO ATTACH THERMO > COUPLES TO YOUR PC BOARDS AND RUN A THERMAL > PROFILE WITH A DATA-LOGGING DEVICE! > > Anything > other than t
