Electronics Forum | Sun May 10 06:40:28 EDT 1998 | PhingMae
Hello. 1 Could anyone tell me the range of temperature to solder MI components? The process eng is using 400~500 degrees Celcius!! For standard 0805/0603 chips & TH components & also to touch up on ICs. What is the consequence?
Electronics Forum | Mon Mar 18 11:04:39 EST 2002 | slthomas
At a previous employer we used a pneumatic dental type drill with nice results. The 1/4" hose is much more flexible than a flex drive cable, there's no motor module on the work surface, and the foot pedal for the air a little more elegant than two-h
Electronics Forum | Fri Jan 10 14:11:27 EST 2003 | genny
It's always safer to use a higher voltage cap than a lower voltage cap. It isn't a fuse... There is only one case where we dropped the voltage on a cap. We were using a tantalum cap that was rated to 16V, but had been built in the standard packagi
Electronics Forum | Tue Jul 22 09:05:14 EDT 2003 | davef
Any-Layer Interstitial [Inner] Via Hole (ALIVH). In printed circuit board fabrication, a registered mark of Matsushita Electric for a filled microvia structure in all layers for applications requiring small-size, lightweight build-up PWB to achieve
Electronics Forum | Tue Nov 25 16:26:43 EST 2003 | tdurston
We are trying to establish requirements and process controls for completed, cleaned SMT assemblies. We have problems with our high impedance circuits (100 meg ohms) being affected by residue. Some boards require additional cleaning cycles to remove
Electronics Forum | Thu Mar 10 15:10:07 EST 2005 | bandjwet
In reviewing the myriad of BGA reliability tech papers there seems to be little commonality in the type of test protocols. There are tests that are industry specific, device vendor specific and customer specific. What guidance in terms of minimum me
Electronics Forum | Fri Mar 30 06:58:24 EDT 2007 | ck_the_flip
Alot of QM's and QE's are typically failed Engineers who lack common sense. They don't understand that measuring in DPMO's (versus DPU's) "normalizes" your data for Printed Circuit Board Assemblies (PCBA's) so that if you have 10 defects on a PCBA t
Electronics Forum | Mon Apr 23 15:28:48 EDT 2007 | ev
To date we are a small niche CM doing prototype and small runs. Any testing we do now is purely functional tests on the pcb ass'ys. In some cases the hardware and software is supplied by the customer, in most cases it's one or the other. We want to e
Electronics Forum | Mon Apr 30 22:41:29 EDT 2007 | davef
Cross: IPC nor anyone else calls out recommended pressures for washers used to clean circuit boards. IPC and the other standards setting folk are in the business of defining the expected results or outputs of processes or acceptance criterion. They
Electronics Forum | Mon Jul 16 12:03:42 EDT 2007 | davef
We're aware of no industy acceptance standard for max moisture content of a board. For more on moisture levels, get a copy of: "Removing Moisture from Electronic Components and Assemblies", CS Leech, Jr, Circuits Assembly, May 1994. The article disc
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