Electronics Forum | Fri Nov 16 10:53:30 EST 2001 | Carol Stirling
Hello Everyone, Our board supplier changed our board surface finish on a prototype to flat solderable tin (FST) because of the PWB thickness (.125"). The pads seem to be contaminated, particularly on second side pass through reflow. The solder appea
Electronics Forum | Mon May 13 08:00:18 EDT 2002 | Yannick
Hi, Did someone ever heard about Entek? Last week I was speaking to a board manufacturer and he suggest me this coating. You can have information on http://www.enthone.com. It's suppose to be just like a plating that he put on the pad, so you ha
Electronics Forum | Tue May 28 16:19:52 EDT 2002 | zanolli
Hello Floyd, Yes, special tooling is required. The tooling usually consists of a press, push-in tooling and support plate tooling. The presses can range from relatively simple arbor type presses to automated hydraulic presses with sophisticated con
Electronics Forum | Thu Jun 27 17:24:17 EDT 2002 | Daan Terstegge
Never did a DOE on that, but I think it would be quite difficult to warp a board inside the oven if it was flat when it entered the machine. If there's no center-board support then it's another story, then the board will bend due to it's own weight.
Electronics Forum | Tue Mar 09 22:20:16 EST 2004 | Ken
Is this a PBGA? If yes. run a flat steel rule or edge across the top of the PBGA. Is it flat or cupped? Is this a TBGA (super bga). I have seen issues with a suppliers heat spreader design that actually will deflect the corners down and raise the
Electronics Forum | Wed May 26 05:05:04 EDT 2004 | curious
hi, we have a batch-rework for a axial 2-lead LED component. we are thinking of bending both ends of the axial-leads into a L-shape at 90degree angle, and solder the flat-end of the L-shape flatly to the PCB's SMT pad. hope the experienced guys/exp
Electronics Forum | Mon Jun 28 10:17:44 EDT 2004 | davef
People like flat surfaces for placing and reflowing certain components, like fine pitch devices. Some board suppliers can supply HASL that is flat and well controlled from an amount of material stand-point. Unlike OSP, HASL has a wonderful shelf-li
Electronics Forum | Fri Apr 01 04:51:53 EST 2005 | dougs
I think what Russ is getting at is that the granite table is used for it's flat surface to aid in measurement, the flat surface helps to measure heights very accuratly. If you add another surface on top of that then you lose what the granite surface
Electronics Forum | Wed Aug 10 11:57:16 EDT 2005 | pr
Is the peelable mask (put on by the boardhouse) flat on the surface of the pcb? If so can you tell me the material name, so maybe I can find a picture? We have to print adhesive on the board, so the mask has to be flat. That is why Kapton from the b
Electronics Forum | Thu Aug 25 11:15:16 EDT 2005 | dougs
do you mean the board support pins? generally anytime i've set these up i've just set the height as i've went, i put the pin under the board, with the board clamped, and move it up until it touches the board and set it there. you just need to make
