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| 00:29.58 | davidc__ | re: the BGA discussion above |
| 00:30.14 | davidc__ | I've done 0.65mm BGAs with a hot air tool + solder paste |
| 00:30.18 | davidc__ | with a 100% success rate so far |
| 00:30.29 | davidc__ | and hand placement |
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| 00:41.50 | SpeedEvil | with a stencil? |
| 01:14.45 | davidc__ | SpeedEvil: yeah; just a mylar stencil |
| 01:15.17 | davidc__ | SpeedEvil: the trick I found was to use kapton tape to create a bounding box around the pads; so you can feel when its aligned |
| 01:15.47 | SpeedEvil | you mean so it's just touching the balls? |
| 01:16.00 | davidc__ | around the outside; yes |
| 01:16.10 | SpeedEvil | Interesting. |
| 01:16.25 | davidc__ | I plan to write up my method one of these days - I haven't found any references to anyone else doing it that way |
| 01:16.50 | davidc__ | SpeedEvil: it was especially needed in my case because of the tight spacing; precise alignment required; and low profile and large overhang of the IC I was using |
| 01:16.55 | davidc__ | which made checking the alignment impossible |
| 01:17.00 | SpeedEvil | Interesting. |
| 01:17.13 | SpeedEvil | I've pondered doing a little oard witha couple of BGAs. |
| 01:18.06 | SpeedEvil | mylar stencil to make solder pads, then tape so you can align well, then heat? |
| 01:18.52 | davidc__ | SpeedEvil: I put the kapton down first |
| 01:19.08 | davidc__ | SpeedEvil: since I didn't want to get solder paste or flux underneath the kapton |
| 01:19.21 | davidc__ | the mylar stencil seemed to conform well enough to produce good pads |
| 01:19.33 | davidc__ | [though my stencil had slightly undersized openings, so I didn't get as much paste as I wanted] |
| 01:21.00 | davidc__ | SpeedEvil: some pix: http://www.dropbox.com/gallery/4076823/1/bga_article?h=b58f0e#/ |
| 01:21.57 | SpeedEvil | Did you pull the stencil, or does it stay? |
| 01:22.22 | davidc__ | SpeedEvil: I removed the stencil before hot air; if thats what you mean |
| 01:22.37 | SpeedEvil | yeah |
| 01:22.50 | SpeedEvil | Looks good. |
| 01:24.06 | davidc__ | apologies for the massive pixelation / blurring, but its a customer design |
| 01:24.15 | davidc__ | well, design for a customer |
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| 14:32.15 | chouimat | morning |
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