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Re: BGA PAd Soldermask

Electronics Forum | Wed Feb 16 21:51:29 EST 2000 | Dave F

Kurt: Lots of choices, not many of them good, yano. 1 So LPI has taken over the market pretty nearly 100%, but it won't "tent" reliably, because it is not very viscous when applied and drops into the hole. So then, tenting/plugging with LPI is bad

Re: BGA PAd Soldermask

Electronics Forum | Wed Feb 16 21:51:29 EST 2000 | Dave F

Kurt: Lots of choices, not many of them good, yano. 1 So LPI has taken over the market pretty nearly 100%, but it won't "tent" reliably, because it is not very viscous when applied and drops into the hole. So then, tenting/plugging with LPI is bad

Re: Altera PQFP240 Solderability

Electronics Forum | Thu Apr 16 13:50:49 EDT 1998 | Lou

| We are having some difficulty soldering a 240 pin Altera device. We use Alpha WS-609, a very generic profile for that solder paste, and a 6 mil stencil with laser cut apertures (1:1 ratio). This is a 20 mil pitch device (aperture size is 10 mils X

Re: Altera PQFP240 Solderability

Electronics Forum | Thu Apr 16 13:47:36 EDT 1998 | Lou

| We are having some difficulty soldering a 240 pin Altera device. We use Alpha WS-609, a very generic profile for that solder paste, and a 6 mil stencil with laser cut apertures (1:1 ratio). This is a 20 mil pitch device (aperture size is 10 mils X

Re: Tin-Lead thickness on PWB's/Let's Hear More

Electronics Forum | Thu May 28 07:25:58 EDT 1998 | Earl Moon

| Hey yooze guys! | Enough of the jokes between you and Earl (GRIN), let's get back to the topic...well, okay... you can tell a few more...(but good ones, 'kay?) | Anyhoo...I'm not sure if ya'll are on the IPC Technet list or not, I've not seen any p

Re: Tin-Lead thickness on PWB's/Let's Hear More

Electronics Forum | Thu May 28 05:43:33 EDT 1998 | Earl Moon

| Hey yooze guys! | Enough of the jokes between you and Earl (GRIN), let's get back to the topic...well, okay... you can tell a few more...(but good ones, 'kay?) | Anyhoo...I'm not sure if ya'll are on the IPC Technet list or not, I've not seen any p

Fiducial replacements?

Electronics Forum | Fri Nov 30 18:22:40 EST 2007 | mika

Hi Paul M, There are no silly questions but silly answers.. and here is maybe a few if I understand you correctly: If you consider place anything less than a 1.27mm (50mil) pitch component down or a chip less than a 1210, hey it maybe don't even work

SIR starting point...?

Electronics Forum | Mon Oct 21 22:15:36 EDT 2002 | davef

First, SIR data is heavily dependant on the test pattern selected. Be very careful when comparing the results of resistance readings taken from different geometric patterns. Second, if yer talkin': * Bare boards, yupper. * Finished assemblies impor

Re: Green coating and through-hole plating

Electronics Forum | Fri Aug 14 07:27:42 EDT 1998 | Earl Moon

| | Hi, can you please tell me how to make green coating and through-hole plating of PCB? Thanks! | | Xingsheng | Xingsheng: Welcome. | Bible on PCB fabrication: Printed Circuits Handbook, Clyde Coombs, McGraw-Hill | Web resources: http://www.pw

Re: Green coating and through-hole plating

Electronics Forum | Fri Aug 14 08:59:51 EDT 1998 | Dave F

| | | Hi, can you please tell me how to make green coating and through-hole plating of PCB? Thanks! | | | Xingsheng | | Xingsheng: Welcome. | | Bible on PCB fabrication: Printed Circuits Handbook, Clyde Coombs, McGraw-Hill | | Web resources: htt


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