Electronics Forum: smt and hmp and solder and paste and reflow and profile (Page 1 of 6)

Intermetallics and reflow profile

Electronics Forum | Tue May 02 15:29:14 EDT 2000 | M. F. Roe

I am looking for public papers or articles on intermetallic formation as a function of reflow profile. Most solder paste vendors specify peak temperature and time above liquidus, but I am particularly interested in what happens to intermetallic grow

Re: Intermetallics and reflow profile

Electronics Forum | Wed May 03 20:24:22 EDT 2000 | Dave F

MF: I know of nothing that addresses your question directly. Let me suggest: * Technical types at your solder supplier should be able to help. * "Effect Of Intermetallic Compounds On The Thermal Fatigue Of Surface Mount Solder Joints" PL Tu, et a

SOT23s and paste + glue

Electronics Forum | Wed Dec 24 20:29:45 EST 2008 | xianhua_tang

Oh,I consider the process is wrong,it is stencil print paste-mount-reflow -apply glue-reflow,then wave solder. it must pass twice reflow,also the first reflow profile is different and the second .

SOT23s and paste + glue

Electronics Forum | Mon Dec 22 11:09:21 EST 2008 | mfcat

We changed paste manufacturers rather recently and are now seeing SOT23s falling off after wave solder. These parts have a dual process... we stencil print paste, apply glue, populate then reflow. Only SOT23s fall off, chips are fine. We do not be

Re: Bottom side smt and thru hole

Electronics Forum | Wed May 27 14:35:52 EDT 1998 | Justin Medernach

| | R&D is currently designing a board with smt components on both sides of the board. They are adding a 16 pin IC Gull wing. on the bottom side of the board. I have asked for only caps and resistors to be placed on the bottom side. Is there a recomm

01005 components and reflow profiles

Electronics Forum | Mon Apr 09 19:50:33 EDT 2012 | action_101

Hello, We're building some boards with 01005's and the only issue we are running into is the solder is not reflowing. It's the damnest thing, we are having no issues with the printing process or placing the components, the two areas we thought we wo

01005 components and reflow profiles

Electronics Forum | Tue Apr 10 04:16:20 EDT 2012 | grahamcooper22

you are seeing a typical issue that is caused when such small volumes of paste are printed....there are several reasons for it..the tiny amount of flux in the small deposit becomes exhausted much quicker then it does in a larger deposit ( the flux ma

Re: Bottom side smt and thru hole

Electronics Forum | Wed May 27 13:42:08 EDT 1998 | Chrys

| R&D is currently designing a board with smt components on both sides of the board. They are adding a 16 pin IC Gull wing. on the bottom side of the board. I have asked for only caps and resistors to be placed on the bottom side. Is there a recommen

Time and temp in lead and lead-free reflow

Electronics Forum | Mon Jul 28 11:31:42 EDT 2008 | blnorman

Ideal situation is get a technical rep from the solder paste supplier. They know their paste better, and should be able to work out a profile based on their paste and your oven. Again, a technical rep, not the sales guy.

Time and temp in lead and lead-free reflow

Electronics Forum | Fri Aug 01 21:10:35 EDT 2008 | leo_dektec

You can keep only the 5th zone as the reflow zone. And lower the first two zones to keep a good ramping rate. Meanwhile,please note the ting temperature in software or control panel is not the exact temperature in your PCB, you'd better get a KIC or

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