Electronics > Projects, Designs, and Technical Stuff
SMD at home
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tggzzz:

--- Quote from: mayor on April 15, 2019, 03:35:33 pm ---OK, so it's not just me :-)

I have an IR toaster oven, but never finished a reflow controller project. For home stuff, do any of you eyeball it ? I could stick a thermocouple in there and be the controller!

--- End quote ---

Saucepan with a glass lid on the gas hob. 5mm of sand in saucepan to spread the heat. Non-contact thermometer is optional.
Psi:

--- Quote from: Kjelt on April 16, 2019, 07:13:14 am ---
--- Quote from: pix3l on April 16, 2019, 06:34:26 am ---You could also try using a thinner stainless stencil in order to get less solder paste on the pads. For example PCBWay has four different thicknesses (0.1 , 0.12 , 0.15 and 0.2 mm).

--- End quote ---
The possible problem with that choice is that you can get too little paste on the normal component pads.
So in order to facilitate the few  "problem" components you take a chance of creating issues with the majority of normal components.

--- End quote ---

I always use 0.1mm and have never had a problem of not enough paste.
jmelson:

--- Quote from: Kjelt on April 16, 2019, 07:13:14 am ---The possible problem with that choice is that you can get too little paste on the normal component pads.
So in order to facilitate the few  "problem" components you take a chance of creating issues with the majority of normal components.

--- End quote ---
Doesn't seem to be a problem.  I do 0603 and 0805 passives, and chips from SOIC down to 0.5 mm lead pitch regularly.  I use a .003" stencil.  If the apertures are the same size as the pads, I get solder balls near the middle of the passives, and plenty of solder to make good joints.  As the lead pitch goes down, I make the apertures smaller, down to about 50% of pad area (which is also kept pretty small)  to restrict the amount of solder.  This works pretty well.

Jon
coromonadalix:
At my job we use a paste with very fine solder balls in them,  we are able to solder qfn32 ic`s with no problems and very good results.  ill try to find the brand and specs,  it`s only a green pot  with nothing written on it,   purchaser secrets  loll

And the paste has to be put in a freezer at 4 degree celsius if we dont use it.
JVR:
Also, pony up for ENIG, HASL can sometimes be so uneven that it lifts the stencil locally, causing massive smudges.
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