i would like to request some advice on manually dispensing paste for super fine pitch components.
first some background. i am a small design house and specialize in sub-miniature prototypes for avionics. so far, i have mostly used stainless steel stencils (0.07mm) to deposit paste onto my proto boards. i have been using pretty standard paste (kester R276) and that all works fine.
the problem with the stencils is that i sometimes have to do one-off designs and would like to avoid the cost for the stencil.
in addition to the cost issues for stencils, i would like to venture into the world ob BGA, WLCSP, and other super fine pitch footprints and have tried to dispense the paste i have thru 0.2mm needles but that didn't work due to mesh size and viscosity.
here now my questions:
can someone recommend some specific paste and source to dispense 0.2mm dot paste manually.
what i have found out so far is that there seems to be a type "6" paste with mesh size of 5-15um which should go thru a 0.2mm needle but i haven't been able to find a source for this paste in the US (small syringes).
any advice on this subject appreciated.
thanks in advance, -r
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