New ICs are a nightmare

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mvs sarma said:
I had bought few LMX2322 that has a special package
i was never able to manage to solder them.here is the package details
https://htmlimg2.alldatasheet.com/htmldatasheet/198776/NSC/LMX2322/774/13/LMX2322.png
Click to expand...
DerStrom8 said:
CSPs absolutely require solder paste and a reflow oven. They are physically impossible to solder by hand.
Click to expand...
Whilst I was looking for the instructable on drag soldering, I found one showing how you can solder those chips using a hot-plate:
https://www.instructables.com/id/Extreme-Surface-Mount-Soldering/
upgraded version:
https://www.instructables.com/id/Closing-the-Loop-on-Surface-Mount-Soldering/
 

I'm always hesitant to solder/reflow using a hotplate because they don't usually heat the board uniformly. This can cause the board to warp, possibly putting stress on the traces/pads/other components.
 
Food for thought. I also read about a hotplate someone made using several soldering iron elements plugged into an aluminium block. Don't know if it would be any more even.
 
throbscottle said:
Food for thought. I also read about a hotplate someone made using several soldering iron elements plugged into an aluminium block. Don't know if it would be any more even.
Click to expand...

Unless there was an aluminum block on the top and on the bottom of the board, I can't imagine it is. The warping is mainly caused if one side of the PCB is heated and the other is not.
 
DerStrom8 said:
I'm always hesitant to solder/reflow using a hotplate because they don't usually heat the board uniformly. This can cause the board to warp, possibly putting stress on the traces/pads/other components.
Click to expand...

Hi there,

I couldnt agree more. Voltage sensitive IC parts should have stress relief slots cut anyway near the IC body so if the board warps or is bent the part of the board directly under the IC does not bend much as flexing the board can change the electrical properties.
 
throbscottle said:
Food for thought. I also read about a hotplate someone made using several soldering iron elements plugged into an aluminium block. Don't know if it would be any more even.
Click to expand...

I actually did this! I used a PID controller from Ebay and bought a cartridge heater as well. Used to use them at work for heating up dies. I sort of custom machined my own block, it should be bigger but it works. a 150W Heater should be fine for small boards. Ideally you would want a Ramp/Soak PID controller..but those are +$75.
 
Hi,

Just to note, i dont think it would take too much to build a controller. Add some thermistors perhaps to sense current, or some other temperature sensors.
 
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