Electronics > Beginners

Soldered 0805 vs 0603 vs 0402 vs 0201 vs 01005 vs 008004 today :)

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PixieDust:
How would you go about making a matrix of 0.65mm x 0.35mm (I think these are called 0201)? With pads underneath? :-// From what I'm seeing:
1.) A reflow oven would be necessary
2.) Solder paste and a stencil/template

but how would go about arranging the actual 0.65mm x 0.35mm components?

Pedro147:
I just completed the Hackaday SMD Challenge which had two 0201 components on it and I just used solder paste applied with a fine needle and hot air.

Admittedly I do have a reasonable Amscope microscope which for me is essential - old eyes syndrome  :)

Rerouter:
To PixieDust

http://www.resistorguide.com/resistor-sizes-and-packages/

In the middle of the page is the land pattern.

as the land pattern allows the component to move +- 0.3mm while still connecting, I would likely use a 0.3mm courtyard lengthwise, and a 0.15mm courtyard widthwise,  (exclusion gap around the component), to prevent nearby parts forming against each other,

PixieDust:
Ah so metric vs imperial fair enough.

My problem is that I'm trying to cram the LEDs into a matrix. They are right next to one another and their pads are underneath. I've been doing additional research and it seems like a pick and place machine would be the only option. Especially when talking about the quantities of LEDs that I'm talking about ~4000.

Rerouter:
for a 4000 LED array, 100% i would say use a pick and place machine, the IPC footprint standards are in place to maximize yield of placed components, e.g. reducing tombstoning, and cross pad skew,

for these standards, there are still options, e.g. least, nominal and most, referring to the sizing of the pads, least having only the exact minimum amount of pad the component needs, but risks lower tolerance to small placement issues, and variation in the thickness of your solder paste layer,

e.g.
https://blogs.mentor.com/tom-hausherr/blog/2010/09/22/pcb-design-perfection-starts-in-the-cad-library-part-2/


If your confident in your manufacturers capabilities you can always push past these recommendations, but again, your yield may suffer.

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