Where's the power? 0402 good for 63mW. I can't work with little pepper flakes, too small for my eyes and the slightest bump sends them flying.
It's weird one consumer product drives the entire electronics industry towards the smallest parts, to the extinction of engineers being able to prototype something. In that sense, blue resistors are awesome.
I think so far there is a wide range of components available on the market: from beefy current shunts, to parts less than 0201. I use all of them (I mean both th and smd), TH for breadboarding and when I have to dissipate a lot of heat (hello to-220 and to-247), and 0603 when I have a pcb and I want to save some board space. I used to use 0805, but they are "too big"
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In my next project I'll try using 0402. I already have experience soldering them with a naked eye (on training smd boards). With a bit of practice it was actually not hard at all. But I wouldn't go smaller, at least not now.
I also have 0204 capacitors (reverse geometry), which I thought would be a great idea for bypassing digital circuits. But looking at the size of their pads, I'm not sure I'll manage. They are too tiny for me, and it looks like they are easy to short with excessive solder. So, probably, I'll use 0306.
I want to buy this kit, but it's not available:
https://www.tindie.com/products/MakersBox/smd-challenge/ . May be I should just make my own version...
My advise for people who are afraid of smd because of the size: it's much easier than it looks, up to 0603 requires no special skills. 0402 a bit trickier, I suggest practice on an "smd training kit" before working with them on actual equipment.
PS smd tweezers are awesome. Can be used both for measurements and for placing if working with a stencil.