Which SMD-Resistor-Size is the right one ?

Using Arduino General Electronics
1

Hello falks,

I've baught these resistors from Aliexpress:

https://de.aliexpress.com/item/1005001794416354.html

My aim was to replace these "normal" type of resistors:

https://de.aliexpress.com/item/1005003117726705.html

But the Problem is: the SMD-Type resistors heights are like paper. I thought these SMD-Resistors are solid and hight enough in order to solder them properly. But they are like paper. My question is:

which ones have a solid dimension to solder them properly ?

2

There aren't SMD resistors the size of through-hole resistors as you seem to expect.

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3

It is apparent you have no experience with SMD technology. Those resistors are some of the mid size ones. Be glad you did not get something in the 0402 range they are a lot smaller.

For soldering them I use either a reflow oven or a hot air gun designed for this. I sometimes use my iron with an appropriate sized tip. There are some interesting tutorials/videos on hot air and reflow soldering watching them will help.

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4

Do you need to use SMD instead of through-hole?

If you want SMD resistors big enough to hand-solder, you may try using the 2512 1W size, but I doubt it will save you any money. The 2020 1/2W resistors are another option.

5

I solder 1206 types with ease using a pair of tweezers and a bit of solder paste and a soldering iron, (and a magnifying glass) can't quite see which size these ones you bought are.

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6

1206 SMD resistors are easy enough to solder by hand, just use a pair of tweezers.

Most surface mount was designed for machine assembly, where the small size is not such a problem.

7

None of them, because SMD is not designed for hand soldering.

However, the largest size 1206 is quite easy to solder by hand with some magnification and a little practice. The most useful tool I have found is a 10x binocular microscope, and I now can do 0603 but I still generally go for 0805.

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8

I was going to suggest 0805 (easy to hand solder under a 3x magnification glass), but then I saw you have bigger size already. Those are easy to hand solder - provided you have a decent soldering iron with small tip. Of course you're expected to solder them on a PCB, not attach leads to them or so.

I've once done 0402 by hand. The 8x microscope was pretty essential to see what I was doing. Very fiddly.

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