Yesterday, I had the great pleasure to solder a tiny 4 x 4 mm op amp with 16 legs (AD8336).
I figured out that the best and fastest way to do it is
- to put solder with the soldering iron on every contact of the electronic board (top side)
- heat the bottom side of the electronic board with a heat gun
- use a needle to test if the solder is melted
- if it is melted place the op amp on the electronic board
- apply some vertical force on the op amp for proper contact and heat for 1 to 2 more minutes
- done
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