While there are many How to Solder tutorials, there are only a few that cover how to mount some of those tricky small pitched ICs. These .65mm and smaller pitches can seem overwhelming at first, but with the right equipment or even just enough patients they can be soldered, and with practice quite easily at that.
There are several different styles ranging from using small conical tips, to solder paste and re-flow, to drag soldering, but we will just cover drag soldering in this tutorial.
Soldering Station -Weller, Hakko, or similar type that has a good range of tips.(NTGW gullwing or T18-C2 bevel)
Solder -If you don't have some good quality solder do yourself a favor and pick some up, it is expensive but will last a very long time.
Flux -depending on your style and the part that is being soldered this may vary and some may prefer a tacky type to a liquid, I am using a Kester 2331-ZX type flux pen.
Clean Wipes- If your flux is the corrosive type you will want to clean up after the IC is finished, use some nice lint free wipes.
PCB and IC to solder!
The steps involved are really straight forward, and once you get the hang of this technique you will use those difficult ICs in more projects! The only real steps are 1) Position IC, 2) Tack or affix IC in place 3) Solder each side or pin!
Step 1: Initial Setup
Now is a good time to take some initial steps which will pay off later in the process. Heat up your iron and prepare the tip cleaning method(distilled water w/ sponge or brass sponge) Tip maintenance is an important step in keeping your Iron and tips in working order and maximizing the use of them, it is important to keep it clean and when stored always keep a nice blob of solder on the working edges of the tip.
Start by cleaning, tinning, and then cleaning the tip again. This will make sure it is ready to go, with a "pure" surface that will transfer heat evenly and quickly. Apply a fair amount of solder on the tip to keep it from oxidizing and place it back in the stand while we ready the rest of the steps.
First take one of the wipes and a bit of isopropyl alcohol and thoroughly clean the pad and area where our IC will be mounted. We don't want any dust, old flux or other contaminants interfering with our work!
After we have cleaned off the pads we can apply an ample amount of fresh flux, don't worry if it extends too much in any direction most will burn off and we will clean the rest in the last step!