日本語
Hi, I'm designing my first pcb based project around arduino and want to use the same chip as in the arduino pro micro (atmega32u4). I'm planning to buy a load of arduino pro micros from aliexpress, remove the chips and solder them onto my board. This way is infact cheaper than buying the chips by themselves here in the UK, and they'll come preloaded with the arduino bootloader. My question is how hard will it be to resolder QFN44 chips, given they'll already have a bit of solder on the pins and I know they're very small. Apologies if this is a silly question, but I've never done any pcb rework before so I'm a bit new to all this. Thanks for your help 
- Comments(1)
A****min
Dec 03.2019, 18:32:09
If you've got a hot air station, it's a trivial task, as long as you've got some additional flux.
- Start by applying solder to your board (ideally solder paste, although you could tin the pads manually if that's the only option)
- Add additional flux to the board
- Heat up the donor board, pull off the IC with tweezers
- Place the IC on your new board, and apply hot air until it reflows
