I have a pre-made motor controller which I want to re-purpose for a hobby project by pulling the MCU off and attaching to a custom control circuit (with a more powerful MCU, current sensors, etc). The MCU is a LQFP-48 7mm package (0.5mm pitch pins). It seems like attaching to standard SMT footprints is a reasonably common prototyping task, but I can't find any products designed to do this. What is the name of some kind of adapter/interposer/something which is designed to solder onto the PCB in place of the MCU, and how would I go about finding one of the right size?
I've found a similar product called 14 pin DIP to 14 pin SOIC/SOJ, but that's very generic and hard to search for more of. It's particularly hard to search for because there are a lot of products for going the other way (attaching a SMT IC to larger wires). Some pictures of similar products I found for reference:
Just a name and/or source for those little metal clips on the edges would be helpful too, so I can attach them to my own PCB.
Finding some kind of SMT 0.5mm-pitch header strip would work too (solder those to the existing PCB, and then to a PCB of my own on top), but I can't find any that small.
If anybody has other ways to achieve the same goal, I'm interested in suggestions there too. Some approaches I've already considered: Soldering wires directly to the pads is hard because they're tiny. Finding other places on the PCB to solder wires is kind of annoying because it's a lot of wires to attach, and some of the nets don't go very many other places. Getting a custom PCB with 0.5mm castellated edges made for cheap doesn't seem to be possible.