This is an 28 pin SMD to DIP adapter a perfect PCB if you do not want to solder your IC directly on the main PCB. 

Electronic components are either mounted directly on to the surface of a printed circuit board(surface mount or SMT) or have legs that go through holes drilled in the circuit board (through-hole or TH).

A surface mounts to through-hole adapter board allows you to use one kind of component on the other kind of board. What are surface mount (SMT) to through-hole adapter boards used for? SMT to through-hole adapter boards is mostly used in the prototyping of projects before any mass programming or assembly.

They facilitate the testing and modification of a circuit or device, allowing you to go debug and fix any issues with your prototype. Types of surface mount (SMT) to through-hole adapter boards SMT to through-hole adapter boards come in different sizes depending on your needs and can be single or double-sided.

Some have pre-scored brake lines to allow for the separation of individual modules from the board as a whole. 28PIN SMD TO DIP Adapter This is an 28 pin SMD to DIP adapter a perfect PCB if you do not want to solder your IC directly on the main PCB.