What this 4-position Micro-MaTch receptacle is
The 215079-4: The 0.100" (2.54mm) mating pitch matches standard perf-board grids and sets the PCB footprint — each row is spaced 0.100" apart, so the 4-pin layout occupies two rows of two holes.
Through-hole mount with kinked, tin-plated solder posts. The post length is 0.122" (3.10mm) — enough for a standard 1.6mm PCB with the solder fillet forming on the bottom side.
ROHS3 compliant — no exemptions expired; the part is fully lead-free and suitable for RoHS-driven builds.