What this 1.20 mm pitch header is built for
The BM03B-ACHSS-GAN-TF: The 1.20 mm pitch (0.047 in) sets a compact board footprint — each contact carries 2 A maximum at 50 V, which is typical for signal-level interconnects rather than power distribution. The housing is shrouded on three walls, which protects the blade contacts during mating and prevents misalignment.
This is a surface-mount, right-angle header. The 1.20 mm pitch means the PCB footprint is dense: trace escape between pads requires careful routing, typically on a single layer with narrow traces.
The detent lock engages with a corresponding ramp on the receptacle, providing a positive hold. The 3-wall shroud guides the receptacle into alignment and protects the male blades from damage during handling.