Board-fit and pitch reality
The BM09B-SRSS-TBT: This is a 1.00 mm pitch, 9-position, single-row SMT header from the JST SH/SR series. The 0.039" (1.00 mm) pitch packs the circuits tight — the board footprint needs a matching 1.00 mm pad layout, and the 4-wall shrouding protects the pins during handling and mating.
