1.00 mm Pitch, 4-Position SMT Header for Tight Board Layouts
The BM04B-SRSS-TB(LF)(SN) is a 4-position, single-row, surface-mount header from JST's SH/SR series. Its 1.00 mm pitch (0.039 in) sets the board footprint for dense routing — the narrow pitch keeps the connector body small, but the trace width and clearance between pads need careful attention during layout to avoid shorts.
SMT Termination with Solder Retention for Reflow Reliability
Surface-mount termination with the solder retention feature means the header stays put during reflow — the retention tabs anchor the part to the PCB pads, preventing tombstoning or shift from the solder paste wetting forces. This is a solid choice for automated pick-and-place assembly lines. If your enclosure has less than 5 mm clearance above the board, this connector will not fit; plan for at least 6 mm to allow for the receptacle body and wire bend radius. The natural (off-white) color helps with visual inspection after soldering.
Mating Half and Board-to-Wire Application
This header mates with JST's SR series crimp receptacles — the matching part is the SSM-xxT series housing (e.g., 04SR-3S for 4 positions) with the appropriate crimp terminals (SSHL-002T-P0.2 for 28-32 AWG wire). The board-to-cable/wire style makes this a wire-to-board interconnect — the header stays on the PCB, the receptacle terminates to a discrete wire harness.