The JST 24R-JMCS-GAN-TF is a 24-position receptacle from the JMC series, built with center strip contacts on a 0.020" (0.50mm) pitch. That pitch puts it in the fine-pitch range — the board trace and via escape between pads is tight, and the 2-row layout means the footprint occupies about 6 mm of board width for the contact area. The 0.091" (2.30mm) height above board sets the z-axis clearance for the mating header; if you are stacking boards, that is your gap between the PCB surfaces when mated.
Surface-mount termination for automated assembly
No through-hole solder tails to hand-solder or wave-solder — the assembly house places it on the paste and it goes through the oven. The Tape & Reel packaging (also available as Cut Tape) feeds directly into a pick-and-place machine, which keeps the per-unit placement cost low for volume builds.
Active production — no LTB watch needed
That means JST is still manufacturing it, no last-time-buy or end-of-life notice is in effect, and the supply chain for this order code is stable. For procurement, this is a straight BOM line item — no cross-reference scramble or surplus-hunt required.