The JST 40P3.5-JMCS-G-TF(N) is a 40-position plug from the JMC series, built with outer shroud contacts in a dual-row 0.50mm pitch layout. It's a surface-mount board-to-board interconnect designed for a 3.5mm mated stack height — the z-height budget that decides whether it clears the enclosure lid or the opposing board's tallest component.
Sourcing this obsolete part — what crosses when it's dry
This part is marked Obsolete on the official record. There is no listed direct replacement or cross-reference from JST within the evidence — no successor order code, no pin-compatible alternative named.
Mating half and termination basics
Termination is surface-mount only; the Tape & Reel packaging suits automated pick-and-place. The 0.50mm pitch means the PCB footprint needs tight registration — no hand-soldering this one. Gold on the contact finish gives good oxidation resistance for the signal path, but the mating cycle life is driven more by the shroud alignment than the plating alone.