The JST 100P-JMDSS-G-1-TF is a 100-position plug from the JMD series, using outer shroud contacts in a 2-row layout on a 0.020" (0.50mm) pitch. The gold-plated contacts and SMT termination with solder retention features suit it for high-density internal signal connections in compact electronics — think laptop mainboards, camera modules, or handheld instruments where the board stack height is tight and reflow assembly is the standard process.
Pitch, Positions, and the Board Footprint Decision
At 0.020" (0.50mm) pitch, this connector demands a fine-line PCB process — the trace-and-space capability on the board must support routing between pads that are half a millimetre apart. 100 positions in two rows means 50 contacts per row, giving a mating face roughly 25mm long. Compare that to the 80-position variant (80P-JMDSS-G-1-TF) at the same pitch: the 80-position part saves about 10mm of board edge and carries 40 contacts per row. The choice between them is driven by the number of signal lines the BOM requires — 100 circuits vs 80 circuits — and the board real estate you can allocate to the connector footprint.
Mating and Assembly Notes
This plug mates with the JMD series receptacle (the half with inner contacts). The 4.5mm mated stack height is fixed — there is no height adjustment, so the mezzanine gap between the two PCBs is locked at that dimension.