The JST XARP-09V is the 9-circuit receptacle housing in the XA series, a wire-to-wire interconnect family built around a 2.50 mm pitch.
The Pitch and Position Count — What Drives the Fit
At 2.50 mm pitch, this is a standard-density wire-to-wire connector — not as tight as the 1.25 mm or 2.00 mm families, which means the crimp terminals have more room for the wire barrel and the housing walls are thicker. Nine positions in a single row gives you a compact but not cramped footprint: the housing body is about 22.5 mm wide, which fits comfortably in a harness junction box or behind a dash panel. The 9-circuit count matches a 9-wire bundle exactly — no unused cavities, no need for dummy plugs.
Contacts Not Included — What You Actually Need to Order
The housing ships empty. A 9-position housing needs 9 terminals plus the mating header pins. If you are building a harness from scratch, add the terminals to the BOM before the crimp station stops for a shortage.
The XARP-08V shares the same 2.50 mm pitch, single-row layout, latch lock, and PA66 housing — the only difference is 8 positions against the 9 of the XARP-09V. If your harness has 8 wires, the 8-position housing saves one cavity and keeps the body 2.5 mm narrower. For a 9-wire bundle, the XARP-09V is the correct fit; you cannot leave a cavity empty in a single-row housing without a terminal position assurance (TPA) issue on some mating headers.