9-Position YL Series Plug Housing
The JST YLP-09V is the 9-circuit plug housing from the YL series, a 4.50mm-pitch wire-to-board interconnect system. Typical use is in consumer and industrial harnesses where the 4.50mm pitch balances routing density with enough creepage for moderate-voltage DC power distribution.
Pitch and Layout
The 0.177" (4.50mm) pitch is the critical board-layout dimension for the mating header footprint. It is wider than the 2.54mm standard, giving more room for wire routing and terminal insertion in harness assembly. The 3-row arrangement packs 9 positions into a compact face — verify the mating header's row count matches before specifying.
The housing operates from -25°C to 90°C. The free-hanging (in-line) mount lets the housing float on the harness rather than fixing to a panel.
The YLP-09V carries 9 positions across 3 rows. The YLP-12V is the 12-position 3-row sibling at the same 4.50mm pitch — same housing style, same latch lock, same contact family.