The JST YLP-12V is the 12-circuit plug housing in the YL series, arranged across 3 rows on a 0.177" (4.50mm) pitch. The housing is white polyamide (PA66) and carries a -25°C to 90°C operating range, suited for industrial control cabinets, automotive interior harnesses, and outdoor equipment that stays dry.
Position Count vs. the 9-Circuit Sibling
The YLP-12V carries 12 circuits across 3 rows. The sibling YLP-09V shares the same 3-row layout and 4.50mm pitch but stops at 9 positions — three per row. If your BOM calls for 12 circuits, the YLP-12V is the match; the 9-position housing leaves three circuits unconnected. Both use the same crimp terminals and latch lock, so the only decision is the circuit count.
What the Latch Lock Means for Your Harness
The latch lock on the YLP-12V locks the plug to the mating receptacle. In a free-hanging harness subject to machine vibration or cable pull, this lock prevents the connector from walking loose.