What This Adapter Does in the Harness
The B2B-PH-TW-S (LF)(SN): The B2B-PH-TW-S (LF)(SN): The JST B2B-PH-TW-S (LF)(SN) is a 2-position plug-to-plug adapter from the PH series, designed to join two PH-series plug housings end-to-end. Both ends terminate in male pins, so it bridges two female receptacle connectors on separate cable assemblies — useful for extending a PH-series harness or creating a panel break without cutting wires.
At 2 positions and 2.00 mm pitch, this adapter matches the circuit count and contact spacing of a standard PH-series 2-circuit receptacle. The 2-position count is the BOM-critical line item — it must match the circuit count on both sides of the adapter. The 4-position sibling (B4B-PH-TW-S) uses the same 2.00 mm pitch and free-hanging format, but with 4 circuits for a wider harness. No other functional differences between the two; the choice is purely position count.