2.50mm Pitch, 4-Pin XH Header — What Bolts In
The B4B-XH-A(LF)(SN): This is a JST XH series 4-position male header, 2.50mm pitch, single row, through-hole mount. The shroud is four-wall — it protects the square pins and guides the mating receptacle home.
Mates with the JST XH series crimp receptacle housing — the detent lock on this header engages the housing latch for positive retention. No secondary TPA required; the lock holds against moderate vibration in panel wiring or small appliance harnesses.
The insulation height of 0.276" (7.00 mm) clears low-profile components on the daughter board.
Active Production — Sourcing This BOM Line
The part is ROHS3 compliant with a UL94 V-0 nylon 6/6 housing. No official second-source cross-reference exists, but the B4B-XH-AM variant (same pinout, adds a board guide) is a direct functional alternative if alignment aid is needed.
B4B-XH-A vs B4B-XH-AM — One Feature Delta
The B4B-XH-AM adds a board guide feature — a small alignment post on the housing that helps locate the header during assembly. Everything else is identical: 4 positions, 2.50 mm pitch, 3 A, 250 V, tin plating, detent lock, same mated stack height. If your pick-and-place or manual insertion doesn't need the guide, the base part saves the cost of an extra feature.