B4B-XH-A(LF)(SN)

B4B-XH-A(LF)(SN) is the 4-position top-entry through-hole header of JST's XH series — 2.5 mm pitch, vertical mount — as listed in JST's XH series catalogue. The series ratings from the same catalogue: current 3 A AC/DC (at AWG #22), voltage 250 V AC/DC, temperature range −25 °C to +85 °C, initial contact resistance 10 mΩ maximum. The (LF)(SN) suffix is JST's lead-free tin-plating designation and is part of the orderable code, shown on the product label. The selection point is the XH workhorse in a 4-circuit form — battery packs, small appliances and consumer boards standardise on this series. Selection advice: position count is in the code (B4B is four circuits; the 2-position B2B-XH-A(LF)(SN) also listed here is a different header, not a variant of this one), and the mating side is the XHP housing with SXH crimp contacts — confirm the full set in your RFQ.