B4B-PH-SM4-TBT(LF)(SN) from JST Sales America Inc. is a rectangular connector used where compact, board-level wire-to-board interconnection is needed in space-constrained electronic assemblies. Parts in this category are commonly considered for consumer electronics, small industrial controls, embedded devices, and other designs that require dependable signal or low-power connections with a proven connector family footprint. For engineering teams, the value of this part is typically tied to JST brand familiarity, broad industry adoption, and suitability for dense PCB layouts where assembly consistency matters. Because the published lifecycle status provided here is unknown, designers should treat long-term supply planning carefully and confirm current manufacturer status before committing to new production builds. RoHS compliance information is not available from the input data, so environmental compliance should also be verified through the latest datasheet, manufacturer declarations, or authorized distributor documentation before qualification, regulatory review, or volume purchasing.