The TE Connectivity 5145154-4 is a 120-position female card edge connector from the Standard Edge.050 series, designed for PCI add-in card interfaces. The natural thermoplastic housing includes a board guide feature that aligns the card during insertion, protecting the 120 contacts from off-axis stress.
The 120-position count is the primary BOM line match — this connector is for a full-width PCI card with 120 edge pads. The dual readout means the connector has two rows of contacts, one for each side of the card, laid out in a staggered solder tail pattern for through-hole mounting. Gold this thick handles the wipe action of card insertion without exposing the base metal.
The board guide feature is a molded plastic alignment post at each end of the connector body; it engages slots in the PCI card before the contacts touch, so the card slides straight in without bending a contact. The through-hole tails give a stronger mechanical bond to the PCB than a surface-mount version would, important for a connector that sees card insertion force.