SFP Cage for Board-Edge Optical Modules
The TE Connectivity 2227303-1 is an SFP cage, the metal enclosure that receives a pluggable SFP transceiver module. It is the board-mount half of the SFP interconnect — the cage provides the mechanical alignment, EMI containment, and the mating interface for the module's edge connector. The cage is EMI shielded, a necessary feature for SFP applications operating at multi-gigabit data rates where radiated emissions from the high-speed serial lines must be contained within the chassis. The shield contacts on the cage mate with the panel cutout and the module's shell to complete the Faraday cage around the signal path.
Termination is solder — the cage's through-hole press-fit tails and alignment posts are soldered into the PCB. The PCB footprint includes plated through-holes for the cage's ground pins and alignment posts, plus the surface-mount pads for the SFP connector's signal contacts (the connector is typically a separate component loaded into the cage).
Comparison to 2227302-3
Both are SFP cages with the same through-hole right-angle mounting and EMI shielding. The only documented difference is packaging: the 2227303-1 ships in a Tray, while the 2227302-3 ships in a Box. The functional fit, footprint, and module compatibility are identical — the packaging distinction matters only for your assembly line's feeder or kitting process. If your BOM specifies one and the other is available, the swap is packaging-deep, not design-deep.