BCM87800A1KEFBG is an Broadcom ethernet PHY.
An Ethernet PHY converts between the digital MAC interface and the physical cable signalling.
It is used in networking equipment and industrial gateways, where the part has to hold its specification over the life of the equipment.
The closest other ordering code is BCM87400A1KRFBG, which differs in ethernet rate (400GbE against 800GbE).
The data sheet also fixes 7 nm CMOS and 8 system-side lanes to 8 line-side lanes.
For this ordering code the system side signaling is 8 x 106 Gb/s PAM-4 at 53 Gbaud in 800GbE mode.
Its advantage is that the specification is published and stable, so the design does not depend on bench characterisation.
