16nm 50GbE PAM-4 PHY (1:1) or (2:1)

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The Broadcom BCM81118 is a single-chip low-power, low-latency PAM-4 PHY integrating retimer and equalizer functions supporting 50GbE applications.  In 50GbE mode, the BCM81118 retimes, and equalizes a 1×50G PAM-4 or 2×25G NRZ host side signal lanes into a 1×50G PAM-4 line-side signal to drive optical PAM-4 links inside next generation modules, including SFP56.  On-chip clock synthesis is performed by a low-cost 156.25 MHz reference clock via high-frequency, low jitter phase-locked loops (PLLs).  The BCM81118 is fabricated in advanced low-power 16 nm CMOS technology and is available in a RoHS-compliant package.


  • 50GbE (1×50G) PAM-4 PHY 
  • Host side: 1×50G PAM-4 or 2×25G NRZ
  • Line side: 1×50G PAM-4
  • Repeater and gearbox modes (no FEC)
  • CEI-28G/56G MR compliant  
  • Integrated host side AC-coupling caps 
  • Line-side and client-side loopbacks
  • Supports both MMF & SMF fiber links 
  • Low-power 16 nm CMOS design



  • 50GbE (1 × 50G) PAM-4 links for MMF/SMF
  • 50GbE SFP56 module form-factors.

Lifecycle Status


Specification Value
Lifecycle Active
Distrib. Inventory No
PHY Type 100GE
Product Brief28 i