It is packaged using the Tape & Reel (TR) method since it is a clock IC. CLOCK GENERATOR, PROCESSOR SPECIFIC uPs/uCs/peripheral ICs are incorporated in this digital clock generator.
SI5351A-B04349-GTR Features
SI5351A-B04349-GTR Applications
There are a lot of Silicon Labs SI5351A-B04349-GTR Clock Generators applications.