6.4 V Zener, 0.25 W — what the ratings mean for your BOM
The 1SZ47A is a 6.4 V Zener diode rated for 0.25 W power dissipation.
For a BOM line this means you can qualify it into a new design without worrying about a forced redesign mid-production.
Bulk packaging — what it tells you
Bulk typically means loose parts in a bag or tube, not taped on a reel. This suits low-volume builds, prototyping, or hand-insertion where a pick-and-place feeder is not needed.