What this zener is and what it does
The 1SZ45A-AZ is a 6.4 V zener diode rated for 0.25 W of power dissipation.
Package and handling
The listing shows 'Bulk' under package, which refers to the shipping format — loose parts in a bag or tube, not a reel. The actual device case is a surface-mount package typical of small-signal zener diodes in this power class.
Lifecycle and sourcing reality
That means it can be specified into new designs without an immediate LTB risk. It is sourced through independent distribution, quoted to order against an RFQ.
