Lifecycle and sourcing reality
The 54LS156DMQB is listed as Active in the lifecycle status. For a BOM line that needs this exact military-grade decoder/driver, there is no LTB or EOL clock ticking — it is a current-production part, not a surplus-only find.
What the Bulk shipping form means for your stockroom
That is typical for DIP-packaged logic in lower-volume builds. If your pick-and-place line expects reels, you will need to hand-place or use a tube feeder; Bulk is the standard for prototyping, repair, and small-batch production.
