What the CD4089BF3A does on the board
The CD4089BF3A is a CMOS binary rate multiplier from Texas Instruments — it takes a clock input and produces an output pulse train whose frequency is a programmable fraction of the input, set by a 4-bit binary code. This is the kind of function you reach for when you need a digital divider with a selectable ratio, not a fixed divide-by-N counter. It sits in the Discrete Semiconductors category, but functionally it is a medium-scale integration logic part — think frequency synthesis, baud-rate generation, or pulse-rate modulation where the ratio changes on the fly.
Package and production status
The package is Bulk — loose units in an anti-static tube or bag, not tape-and-reel. For a through-hole DIP-style CMOS logic part, Bulk is the standard delivery format for prototyping and low-volume production. One critical flag: the CD4089BF3A is RoHS non-compliant. If your BOM requires RoHS-10 or RoHS-6 exemption-free compliance, this part does not meet it. The lead-bearing finish is typical of older CMOS logic in hermetic or high-reliability packages.
Sourcing and compliance documentation
Texas Instruments provides the standard datasheet and application notes for the CD4089BF3A through its product folder. Because the part is Active, the documentation set is maintained and current.