What the 4000B family brings to a BOM
The 1 µA quiescent current keeps the power budget tight when the gates sit idle.
Propagation delay and output drive — what they mean for timing closure
With 50 ns propagation delay at 15V and 50 pF load, this is not a high-speed gate. You use it for control signals, enable lines, and status polling where the bus timing is in the hundreds of nanoseconds, not the single-digit range. The 3.4 mA source and sink current is enough to drive a CMOS input or a small LED, but it will not switch a relay coil or a MOSFET gate directly — plan on a buffer or driver stage for any load beyond a few milliamps.
No last-time-buy notice, no successor part number to chase. For a BOM that expects to run another five to ten years, this is one less obsolescence headache to track.
The 14-SOIC body is 3.90 mm wide — the narrow SOIC footprint, not the wide-body variant. Standard 1.27 mm pin pitch. No exposed pad, so the thermal path is through the pins only; keep the ambient below 125°C and the dissipation per gate under a few milliwatts and it stays happy.