Active production, wide supply, military temp — the 4000B workhorse
The CD4011UBM: Packaged in a 14-SOIC (0.154", 3.90mm width) for surface-mount assembly, this is the part you reach for when you need a simple logic gate that survives harsh environments and wide supply swings — think avionics control logic, industrial sensor conditioning, or battery-backed power management where the rail might droop.
The 3V to 18V supply range is the headline feature that sets this part apart from lower-voltage logic families like 74LVC or 74HCT. If you're repairing a board that runs off an unregulated 12V battery or a 5V rail that sees transients, the CD4011UBM doesn't need a separate regulator — it works straight off the rail. The input logic levels scale with supply: low is 1V to 2.5V, high is 4V to 12.5V, so at 12V supply a TTL-level input won't reliably trigger it. That's the gotcha: if you're swapping this into a 5V-only design that expects 74HC thresholds, check the input drive levels first.