Hex inverter for wide-voltage, harsh-environment logic
The Texas Instruments CD4009UBE is a 4000B-series CMOS hex inverter with six independent inverter gates, each with a single input. It operates from a 3V to 18V supply, making it a direct fit for 5V, 12V, and 15V logic rails without external level translation. The through-hole 16-DIP package suits prototyping, repair, and legacy designs that avoid surface-mount assembly. Quiescent current maxes at 4 µA, so it adds negligible load to a power rail in always-on or battery-backed sections.
Maximum propagation delay is 60 ns at 15V with a 50 pF load. That is slow by modern 74AC or 74HC standards, but entirely adequate for level-shifting, clock division below a few MHz, and control logic where timing margins are generous. At 5V the delay will be longer — budget 100–120 ns for worst-case timing closure if running from a 5V rail. The output can source 1.5 mA and sink 24 mA per pin. The sink current is strong enough to drive a standard LED or a low-current relay coil through a resistor; the source current is limited, so pulling up a bus line requires an external pull-up resistor for most loads.
Through-hole 16-DIP: board fit and handling
Package is 16-DIP (0.300", 7.62mm) with a 16-PDIP supplier device package. The through-hole mounting is compatible with breadboards, prototype PCBs, and legacy boards that use DIP sockets. No special reflow profile is needed — hand-solder or wave-solder with standard leaded or lead-free process.
There is no official successor because it remains in the TI catalog.