Open-drain hex inverter for wired-OR and level translation
The Texas Instruments SN74LV05ADR is a hex inverter from the 74LV low-voltage logic family, with six independent inverter gates each featuring an open-drain output. The open-drain topology means the output can only sink current (12 mA per the datasheet) and cannot source it — the output transistor pulls low, and an external pull-up resistor is required to bring the output high. This makes the part fundamentally different from a standard push-pull inverter, which actively drives both high and low states. The supply range spans 2 V to 5.5 V, and the propagation delay is 7.5 ns at 5 V with a 50 pF load. Operating temperature covers -40°C to 85°C, suitable for industrial control, telecom infrastructure, and general-purpose board-level logic where the open-drain feature is needed.
What the open-drain output means for your design
The open-drain output is the key functional differentiator. Because the output is a floating high-impedance state when off, multiple SN74LV05ADR outputs can be connected to a single pull-up resistor to implement a wired-OR or wired-AND bus — common in interrupt lines, I²C-like signaling, or shared reset lines. The 12 mA sink capability is enough to drive a standard LED or a low-power relay coil with an appropriate series resistor, but the lack of source current means the part cannot directly drive CMOS logic inputs without an external pull-up.
Lifecycle and sourcing reality
The SN74LV05ADR is listed as Active in production with ROHS3 compliance.
Package and footprint
The part is supplied in a 14-SOIC package (0.154" body width, 3.90 mm width) with a surface-mount footprint. The supplier device package is 14-SOIC. The Tape & Reel option (TR) is standard for automated assembly; Cut Tape (CT) is also available for prototyping or low-volume builds.