The Texas Instruments 74LVC1G125DBVTG4 is a single-bit, non-inverting buffer with a 3-state output, part of the 74LVC logic family. It operates across a supply range of 1.65 V to 5.5 V, making it suitable for mixed-voltage systems where a 3.3 V core interfaces with a 1.8 V or 5 V peripheral. The output enable (OE) pin, active low, places the output in a high-impedance state, allowing multiple devices to share a common bus without contention.
The 74LVC1G125DBVTG4 sources and sinks 32 mA at both high and low output states. This symmetric drive capability is sufficient to drive a single TTL load or a short unterminated trace on a backplane. For longer traces or higher fan-out, the 32 mA limit sets the maximum capacitive load at a given switching frequency — a 50 pF load at 50 MHz will draw roughly 8 mA dynamic current, leaving headroom for DC loads. The 3-state output allows the buffer to be disconnected from the bus when not selected, which is essential in shared data lines or multiplexed address buses.
SOT-23-5 package — footprint and layout notes
The five-pin footprint occupies approximately 3 mm × 3 mm on the board, with a 0.95 mm pin pitch. The SOT-23-5 is a standard surface-mount package compatible with reflow soldering and is widely second-sourced across the industry.