Single-gate buffer for bus isolation and level translation
The Texas Instruments 74AHC1G125DCKTG4 is a single-gate non-inverting buffer with a 3-state output, part of the 74AHC logic family. It operates from a 2V to 5.5V supply, making it suitable for mixed-voltage systems where a 3.3V or 5V bus needs isolation or enable control. The output can be placed in a high-impedance state, allowing multiple drivers to share a common bus line.
The 2V to 5.5V supply range covers 3.3V and 5V rails common in industrial and automotive electronics. At 2V it still switches, which matters for battery-powered or low-voltage core logic. Output drive is rated 8mA for both high and low states, enough to drive a single CMOS load or a short PCB trace. For longer lines or multiple loads, buffer fan-out should be checked against the input capacitance of the driven devices.
Package and footprint — SC-70-5
Housed in a 5-lead SC-70-5 (SOT-353) package, this part occupies minimal board area. The pinout is standard for single-gate logic: ground, supply, input, output-enable (active-low), and data input.