Bus-interface buffer for mixed-voltage boards
The SN74LVTH125DR is a 4-bit non-inverting buffer with 3-state outputs from the 74LVTH family, designed for 2.7 V to 3.6 V supply rails. Each of the four elements buffers one bit, and the 3-state output lets you disconnect the bus when the output-enable pin is deasserted — essential for shared data lines where multiple drivers talk on the same trace. It lives in a 14-SOIC narrow-body package (3.90 mm wide), a common footprint that fits many existing PCB layouts for 8- or 14-pin logic. The surface-mount package suits automated assembly lines and dense boards where through-hole is no longer an option.
Output drive and temperature range
The buffer sources 32 mA and sinks 64 mA per output — enough to drive a handful of CMOS inputs or a short unterminated trace directly. The asymmetric drive (stronger sink than source) is typical for 3.3 V logic where the low-level noise margin is tighter; the extra sink current holds the bus low against capacitive coupling. Rated for -40°C to 85°C ambient, the SN74LVTH125DR covers industrial enclosures, outdoor telecom cabinets, and automotive cabin electronics (though it lacks formal AEC-Q qualification). The 2.7 V minimum supply means it can run from a 3.3 V rail that droops under load or from a 2.8 V LDO without losing functionality.
Active production and compliance
The part ships in Tape & Reel (TR) or Cut Tape (CT) options, which matches standard pick-and-place feeders.