Quad buffer for bus isolation and signal distribution
The Texas Instruments CD74HC126MT is a 74HC-series CMOS quad non-inverting buffer with 3-state outputs, each channel handling one bit. It operates from a 2V to 6V supply, making it a drop-in for both legacy 5V logic and newer 3.3V systems. The 3-state outputs let you isolate multiple bus segments or drive shared lines without contention. With four independent buffers in a single 14-SOIC package, it consolidates board space compared to discrete transistor or gate-level solutions.
2V to 6V supply — fits mixed-voltage boards
The wide 2V to 6V supply range means this buffer works on 3.3V, 5V, or even unregulated battery rails without a separate level translator. The 7.8mA output drive at both high and low levels is typical for 74HC logic — enough to drive a few CMOS inputs or a short PCB trace, but not a heavy load like a relay coil. If you need more fanout, plan a buffer stage or use a higher-drive family like 74HCT or 74ACT.
The full military temperature range (-55°C to 125°C) qualifies this part for avionics, satellite, downhole drilling, or outdoor industrial gear where the board sees extreme thermal cycling. The 74HC family's CMOS construction keeps quiescent current low across temperature, so you don't lose much margin at the hot end.
Active lifecycle — no EOL scramble
The 74HC series is a mature logic family with multiple sources. If TI phases out this package, pin-compatible alternatives exist from other manufacturers.
14-SOIC footprint — standard and easy to route
The 14-SOIC (3.90mm body width) is a common surface-mount package. The 1.27mm pin pitch is easy to route on a two-layer board, and the package is widely supported by pick-and-place machines. No exposed pad means no thermal-via stitching — just standard soldering.