Active 4000B quad buffer — still a valid choice for wide-voltage logic
This part is an active-production device, ROHS3 compliant, and suited for designs that need a simple buffer stage in high-voltage or wide-supply-rail systems where lower-voltage 74LVC or 74AHCT families cannot reach.
Supply voltage range — the reason you pick this over a 74-series buffer
The 3V to 18V supply range is the headline spec that sets the CD4041UBMT apart from most 74-series buffers, which typically top out at 5.5V or 3.6V. If your design has a 12V or 15V rail and needs a non-inverting buffer, this part works without a separate level translator. The 38mA symmetric drive at both output high and low is enough to drive a few standard CMOS gate inputs or a small relay coil through a resistor, though for heavier loads you would add a transistor stage.
Temperature range — rated for the full military span
The 4000B series is known for wide temperature tolerance, and this part holds its parametric specs across that entire span. For a design that must survive cold soak or engine-bay heat, the CD4041UBMT is a straightforward choice.
For a 4000B series part that has been in production for decades, this is a stable sourcing position — no imminent end-of-life to plan around.