The CD4543BMT: That means it remains a valid line-item for new builds and ongoing production — no last-time-buy scramble, no forced redesign. The device is ROHS3 compliant, so it clears the regulatory gate for EU and most global markets without a waiver.
3V to 18V supply — the fit for mixed-voltage and battery systems
The 3V to 18V supply range is the headline spec that decides where this part lands. That 40 nA typical supply current means it adds negligible drain in a battery-backed meter or portable instrument that spends most of its life asleep. The operating temperature range of -55°C to 125°C covers military and industrial extremes — think engine-bay instrumentation, outdoor utility meters, or avionics panel displays. The wide temperature grade also gives headroom for self-heating in a sealed enclosure.
BCD input, LCD output — what the interface actually drives
This is a BCD-to-7-segment LCD driver, not an LED driver. The BCD input accepts four-bit binary-coded decimal from a microcontroller or counter, and the output drives the segments of a single-digit LCD. The LCD drive waveform is inherently AC-coupled — the CD4543B generates the backplane and segment signals internally, so you don't need external oscillator or level-shift components for the glass.
16-SOIC package — board-fit for automated assembly
The supplier device package is 16-SOIC, so the land pattern matches the JEDEC MS-012 variation. Tape & Reel packaging is the typical reel for volume production; Cut Tape (CT) is also available for prototype or low-volume builds. No exposed pad — standard SOIC-16 thermal management applies.