What this driver is and where it fits
The MAX3044CSE+ from Maxim Integrated is a quad RS-422/RS-485 line driver — four drivers, zero receivers on chip, so it is a pure transmit-side part. It handles 2.5 Mbps data rate on a 5 V ±5% rail (4.75 V to 5.25 V), and comes in a 16-pin SOIC (0.154" body width) for surface-mount assembly. The commercial temperature range (0°C to 70°C) suits it for indoor equipment like PLCs, building-automation controllers, and test gear that stays above freezing.
Supply rail and data rate — the so-what
The 4.75 V to 5.25 V supply means this driver expects a regulated 5 V bus, not a 3.3 V rail. If your board runs 3.3 V logic, you will need a level translator or a separate 5 V supply for the driver side. At 2.5 Mbps, the part can drive a few hundred feet of twisted-pair cable with proper termination — enough for most factory-floor serial links, but not the multi-megabit backplane speeds some newer transceivers offer.
Package and mounting — field-fit check
Housed in a 16-SOIC (0.154" width, 3.90 mm body), surface-mount only. No DIP option, so a socketed field swap means having a SOIC footprint on the board. The tube shipment (not tape-and-reel) is typical for engineering quantities; if you are feeding a pick-and-place line, confirm the reel-pack variant or plan to transfer from tube.
Lifecycle and compliance
ROHS3 compliant, so it clears the current EU restriction list without an exemption. No lead (Pb) finish concern for RoHS-driven BOMs.