Digital input conditioner in a SOT-23-6 footprint
The MAX22191AUT+T is a single-channel digital input IC from Analog Devices, housed in a 6-pin SOT-23 package (also designated SOT-6 by the supplier). It accepts field-side 24 VDC signals from sensors or pushbuttons and presents a logic-level output to the controller — no external resistor dividers or optocouplers needed for the level translation. Targeted at automation control applications, this part replaces the discrete resistor-diode-optocoupler chain that typically occupies 30–50 mm² of board area with a single 3 mm × 3 mm IC. The SOT-23-6 footprint keeps the BOM dense and the routing local to the input connector.
The SOT-23-6 package has a 0.95 mm pitch — a standard two-layer PCB with 6/6 mil trace/space handles the fan-out without vias. RoHS3 compliance covers the full bill of materials — no exempt lead finishes or halogenated flame retardants. The part carries the standard Analog Devices marking; the laser-etched date code on the reel label should match the manufacturing plant's font and lot format for that quarter.
Lifecycle and compliance posture
No pin-compatible second source or functional equivalent is listed in the ledger. The MAX22191 family is a single-source Analog Devices part; for a multi-source BOM hedge, the design should accommodate a second footprint or an external discrete solution at the layout stage.