MCP73831T-2ACI/OT

MCP73831T-2ACI/OT is a Microchip single-cell Li-Ion/Li-Polymer linear charge management controller in 5-pin SOT-23, tape-and-reel packing (T) — 4.20 V preset regulation voltage (2 = 4.20 V), programmable charge current from 15 mA to 500 mA via one external resistor, constant-current/constant-voltage algorithm with selectable preconditioning and charge termination, tri-state charge-status output, thermal regulation that folds back current before the die overheats, automatic power-down and reverse-discharge protection, 3.75–6 V input, −40 to +85 °C (I grade). The single-resistor programming is the selection point: one resistor sets the full charge current, and the thermal regulation keeps the tiny SOT-23 from tripping its own thermal shutdown when charging at high ambient — a complete USB-powered single-cell charger in five pins for wearables, Bluetooth accessories and handheld instruments. Selection advice: the code decodes as T (tape and reel) + 2 (4.20 V) + AC (option set) + I (industrial) + OT (SOT-23-5) — the MCP73832 is the sibling without automatic charge termination (open-drain status output), so pick the 73831 when the charger must terminate on its own. Microchip lists MCP73831T-2ACI/OT as In Production. Evidence: Microchip MCP73831/2 datasheet (DS21984) and distributor listings confirm 4.20 V, 15–500 mA, CC/CV, SOT-23-5 and tape-and-reel packing. Match the full MCP73831T-2ACI/OT code.