5 W autoresonant wireless power transmitter — what it is and where it fits
The LTC4125IUFD#PBF from Analog Devices is a 5 W autoresonant wireless power transmitter designed for contactless power delivery across an air gap. It operates from a 3 V to 5.5 V supply and draws a 1 mA quiescent current, making it suitable for battery-powered or low-standby-power systems. The part is rated over the full industrial temperature range of -40°C to 125°C, so it can live in an engine bay, a factory-floor sensor node, or an outdoor enclosure without derating. The QFN package (4x5 mm) keeps the board footprint small, and the exposed pad helps pull heat out when driving a transmit coil at the full 5 W.
Active lifecycle — no obsolescence risk for new designs
The LTC4125IUFD#PBF carries an Active lifecycle status and is ROHS3 compliant. There is no NRND or EOL notice, so it is safe to qualify into a production BOM today.
Package and mounting — design-in note
The part comes in a QFN Exposed Pad package (4x5 mm body) and is specified for surface-mount assembly. The Tube shipment format is typical for prototype or low-volume builds; for reel quantities, confirm the packing option with your supplier. The exposed pad must be soldered to a thermal land on the PCB to meet the rated power dissipation — a standard QFN footprint with a via array under the pad works.