AmpDrive AD0505C0Z is a 15-gram, 3.5x3.5 cm, 4~12S FOC ESC with up to 1.2 kW output power (45 A current amplitude). AD0505C0 is an even smaller version that weighs 13 gram with the nominal power output up to 850 watts (37 A current amplitude). An external heat sink is required for the full power output.
These are bare PCB models for tight integration into space- and weight-constrained systems. An IP69 model with a built-in heatsink will follow soon; stay tuned.
Datasheet and technical specs: https://files.zubax.com/products/com.zubax.telega/Zubax_AD0505[CD]_Datasheet.pdf
Purchase: https://shop.zubax.com/collections/motor-controllers/products/ampdrive-ad0505c-d-esc