The STN3NF06L: The gate threshold is specified at 2.8 V max with 250 µA drain current. On-resistance is guaranteed at 5 V and 10 V drive. Total gate charge is 9 nC at 5 V, and input capacitance is 340 pF at 25 V drain.
Temperature range and environment — where it goes
The SOT-223 package is a surface-mount part with a large tab for heat sinking — the 3.3 W dissipation limit assumes the tab is soldered to a copper area on the PCB. For continuous 4 A operation, the board copper and airflow must keep the junction below 150°C.
