The maximum operating temperature range for the STD12NF06T4 is -40°C to 150°C.
To ensure proper biasing, connect the gate to a voltage source through a resistor, and connect the source to ground through a resistor. The recommended biasing voltage is Vgs = 10V, Vds = 15V.
The maximum current rating for the STD12NF06T4 is 12A.
Use a voltage regulator to regulate the input voltage, and add a current limiting resistor or a fuse to prevent overcurrent. Additionally, consider using a TVS diode or a zener diode for overvoltage protection.
Use a multi-layer PCB with a solid ground plane, and keep the power traces short and wide. Place the MOSFET close to the power source, and use a Kelvin connection for the source pin.