The MMBT2222A can operate safely between -55°C and 150°C, but the recommended operating temperature range is -40°C to 125°C.
To ensure linear operation, the MMBT2222A should be biased with a collector-emitter voltage (Vce) between 1V and 10V, and a base-emitter voltage (Vbe) between 0.6V and 0.8V.
The MMBT2222A can handle a maximum continuous collector current (Ic) of 600mA, and a peak current of 1A for a short duration.
To protect the MMBT2222A from ESD, handle the device by the body, use an anti-static wrist strap or mat, and store the device in an anti-static bag or container.
Yes, the MMBT2222A can be used as a switch, but it's not recommended due to its relatively low current gain (hFE) and high saturation voltage (Vce(sat)). A dedicated switching transistor like the MMBT3904 would be a better choice.