MMST2222A is a NPN small signal surface mount transistor manufactured by Diodes Inc., with a SOT-323 package, the maximum collector-emitter voltage is 40 V, the maximum collector-base voltage is 75 V, the maximum emitter-base voltage is 6.0 V, the maximum collector current is 600 mA, the maximum power dissipation is 200 mW, the maximum thermal resistance is 625 °C/W, and the operating temperature range is -55 to +150 °C