The MMDT2222A from Hunan Jingxin Microelectronics is a Bipolar Junction Transistor with Collector Base Voltage 75 V, Continuous Collector Current 600 mA, DC Current Gain 100 to 300, Gain Bandwidth Product 300 MHz, Power Dissipation 0.2 W. Tags: Surface Mount, NPN Transistor. More details for MMDT2222A can be seen below.