The PXT3904 from Hunan Jingxin Microelectronics is a Bipolar Junction Transistor with Collector Base Voltage 60 V, Continuous Collector Current 200 mA, DC Current Gain 100 to 300, Gain Bandwidth Product 300 MHz, Power Dissipation 0.5 W. Tags: Surface Mount, NPN Transistor. More details for PXT3904 can be seen below.