The BC848B from Hunan Jingxin Microelectronics is a Bipolar Junction Transistor with Collector Base Voltage 30 V, Continuous Collector Current 100 mA, DC Current Gain 200 to 450, Gain Bandwidth Product 100 MHz, Power Dissipation 0.2 W. Tags: Surface Mount, NPN Transistor. More details for BC848B can be seen below.