The MMDT4401 from Hunan Jingxin Microelectronics is a Bipolar Junction Transistor with Collector Base Voltage 60 V, Continuous Collector Current 600 mA, DC Current Gain 100 to 300, Gain Bandwidth Product 250 MHz, Power Dissipation 0.2 W. Tags: Surface Mount, NPN Transistor. More details for MMDT4401 can be seen below.