MMBT4403 is an NPN transistor, manufactured in SOT-23 package with 3 pins by High Diode. It is RoHS compliant and offers well-balanced hFE, and low noise. It is used for general purpose switching and amplification applications. It has a maximum collector current of 0.2 A and can withstand a voltage up to 40V. It also has a gain bandwidth of 250MHz and a transition frequency of 180MHz. It can be operated in forward active region and provides high switching speed, high linearity, and low power consumption.