The MMBT4403 is a transistor of the SOT-23-3 package type manufactured by Youtai. It is a RoHS-compliant NPN/PNP transistor consisting of three leads in a tiny, surface-mount package. It features an Amplifier/Switch function with a DC current gain of up to 500. It has a maximum collector current of 500mA, a remarkable switching time of 150ns and an operating temperature of -55°C to +150°C. The collector-emitter voltage rating is 400V, the collector-base voltage rating is 500V and it has a power dissipation of 625mW. This versatile, low cost component is ideal for applications such as high frequency, low noise amplifiers, switching and motor control.