The MMBT4403 is a PNP 600mA 40V SOT-23 three-pin transistor made by Formosa. It is RoHS compliant and is designed for very low voltage applications. This device can be used in switching, amplifier, and oscillator circuits. It has a very low base-emitter saturation voltage and high switching speed, making it ideal for use in low-noise amplifier applications. It also offers excellent current gain linearity and good frequency response. Its small package size helps to minimize space requirements in crowded circuits. This device is suitable for use in a range of high-frequency basic circuit applications.