The MMBT5551 with Transistors (NPN/PNP) SOT-23 RoHS manufactured by FUXINSEMI is an electronic part designed for switching and amplification applications. It is a small size low power consumption bipolar junction transistor (BJT) with a small surface-mount package. It has two versions: NPN (unipolar) and PNP (bipolar) transistors, in a SOT-23 3-lead package. It features a high current gain (hFE), fast switching speed, low collector-emitter saturation voltage, low input and output capacitance, and low noise. It has an operating temperature range of -65°C to 150°C and is RoHS complaint. This versatile BJT can be used in a wide range of applications including consumer electronics, industrial, and automotive applications.