The BC817-25 is a single NPN Transistor packaged in a SOT-23-3 package manufactured by SLKORMICRO. It features low noise, high gain, and low leakage current making it suitable for a wide range of applications including amplifiers, detectors, and switches. It is also RoHS compliant, meaning it contains no hazardous heavy metals such as lead, mercury, cadmium, and hexavalent chromium.