The BZT52C9V1S is a SOD-323 RoHS Zener diode manufactured by the company Bourne. This diode is designed to regulate voltage in electronic circuits and prevent over-voltage or reverse-voltage situations. It is housed in a SOD-323 package, making it perfect for small, highly-integrated applications. The BZT52C9V1S has a reverse breakdown voltage of 9.1volts, a power dissipation of 500mW, and a maximum reverse current of 5mA. It is RoHS compliant, meaning it is free of hazardous materials like lead, cadmium, and mercury.