The MMSZ5255A_R1_00001 part is a Zener diode manufactured by Panjit in a SOD-123 package. It has a voltage rating of 3K and is electrically rated at a maximum of 5W. It also has a small lead frame with a Zener Voltage, ZSM-05, ZSM05-QI24, and PJ. The device is suitable for a wide range of electronic applications, including voltage regulation, signal clamping, reverse bias protection, power rectification, and voltage surge protection. Additionally, it features a low leakage current and high reliability. The package is lead free and RoHS compliant as well.