The ZM4757A is a 4-line ESD and surge protection device (SPD) manufactured by Semtech. It is constructed with Zener diodes LL-41 and is compliant with the EU's RoHS (Restriction of the use of certain hazardous substances in electrical and electronic equipment) directive. In a 2-line application, the ZM4757A provides an ESD clamp and TVS protection for USB ports, audio ports, data ports, and other high-speed ports from ESD, EFT, and lightning surge events. For a 4-line application, it provides ESD protection and ESD clamp for USB ports, audio ports, data ports, and other high-speed ports. The ZM4757A is designed to be used in automotive and industrial applications, and features a robust protection algorithm that can withstand up to ±8kV contact ESD and ±15kV air ESD. The device is provided in a 5-pin ESD-protected TSOT-23 package.