The ESD54191CZ is an electrostatic discharge (ESD) protection device manufactured by Leiditech. This device is an unidirectional silicon transient voltage suppressor (TVS) diode packaged in a 0603 lead-free DFN (Dual Flat No-lead) package with a lead-free RoHS compliant finish. It is designed to provide protection for electronic circuits against ES, ESD, and lightning induced transients. The device features low leakage current and low capacitance that helps to maintain signal integrity. It also has a fast response time and Zener breakdown voltage, which helps to limit the voltage seen on the protected side of the circuit to a safe level. The ESD54191CZ is suitable for a wide range of applications such as Wi-Fi, Bluetooth, Ethernet, USB, HDMI, and automotive infotainment systems. It also provides voltage clamping and high ESD immunity that is ideal for protecting against ESD and overvoltage conditions.