The 1.5KE200A-E3/54 is an ESD Suppressors / TVS Diodes device manufactured by Vishay. It is a unidirectional device with a peak power rating of 1500W and voltage of 200V. This device is used to protect electronic devices from the damaging effects of ElectroStatic Discharge (ESD). It is composed of a low-voltage protection element within a case which clamps the signal line to a safe level, providing a low-impedance path to ground and preventing damaging currents from entering sensitive electronic components. This device is designed to meet the IEC 61000-4-2 standard for ESD immunity.