The P6KE9.1CA is a 45.5A 13.4V 8.65V 7.78V Bi-Directional DO-15 TVS (transient voltage suppressor) diode. It is manufactured by the Yenji Corporation and is compliant with RoHS (Restriction of Hazardous Substances) environmental regulations. This bi-directional TVS diode offers circuit protection from a wide variety of electrical transients, including induction (lightning), surges, and electrostatic discharge, by clamping the voltage level down to a safe level. It has a working peak reverse voltage (Vpk) of 13.4V and a breakdown voltage (Vbr) of 8.65V for reverse current protection and a breakdown voltage (Vbr2) of 7.78V for forward current protection. Additionally, its clamping voltage (Vc), or the maximum voltage that it can safely support, is less than 45.5V. This diode is packaged in a standard DO-15 Plastic body, and it comes with suitable mounting hardware. It is typically used in automotive, communications, and electrical equipment to protect against transient overvoltage.