The 1.5SMCJ28CA_R1_00001 is a transient voltage suppressor (TVS) manufactured by Panjit, and it conforms to the Rohs standard. This component has a package type of DO-214AB, otherwise known as a SMC package. It can withstand fast transients with a peak pulse Power of 1500 W at 45.4V, 31.1V, and 28V ratings. This will protect vulnerable circuits from overvoltage damage in harsh environments.