The MSM6636B is a high-performance memory component from OKI/Metcal. It is designed to provide fast and reliable data storage and retrieval capabilities. This component has a capacity of 4Mbit and operates at a speed of 35ns. It is a popular choice for use in a wide range of applications, including telecommunications, networking, and computing. With its limited supply and medium popularity, the MSM6636B is a highly sought-after component in the market. It is a great choice for any application that requires high-speed memory capabilities.