The RW1990 iButton key tag is a durable, rewritable key designed as a reliable replacement for the Dallas DS1990A-F5 / TM1990A-F5 family. It uses the 1-Wire protocol, allowing secure data transfer through a single conductor, ensuring quick and accurate communication with contact devices. Each key contains a 64-bit unique identification code that can be easily rewritten for multiple applications.
Constructed with a stainless steel cover and a durable ABS/POM plastic holder, the RW1990 key offers strong resistance against magnetic and static fields. It is widely used in door intercom systems, access control systems, security systems, and other electronic identification solutions. With a long lifespan, lightweight design, and color-coded holders available, these iButton keys are a practical and cost-effective choice for secure access management.