MR0A08B, MR0D08B, & MR0A16A 1Mb Parallel MRAM Everspin Technologies MR0A08B, MR0D08B, and MR0A16A are 1,048,576-bit magnetoresistive random access memory (MRAM) devices. The Everspin MRAM devices are available in a variety of specifications, such as dual supply, serial SPI, and organized as 131,072 words of 8 bits or 65,536 words of 16 bits. These MRAM devices are as fast 35ns or 45ns read/write timing cycles with no write delays and unlimited read/write endurance.