MX29F400CBMI-90G/TUBE is a 4M-bit non-volatile static RAM manufactured by Macronix. It features a size of 8-pin SOIC and PDIP packages, fast flash erase/program cycle time of 260µs, low power dissipation at 1.6mA/MHz at 5V, and four write protection options. It supports two supply voltage ranges and is available in two densities, either 32K x 8-bit or 64K x 8-bit. It is commonly used in embedded systems, networking, sensors, automation, and instruments.