AT25128B

The AT25128B is a 128K-bit (16K x 8) serial flash memory device manufactured by Microchip Technology, designed for low-power and high-reliability applications. It operates with a single 2.7V to 3.6V power supply, making it suitable for battery-powered systems where energy efficiency is critical. The device supports standard SPI (Serial Peripheral Interface) mode, allowing for easy integration into existing microcontroller-based designs without requiring additional hardware. This memory features fast read speeds of up to 40 MHz, enabling efficient data retrieval in real-time applications such as firmware updates, configuration storage, and logging. It also includes sector-based erase capabilities—individual sectors can be erased independently, offering flexibility in data management. The AT25128B supports both byte and page write operations, with a maximum write cycle time of 5 ms per page (256 bytes), ensuring rapid programming while maintaining data integrity. Built-in protection mechanisms include write-protect pins and status register bits that allow users to lock specific regions of memory from accidental modification. The device has a robust endurance rating of 100,000 erase/write cycles and retains data for up to 200 years at 85°C, making it ideal for long-term storage in industrial and automotive environments. Its wide operating temperature range—from -40°C to +85°C—further enhances its suitability for harsh conditions. The AT25128B is commonly used in embedded systems such as consumer electronics, medical devices, industrial controllers, and communication modules. It serves as an efficient non-volatile memory solution for storing boot code, calibration data, user settings, and other persistent information. With a compact 8-pin SOIC package, it offers space-saving integration in densely populated PCBs. Microchip’s commitment to quality and reliability ensures the AT25128B meets industry standards for EMI immunity, electrostatic discharge (ESD) protection, and radiation tolerance in certain configurations. Its compatibility with various development tools and support from Microchip’s ecosystem further simplifies design implementation and reduces time-to-market.