Adesto Technologies

AT25DF081A-SH-T

A: The AT25DF081A-SH-T offers low power consumption, flexible erase architecture, and high reliability. The table below summarises its core specifications: Specification Value Memory Density 8 Mbit (1 Mbyte) Memory Organization 1M × 8 bits Interface SPI (Mode 0 and Mode 3) Max Clock Frequency 100 MHz (for read commands) Dual‑Output Read Up to 200 MHz equivalent Page Size 256 bytes Page Program Time 5 ms (max) Sector Erase Time (4KB) 50 ms (max) Block Erase Time (32KB) 150 ms (max) Chip Erase Time 10 s (max) Supply Voltage (VCC) 2.7 V to 3.6 V Active Read Current 8 mA (typical) Standby Current 6 µA (typical) Write Endurance 100,000 cycles Data Retention 20 years Operating Temperature –40°C to +85°C (industrial grade) Package 8‑pin SOIC (150 mil) RoHS Status RoHS compliant, lead‑free Additional features include: Uniform 4KB sectors, 32KB blocks, and 64KB blocks for flexible erase. Security register with 128‑bit OTP (One‑Time Programmable) area. Hardware write protection via WP pin. Software write protection with status register block protection bits. Deep power‑down mode (0.3 µA typical) for ultra‑low standby power.

A: The device uses a standard 4‑wire SPI bus, supporting SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1) for maximum compatibility. The interface consists of: CS (Chip Select): Enables the device when driven low. SCK (Serial Clock): Provides the clock signal for data transfer (up to 100 MHz). SI (Serial Data Input): Transmits data from the host to the device. SO (Serial Data Output): Transmits data from the device to the host. In addition to standard SPI, the device supports Dual‑Output Read mode, where both SI and SO pins are used as data outputs (IO0 and IO1) to double the read throughput without increasing clock frequency. The device includes a HOLD pin to pause communication without resetting the ongoing instruction, useful in multi‑device SPI systems. The WP (Write Protect) pin, when tied low, disables write operations to protected blocks (as defined by status register bits).

A: The AT25DF081A-SH-T is engineered for long‑term reliability. Key reliability specifications include: Write Endurance: 100,000 program/erase cycles per sector (minimum). Data Retention: 20 years (minimum). Page Program Time: 5 ms (max) – self‑timed. Sector Erase Time: 50 ms (max) for 4KB sectors. These figures are typical for NOR Flash technology. The device also features built‑in ECC (Error Correction Code) to further enhance data integrity. For applications requiring more frequent writes (e.g., data logging), the uniform small sector size (4KB) allows efficient updates with minimal wear.

A: Thanks to its 8‑Mbit capacity, high‑speed SPI interface, low power consumption, and industrial temperature range, the AT25DF081A-SH-T is well‑suited for a broad range of applications, including: Firmware storage – Boot code, BIOS, and application code in embedded systems. Data logging – Storing sensor data, events, and system logs. Configuration storage – Device settings, calibration constants, and user preferences. Consumer electronics – Smart appliances, wearables, set‑top boxes. Industrial control – PLCs, HMIs, motor drives. Medical devices – Portable diagnostic equipment, patient monitors. ⚠️ Important Lifecycle Information: The AT25DF081A-SH-T is Active and in production. Renesas (through the Adesto acquisition) continues to manufacture this device. Multiple major distributors (Mouser, DigiKey, Farnell) list the part as Active with standard lead times. However, the AT25DF081A family is an older generation (originally from Adesto). For new designs, Renesas recommends considering the AT25SF081B series (with higher performance and lower power) as a drop‑in replacement, but the AT25DF081A-SH-T remains a reliable choice for legacy designs or projects requiring this exact specification. Engineers should verify current availability with authorised distributors.