AT25DF041A-MHF-T

The AT25DF041A-MHF-T is a 4-Mbit Serial DataFlash memory from Microchip/Atmel with an SPI-compatible interface. It is designed for embedded systems to store firmware or data.
Key points:
- Density and interface: 4 Mbit of flash accessed via SPI (SCK, SO, SI, CS); also supports WP/HOLD pins for protection.
- Organization and operations: uses 256-byte pages and 4 KB sectors for erase; supports page-program and sector/block erase operations with straightforward read/write access.
- Power and packaging: operates from a single 2.7–3.6 V supply; available in an 8-pin package; -T denotes Tape-and-Reel packaging.
- Uses: firmware storage, bootloaders, data logging, and other embedded storage needs requiring a small, low-power serial flash.

Equivalent 4 Mbit SPI serial flash parts (voltage and package must match AT25DF041A-MHF-T):
- Winbond W25Q40BV/W25Q40BW
- Macronix MX25L4006/MX25L4006E
- GigaDevice GD25Q40B
- Spansion S25FL040 (S25FL040A)
- ISSI IS25LP040D/IS25LP040A
- SST SST25VF040B
Note: confirm 2.7–3.6 V operation and same package (e.g., 8-pin) for pinout compatibility.

Key features of AT25DF041A-MHF-T:
- 4-Mbit (512 KB) serial flash memory
- SPI-compatible serial interface (standard read and fast read)
- Operating voltage: 2.7–3.6 V
- 8-pin MHF‑T package (8-pin device)
- Page size: 256 bytes; page program supports up to 256 bytes
- Erase sets: 4 KB sectors; 64 KB blocks; bulk (chip) erase
- Write enable latch (WEL) and WIP status bit for polling
- Hardware write protection (WP#) and HOLD# pin for auxiliary control
- Deep Power-Down mode for low power consumption
- Data retention ~20 years; endurance ~100,000 erase cycles per sector
- Suitable for in-system programming and standard SPI timing
Notes:
- Designed for low-power, high-density storage in embedded systems.
- Temperature range typically available with the -T variant; refer to datasheet for exact grade.

- Pin count: 8 pins
- Function: AT25DF041A-MHF-T is a serial (SPI) DataFlash memory. Pin functions (typical 8-pin package):
- 1: CS (Chip Select, active low)
- 2: SO (Serial Output / MISO)
- 3: WP (Write Protect)
- 4: GND
- 5: SI (Serial Input / MOSI)
- 6: SCK (Serial Clock)
- 7: HOLD
- 8: VCC (Power)

- Manufacturer: Microchip Technology Inc. (Brand: Atmel; the AT25DF041A-MHF-T is part of Atmel’s DataFlash line, now owned and sold by Microchip).
- What kind of company: An American multinational semiconductor company that designs and manufactures integrated circuits, including microcontrollers, memory devices, and analog components.

AT25DF041A-MHF-T is a 4-Mbit SPI NOR flash. Common application areas:
- Firmware storage and boot memory for microcontrollers in embedded systems
- Execute-in-place (XIP) or code shadowing for MCUs
- Data storage, configuration data, and logs in industrial, consumer electronics, and IoT
- Firmware update/boot loader storage for OTA or field upgrades
- Small peripheral memory in printers, set‑top boxes, digital cameras, automotive modules, etc.

8-pin SOIC (surface-mount) package (150 mil width).