AT25DF041A-MHF-T

AT25DF041A-MHF-T is a 4‑Mbit Serial DataFlash memory from Atmel/Microchip. It provides non‑volatile storage for firmware and data in embedded systems and is accessed over a Serial Peripheral Interface (SPI).
Key points:
- Density and organization: 4 Mbit (512 KB usable), accessed with 3‑byte (A23–A0) addressing.
- Interface: SPI slave, supports standard and fast read; modes 0/3.
- Speed and voltage: operates 2.7–3.6 V; SPI clock up to high speeds (typical fast read up to tens of MHz—refer to datasheet for exact value).
- Memory organization: 256‑byte pages; erase in 4 KB sectors and larger blocks; supports page program and read/erase operations.
- Features: low‑power modes and power‑down; reliable non‑volatile storage with good data retention.
- Packaging: MHF‑T denotes an 8‑pin package variant (small form factor, suitable for compact boards).
Typical uses: firmware/code storage, configuration data, data logging, bootloaders, and other embedded applications requiring a simple SPI flash.
For precise electrical specs, timing, and command set details, consult the AT25DF041A-MHF-T datasheet.

AT25DF041A-MHF-T features (concise):
- 4 Mbit serial DataFlash memory
- SPI-compatible serial interface: CS, SCK, SI, SO (supports CPOL/CPHA)
- 256-byte page size; page-program operation
- Read modes: fast/continuous read; supports in-system/execute-in-place
- Erase capability: sector/block erases (typical DataFlash architecture)
- Power/power-down: 2.7–3.6 V operation; deep power-down and standby modes
- Endurance and retention: ~100k P/E cycles; data retention ~20+ years
- Security features: hardware write protection and HOLD pin
- Temperature: industrial range (typical -40°C to +85°C)
- Packaging: 8-pin MHF-T (Tape & Reel version available)
- Applications: firmware/data storage for microcontrollers and embedded systems
Note: specific sector/block sizes and exact timing/clock specs vary by revision; consult the datasheet for detailed numbers.

Package type: 8-pin SOIC (small-outline) surface-mount package; Tape‑and‑Reel shipping (-T).

Pin count: 8 pins (MHF-T package) for the AT25DF041A-MHF-T.
Pin functions:
- 1: CS# (Chip Select)
- 2: DO (MISO)
- 3: WP# (Write Protect)
- 4: GND (VSS)
- 5: DI (MOSI)
- 6: CLK (SCK)
- 7: HOLD# (Hold)
- 8: VCC (Power)
The device is a serial SPI flash memory (4 Mbit). All timing/control pins (CS#, SCK, MOSI, MISO) are used for SPI access, with WP# and HOLD# as optional control features.

- Manufacturer: Microchip Technology Inc. (the AT25DF041A family was originally Atmel and is now part of Microchip after the Atmel acquisition).
- What kind of company: A multinational semiconductor company that designs, develops, and manufactures microcontrollers, non-volatile memory, and other analog/mixed-signal ICs for embedded systems.

- Embedded systems: non-volatile code and data storage
- Firmware/boot memory for microcontrollers
- Firmware update storage in consumer electronics and IoT
- Data logging/storage for automotive, industrial, medical devices
- Display assets (fonts, icons, LUTs, images) storage
- Small-form-factor storage for networking gear and portable devices

Equivalents (4 Mbit SPI NOR, 2.7–3.6V, 8-SOP equivalents):
- Winbond W25Q40BV / W25Q40
- GigaDevice GD25Q40B
- Macronix MX25L4006 / MX25L4006E
- ISSI IS25LP040A
- Spansion S25FL040 / S25FL040A
Note: exact package/revision may vary; verify timing and voltage specs per device.