AT25FF321A-SSHN-T

AT25FF321A-SSHN-T is a 32‑Mbit Serial Flash memory from Atmel/Microchip. It provides reprogrammable storage for code and data via a serial SPI interface.
Key points:
- Interface: SPI (CS, CLK, SI, SO). Commands typical of SPI Flash: Read 0x03, Fast Read 0x0B, Page Program 0x02, Sector Erase 0x20, Block Erase 0xD8, Chip Erase 0xC7, Write Enable 0x06, Read Status 0x05. A Write Enable is required before program/erase; WIP bit in the status register indicates busy.
- Density/organization: 32 Mbit (4 MB) of flash; organized as 4,194,304 bytes, 256-byte pages; 4 KB sectors; 32 KB/64 KB blocks.
- Performance: High-speed SPI up to ~80–104 MHz; supports deep power-down and low-power modes.
- Supply/temperature: Vcc typically 2.7–3.6 V; temperature range per datasheet (commercial/industrial variants).
- Package: 8-pin surface-mount; -SSHN-T denotes the package code; -T typically indicates tape-and-reel.
Applications: firmware storage, bootloaders, data logging. For exact specs and timing, consult the datasheet.

Equivalents for AT25FF321A-SSHN-T (32 Mbit SPI flash, 8-pin):
- Winbond W25Q32FVSSIG / W25Q32FVSIG
- Macronix MX25L3206EMI-12G
- Gigadevice GD25Q32CSIG / GD25Q32C
- ISSI IS25LP032D
- Puya P25Q32H
Note: verify voltage (2.7–3.6 V), package, and mode support (SPI, Dual/Quad) since features vary.

AT25FF321A-SSHN-T is a 32-Mbit serial flash memory with SPI interface. Key features:
- Density: 32 Mbit (4 MBytes) of flash
- Interface: SPI (4-wire) with standard read/fast read
- Supply: 2.7–3.6 V, single-supply operation
- Page size: 256 bytes; supports page program
- Erase blocks: 4 KB sectors; 32 KB and 64 KB blocks; full array erase
- Addressing: 24-bit addressing for full memory map
- Speed: Fast read up to around 80–104 MHz clock
- Power management: Deep power-down mode
- Protection: Hardware write protection and sector/block protection
- Endurance/retention:~100k P/E cycles per sector; data retention >20 years
- Temperature: Industrial range (-40°C to +85°C)
- Package: 8-pin SSHN-T (compact SPI serial flash form factor)
Optional note: verify exact timing/erase sizes in the latest datasheet for your specific revision.

Pin count: 8.
Functions (SPI serial flash interface):
- VCC: Power supply
- GND: Ground
- CS (Chip Select, active low)
- SCK (Serial Clock)
- SI (Serial Input / MOSI)
- SO (Serial Output / MISO)
- WP# (Write Protect, active-low)
- HOLD# (Hold, active-low)
Note: AT25FF321A is a 32-Mbit SPI Serial Flash; the last two pins are commonly labeled WP# and HOLD# in this package.

- Manufacturer: Atmel Corporation, now part of Microchip Technology Inc.
- What kind of company: A global semiconductor company that designs and manufactures embedded solutions, including microcontrollers and memory devices (such as serial flash).

AT25FF321A-SSHN-T is a 32-Mbit SPI serial flash. Suitable applications include:
- Primary firmware/boot code storage for microcontrollers and SoCs
- Firmware updates and upgrade storage
- FPGA/CPLD configuration bitstreams
- Nonvolatile data storage for data logging, LUTs, fonts, and static data
- General nonvolatile storage in consumer electronics, automotive, and industrial equipment requiring compact, low‑pin SPI flash.

It’s an 8‑pin Small Outline package: SOIC‑8, Narrow (8‑lead) in Tape‑&‑Reel packaging.