W25Q128FVSAQ

Winbond W25Q128FVSAQ is a 128‑Mbit serial flash memory used to store firmware and data in embedded systems. It provides an SPI interface with Single/Dual/Quad I/O (Quad SPI for higher throughput). Supply voltage is typically 2.7–3.6 V (3.3 V nominal). It supports standard SPI clocks up to 104 MHz and features memory-mapped/continuous read modes for easy MCU integration.
Memory organization: 256‑byte pages; erase units include 4 KB sectors, 32 KB and 64 KB blocks, and a full-chip erase. Key capabilities include fast read, power-down and deep power-down modes, write enable/disable, and sector/block protection via status registers. It also includes an OTP area and security features for data protection.
Typical uses: boot flash for microcontrollers/SoCs, firmware updates, and embedded data storage. Packaging options include small 8‑pin packages (e.g., SOIC/SOP) with variants denoted by suffixes like SAQ.

Equivalent 128-Mbit SPI NOR Flash (same family and interfaces; check voltage and timing):
- Macronix MX25L12845G (MX25L12845GMI-10G)
- Gigadevice GD25Q128B / GD25Q128C
- Micron N25Q128A13 (N25Q128A13ESE)
- Spansion/Cypress S25FL128S
- Puya P25Q128H
- SST25SF128A (SST/Microchip)
Note: voltage (2.7–3.6V) and JEDEC/pinout vary by part; verify datasheet for full compatibility.

Concise features of W25Q128FVSAQ (Winbond 128-Mbit serial flash):
- 128 Mbit (16 MB) flash memory
- 2.7–3.6 V operation (3.3 V nominal)
- 8-pin package (SOP8)
- SPI-compatible interface with Quad I/O support (Dual/Quad SPI modes)
- 3-byte addressing (up to 16 MB); optional 4-byte address mode for larger memories
- Page size 256 bytes; erase: 4 KB sectors, 64 KB blocks, chip erase
- High-speed read modes (up to ~104 MHz SPI); Quad/dual I/O for higher throughput
- Deep power-down mode and power-saving features
- Write protection (BP bits) and standard security features
- Endurance: typically 100,000 program/erase cycles; data retention ~20 years
- Temperature range: -40 to 85°C (industrial variant)
Note: exact package options and some voltage/speed specs may vary by specific part variant; verify the datasheet for your exact device marking.

- Pin count: 8 pins (8-pin package such as SOIC/SOP)
- Function: 128-Mbit serial flash memory with SPI interface
- CS (Chip Select)
- CLK (Serial Clock)
- DI (Data In / MOSI)
- DO (Data Out / MISO)
- VCC
- GND
- WP# (Write Protect, active-low)
- HOLD# (Hold, active-low)

- Manufacturer: Winbond Electronics Corp.
- What kind of company: A Taiwan-based semiconductor company that designs and manufactures memory chips (notably non-volatile NOR flash and DRAM) for global automotive, consumer, and industrial markets.

W25Q128FVSAQ is a 128‑Mbit serial flash memory used for non-volatile code/data storage in many devices. Typical applications include:
- Firmware/bootloader storage for MCUs/SoCs and BIOS/UEFI on development boards
- Execute-In-Place (XIP) storage for embedded software
- Data logging, configuration data, LUTs, and calibration data in consumer electronics, industrial equipment, and networking gear
- Firmware update media for routers, set‑top boxes, cameras, wearables, and automotive ECUs

An 8-pin SOP (SOIC) package.