W25Q256JVFAQ

W25Q256JV is Winbond’s 256-Mbit serial flash memory (SPI) used to store firmware and data in embedded systems. The “JV” family supports standard SPI and Quad I/O (DQ0–DQ3) modes for faster reads.
Key points:
- Density: 256 Mbit (32 MB)
- Voltage: 2.7–3.6 V (typical 3.0–3.3 V)
- Temperature: -40 to 85 C (industrial)
- Interface: Standard SPI plus Dual/Quad I/O; supports fast/continuous read
- Memory organization: 256-byte pages; 4 KB sectors; 32 KB and 64 KB blocks
- Features: hardware write protection, status/ID registers, deep power-down, normal and fast read
- Package: 8-pin SOP or 8-pin WSON variants
Typical uses:
- Boot firmware storage for microcontrollers
- Code shadowing and data logging
- Replacing EEPROMs with higher capacity
Note: For exact command set, timings, erase/write durations, and electrical requirements, see the W25Q256JV datasheet and the official product FAQ on Winbond’s site.

Equivalent 256-Mbit SPI NOR flash parts include:
- Micron N25Q256A
- Macronix MX25L25645G (MX25L25633F variants also common)
- Gigadevice GD25Q256D
- Spansion/Cypress S25FL256S
- ISSI IS25LP256D
- Fudan Micro FM25Q256A
All are 256-Mbit SPI NOR flash devices with 3V operation; verify timing, voltage, and package when substituting.

Key features of W25Q256JVFAQ (256 Mbit serial flash):
- Capacity: 256 Mbit (32 MB) of flash memory.
- Voltage: 2.7–3.6 V (3.3 V nominal).
- Interfaces: SPI with standard, dual I/O and quad I/O modes; supports 4‑byte addressing for >16 MB.
- Organization: 256-byte page; 4 KB sectors; 32 KB / 64 KB blocks; chip erase option.
- Performance: Fast Read up to 104 MHz; higher throughput in Quad I/O mode.
- Power/reset: Deep Power-Down mode; Hold and Write Enable/Disable features.
- Security: BP protection bits, JEDEC ID, and 64‑bit Unique ID.
- Endurance/retention: Typical ~100k P/E cycles; data retention ~20 years (25°C).
- Temp & packaging: Industrial grade options available; operating range -40°C to 85°C; available in 8‑lead SOP or WSON packages.
用途: firmware storage, code shadowing, boot devices, and data logging.

- Pin count: 8 pins (SOIC/SOP-8 package)
- Function: W25Q256JVFAQ is a 256-Mbit serial SPI flash memory used for non-volatile storage of firmware/data. It provides standard SPI interface (CS, CLK, DI/MOSI, DO/MISO) plus WP# and HOLD# pins for write protection and hold, with VCC/GND power. It supports sector/page/block erase and fast read operations.

- Manufacturer: Winbond Electronics Corp.
- What kind of company: A Taiwanese semiconductor company that designs, manufactures, and markets memory products (notably NOR flash and DRAM) and provides global memory solutions.

W25Q256JVFAQ is a 256‑Mbit serial flash memory (non-volatile). Common applications:
- Firmware/boot code storage for microcontrollers
- Over‑the‑air (OTA) firmware updates
- Data logging and calibration/configuration data
- Small consumer electronics storage (set‑top boxes, cameras, wearables)
- Automotive and industrial control modules
- IoT edge devices and smart devices
- Networking equipment firmware and config storage
- Cache/buffer storage for SoCs and embedded controllers
These uses take advantage of its non-volatile, high-density storage in a compact SPI/Quad I/O interface.

The W25Q256JVFAQ is in an 8-pin SOP (SOIC-8) package.