S25FL256SAGMFVR03

S25FL256SAGMFVR03 is a 256-Mbit Serial NOR Flash memory (SPI family) from Spansion/Cypress (now Microchip). It stores firmware and data and is used to boot and run embedded systems.
Key points:
- Capacity and interface: 256 Mbit of serial flash with SPI; supports 4-byte addressing for large memories and optional Dual/Quad I/O (QPI) for higher throughput.
- Voltage and temperature: typically 2.7–3.6 V operation; industrial temperature variants available (exact temp range depends on package/variant).
- Memory organization: uses pages (often 256 B), sectors (4 KB), and blocks (32 KB/64 KB) with erase/program operations.
- Commands and features: standard Read/Fast Read, Page Program (256 bytes), Sector/Block/Chip Erase, Write Enable Latch, Read/Write Status, and Deep Power-Down. Includes block protection and security features.
- Performance: high-speed reads (via SPI/QPI modes), fast page programming, and sleep/deep power-down for low power.
- Applications: firmware storage, bootloaders, configuration data, and other code/data storage in embedded systems.
- Variant note: VR03 refers to a specific revision/package/version in the S25FL256SAGMF family; check the latest datasheet for exact electrical, timing, and packaging details.

Key features of S25FL256SAGMFVR03:
- 256-Mbit serial flash memory (32 MBytes) with 24-bit addressing
- SPI interface with optional Dual/Quad I/O (DQ0–DQ3) for high-speed reads
- Page program: 256 bytes; erase sectors 4 KB; blocks (64 KB); chip erase supported
- Fast read modes: standard, fast, and dual/quad read; supports continuous read
- Low-power modes: deep power-down and standby
- Write protection: hardware/software protection (BP bits, WP#)
- Endurance and retention: typical P/E cycles around industry standard; data retention ~20 years
- Operating voltage: 2.7V–3.6V
- Temperature range: typically -40°C to 85°C (industrial)
- Package: 8-pin serial NOR flash package (SPI)
Note: exact timings and endurance can vary by revision; refer to the official datasheet for latest specs.

The S25FL256SAGMFVR03 uses an 8-pin SOP (SOIC) package.

- Pin count: 8 pins (8-pin package).
- Function: 256-Mbit Serial NOR Flash memory with SPI-compatible interface (used for code/data storage). Pins provide: CS#, SCK, SI (MOSI), SO (MISO), WP#, HOLD#, VCC, GND. It supports standard SPI and, in some variants, Quad I/O SPI modes.

Manufacturer: Spansion Inc. (a semiconductor company that designs and markets flash memory). Spansion originated as a joint venture between AMD and Fujitsu and was later acquired by Cypress Semiconductor, which is now part of Infineon Technologies. The company specializes in flash memory products (e.g., Serial NOR flash).

High-density SPI serial NOR flash for embedded systems. Typical uses: boot memory and firmware storage for microcontrollers/SoCs (XIP/fast boot); firmware, data, config storage and OTA updates; secure key storage. Suitable for consumer electronics (set-top boxes, printers), networking gear (routers, gateways), automotive ECUs, and industrial control systems requiring reliable long-retention non-volatile memory.

Equivalent SPI-NOR Flash (256 Mb) to S25FL256SAGMFVR03 (8-pin, 2.7–3.6 V):
- Winbond W25Q256FV / W25Q256JV
- Macronix MX25L25645G / MX25L25635FMI-10G
- Micron N25Q256A13ESE
- Gigadevice GD25Q256C / GD25Q256D
- ISSI IS25LP256D
- Puya P25Q256H
- Fudan Micro FM25L256
Note: verify exact package, voltage, and timing per datasheet for cross-compatibility.