S25FL256SAGMFVR03

S25FL256SAGMFVR03 is a 256‑Mbit serial NOR flash memory from Spansion/Cypress (S25FL256S family). It provides nonvolatile storage for firmware and data in embedded systems and is SPI‑based.
Key points:
- Interface: SPI with standard SPI, plus dual I/O and quad I/O (QPI) read modes for higher throughput.
- Density and organization: 256 Mbit, 256‑byte pages; sectors sized 4 KB, 32 KB, and 64 KB for erase.
- Voltage: typically operates from 2.7–3.6 V (check datasheet for exact range and variants).
- Features: fast read options, deep power‑down, resume from power‑down, and block/region protection for secure firmware storage.
- Packaging: available in small footprints (e.g., 8‑pin packages such as SOIC/WSON variants).
- Applications: firmware boot code storage, firmware updates, and general nonvolatile data storage in MCUs/SoCs.
The “R03” suffix denotes revision 3 of this variant. For exact electrical specs, timings, and packaging, consult the datasheet.

Equivalent products (256-Mbit SPI NOR Flash) from other vendors:
- Winbond: W25Q256JV (and W25Q256DV)
- Macronix: MX25L25635F (and MX25L25645G)
- GigaDevice: GD25Q256C (and GD25Q256D)
- ISSI: IS25LP256D (and IS25LP256Q)
Note: verify exact voltage, speed, and package for a precise cross-reference.

Key features of S25FL256SAGMFVR03:
- 256-Mbit Serial NOR flash memory
- SPI interface with Dual/Quad I/O and QPI modes; fast reads up to ~133 MHz
- 4‑byte addressing mode for addressing beyond 16 MB
- 256-byte page program; typical write buffer for pages
- Erase granularity: 4 KB sectors; 32 KB and 64 KB blocks
- Erase and program suspend/resume support
- Deep power-down mode and low-power standby
- Hardware protection: sector/block protection, security features, and read/write protection
- Data retention ≈ 20 years; endurance ≈ 100k program/erase cycles per sector
- Operating voltage: 2.7–3.6 V (I/O and core at Vcc)
- Operating temp range: −40 to +85 °C (industrial); various package options (e.g., 8‑pin SOIC)
Notes: exact voltage range and block sizes can vary by packaging/revision; this device supports standard NOR-Flash features for code storage and execution.

Pin count: 8 pins.
Function: 256-Mbit serial SPI flash memory (S25FL256S family) with standard SPI interface and extra control pins. Typical pinout:
- Pin 1 CS# (chip select)
- Pin 2 DO / MISO
- Pin 3 WP# (write protect)
- Pin 4 VSS (ground)
- Pin 5 DI / MOSI
- Pin 6 CLK (SCK)
- Pin 7 VCC (power)
- Pin 8 HOLD# (hold)
Uses four-wire SPI plus WP# and HOLD# for protection and pause functions.

- Manufacturer: Cypress Semiconductor Corporation (originating from Spansion; Cypress is now part of Infineon Technologies).
- What kind of company: A multinational semiconductor company that designs and manufactures integrated circuits, including memory products such as NOR flash.

- Firmware storage for MCUs/SoCs (boot code and application)
- Execute-In-Place (XIP) and boot memory replacement
- Firmware updates via SPI
- Data logging and storage in embedded, consumer, and industrial devices
- Automotive ECUs and infotainment systems
- Networking equipment (routers, switches, gateways)
- Consumer electronics (set‑top boxes, printers, cameras)
- IoT/edge devices requiring persistent storage
- Industrial control systems and PLCs

It comes in an 8‑pin small outline package (SO8/US8).