Winbond Electronics Corporation W25Q256FVEIG

Overview

W25Q256FVEIG from Winbond is a 256M-bit (32MB) serial NOR flash memory IC supporting Standard/Dual/Quad SPI and QPI interfaces, organized into 131,072 × 256-byte pages with 4KB uniform sector erase granularity, operating from 2.7V to 3.6V, and delivering up to 104MHz SPI clock rate for embedded code storage and XIP execution in space-constrained industrial controllers.

For engineers reviewing the W25Q256FVEIG datasheet, W25Q256FVEIG pinout, W25Q256FVEIG application, or W25Q256FVEIG equivalent, this device supports 4-byte addressing, JEDEC SFDP register, 64-bit unique ID, hardware write protection via /WP and /HOLD pins, and configurable Quad Enable (QE) bit for flexible interface mode selection in boot memory and firmware update systems.

Technical Context

The W25Q256FVEIG implements a dual-mode command architecture: Standard SPI uses dedicated DI/DO pins, while Quad SPI repurposes /WP and /HOLD as IO2/IO3 when QE=1 in Status Register-2. It supports both 3-byte and 4-byte address modes, with automatic 4-byte entry via B7h instruction and persistent power-up configuration via ADP bit.

Its block diagram integrates page buffer logic, column/row decode, high-voltage generators for erase/program, and three 256-byte security registers with OTP lock bits (LB3–LB1). Erase suspend/resume (75h/7Ah), continuous read with wrap (77h), and burst read (0Ch) enable deterministic real-time firmware access without full chip blocking.

Key Specifications

Pinout & Package

W25Q256FVEIG is packaged in an 8-pad WSON 8×6 mm (Package Code E), with exposed pad for thermal dissipation and footprint compatibility across Winbond's W25Q family.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial NOR flash memory applications.

Compared with MX25L25645GMI-10G, W25Q256FVEIG delivers higher throughput and scalable addressing; versus S25FL256SAGMFIR00, it trades integrated ECC for lower latency and broader ecosystem tooling support in standard SPI bootloaders.

Availability

W25Q256FVEIG is available at Aetrix Electronics and suitable for industrial control systems, automotive telematics modules, and medical diagnostic devices requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for W25Q256FVEIG includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Winbond Electronics is a Taiwan-based semiconductor manufacturer specializing in specialty memory solutions, including SPI NOR/NAND flash and SRAM, with over 30 years of foundry-independent design expertise.

The W25Q series was designed specifically for embedded code storage and execute-in-place (XIP) applications, balancing high-speed Quad I/O performance with robust data retention and hardware security features for industrial and automotive use cases.

FAQ

What is the package type and lead count for W25Q256FVEIG?

W25Q256FVEIG uses an 8-pad WSON (8×6 mm) package with exposed thermal pad (Package Code E). It has eight terminals: /CS, DO (IO1), /WP (IO2), GND, DI (IO0), CLK, /HOLD or /RESET (IO3), and VCC. This compact footprint supports high-density PCB layouts and thermal performance matching larger SOIC variants.

Does W25Q256FVEIG support 4-byte addressing, and how is it enabled?

Yes, W25Q256FVEIG supports 4-byte addressing via the Enter 4-Byte Address Mode instruction (B7h) and Exit instruction (E9h). The ADP bit in Status Register-1 determines power-up default mode: if ADP=1, device boots in 4-byte mode; if ADP=0, it defaults to 3-byte mode. This setting is non-volatile and persists across power cycles.

How does the Quad Enable (QE) bit affect pin functionality on W25Q256FVEIG?

The QE bit (bit 1 of Status Register-2) controls whether /WP and /HOLD pins function as hardware protection inputs or as IO2/IO3 in Quad SPI mode. When QE=0, /WP and /HOLD retain their standard protection roles; when QE=1, they become bidirectional data lines, disabling hardware write/halt functions unless explicitly reconfigured.

What is the purpose of the three 256-byte Security Registers in W25Q256FVEIG?

The three 256-byte Security Registers in W25Q256FVEIG provide OTP-lockable storage for cryptographic keys, device certificates, or calibration data. Once locked via LB1–LB3 bits, their contents survive all erase operations-including chip erase-and cannot be modified, ensuring hardware-enforced data immutability for secure boot and anti-counterfeiting.

Can W25Q256FVEIG be used for Execute-in-Place (XIP) applications, and what features enable this?

Yes, W25Q256FVEIG supports true XIP via its Continuous Read Mode and Quad Peripheral Interface (QPI). With as few as 8 clocks to initiate a read and 416 MB/s effective throughput in Quad I/O Fast Read mode, it delivers deterministic latency and bandwidth sufficient to replace parallel NOR flash in ARM Cortex-M and RISC-V boot sequences without external RAM buffering.