Winbond Electronics Corporation W25Q256FVFIG

Overview

W25Q256FV from Winbond is a 256M-bit (32MB) serial NOR flash memory supporting Standard/Dual/Quad SPI and QPI interfaces, organized into 131,072 pages of 256 bytes each with uniform 4KB sector erase capability. It operates from 2.7V to 3.6V, draws 4mA active current and <1µA in power-down mode, and supports true execute-in-place (XIP) via Continuous Read Mode - ideal for code storage and firmware boot in space-constrained embedded systems.

For engineers reviewing the W25Q256FV datasheet, W25Q256FV pinout, W25Q256FV application, or W25Q256FV equivalent, key selection considerations include 104MHz SPI clock support, Quad I/O enable (QE bit), 4-byte addressing mode, hardware write protection via /WP and /HOLD pins, and JEDEC-compliant SFDP register access for automatic configuration.

Technical Context

The W25Q256FV implements a flexible SPI command architecture with three address modes (3-byte, 4-byte, and ADP-configurable power-up default), where Quad SPI operation requires non-volatile setting of the QE bit in Status Register-2. Its dual-mode /HOLD or /RESET pin on 8-pin packages is controlled by the HOLD/RST bit and QE state, enabling either pause functionality or hardware reset without external logic.

Internal memory organization supports granular protection: BP0–BP3, TB, CMP, and WPS bits allow selective locking of top/bottom sectors or individual 4KB blocks, while three 256-byte Security Registers provide OTP-lockable secure storage. Erase/program suspend/resume enables concurrent background operations during active read cycles.

Key Specifications

Pinout & Package

W25Q256FV is available in multiple industry-standard packages: 8-pad WSON 8×6 mm (E), 8-pin PDIP 300-mil (A), 16-pin SOIC 300-mil (F), and 24-ball TFBGA 8×6 mm (B/C). The 8-pin variants use shared IO functions (/WP as IO2, /HOLD as IO3) in Quad mode; SOIC-16 adds dedicated /RESET and NC pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MX25L25635F and S25FL256S, the W25Q256FV delivers optimal balance of QPI-enabled XIP performance, JEDEC-standard SFDP configurability, and ultra-low power-down current - making it ideal for cost-sensitive, space-constrained embedded systems requiring flexible firmware management.

Availability

W25Q256FV is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive infotainment boot code, and medical device calibration data requiring stable component supply across multi-year production cycles.

Supply support for W25Q256FV 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 company specializing in specialty memory solutions including NOR/NAND flash, SRAM, and mobile DRAM for industrial, automotive, and consumer markets.

The W25Q series targets high-performance embedded systems requiring reliable, low-power serial flash with advanced features like QPI, SFDP, and security registers - designed specifically for code execution and secure data storage in resource-limited platforms.

FAQ

What is the maximum SPI clock frequency supported by the W25Q256FV?

The W25Q256FV supports up to 104 MHz for Standard, Dual, and Quad SPI operations. When using Fast Read Dual I/O or Quad I/O instructions, this yields effective throughput of 208 MB/s or 416 MB/s respectively. These rates are specified under standard operating conditions (VCC = 3.0–3.6 V, TA = −40°C to +85°C) and require proper PCB layout for signal integrity. The W25Q256FV datasheet confirms these values in Section 9.6 AC Electrical Characteristics.

Does the W25Q256FV support 4-byte addressing mode, and how is it enabled?

Yes, the W25Q256FV supports both 3-byte and 4-byte addressing modes. The 4-byte mode is enabled via the Enter 4-Byte Address Mode instruction (B7h), and disabled using Exit 4-Byte Address Mode (E9h). The Power-Up Address Mode (ADP) bit in Status Register-3 determines whether the device powers up in 3-byte or 4-byte mode by default. This capability is essential for accessing the full 32 MB address space beyond the 16 MB limit of 3-byte addressing.

How does the Quad Enable (QE) bit affect pin functionality on the W25Q256FV?

The Quad Enable (QE) bit in Status Register-2 controls whether /WP and /HOLD pins function as hardware protection inputs or as IO2 and IO3 for Quad SPI. When QE = 0, /WP and /HOLD retain their standard protection roles; when QE = 1, those pins become bidirectional data lines. This reconfiguration is non-volatile and persists across power cycles. The W25Q256FV must be in Quad mode to use IO2/IO3, and QE must be set before issuing Quad instructions.

What package options are available for the W25Q256FV, and which include a dedicated /RESET pin?

The W25Q256FV is offered in 8-pad WSON 8×6 mm (E), 8-pin PDIP 300-mil (A), 16-pin SOIC 300-mil (F), and 24-ball TFBGA 8×6 mm (B/C). Only the 16-pin SOIC package (code F) provides a dedicated /RESET pin (Pin 3); all other packages implement reset functionality through the /HOLD pin when configured via the HOLD/RST bit and QE state. Pin descriptions for each variant are detailed in Sections 3.1–3.8 of the W25Q256FV datasheet.

Can the W25Q256FV be used for execute-in-place (XIP) applications, and what features enable this?

Yes, the W25Q256FV supports true execute-in-place operation via its Continuous Read Mode, which minimizes instruction overhead to as few as 8 clocks per 24-bit address. Combined with Quad I/O and QPI interfaces, this enables efficient sequential code fetch directly from flash without intermediate buffering. The W25Q256FV also supports wrap reads (8/16/32/64-byte) and fast read variants optimized for streaming - all confirmed in Section 6.2 and Figure 2 of the official datasheet.