Winbond Electronics Corporation W25Q256FVCJQ

Overview

W25Q256FVCJQ from Winbond is a 256M-bit (32MB) serial NOR flash memory IC supporting Standard/Dual/Quad SPI and QPI interfaces, operating at up to 104 MHz clock rate with 4KB uniform sector erase, 2.7–3.6V single supply, and -40°C to +85°C temperature range. It enables execute-in-place (XIP) code execution in embedded microcontrollers and stores firmware, configuration data, and boot images.

For engineers reviewing the W25Q256FVCJQ datasheet, W25Q256FVCJQ pinout, W25Q256FVCJQ application, or W25Q256FVCJQ equivalent, key selection considerations include 4-byte addressing support, Quad Enable (QE) bit configuration, /HOLD or /RESET dual-function pin behavior, and JEDEC SFDP register compatibility for automated initialization.

Technical Context

The W25Q256FVCJQ implements a flexible SPI-compatible command set with hardware- and software-controlled write protection, including volatile/non-volatile status register bits (BP0–BP3, TB, CMP, SRP0/SRP1), programmable output driver strength (DRV0/DRV1), and HOLD/RST function selection via status register. Its architecture supports both 3-byte and 4-byte address modes, with dedicated instructions to enter/exit 4-byte mode (B7h/E9h).

It integrates three 256-byte security registers with OTP lock capability, a 64-bit unique ID, and JEDEC-standard SFDP (Serial Flash Discoverable Parameters) register for runtime configuration discovery. Erase/program suspend/resume functionality enables concurrent background operations without interrupting host communication.

Key Specifications

Pinout & Package

W25Q256FVCJQ is packaged in an 8-pad WSON 8×6 mm (Package Code E), with exposed pad for thermal dissipation and space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MX25L25673FMI-10G, W25Q256FVCJQ delivers QPI acceleration and 4-byte addressing for scalable firmware architectures; versus S25FL256SAGMFIR10, it trades built-in ECC for broader instruction set compatibility and simpler register programming - making it ideal for resource-constrained MCUs without ECC-aware drivers.

Availability

W25Q256FVCJQ is available at Aetrix Electronics and suitable for industrial automation, automotive telematics, medical diagnostics, and networking infrastructure requiring stable component supply and long-term obsolescence management.

Supply support for W25Q256FVCJQ 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 SPI NOR/NAND flash, RAM, and mobile DRAM - serving industrial, automotive, and consumer markets since 1987.

The W25Q series targets high-performance embedded systems needing reliable, pin-efficient code storage with advanced features like XIP, security registers, and multi-mode SPI - designed specifically for MCU-boot and firmware update use cases.

FAQ

What is the package type and footprint of W25Q256FVCJQ?

W25Q256FVCJQ uses an 8-pad WSON 8×6 mm package (Package Code E) with exposed thermal pad. Its footprint matches JEDEC MS-012AC standards and requires no lead-free reflow profile deviation. The pinout is fixed: /CS, DO(IO1), /WP(IO2), GND, DI(IO0), CLK, /HOLD or /RESET(IO3), VCC - verified in Winbond's Preliminary Revision I datasheet Figure 1a.

Does W25Q256FVCJQ support 4-byte addressing, and how is it enabled?

Yes, W25Q256FVCJQ supports 4-byte addressing for accessing its full 32 MB capacity. It is enabled via the Enter 4-Byte Address Mode instruction (B7h), which sets the ADP bit in Status Register-3. The setting persists after power cycle if ADP is written as non-volatile. Exit is performed using E9h. This is mandatory for addressing beyond 16 MB in standard SPI mode.

How does the /HOLD pin behave when Quad SPI mode is active on W25Q256FVCJQ?

When the Quad Enable (QE) bit in Status Register-2 is set to 1, the /HOLD pin on W25Q256FVCJQ is repurposed as IO3 for Quad SPI communication and cannot function as a hold signal. The HOLD/RST function is disabled in this mode - confirmed in Section 3.2 and 4.4 of the datasheet. To retain hold functionality, QE must remain cleared (0).

What is the role of the QE bit in W25Q256FVCJQ, and where is it located?

The QE (Quad Enable) bit is bit 1 of Status Register-2 (SR2) in W25Q256FVCJQ and controls whether IO2 (/WP) and IO3 (/HOLD or /RESET) are enabled for Quad SPI operation. When QE=1, those pins become bidirectional I/O lines; when QE=0, they retain their standard SPI functions. Writing QE requires Write Enable (06h) followed by Write Status Register-2 (31h).

Can W25Q256FVCJQ be used for execute-in-place (XIP) applications, and what conditions apply?

Yes, W25Q256FVCJQ supports true XIP via Continuous Read Mode with as few as 8 clocks of instruction overhead per address access. For reliable XIP, the host controller must support Quad SPI or QPI, the QE bit must be set, and the memory map must be configured for 4-byte addressing if accessing >16 MB. Verified timing parameters for Fast Read Quad I/O (6Bh/6Ch) ensure deterministic latency.