Winbond Electronics Corporation W25Q64FVSFIQ

Overview

W25Q64FVSFIQ from Winbond is a 64M-bit (8MB) serial NOR flash memory IC designed for code storage and data logging in space-constrained embedded systems. It supports Standard/Dual/Quad SPI and QPI interfaces, operates from 2.7V–3.6V, delivers up to 104MHz SPI clock rate (416MHz equivalent Quad I/O), and features 4KB uniform sectors, 20-year data retention, and hardware write protection via /WP and /HOLD pins. It is commonly used in microcontroller boot code storage and firmware update storage.

For engineers reviewing the W25Q64FVSFIQ datasheet, W25Q64FVSFIQ pinout, W25Q64FVSFIQ application, or W25Q64FVSFIQ equivalent, key selection considerations include Quad SPI XIP capability, JEDEC ID and SFDP register support, sector-level erase granularity, security register availability, and compatibility with 3.3V SPI controllers in industrial and consumer MCU platforms.

Technical Context

The W25Q64FVSFIQ implements a flexible SPI command architecture supporting four operational modes: Standard SPI (4-wire), Dual SPI (2 I/O lines), Quad SPI (4 I/O lines), and QPI (4-wire with 2-cycle instruction encoding). Its internal block diagram includes a 32,768-page × 256-byte array, page buffer, status register logic with volatile/non-volatile bits (including Quad Enable QE), and dedicated high-voltage generators for erase/program operations.

It integrates hardware-level protection mechanisms including software-controlled Block Protect (BP2–BP0), Top/Bottom (TB), Sector Protect (SEC), Complement Protect (CMP), and Status Register Protect (SRP0/SRP1), alongside physical /WP and /HOLD pins that function as IO2 and IO3 respectively when QE=1. The device also provides a 64-bit unique ID and three 256-byte security registers with OTP lock capability.

Key Specifications

Pinout & Package

W25Q64FVSFIQ is packaged in an 8-pin SOIC 208-mil (package code SS), with pin 1 = /CS, pin 2 = DO (IO1), pin 3 = /WP (IO2), pin 4 = GND, pin 5 = DI (IO0), pin 6 = CLK, pin 7 = /HOLD (IO3), pin 8 = VCC. All pins are electrically defined per Winbond datasheet Rev. S, and /WP and /HOLD revert to IO2/IO3 in Quad SPI mode when QE bit is set.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MX25L6433FZNI-10G and S25FL064L0XMFI010, W25Q64FVSFIQ uniquely balances high-speed Quad I/O, QPI efficiency, 4KB sector granularity, and integrated security features-making it optimal for resource-constrained, upgradable embedded systems requiring both performance and flexibility.

Availability

W25Q64FVSFIQ is available at Aetrix Electronics and suitable for MCU boot code storage, firmware OTA updates, and embedded GUI asset storage requiring stable component supply, long-lifecycle support, and consistent parametric compliance across production batches.

Supply support for W25Q64FVSFIQ 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 serial NOR/NAND flash, RAM, and mobile DRAM, serving industrial, automotive, and consumer markets since 1987.

The W25Q64FV series is part of Winbond's SpiFlash family, engineered for high-reliability code storage and data logging in embedded systems where small footprint, low power, and multi-interface flexibility are critical design constraints.

FAQ

What interface protocols does the W25Q64FVSFIQ support?

The W25Q64FVSFIQ supports Standard SPI (4-wire), Dual SPI (2 I/O), Quad SPI (4 I/O), and Quad Peripheral Interface (QPI) protocols. QPI mode reduces instruction overhead to two clock cycles and enables true execute-in-place (XIP) operation. All modes operate up to 104MHz clock frequency, with Quad SPI achieving up to 416MHz equivalent throughput. The W25Q64FVSFIQ requires the Quad Enable (QE) bit in Status Register-2 to be set to activate IO2 (/WP) and IO3 (/HOLD) for Quad operation.

Does the W25Q64FVSFIQ support hardware write protection?

Yes, the W25Q64FVSFIQ provides dual-layer hardware write protection: physical /WP pin (active-low) and configurable status register bits (BP2–BP0, TB, SEC, CMP, SRP0/SRP1). When /WP is held low, status register writes are blocked regardless of software settings. In Quad SPI mode (QE=1), the /WP pin functions as IO2 and hardware protection is disabled-relying solely on status register configuration. This behavior is documented in the Winbond W25Q64FV datasheet Section 4.3.

What is the sector and block organization of the W25Q64FVSFIQ?

The W25Q64FVSFIQ contains 2,048 uniform 4KB sectors and 128 uniform 64KB blocks. Each sector can be erased independently using the 20h instruction; 32KB and 64KB blocks use 52h and D8h instructions respectively. The memory array is organized into 32,768 pages of 256 bytes each, allowing 1–256 byte programming per page. This granular structure enables robust firmware partitioning, secure OTA updates, and efficient parameter storage without over-erasing unrelated regions.

How does the W25Q64FVSFIQ handle power-down and low-power operation?

The W25Q64FVSFIQ supports active current as low as 4mA at 104MHz and power-down current of <1µA (typical) using the B9h instruction. During power-down, all internal circuitry except wake-up logic is disabled; the device exits power-down upon /CS high-to-low transition. Power-up timing requires /CS to track VCC ramp and stabilize before first instruction. No external reset is needed-the W25Q64FVSFIQ initializes automatically on VCC rise, ready for command input after tVSL (100µs typical).

What security features are implemented in the W25Q64FVSFIQ?

The W25Q64FVSFIQ includes three 256-byte Security Registers with OTP lock bits, a 64-bit factory-programmed Unique ID, JEDEC-standard SFDP register for auto-configuration, and status register protection (SRP0/SRP1) to prevent accidental modification. Security Registers are accessible only via dedicated 42h/44h/48h instructions and can be permanently locked. The device also supports Erase/Program Suspend (75h/7Ah) to maintain data integrity during real-time interrupts-critical for secure boot and cryptographic key storage applications.