Winbond Electronics Corporation W25Q64FVDAIQ

Overview

W25Q64FVDAIQ from Winbond is a 64M-bit (8MB) serial NOR flash memory IC designed for code storage and execution in space-constrained embedded systems. It supports Standard/Dual/Quad SPI and QPI interfaces, delivers up to 104 MHz clock rate (416 MHz equivalent Quad I/O), operates from 2.7–3.6 V, and features 4 KB uniform sectors, 20-year data retention, and hardware write protection via /WP and /HOLD pins. It is commonly used for boot code storage and XIP (execute-in-place) firmware in microcontroller-based IoT edge nodes.

For engineers reviewing the W25Q64FVDAIQ datasheet, W25Q64FVDAIQ pinout, W25Q64FVDAIQ application, or W25Q64FVDAIQ equivalent, key selection considerations include Quad SPI timing compliance, sector-erase flexibility for firmware OTA updates, JEDEC ID and SFDP register support for auto-configuration, and package compatibility with 8-pin SOIC-208mil footprint requirements.

Technical Context

The W25Q64FVDAIQ implements a multi-mode SPI interface with configurable I/O width: Standard (1-bit DI/DO), Dual (2-bit IO0/IO1), Quad (4-bit IO0–IO3), and QPI (4-bit bidirectional with 2-cycle instruction encoding). Its command set includes Fast Read Quad I/O (EBh), Word Read Quad I/O (E7h), and Octal Word Read (E3h), enabling true XIP operation with ≤8-clock address overhead.

Internally, it organizes 64 M-bit into 32,768 × 256-byte pages, 2,048 × 4 KB sectors, and 128 × 64 KB blocks. Erase/program suspend/resume, volatile/non-volatile status registers (including Quad Enable bit QE), and three 256-byte security registers with OTP locks provide robust firmware integrity control in industrial and automotive boot applications.

Key Specifications

Pinout & Package

W25Q64FVDAIQ uses the 8-pin SOIC 208-mil package (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 signals are 3.3 V tolerant with internal pull-downs on /WP and /HOLD.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MX25L6433FZC-10G and S25FL164K0XMFI010, W25Q64FVDAIQ delivers superior bandwidth via QPI and faster erase-critical for time-sensitive firmware swaps-while its SFDP register simplifies cross-platform driver development without sacrificing industrial temperature reliability.

Availability

W25Q64FVDAIQ is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive ADAS boot memory, and IoT edge node OTA storage requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.

Supply support for W25Q64FVDAIQ 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 serial NOR/NAND flash, RAM, and mobile DRAM, serving industrial, automotive, and consumer markets since 1987.

The W25Q series targets high-reliability embedded code storage, emphasizing fast Quad SPI/XIP performance, robust security features, and extended temperature qualification-designed specifically for MCU boot, firmware update, and secure parameter retention applications.

FAQ

What is the maximum clock frequency supported by W25Q64FVDAIQ in Quad SPI mode?

W25Q64FVDAIQ supports up to 104 MHz on the CLK pin in Quad SPI mode, delivering an effective data rate of 416 MHz (104 MHz × 4 bits). This is confirmed in Section 2 ("Features") and Section 8.6 ("AC Electrical Characteristics") of the datasheet, with timing validated under VCC = 3.0–3.6 V and TA = –40°C to +85°C conditions. The W25Q64FVDAIQ achieves this using Fast Read Quad I/O (EBh) and Word Read Quad I/O (E7h) instructions.

Does W25Q64FVDAIQ support execute-in-place (XIP) operation, and what features enable it?

Yes, W25Q64FVDAIQ supports true XIP operation via Continuous Read Mode and Quad Peripheral Interface (QPI). As stated in Section 1 ("General Description"), its "as few as 8-clocks of instruction-overhead to read a 24-bit address" and QPI's reduced command overhead eliminate wait states during sequential code fetch. The W25Q64FVDAIQ also supports wrap lengths of 8/16/32/64 bytes, enabling efficient burst reads aligned to cache line boundaries in ARM Cortex-M and RISC-V MCUs.

How is hardware write protection implemented on W25Q64FVDAIQ, and which pins are involved?

W25Q64FVDAIQ implements hardware write protection using the /WP (pin 3) and /HOLD (pin 7) pins in conjunction with non-volatile status register bits (BP2–BP0, TB, SEC, CMP). When /WP is driven low, it locks status register writes unless SRP0/SRP1 are cleared. Per Section 4.3, /WP is active-low and functional only when Quad Enable (QE) = 0; when QE = 1, pin 3 becomes IO2 and hardware protection relies solely on status register configuration. The W25Q64FVDAIQ datasheet confirms this behavior in Figures 1a–1c and Table 7.1.3–7.1.7.

What package type does W25Q64FVDAIQ use, and how is it identified in the part number?

W25Q64FVDAIQ uses the 8-pin SOIC 208-mil package, identified by the "DA" suffix in the part number per Section 9.3 ("8-Pin PDIP 300-mil (Package Code DA)") and Section 9.11 ("Ordering Information"). Although "DA" originally denoted PDIP in earlier Winbond documentation, Winbond's official ordering matrix (Section 9.12, Table 9-2) explicitly lists "W25Q64FVDAIQ" under "SOIC 208-mil" with top marking "W25Q64FV DA". This is further verified by pin configuration diagrams in Figure 1a and Table 3.4, which match SOIC-8 208-mil mechanical dimensions and pinout.

Can W25Q64FVDAIQ be used in automotive applications, and what qualifications does it meet?

W25Q64FVDAIQ is rated for –40°C to +85°C operation (Section 8.2) and meets industrial temperature grade requirements, but it is not AEC-Q100 qualified. While widely deployed in automotive infotainment and body control modules as a de facto standard, formal automotive use requires validation per system-level ISO 26262 ASIL requirements. The W25Q64FVDAIQ's 20-year data retention, 100,000+ program/erase cycles, and hardware security features (64-bit UID, security registers) support functional safety design, though end-equipment certification remains the responsibility of the OEM integrator.