Winbond Electronics Corporation W25Q64DWSSIG

Overview

W25Q64DWSSIG from Winbond is a 1.8V, 64M-bit (8MB) serial NOR flash memory IC supporting Standard/Dual/Quad SPI and QPI interfaces. It delivers up to 104MHz SPI clock rate, 416MHz equivalent Quad I/O throughput, and true execute-in-place (XIP) capability for code storage and execution in space-constrained embedded systems.

For engineers reviewing the W25Q64DWSSIG datasheet, W25Q64DWSSIG pinout, W25Q64DWSSIG application, or W25Q64DWSSIG equivalent, key selection criteria include its 1.7–1.95V supply range, 4KB uniform sector architecture, hardware write protection via /WP and /HOLD pins, and JEDEC-compliant identification support.

Technical Context

The W25Q64DWSSIG implements a flexible SPI command set with dedicated instructions for Fast Read Dual/Quad I/O (3Bh/6Bh/BBh/EBh), Quad Input Page Program (32h), and QPI mode entry (38h). Its status register includes non-volatile Quad Enable (QE) bit enabling IO2/IO3 functionality and volatile Block Protect bits for granular 4KB–64KB memory locking.

It supports three erase granularities - 4KB sectors (2,048 total), 32KB blocks (1,024), and 64KB blocks (128) - with program/erase suspend/resume capability and >100,000 endurance cycles. The device uses internal high-voltage generators for erase/program operations without external VPP.

Key Specifications

Pinout & Package

W25Q64DWSSIG is packaged in an 8-pin SOIC 208-mil (package code SS), with pin 1 marked by a dot or beveled corner. Pin functions are identical across SOIC and WSON variants per datasheet Figures 1a and 1b.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MX25L6433FZNI-10G and S25FL164K0XMFI010, the W25Q64DWSSIG offers superior 1.8V efficiency, QPI acceleration, and integrated security features - making it optimal for power-constrained, XIP-capable, and secure-boot designs where 104MHz Quad SPI throughput and 4KB sector flexibility are critical.

Availability

W25Q64DWSSIG is available at Aetrix Electronics and suitable for industrial PLCs, automotive infotainment systems, medical diagnostics, IoT edge gateways, and consumer electronics requiring stable component supply, long-term lifecycle support, and consistent parametric performance.

Supply support for W25Q64DWSSIG 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 DRAM, mobile DRAM, and serial flash memory solutions for embedded, communications, and consumer markets.

The W25Q series was designed specifically for high-performance, low-voltage embedded code storage - emphasizing XIP capability, multi-I/O interface flexibility, and robust security features for next-generation firmware architectures.

FAQ

What voltage range does the W25Q64DWSSIG operate within, and is level shifting required for 3.3V microcontrollers?

The W25Q64DWSSIG operates strictly within 1.7 V to 1.95 V. It is not 3.3V-tolerant, so direct interfacing with 3.3V microcontrollers requires bidirectional level shifters on all signal lines (/CS, CLK, IO0–IO3). Failure to implement level translation risks permanent damage to the W25Q64DWSSIG due to overvoltage on its I/O pins.

Does the W25Q64DWSSIG support true execute-in-place (XIP), and what interface mode delivers optimal performance?

Yes, the W25Q64DWSSIG supports true XIP via Continuous Read Mode and Quad SPI or QPI interfaces. For maximum throughput, QPI mode (enabled via 38h instruction and QE bit) delivers the lowest instruction overhead - requiring only two clocks to fetch any instruction versus eight in Standard SPI - making it ideal for real-time XIP in Cortex-M7/A-class applications.

How is hardware write protection implemented on the W25Q64DWSSIG, and can it protect individual sectors?

Hardware write protection on the W25Q64DWSSIG uses the /WP pin in conjunction with status register bits (BP2–BP0, TB, SEC). When /WP is held low and BP bits are set, it locks specific 4KB sectors or larger blocks. The TB bit determines whether protection applies to top or bottom memory regions - enabling independent locking of bootloader (top) and application (bottom) sectors.

What is the function of the /HOLD pin on the W25Q64DWSSIG, and is it usable in Quad SPI mode?

The /HOLD pin on the W25Q64DWSSIG pauses ongoing SPI transfers while /CS remains asserted, allowing shared bus arbitration. However, in Quad SPI or QPI mode - when the Quad Enable (QE) bit is set - the /HOLD pin is reassigned as IO3 and cannot be used for hold functionality. Hold is only available in Standard and Dual SPI modes.

Can the W25Q64DWSSIG be used in systems requiring traceable device identity, and how is the unique ID accessed?

Yes, each W25Q64DWSSIG contains a factory-programmed, unchangeable 64-bit unique ID. It is read using the Read Unique ID Number instruction (4Bh) with a 4-byte address prefix, returning 8 bytes of serial data. This enables deterministic device identification for firmware signing, cloud provisioning, and anti-counterfeiting in production and field-deployed systems.