Winbond Electronics Corporation W25Q64JVSSIM

Overview

W25Q64JVSSIM from Winbond is a 64M-bit (8MB) serial NOR flash memory IC supporting Standard, Dual, and Quad SPI interfaces. It operates from 2.7V to 3.6V, delivers up to 133MHz clock rate (532MHz equivalent in Quad I/O mode), features uniform 4KB sectors (2,048 total), and supports XIP (execute-in-place) for code storage in embedded microcontrollers. It is commonly used in IoT edge nodes for firmware storage and boot code execution.

For engineers reviewing the W25Q64JVSSIM datasheet, W25Q64JVSSIM pinout, W25Q64JVSSIM application, or W25Q64JVSSIM equivalent, key selection criteria include Quad SPI timing compliance, sector protection granularity, JEDEC ID verification, and SOIC-208-mil package compatibility with legacy PCB footprints.

Technical Context

The W25Q64JVSSIM implements a SPI-compatible command set with three operational modes: Standard (DI/DO), Dual (IO0/IO1), and Quad (IO0–IO3), where Quad mode requires non-volatile QE bit enablement in Status Register-2. Its architecture includes a 256-byte page buffer, SFDP register for discoverable parameters, and three 256-byte security registers.

It supports hardware write protection via /WP pin and volatile/non-volatile status register bits (BP2–BP0, TB, SEC, CMP), plus erase/program suspend/resume functionality. The /HOLD pin enables bus arbitration in multi-device SPI systems, while dedicated /RESET is absent in SOIC-208-mil (SS) package - only available in SOIC-16 and TFBGA variants.

Key Specifications

Pinout & Package

W25Q64JVSSIM uses the 8-pin SOIC 208-mil (Package Code SS) with exposed pad not present. Pin functions are electrically identical across all 8-pin variants (SOIC/WSON/XSON), but /RESET is not implemented in this package.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MX25L6433FZNI-10G and S25FL164K0XMFI010, W25Q64JVSSIM offers superior bandwidth via 133 MHz Quad SPI, built-in SFDP for plug-and-play initialization, and triple security registers - making it optimal for resource-constrained, OTA-capable embedded designs needing field-upgradable integrity.

Availability

W25Q64JVSSIM is available at Aetrix Electronics and suitable for industrial control, medical diagnostics, automotive camera modules, and smart home gateways requiring stable component supply and long-term obsolescence management.

Supply support for W25Q64JVSSIM 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 industrial, automotive, and consumer markets.

The W25Q series targets cost-sensitive, space-constrained embedded systems requiring high-speed code execution, secure firmware storage, and flexible erase architecture - especially where XIP, OTA updates, and cryptographic binding are critical.

FAQ

What is the package type and pin count of W25Q64JVSSIM?

W25Q64JVSSIM uses an 8-pin SOIC 208-mil package (Package Code SS). It has no dedicated /RESET pin - that function is only available on SOIC-16 and TFBGA variants. All 8 pins are electrically defined: /CS, DO(IO1), /WP(IO2), GND, DI(IO0), CLK, /HOLD(IO3), and VCC. This package is compatible with standard SOIC-8 footprints and supports full Dual/Quad SPI operation when the QE bit is enabled.

Does W25Q64JVSSIM support execute-in-place (XIP) operation?

Yes, W25Q64JVSSIM supports XIP via Dual and Quad SPI interfaces. Its 133 MHz clock rate and 532 MHz equivalent Quad I/O throughput enable low-latency instruction fetch directly from flash, eliminating need for full RAM shadowing. The device's uniform 4KB sector architecture and erase/program suspend/resume features further enhance real-time XIP reliability in interrupt-driven embedded applications using W25Q64JVSSIM.

How is hardware write protection implemented on W25Q64JVSSIM?

W25Q64JVSSIM implements hardware write protection using the /WP pin (Pin 3), which is active-low and protects status register writes when asserted. When combined with non-volatile block protect bits (BP2–BP0, TB, SEC), it enables hardware-enforced locking of sectors as small as 4KB or the entire array. Unlike software-only protection, /WP remains effective even during power glitches or firmware faults - a critical safeguard for boot code integrity in W25Q64JVSSIM deployments.

What is the purpose of the SFDP register in W25Q64JVSSIM?

The SFDP (Serial Flash Discoverable Parameters) register in W25Q64JVSSIM is a JEDEC-standardized, read-only memory map containing timing parameters, erase block sizes, voltage ranges, and feature flags. Host processors use it during initialization to auto-configure SPI clock dividers, wait states, and command sequences - eliminating hardcoded assumptions. This makes W25Q64JVSSIM interoperable across diverse SoCs and simplifies BSP development without requiring vendor-specific drivers.

Can W25Q64JVSSIM be used in automotive applications?

W25Q64JVSSIM is rated for –40°C to +85°C (industrial grade) and meets AEC-Q100 stress test requirements when qualified per Winbond's automotive-grade variants (e.g., W25Q64JVSFIQ). While W25Q64JVSSIM itself is not AEC-Q100 certified, its electrical specs, endurance (100K cycles), and data retention (>20 years) align with many ADAS camera module and body control unit use cases. For production automotive designs, confirm qualification status with Winbond and use W25Q64JVSFIQ or equivalent AEC-Q100 part numbers instead of W25Q64JVSSIM.