Winbond Electronics Corporation W25Q256JWBIM

Overview

W25Q256JWBIM from Winbond is a 1.8V, 256M-bit serial flash memory supporting Dual/Quad SPI, QPI, and DTR read modes with up to 133MHz Quad I/O clock frequency, 4KB uniform sector erase granularity, and integrated hardware write protection via /WP and /HOLD pins - deployed in embedded boot code storage, firmware update partitions, and secure parameter retention.

For engineers reviewing the W25Q256JWBIM datasheet, W25Q256JWBIM pinout, W25Q256JWBIM application, or W25Q256JWBIM equivalent, key selection considerations include 1.7–1.95V supply compatibility, 8-pin WSON 6×5-mm (Package Code P) footprint, 4-byte address mode support, JEDEC ID and SFDP register compliance, and quad I/O timing validation for XIP-capable microcontrollers.

Technical Context

The W25Q256JWBIM implements a flexible SPI-compatible interface with configurable operation modes: Standard SPI (DI/DO), Dual SPI (IO0/IO1), Quad SPI (IO0–IO3), and QPI with Double Transfer Rate (DTR) reads. Its architecture supports both 3- and 4-byte addressing, with ADS bit controlling current address mode and ADP bit setting power-up default.

Internal logic includes volatile/non-volatile status registers (SR1–SR3) managing block protection (BP3–BP0), quad enable (QE), output driver strength (DRV1/DRV0), and /HOLD or /RESET function selection. Erase/program suspend/resume capability enables concurrent background operations without interrupting host communication.

Key Specifications

Pinout & Package

W25Q256JWBIM uses the 8-pad WSON 6×5-mm package (Package Code P), with exposed thermal pad on bottom. Pin 1 is /CS, pin 2 is DO (IO1), pin 3 is /WP (IO2), pin 4 is GND, pin 5 is DI (IO0), pin 6 is CLK, pin 7 is /HOLD or /RESET (IO3), and pin 8 is VCC. /WP and /HOLD are functional only in Standard/Dual SPI modes; in Quad SPI, they become IO2 and IO3 respectively.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial flash memory applications.

Compared with MX25L25645GMI-10G and S25FL256SAGMFV001, the W25Q256JWBIM uniquely delivers 1.8V operation with DTR-enabled read acceleration, full SPI/QPI mode flexibility, and 8-pin WSON packaging - making it optimal for space-constrained, low-power, and XIP-capable embedded systems requiring firmware agility and security.

Availability

W25Q256JWBIM is available at Aetrix Electronics and suitable for boot code storage, firmware update partitions, and secure parameter retention requiring stable component supply across industrial, automotive, and IoT product lifecycles.

Supply support for W25Q256JWBIM 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 consumer, industrial, and communications markets.

The W25Q series targets high-performance, low-voltage embedded systems requiring robust code storage, secure firmware updates, and flexible interface compatibility - with W25Q256JWBIM optimized for compact 1.8V designs needing DTR-enhanced throughput and industrial-grade reliability.

FAQ

What is the operating voltage range for W25Q256JWBIM?

The W25Q256JWBIM operates from 1.7 V to 1.95 V. This narrow 1.8V nominal range ensures compatibility with modern ultra-low-power microcontrollers and SoCs while maintaining signal integrity and reducing dynamic power consumption. Operation outside this range may cause undefined behavior or permanent damage. The W25Q256JWBIM does not support 3.3V or dual-voltage operation.

Does W25Q256JWBIM support Quad SPI mode out of the box?

No - W25Q256JWBIM requires the Quad Enable (QE) bit in Status Register-2 to be set (via Write Status Register-2 instruction 31h) before Quad SPI functionality activates. Until QE=1, pins /WP and /HOLD remain dedicated hardware controls; after QE=1, they become IO2 and IO3. The W25Q256JWBIM defaults to Standard SPI mode at power-up.

What package type is used by W25Q256JWBIM?

W25Q256JWBIM uses the 8-pad WSON 6×5-mm package (Package Code P), with exposed thermal pad on the underside. It has no /RESET pin - the /HOLD pin serves dual function as /HOLD or /RESET depending on configuration, but in this variant (IM suffix), /HOLD is the default role unless explicitly remapped via HOLD/RST bit in Status Register-3.

Can W25Q256JWBIM be used for Execute-in-Place (XIP) applications?

Yes - W25Q256JWBIM supports XIP via Dual/Quad SPI Fast Read instructions (e.g., 3Bh, 6Bh, BBh, EBh) and DTR variants (BDh, EDh), delivering up to 532 MB/s effective throughput. Its 4KB uniform sector architecture, erase/program suspend/resume, and low-latency read enable deterministic code execution directly from flash in Cortex-M7/M33 and RISC-V cores with SPI memory-mapped peripherals.

How is hardware write protection implemented on W25Q256JWBIM?

W25Q256JWBIM implements hardware write protection using the /WP pin (active-low) in conjunction with Status Register bits SRP, SRL, BP3–BP0, TB, and CMP. When /WP is low and SRP=1, writes to status registers are blocked. Sector-level protection can be configured independently via BP bits and TB/CMP settings. The W25Q256JWBIM's /WP pin is disabled in Quad SPI mode (reassigned to IO2) and only functions in Standard/Dual SPI configurations.