Winbond Electronics Corporation W25Q256FVEIQ TR

Overview

W25Q256FVEIQ TR from Winbond is a 256M-bit (32MB) serial NOR flash memory supporting Standard/Dual/Quad SPI and QPI interfaces, operating at 2.7–3.6V with 104MHz clock, 4KB uniform sectors, and 4mA active current. It enables XIP execution in embedded boot code storage, firmware update storage, and parameter retention in industrial controllers.

For engineers reviewing the W25Q256FVEIQ TR datasheet, W25Q256FVEIQ TR pinout, W25Q256FVEIQ TR application, or W25Q256FVEIQ TR equivalent, key selection criteria include 4-byte addressing support, Quad Enable (QE) bit configuration, /HOLD or /RESET dual-function pin behavior in WSON-8 package, and JEDEC SFDP register compatibility for auto-configuration.

Technical Context

The W25Q256FVEIQ TR implements a flexible SPI-compatible command set with three address modes (3-byte, 4-byte, and ADP-configurable power-up mode), enabling seamless migration from legacy 16MB devices. Its status register architecture includes volatile/non-volatile BP bits, QE bit (SR2[1]), HOLD/RST function select (SR2[0]), and DRV strength control (SR2[6:5]).

It supports concurrent erase/program suspend-resume, individual sector/block lock/unlock via dedicated instructions (36h/39h/3Dh), and hardware write protection using /WP and /HOLD pins-active only in Standard/Dual SPI mode when QE=0. The device integrates three 256-byte one-time-programmable security registers with OTP locks.

Key Specifications

Pinout & Package

W25Q256FVEIQ TR is packaged in an 8-pad WSON 8×6 mm (Package Code E) with wettable flank profile, RoHS-compliant, and halogen-free. 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); Pin 8 is VCC. /WP and /HOLD functions are disabled in Quad SPI mode (QE=1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MX25L25635FMI-10G and S25FL256SAGMFI000, the W25Q256FVEIQ TR delivers superior instruction efficiency via QPI, tighter timing control for XIP, and integrated /HOLD or /RESET flexibility in WSON-8-making it optimal for resource-constrained boot and firmware update architectures.

Availability

W25Q256FVEIQ TR is available at Aetrix Electronics and suitable for boot code storage, firmware update storage, and parameter & configuration storage requiring stable component supply, long-term lifecycle assurance, and industrial temperature compliance.

Supply support for W25Q256FVEIQ TR 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 DRAM, mobile DRAM, and serial flash memory solutions since 1987.

The W25Q series targets high-performance, space-constrained embedded systems requiring reliable code storage, fast XIP execution, and robust security features-designed specifically for industrial, automotive, and networking applications.

FAQ

What is the package type and lead finish of W25Q256FVEIQ TR?

W25Q256FVEIQ TR uses an 8-pad WSON 8×6 mm package (Package Code E) with wettable flank profile, lead-free (RoHS-compliant), and halogen-free construction. The "EIQ" suffix denotes industrial temperature grade (–40°C to +85°C) and tape-and-reel packaging with IQC traceability. This package supports reflow soldering per J-STD-020 and provides enhanced thermal dissipation over standard SOIC variants.

Does W25Q256FVEIQ TR support 4-byte addressing, and how is it enabled?

Yes, W25Q256FVEIQ TR supports both 3-byte and 4-byte addressing modes. 4-byte mode is entered via the Enter 4-Byte Address Mode instruction (B7h) and exited with Exit 4-Byte Address Mode (E9h). The Power-Up Address Mode (ADP) bit in Status Register-3 determines default mode after reset; ADP=1 selects 4-byte mode at power-up. This is essential for accessing the full 32MB address space beyond the 16MB limit of 3-byte mode.

How does the /HOLD or /RESET pin function in W25Q256FVEIQ TR?

In W25Q256FVEIQ TR's WSON-8 package, Pin 7 serves as either /HOLD or /RESET depending on the HOLD/RST bit (SR2[0]) and QE bit (SR2[1]). When QE=0, HOLD/RST=0 configures it as /HOLD (active-low pause); HOLD/RST=1 configures it as /RESET (active-low device reset). When QE=1, this pin becomes IO3 and /HOLD or /RESET functionality is disabled-requiring external reset circuitry if needed.

What is the role of the Quad Enable (QE) bit in W25Q256FVEIQ TR?

The Quad Enable (QE) bit is bit 1 of Status Register-2 (SR2). When QE=0, /WP and /HOLD pins retain their hardware protection functions; when QE=1, those pins become IO2 and IO3 for Quad SPI operation. QE is non-volatile and persistent across power cycles. It must be set via Write Status Register-2 (31h) before issuing Quad SPI commands; failure to set QE results in unrecognized instructions or bus contention.

Can W25Q256FVEIQ TR be used for Execute-in-Place (XIP) applications?

Yes, W25Q256FVEIQ TR is explicitly designed for XIP operation. Its Continuous Read Mode with ≤8-clock instruction overhead, Fast Read Quad I/O (6Bh/6Ch), and QPI interface enable deterministic low-latency access. Verified XIP performance includes sub-50ns effective read latency in Quad I/O mode at 104MHz, supporting direct code execution from flash in Cortex-M4/M7 and RISC-V SoCs without intermediate RAM loading.