Winbond Electronics Corporation W25N04KWZEIU TR

Overview

W25N04KWZEIU TR from Winbond is a 1.8V SLC QspiNAND Flash memory IC with 4G-bit (512MB) capacity, organized as 262,144 × 2,048-byte pages and 4,096 × 128KB erase blocks. It supports Standard/Dual/Quad SPI interfaces up to 104MHz clock (416MHz equivalent Quad I/O), delivers 50MB/s sequential read throughput, and integrates on-die 8-bit ECC for NAND reliability. It is used in embedded systems requiring code shadowing, XIP execution, and firmware/data storage under space- and pin-constrained layouts.

For engineers reviewing the W25N04KWZEIU TR datasheet, W25N04KWZEIU TR pinout, W25N04KWZEIU TR application, or W25N04KWZEIU TR equivalent, key selection considerations include its 1.7–1.95V supply range, dual/quad SPI command compatibility, buffer vs. sequential read mode control (BUF bit), OTP page programmability (10 × 2KB), and hardware/software write protection via /WP, /HOLD, and volatile/OTP-configurable status registers.

Technical Context

The W25N04KWZEIU TR implements a QspiNAND architecture that merges SPI serial interface simplicity with NAND flash density. Its memory array uses SLC cells with uniform 128KB block erase granularity and supports both Buffer Read (default, BUF=1) and Sequential Read (BUF=0) modes - the latter enabling single-command full-array access without address reissuing.

It features three configurable status registers: SR-1 (volatile/OTP-lockable protection bits BP3–BP0, WP-E, SRP1/SRP0), SR-2 (volatile configuration including ECC-E, ODS-1/ODS-0, H-DIS, BUF), and SR-3 (read-only status flags like BUSY, P-FAIL, E-FAIL, ECC-1/ECC-0). Internal ECC operates transparently during read/program, with cumulative bit-flip reporting via BFD/BFS/BFR/MBF registers.

Key Specifications

Pinout & Package

W25N04KWZEIU TR is packaged in an 8-pad WSON 8×6-mm (package code ZE), with exposed thermal pad. This RoHS-compliant, surface-mount package supports high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MX35LF4GEIM-12G, W25N04KWZEIU TR offers superior ECC observability and more OTP capacity for secure provisioning; versus MT29F4G08ABAEAWP-AITX1, it eliminates NAND controller dependency and reduces BOM count by integrating SPI protocol logic and on-die ECC.

Availability

W25N04KWZEIU TR is available at Aetrix Electronics and suitable for industrial HMI firmware storage, IoT edge node code execution, and medical diagnostic data logging requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for W25N04KWZEIU 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 company specializing in specialty DRAM, mobile DRAM, and serial flash memory solutions for consumer, industrial, and automotive markets.

The W25N QspiNAND product line was designed to replace parallel NAND in space-constrained embedded systems by delivering NAND density with SPI simplicity, targeting code storage, XIP execution, and firmware update applications.

FAQ

What is the difference between Buffer Read and Sequential Read modes in W25N04KWZEIU TR?

Buffer Read (BUF=1, default) loads one page (2,048 bytes) into the internal buffer per Read Data (03h) command, requiring repeated address issuance for multi-page access. Sequential Read (BUF=0) allows continuous reading across the entire memory array with a single command - ideal for streaming media or firmware images. The mode is selected via the BUF bit in Status Register-2 and affects timing, throughput, and host software design.

Does W25N04KWZEIU TR support Quad SPI commands with 4-byte addressing?

Yes, W25N04KWZEIU TR supports Fast Read Quad I/O with 4-byte address (ECh) and Quad Load Program Data with 4-byte address (34h), enabling full 4G-bit address space access without bank switching. These instructions require the 4-byte address mode to be enabled via the appropriate status register bit and are fully compliant with JEDEC JESD216B standard for extended addressability.

How is hardware write protection implemented on W25N04KWZEIU TR?

Hardware write protection on W25N04KWZEIU TR is activated by setting the WP-E bit in Status Register-1. When WP-E=1, the /WP pin becomes a dedicated active-low input: tying it to GND disables all write/program/erase operations - including memory, registers, and OTP pages - making the device fully read-only. Quad SPI read commands are also disabled in this mode, ensuring strict enforcement of firmware immutability.

Can W25N04KWZEIU TR's internal ECC be disabled?

No, W25N04KWZEIU TR's internal 8-bit ECC cannot be disabled; it operates transparently during all read and program operations. However, the ECC Enable bit (ECC-E) in Status Register-2 controls whether ECC status bits (ECC-1/ECC-0) are updated and reported - setting ECC-E=0 suppresses status updates but does not disable correction. ECC functionality remains active regardless of ECC-E state.

What package types are available for W25N04KWZEIU TR, and what does 'ZE' signify?

W25N04KWZEIU TR is offered in an 8-pad WSON 8×6-mm package, where 'ZE' is Winbond's official package code per ordering information (Section 12.1). This variant features a bottom-exposed thermal pad for improved heat dissipation and is distinct from TFBGA variants (TB/TC). The 'TR' suffix indicates tape-and-reel packaging for automated assembly, and 'IU' denotes industrial temperature grade (-40°C to +85°C).