Winbond Electronics Corporation W25N04KWZEIR

Overview

W25N04KWZEIR from Winbond is a 4G-bit (512MB) SLC QspiNAND Flash memory operating at 1.70–1.95V, supporting standard/Dual/Quad SPI up to 104MHz (416MHz equivalent in Quad I/O), with on-chip 8-bit ECC, 128KB uniform block erase, and dual read modes (Buffer Read and Sequential Read). It enables code shadowing, XIP execution, and data storage in space-constrained embedded systems.

For engineers reviewing the W25N04KWZEIR datasheet, W25N04KWZEIR pinout, W25N04KWZEIR application, or W25N04KWZEIR equivalent, key selection considerations include its 8-pin WSON 8×6-mm (ZE) package, configurable /WP and /HOLD pin roles, 60,000 program/erase cycles, 10-year data retention, and support for JEDEC ID, Unique ID, and ten 2KB OTP pages.

Technical Context

The W25N04KWZEIR integrates NAND flash architecture with SPI protocol compatibility, using a 262,144-page × 2,048-byte array organized into 4,096 erasable 128KB blocks. Its dual read modes-Buffer Read (default, BUF=1) and Sequential Read (BUF=0)-enable optimized access patterns: Buffer Read supports fast random page reads, while Sequential Read allows continuous streaming across the full memory array with a single command.

It implements volatile and OTP-configurable registers including Protection Register (SR-1), Configuration Register (SR-2), and Status Register-3, enabling hardware/software write protection, ECC enable/disable (ECC-E), output driver strength control (ODS[1:0]), and deep power-down (B9h/ABh). The device supports both standard SPI (DI/DO) and quad I/O (IO0–IO3), with /WP and /HOLD repurposed as IO2/IO3 in Quad mode.

Key Specifications

Pinout & Package

W25N04KWZEIR is packaged in an 8-pad WSON 8×6-mm (JEDEC MO-252, package code ZE), with exposed thermal pad. Pin functions are fully defined for Standard/Dual SPI operation; in Quad SPI mode, /WP and /HOLD become IO2 and IO3 respectively.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MX35LF4GEIM-12G, W25N04KWZEIR provides WSON packaging flexibility and unique Sequential Read mode; versus MT29F4G08ABAEAWP-AIT, it eliminates external ECC processing and simplifies host firmware by integrating SPI-native command set and on-die correction.

Availability

W25N04KWZEIR is available at Aetrix Electronics and suitable for industrial HMI firmware storage, automotive infotainment boot memory, and medical diagnostic data loggers requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for W25N04KWZEIR 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 global supplier of specialty DRAM, mobile DRAM, Code Storage Flash, and TrustME® secure flash memory, serving automotive, industrial, and consumer markets since 1987.

The W25N QspiNAND product line was designed to bridge the gap between traditional SPI NOR flash and high-density NAND, delivering NAND capacity with SPI simplicity - specifically targeting cost-sensitive, space-constrained embedded systems needing >128MB non-volatile storage.

FAQ

What is the package type and footprint of W25N04KWZEIR?

W25N04KWZEIR uses an 8-pad WSON 8×6-mm package (JEDEC MO-252, package code ZE) with exposed thermal pad. It is not pin-compatible with TFBGA variants (TB/TC) - those use 24-ball layouts and require separate layout design. The ZE package enables ultra-compact placement in space-limited modules such as wearable medical sensors and compact industrial gateways.

Does W25N04KWZEIR support execute-in-place (XIP) operation?

Yes, W25N04KWZEIR supports XIP via Dual and Quad SPI interfaces, allowing microcontrollers to execute code directly from flash without copying to RAM. This capability is enabled by its fast read performance (up to 50 MB/s sequential) and low-latency Fast Read Dual/Quad I/O instructions, making W25N04KWZEIR suitable for real-time embedded applications with memory constraints.

How does the /WP pin function in W25N04KWZEIR, and can it be disabled?

The /WP pin in W25N04KWZEIR operates in two modes controlled by the WP-E bit in Status Register-1: when WP-E=0, /WP serves as IO2 in Quad SPI and enables software-based block protection; when WP-E=1, /WP becomes a dedicated hardware lock that disables all writes and Quad reads if pulled low. It cannot be "disabled" - its role is configurable, but the pin remains electrically active in both modes.

What is the purpose of the Sequential Read Mode (BUF=0) in W25N04KWZEIR?

Sequential Read Mode (enabled by setting BUF=0 in Status Register-2) allows W25N04KWZEIR to stream data continuously across the entire 512MB memory array using a single read command - eliminating the need to issue new addresses for each page. This reduces host CPU overhead and improves throughput in firmware updates, media playback, and bulk data logging applications.

Can W25N04KWZEIR's OTP pages be erased or rewritten after programming?

No - the ten 2KB OTP (One-Time Programmable) pages in W25N04KWZEIR are permanently programmable only once. Once written, their contents cannot be erased or modified, even with power cycling or device reset. This makes them ideal for storing immutable data such as cryptographic keys, calibration constants, or unique device identifiers that must survive field updates and counterfeiting attempts.