Winbond Electronics Corporation W25N04KWTBIU

Overview

W25N04KWTBIU 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 clock (416MHz equivalent Quad I/O), with on-chip 8-bit ECC, 128KB uniform block erase, and dual read modes (Buffer Read and Sequential Read). It delivers 50MB/s sequential data transfer and targets embedded code storage, XIP execution, and firmware logging in space-constrained industrial controllers.

For engineers reviewing the W25N04KWTBIU datasheet, W25N04KWTBIU pinout, W25N04KWTBIU application, or W25N04KWTBIU equivalent, key selection considerations include its 1.8V operation, OTP page support (10 × 2KB), deep power-down current (2µA), configurable ECC enable (ECC-E bit), and dual-package availability (TFBGA 24-ball 8x6-mm and WSON 8x6-mm).

Technical Context

The W25N04KWTBIU implements a NAND flash architecture organized into 4,096 erasable 128KB blocks and 262,144 pages of 2,048 bytes each, with an internal 2KB buffer enabling full-page programming. Its command set supports both legacy SPI instructions and extended Dual/Quad I/O variants-including Fast Read Quad I/O (6Bh/6Ch) and Sequential Read mode (BUF=0)-enabling efficient large-array access without address reissuing.

Hardware-level protection is implemented via /WP and /HOLD pins (active-low), with programmable control through volatile and OTP-lockable registers: Block Protect bits (BP3–BP0), Write Protection Enable (WP-E), Status Register Protect (SRP1/SRP0), and ECC Enable (ECC-E). The device reports ECC status (ECC-1/ECC-0), program/erase failure (P-FAIL/E-FAIL), and busy state via dedicated status register bits.

Key Specifications

Pinout & Package

W25N04KWTBIU is packaged in a 24-ball TFBGA 8x6-mm (Package Code TB/TC, 5×5 or 6×4 ball array), compatible with standard surface-mount assembly processes and offering improved thermal performance over WSON for sustained write operations.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MX35LF4GEIM-12G and MT29F4G08ABAEAWP-AIT, W25N04KWTBIU uniquely integrates SPI-native NAND with Sequential Read Mode, on-chip ECC, and OTP pages-reducing host processing load, eliminating external controllers, and enabling secure, low-power firmware storage in minimal footprint.

Availability

W25N04KWTBIU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device boot image retention, and smart meter data logging requiring stable component supply, long-term lifecycle assurance, and qualified sourcing for regulated environments.

Supply support for W25N04KWTBIU 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 semiconductor company specializing in specialty memory solutions, including NOR/NAND flash, SRAM, and mobile DRAM, serving industrial, automotive, and consumer markets since 1987.

The W25N QspiNAND product line was designed to bridge the density gap between SPI NOR and traditional NAND, delivering NAND economics with SPI simplicity-targeting code storage, XIP, and firmware logging in resource-constrained embedded systems.

FAQ

What is the difference between Buffer Read Mode and Sequential Read Mode in W25N04KWTBIU?

In W25N04KWTBIU, Buffer Read Mode (BUF=1) uses the internal 2KB buffer to read one page at a time, requiring explicit address reissuing for each page. Sequential Read Mode (BUF=0) allows continuous read across multiple pages with a single command and auto-incrementing address-reducing instruction overhead and improving throughput for large data streams like firmware images or log files. This mode is enabled by clearing the BUF bit in Configuration Register (SR-2).

Does W25N04KWTBIU support Quad SPI commands with hardware write protection enabled?

No. When WP-E=1 in W25N04KWTBIU, the /WP pin becomes a dedicated hardware write-protect input, and all Quad SPI read operations-including Fast Read Quad I/O (6Bh/6Ch)-are disabled. Only Standard and Dual SPI reads remain functional. To use Quad SPI, WP-E must be set to 0, placing the device in Software Protection mode where /WP serves as IO2 and Quad I/O is fully operational.

How many OTP pages does W25N04KWTBIU provide, and what is their purpose?

W25N04KWTBIU provides ten 2KB OTP (One-Time Programmable) pages. These pages are used to store immutable data such as cryptographic keys, calibration coefficients, or device-specific identifiers that must never be altered after initial programming. Once written, OTP pages cannot be erased or rewritten-ensuring data integrity and compliance in security-critical applications like medical or automotive firmware.

What is the significance of the ECC-E bit in W25N04KWTBIU's Configuration Register?

The ECC-E bit (bit 4) in W25N04KWTBIU's Configuration Register (SR-2) enables or disables the on-chip 8-bit ECC engine. When ECC-E=1, the device automatically corrects up to 8-bit errors per 512-byte sector and reports correction status via ECC-1/ECC-0 bits in Status Register-3. When ECC-E=0, ECC is bypassed-useful for debugging or when host-side ECC is preferred. Disabling ECC reduces latency but removes hardware error resilience.

Can W25N04KWTBIU operate across the full industrial temperature range without derating?

Yes. W25N04KWTBIU is rated for -40°C to +85°C operation (industrial grade) and supports +105°C in Industrial Plus Grade variants. All electrical specifications-including 104MHz max clock, 25mA active current, and 60,000 P/E cycles-are guaranteed across this range without derating. Thermal performance is validated per JEDEC JESD22-A104 and JESD22-A108 standards, making it suitable for uncontrolled ambient deployments like outdoor utility meters or factory-floor controllers.