Winbond Electronics Corporation W25N04KWTCIR

Overview

W25N04KWTCIR 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, delivers 50MB/s sequential read throughput, and integrates on-chip 8-bit ECC for NAND array reliability. It is used in embedded boot storage, firmware code shadowing, and data logging where space-constrained PCBs require high-density non-volatile memory with low-power operation.

For engineers reviewing the W25N04KWTCIR datasheet, W25N04KWTCIR pinout, W25N04KWTCIR application, or W25N04KWTCIR equivalent, this page provides verified package mapping (WSON 8x6-mm ZE / TFBGA 8x6-mm TB/TC), confirmed dual/quad SPI timing compliance, ECC configuration register behavior, buffer vs. sequential read mode selection, and hardware/software write protection logic - all directly extracted from Winbond's official Revision C datasheet.

Technical Context

The W25N04KWTCIR implements a QspiNAND architecture that merges SPI command compatibility with NAND flash density. Its internal 2,048-byte page buffer enables single-cycle page programming, while 128KB uniform block erase supports wear leveling in managed NAND systems. The device uses volatile and OTP-lockable status registers (SR-1/SR-2) to control BP bits, ECC enable (ECC-E), buffer/sequential read mode (BUF), and output driver strength (ODS).

It supports two distinct read modes: Buffer Read (BUF=1, default) for random access with internal caching, and Sequential Read (BUF=0) for continuous streaming across the full array with one command. Quad I/O operations repurpose /WP and /HOLD as IO2/IO3 only when WP-E=0; when WP-E=1, those pins become dedicated active-low hardware write protect inputs, disabling all program/erase functions including Quad reads.

Key Specifications

Pinout & Package

W25N04KWTCIR is available in two RoHS-compliant packages: 8-pad WSON 8×6 mm (package code ZE) and 24-ball TFBGA 8×6 mm (package codes TB for 5×5 ball array, TC for 6×4). Both packages support identical pin functions and electrical behavior.

Key Features

Applications

Equivalent & Alternatives

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

Compared with W25N04KWTCIR, MX35LF4GEIM offers identical density and voltage but demands firmware adaptation for ECC and read-mode control, while MT29F4G08ABADAWP is a fundamentally different interface requiring NAND controller hardware and full BBT/ECC stack - neither is pin- or code-compatible.

Availability

W25N04KWTCIR is available at Aetrix Electronics and suitable for industrial HMI boot storage, edge AI sensor firmware, medical diagnostic data logging, and automotive infotainment cache applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for W25N04KWTCIR 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 memory solutions, including serial flash, mobile DRAM, and code storage devices for embedded and consumer markets.

The W25N QspiNAND product line was designed to bridge the gap between SPI NOR density limitations and traditional NAND complexity - delivering NAND-level capacity with SPI-level ease of integration for resource-constrained microcontrollers and SoCs.

FAQ

What is the difference between Buffer Read and Sequential Read modes in W25N04KWTCIR?

W25N04KWTCIR supports two read architectures controlled by the BUF bit in Status Register-2. Buffer Read (BUF=1) loads data into an internal 2,048-byte buffer before output, optimizing random access. Sequential Read (BUF=0) streams data continuously from the memory array with a single command, achieving 50MB/s throughput. The mode affects instruction selection (e.g., 03h vs. 13h) and timing behavior - both are fully supported in W25N04KWTCIR per Revision C datasheet Section 1 and 8.2.

Does W25N04KWTCIR support Quad SPI operation with hardware write protection enabled?

No - when WP-E=1 in W25N04KWTCIR, the /WP and /HOLD pins become dedicated active-low hardware write protect inputs, and all Quad SPI read operations are disabled. Only Standard and Dual SPI reads remain functional. This restriction is explicitly defined in Section 4.3 of the datasheet: "Quad SPI read operations are also disabled when WP-E is set to 1." W25N04KWTCIR enforces this behavior at silicon level.

How many OTP pages does W25N04KWTCIR provide, and what are their usage constraints?

W25N04KWTCIR includes ten 2,048-byte OTP pages, plus one parameter page and one Unique ID page. As stated in Section 2 Features and 8.2.23, OTP pages can only be programmed once - no erase or rewrite is possible. They are intended for immutable data such as calibration coefficients, security keys, or device serialization. Programming requires OTP-E=1 and follows the Load Program Data (02h) sequence with OTP access mode enabled.

What is the role of the ECC-E bit in W25N04KWTCIR, and how does it affect read performance?

The ECC-E bit (bit 4 of Status Register-2, address Bxh) globally enables or disables the on-chip 8-bit ECC engine in W25N04KWTCIR. When ECC-E=1, all read operations perform real-time error correction and populate ECC status bits (ECC-1/ECC-0); when ECC-E=0, reads bypass correction and return raw data. Disabling ECC reduces latency slightly but forfeits bit-error resilience - critical for mission-critical storage in W25N04KWTCIR applications.

Which package variants are available for W25N04KWTCIR, and are they pin-compatible?

W25N04KWTCIR is offered in three package variants: 8-pad WSON 8×6 mm (ZE), 24-ball TFBGA 8×6 mm with 5×5 ball array (TB), and 24-ball TFBGA 8×6 mm with 6×4 ball array (TC). All share identical pin functions and signal assignments per Sections 3.1–3.4 and Figures 1–2. While ball/pad locations differ between WSON and TFBGA, each package type maintains full functional and timing equivalence - W25N04KWTCIR's electrical behavior is package-agnostic.