Winbond Electronics Corporation W25N04KWTBIR TR

Overview

W25N04KWTBIR 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-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 W25N04KWTBIR TR datasheet, W25N04KWTBIR TR pinout, W25N04KWTBIR TR application, or W25N04KWTBIR TR equivalent, key selection considerations include its TFBGA-24 (8×6mm, 5×5 ball array, package code TB) footprint, dual/quad SPI command compatibility, buffer vs. sequential read mode configuration (BUF bit), ECC enable control (ECC-E), and hardware/software write protection via /WP and SRP/BP bits.

Technical Context

The W25N04KWTBIR TR implements a QspiNAND architecture that merges SPI serial interface simplicity with NAND flash density and cost efficiency. Its memory array uses SLC (Single-Level Cell) technology, enabling 60,000 program/erase cycles and 10-year data retention at -40°C to +85°C. The device supports two distinct read modes-Buffer Read (default, BUF=1) and Sequential Read (BUF=0)-each with dedicated instruction sets and timing profiles.

It features three volatile status registers (SR-1 to SR-3) and extended ECC registers (BFD, BFS, BFR, MBF/MFS), all accessible via standard SPI commands. Write protection is implemented through a hybrid scheme: software-controlled Block Protect (BP3–BP0) and Status Register Protect (SRP1/SRP0) bits, plus hardware-enforced protection when WP-E=1 and /WP is grounded-disabling all write/erase operations including OTP programming and register updates.

Key Specifications

Pinout & Package

W25N04KWTBIR TR uses a 24-ball TFBGA package (8×6mm, 5×5 ball array, package code TB), with 8 active signal balls and 16 no-connect (NC) positions. Ball assignments follow JEDEC MO-270DA standard; /CS, CLK, DI (IO0), DO (IO1), /WP (IO2), and /HOLD (IO3) are functional I/Os, while VCC and GND provide power and ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with W25N04KVTAIG TR, W25N04KWTBIR TR offers superior mechanical stability and thermal performance in TFBGA; versus GD5F4GQ4UCYIGR, it delivers plug-and-play ECC and seamless SPI ecosystem integration at the cost of lower maximum interface speed.

Availability

W25N04KWTBIR TR is available at Aetrix Electronics and suitable for industrial HMI boot storage, medical device firmware archive, and smart meter data logging requiring stable component supply across long-lifecycle programs.

Supply support for W25N04KWTBIR 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 memory solutions, including SPI NOR/NAND, mobile DRAM, and code storage flash products since 1987.

The W25N QspiNAND product line was designed to bridge the density gap between serial NOR and parallel NAND, delivering NAND economics with SPI simplicity for resource-constrained embedded systems.

FAQ

What is the package type and footprint of W25N04KWTBIR TR?

W25N04KWTBIR TR uses a 24-ball TFBGA package measuring 8mm × 6mm with a 5×5 ball array (package code TB). It has eight functional balls (/CS, CLK, DI/IO0, DO/IO1, /WP/IO2, /HOLD/IO3, VCC, GND) and sixteen no-connect (NC) balls. This footprint complies with JEDEC MO-270DA and supports automated optical inspection and reflow soldering in high-volume manufacturing.

Does W25N04KWTBIR TR support both buffer and sequential read modes, and how are they selected?

Yes, W25N04KWTBIR TR supports both Buffer Read (default, BUF=1) and Sequential Read (BUF=0) modes. The BUF bit resides in Configuration Register (Status Register-2, address Bxh) and is volatile-cleared on power-up or reset. Setting BUF=0 enables single-command full-array access with automatic address incrementing, while BUF=1 requires explicit address transmission per read cycle. Mode selection is done via Write Status Register (1Fh) instruction.

How does the on-chip ECC in W25N04KWTBIR TR operate, and how can it be monitored?

W25N04KWTBIR TR includes an integrated 8-bit ECC engine that corrects up to 8 bit errors per 512-byte sector. ECC is enabled via the ECC-E bit in Status Register-2. Correction status is reported in Status Register-3 (Cxh): ECC-1/ECC-0 bits indicate number of corrected bits (00=none, 01=1–4, 10=5–8, 11=unrecoverable). Extended registers (BFS, BFR, MBF/MFS) provide cumulative bit-flip counts for predictive failure analysis.

Can W25N04KWTBIR TR be used as a direct replacement for standard SPI NOR flash in existing designs?

W25N04KWTBIR TR is not a pin-compatible or functional drop-in replacement for SPI NOR flash due to fundamental differences in command set, erase granularity (128KB blocks vs. 4KB sectors), and lack of execute-in-place (XIP) support without external buffering. However, its Standard SPI instruction subset (e.g., 03h Read Data, 06h Write Enable) allows reuse of basic driver infrastructure-full migration requires NAND-aware file system and wear leveling adaptation.

What are the write protection options available on W25N04KWTBIR TR?

W25N04KWTBIR TR offers three-tiered write protection: (1) Software protection via Block Protect (BP3–BP0) and Status Register Protect (SRP1/SRP0) bits in SR-1, configurable per 512KB block or globally; (2) Hardware protection activated by setting WP-E=1 and grounding /WP, which disables all write/erase operations including OTP programming; (3) OTP lock bits (SR1-L, OTP-L) permanently prevent further modification of protection registers after programming.