Winbond Electronics Corporation W25N04KWTBIU TR

Overview

W25N04KWTBIU 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 erasable 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 integrity. It is used in embedded boot storage, firmware code shadowing, and data logging where pin-constrained 1.8V systems require high-density non-volatile memory.

For engineers reviewing the W25N04KWTBIU TR datasheet, W25N04KWTBIU TR pinout, W25N04KWTBIU TR application, or W25N04KWTBIU TR equivalent, key selection criteria include its dual/quad SPI compatibility, 128KB uniform block erase granularity, buffer vs. sequential read mode control (BUF bit), ECC enable/disable (ECC-E), and hardware/software write protection via /WP, /HOLD, and volatile/OTP-configurable status registers.

Technical Context

The W25N04KWTBIU TR implements a QspiNAND architecture that merges SPI command simplicity with NAND flash density. Its internal 2,048-byte page buffer enables full-page programming in one operation, while the 128KB block erase aligns with typical filesystem allocation units. 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/OTP-configurable status registers: SR-1 (protection & WP-E), SR-2 (ECC-E, ODS, H-DIS, OTP access), and SR-3 (ECC-1/0, P-FAIL, E-FAIL, BUSY). ECC operation is fully configurable-enabled/disabled per SR-2-and reports bit-flip counts (BFD/BFS/BFR/MBF) for reliability monitoring. Quad SPI mode repurposes /WP and /HOLD as IO2 and IO3, disabling their protection functions during active Quad transactions.

Key Specifications

Pinout & Package

W25N04KWTBIU TR is supplied in a 24-ball TFBGA 8x6-mm package (Package Code TB, 5×5 ball array), with all pins assigned per Winbond's official ball map. Pin functions are electrically identical to the WSON variant but mapped to a fine-pitch BGA layout optimized for high-density PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with W25N04KWTBIU TR, MX35LF4GEIM-12G offers identical density and voltage but sacrifices configurable read modes and ECC control, while MT29F4G08ABAEAWP-AIT provides raw NAND performance at the cost of system-level complexity and zero SPI compatibility-making W25N04KWTBIU TR the optimal balance of integration, configurability, and ease of adoption.

Availability

W25N04KWTBIU TR is available at Aetrix Electronics and suitable for industrial HMI boot storage, automotive infotainment firmware, and edge gateway data logging requiring stable component supply, long-term lifecycle assurance, and guaranteed traceable sourcing.

Supply support for W25N04KWTBIU 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 global semiconductor manufacturer specializing in specialty DRAM, mobile DRAM, and serial flash memory solutions since 1987.

The W25N QspiNAND product line was designed to bridge the gap between SPI NOR simplicity and NAND density-targeting embedded systems needing >1G-bit non-volatile storage without external controllers or complex ECC management.

FAQ

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

The W25N04KWTBIU TR supports two distinct read architectures controlled by the BUF bit in Status Register-2. Buffer Read (BUF=1, default) loads one 2,048-byte page into the internal buffer and outputs it in burst mode-ideal for random access or XIP. Sequential Read (BUF=0) streams data continuously across page boundaries with automatic address increment-optimized for bulk transfers like firmware loading or log retrieval. Both modes use separate instruction sets (e.g., 03h vs. 13h) and have different timing requirements.

Does the W25N04KWTBIU TR require an external ECC engine?

No, the W25N04KWTBIU TR includes a fully integrated 8-bit ECC engine that operates transparently on all memory array reads and writes when enabled via the ECC-E bit in Status Register-2. It reports correction status (ECC-1/0), bit-flip counts (BFR), and maximum observed errors (MBF) through dedicated status registers-eliminating the need for external ECC logic or host-side correction algorithms in most applications.

Can the /WP and /HOLD pins be used simultaneously in Quad SPI mode on the W25N04KWTBIU TR?

No. In Quad SPI mode, the /WP and /HOLD pins are repurposed as IO2 and IO3, respectively, and their hardware protection functions are disabled. The datasheet explicitly states that Quad SPI instructions require all four IO lines (IO0–IO3), and /WP and /HOLD lose their dedicated protection roles during active Quad transactions. To retain write protection in Quad mode, software-based protection using Block Protect bits (BP[3:0]) and SRP bits must be used instead.

What package type does the W25N04KWTBIU TR use, and how is it marked?

The W25N04KWTBIU TR uses a 24-ball TFBGA 8x6-mm package with a 5×5 ball array (Package Code TB). Top-side marking includes "W25N04KW" followed by date code and traceability symbols per Winbond's standard labeling convention. This package is RoHS-compliant, halogen-free, and qualified for reflow soldering per J-STD-020 moisture sensitivity level 3.

How many program/erase cycles does the W25N04KWTBIU TR guarantee, and what ensures its 10-year data retention?

The W25N04KWTBIU TR guarantees 60,000 program/erase cycles per block and 10-year data retention at +85°C-validated under JEDEC JESD22-A117 stress conditions. This reliability is achieved through SLC (Single-Level Cell) NAND architecture, on-die wear leveling support in host firmware, and built-in ECC that corrects bit errors before they accumulate to uncorrectable levels. Retention is further enhanced by the device's tight 1.70–1.95V VCC tolerance, which prevents over-stress during voltage transients.