Winbond Electronics Corporation W25N04KVTCIR

Overview

W25N04KVTCIR from Winbond is a 4G-bit (512MB) SLC QspiNAND Flash memory IC supporting Dual/Quad SPI interfaces, 104MHz clock rate, on-chip 8-bit ECC, and 128KB uniform block erase - deployed in embedded boot code storage, firmware update partitions, and industrial data logging systems.

For engineers reviewing the W25N04KVTCIR datasheet, W25N04KVTCIR pinout, W25N04KVTCIR application, or W25N04KVTCIR equivalent, key selection criteria include buffer vs. sequential read mode configuration, /WP and /HOLD functional mode dependency on SR-1 settings, OTP page programmability, and TFBGA-24 (6x4 ball array) mechanical compatibility with high-density PCB layouts.

Technical Context

The W25N04KVTCIR implements a QspiNAND architecture combining SPI command set compatibility with NAND-style page/block organization: 262,144 × 2,048-byte pages, 2,048 erasable 128KB blocks, and internal 2,048-byte buffer for single-page programming. It supports three operational modes - Standard SPI (DI/DO), Dual SPI (IO0/IO1), and Quad SPI (IO0–IO3) - with Fast Read Quad I/O achieving up to 416MHz equivalent throughput.

Its register system includes volatile and OTP-lockable Protection Register (SR-1), volatile Configuration Register (SR-2) with ECC-E, BUF, and ODS bits, and status-only SR-3 reporting ECC bit-flip counts and P-FAIL/E-FAIL flags. The /WP and /HOLD pins serve dual roles: dedicated control inputs in Standard/Dual mode, but repurposed as IO2/IO3 in Quad mode when WP-E = 0.

Key Specifications

Pinout & Package

W25N04KVTCIR uses the 24-ball TFBGA 8×6-mm package with 6×4 ball array (package code TC), compliant with JEDEC MO-270AB. Pin assignments follow standard SPI signal mapping with multiplexed I/O functionality dependent on instruction mode.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MX35LF4GEIM-12G, W25N04KVTCIR offers superior flexibility via user-configurable BUF bit and integrated ECC registers; versus MT29F4G08ABBDAH4-IT, it eliminates external controller dependency and reduces BOM count by embedding SPI protocol logic and ECC correction.

Availability

W25N04KVTCIR is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device boot image hosting, and smart meter data logging requiring stable component supply across extended product lifecycles.

Supply support for W25N04KVTCIR 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 manufacturer specializing in specialty memory solutions, including SPI NOR/NAND, mobile DRAM, and code storage flash products.

The W25N QspiNAND product line targets space-constrained embedded systems needing NAND density with SPI simplicity - designed specifically for code shadowing, XIP execution, and firmware update partitioning without external controllers.

FAQ

What is the package type and footprint of W25N04KVTCIR?

W25N04KVTCIR uses the 24-ball TFBGA 8×6-mm package with 6×4 ball array (JEDEC MO-270AB, package code TC). Its footprint matches standard 0.5-mm pitch TFBGA layouts and is compatible with automated SMT assembly. The pinout supports SPI signal routing with /WP and /HOLD repurposed as IO2/IO3 in Quad mode - requiring careful PCB signal assignment per the datasheet's Figure 1b and Section 3.4.

Does W25N04KVTCIR support execute-in-place (XIP) operation?

Yes, W25N04KVTCIR supports XIP via Dual/Quad SPI interfaces, enabling direct code execution from flash without copying to RAM. This is confirmed in Section 1 of the datasheet, which states it is "ideal for code shadowing to RAM, executing code directly from Dual/Quad SPI (XIP)." Performance is optimized using Fast Read Quad I/O instructions (6Bh/6Ch) at up to 416 MHz equivalent throughput.

How does the /WP pin function in W25N04KVTCIR, and can it be disabled?

The /WP pin in W25N04KVTCIR operates in two modes controlled by the WP-E bit in Status Register-1: when WP-E = 0, it serves as IO2 in Quad SPI and provides software-based SR-1 protection; when WP-E = 1, it becomes a dedicated active-low hardware write-protect input disabling all program/erase functions. It cannot be fully disabled but its role is configurable - no external pull-up/down is required unless holding a specific logic state during power-up.

What is the purpose of the BUF bit in W25N04KVTCIR's Configuration Register?

The BUF bit (bit 7 of Status Register-2) selects between Buffer Read Mode (BUF = 1, default) and Sequential Read Mode (BUF = 0). In Sequential Read Mode, a single Read command accesses the entire memory array contiguously, eliminating per-page address overhead - critical for high-throughput streaming applications like firmware validation or log retrieval. This mode is explicitly documented in Sections 1 and 7.2.7.

Can W25N04KVTCIR's OTP pages be erased or rewritten after programming?

No, W25N04KVTCIR's ten 2,048-byte OTP pages are one-time programmable: once written, they cannot be erased or modified. Programming is performed using standard SPI commands (e.g., Load Program Data + Program Execute) under OTP-E = 1 mode, as defined in Section 8.2.23. The OTP-L bit (SR-2, bit 7) permanently locks the OTP region after initial programming, preventing accidental overwrite.