Winbond Electronics Corporation W25N04KWTCIR TR

Overview

W25N04KWTCIR TR from Winbond is a 4G-bit (512MB) SLC QspiNAND Flash memory operating at 1.7–1.95V, 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 systems.

For engineers reviewing the W25N04KWTCIR TR datasheet, W25N04KWTCIR TR pinout, W25N04KWTCIR TR application, or W25N04KWTCIR TR equivalent, key selection considerations include its 1.8V operation, OTP page support, configurable ECC enablement, hardware/software write protection, and compatibility with legacy SPI controllers via standard instruction set.

Technical Context

The W25N04KWTCIR TR implements a QspiNAND architecture combining SPI interface simplicity with NAND density: 262,144 × 2,048-byte pages organized into 4,096 × 128KB erasable blocks. Its dual read modes-Buffer Read (default, BUF=1) and Sequential Read (BUF=0)-enable optimized access patterns: the former supports fast random-page reads using internal 2KB buffer, while the latter allows continuous streaming across the full array with single command initiation.

It integrates volatile and OTP-configurable registers for protection (BP3–BP0, WP-E, SRP1/SRP0), configuration (ECC-E, ODS-0/1, H-DIS), and status monitoring (ECC-1/ECC-0, P-FAIL, E-FAIL, BUSY). The device supports JEDEC ID, Unique ID page, parameter page, and ten 2KB OTP pages-all accessible only after enabling OTP access mode (OTP-E=1).

Key Specifications

Pinout & Package

W25N04KWTCIR TR is supplied in an 8-pad WSON 8×6-mm package (JEDEC MO-252, package code ZE), with exposed thermal pad. Pin functions are electrically identical across WSON and TFBGA variants, supporting drop-in layout reuse where footprint permits.

Key Features

Applications

Equivalent & Alternatives

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

Compared with W25N04KWTCIR TR, MX35LF4GEIM-12G offers simpler register mapping but forfeits sequential access efficiency and secure OTP storage, while MT29F4G08ABAEAWP-AIT demands external controller resources and increases BOM cost-making W25N04KWTCIR TR optimal for SPI-native, space-constrained, and security-aware designs.

Availability

W25N04KWTCIR TR is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device boot image hosting, smart meter application code deployment, automotive telematics logging, and secure IoT edge node configuration requiring stable component supply and long-term lifecycle assurance.

Supply support for W25N04KWTCIR 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 NOR/NAND flash, RAM, and voice ICs, serving industrial, automotive, and consumer markets since 1987.

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

FAQ

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

Buffer Read (default, BUF=1) loads one 2KB page into the internal buffer for fast random access; Sequential Read (BUF=0) enables continuous streaming across multiple pages with a single command, eliminating address retransmission overhead. This makes W25N04KWTCIR TR uniquely efficient for firmware dumps or log retrieval where linear access dominates.

Does W25N04KWTCIR TR support true Quad SPI pinout and instruction set compatibility with standard SPI flash devices?

Yes, W25N04KWTCIR TR supports standard SPI commands (03h, 0Bh, etc.) and extends them to Dual/Quad I/O modes (3Bh, 6Bh, EBh, etc.) using the same pin assignments. Its instruction set is backward-compatible with common SPI flash controllers, though some advanced features like Sequential Read require updated driver support not found in generic NOR flash drivers.

How is write protection implemented on W25N04KWTCIR TR, and can it be locked permanently?

W25N04KWTCIR TR implements three-tier write protection: software (via BP bits and WP-E in Status Register-1), hardware (via /WP pin when WP-E=1), and OTP-lockable (SRP0/SRP1 bits). Once SRP bits are set to OTP-lock mode, the protection register becomes permanently immutable-preventing unauthorized modification of block protection settings even after power cycles.

What is the purpose and accessibility method for the ten 2KB OTP pages in W25N04KWTCIR TR?

The ten 2KB OTP pages in W25N04KWTCIR TR store immutable data such as cryptographic keys or calibration constants. They are accessed only after setting OTP-E=1 in Status Register-2 to enter OTP access mode; once programmed, individual bytes cannot be rewritten, and the OTP-E bit itself is OTP-lockable to prevent mode re-entry.

Is W25N04KWTCIR TR qualified for extended temperature operation, and what is its industrial grade specification?

W25N04KWTCIR TR is rated for -40°C to +85°C operation and supports +105°C in Industrial Plus Grade configurations. Its 10-year data retention is guaranteed across this full range, and electrical characteristics-including 104MHz clock timing and 25mA active current-are validated per JEDEC JESD47 stress testing protocols for industrial reliability.