Winbond Electronics Corporation W25Q40CLZPIG

Overview

W25Q40CLZPIG from Winbond is a 4 M-bit (512 KB) serial NOR flash memory IC supporting Standard/Dual/Quad SPI interfaces, organized into 2048 × 256-byte pages and 128 uniform 4 KB sectors. It operates from 2.3 V to 3.6 V, draws 1 mA active current and <1 µA in power-down mode, and supports XIP execution with up to 104 MHz clock frequency - enabling high-speed code shadowing and firmware storage in space-constrained embedded systems.

For engineers reviewing the W25Q40CLZPIG datasheet, W25Q40CLZPIG pinout, W25Q40CLZPIG application, or W25Q40CLZPIG equivalent, key selection considerations include Quad SPI enable (QE bit), /WP and /HOLD pin reassignment in Quad mode, sector-level hardware/software write protection, JEDEC ID and 64-bit unique serial number support, and USON 2×3-mm package compatibility with PCB layout constraints.

Technical Context

The W25Q40CLZPIG implements a SPI-compatible command set with three operational modes: Standard SPI (DI/DO), Dual SPI (IO0/IO1), and Quad SPI (IO0–IO3), where /WP and /HOLD become IO2 and IO3 only when the non-volatile Quad Enable (QE) bit in Status Register-2 is set. Its internal architecture includes a 256-byte page buffer, status register with BUSY/WEL/BP/TB/SEC/QE bits, and SFDP register for configurable read parameters.

Write protection combines volatile (WEL latch) and non-volatile mechanisms (SRP0/SRP1, BP2–BP0, TB, SEC, CMP), allowing granular 4 KB sector lock via hardware (/WP pin) or software configuration. Erase/program suspend/resume functionality enables interruptible operations, and continuous read mode reduces instruction overhead to as few as 16 clocks for address setup - critical for true execute-in-place (XIP) performance.

Key Specifications

Pinout & Package

W25Q40CLZPIG is packaged in an 8-pad USON 2×3 mm (package code UX), featuring wettable flanks for automated optical inspection and compact footprint ideal for portable and IoT edge devices.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial NOR flash memory applications.

Compared with MX25L4006EM1I-12G and S25FL004KAGMFI011, W25Q40CLZPIG offers unique USON 2×3 mm packaging, integrated SFDP for runtime read optimization, and factory-programmed 64-bit UID - making it optimal for new designs prioritizing miniaturization, configurability, and security traceability.

Availability

W25Q40CLZPIG is available at Aetrix Electronics and suitable for IoT edge node firmware storage, industrial PLC boot code memory, and automotive infotainment boot ROM applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for W25Q40CLZPIG 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 flash, RAM, and mobile DRAM - serving industrial, automotive, and consumer markets since 1987.

The W25Q series targets embedded systems needing high-speed, low-power, and secure serial flash - designed specifically for code execution (XIP), firmware updates, and parameter storage in resource-constrained environments.

FAQ

What is the package type and footprint of W25Q40CLZPIG?

W25Q40CLZPIG uses an 8-pad USON 2×3 mm package (package code UX) with wettable flanks. This compact, lead-free footprint is optimized for automated optical inspection and high-density PCB layouts. It differs from SOIC variants (SN/SS) and is not pin-compatible with them - board design must allocate the exact 2×3 mm land pattern specified in Winbond's package drawing.

Does W25Q40CLZPIG support Quad SPI mode, and how is it enabled?

Yes, W25Q40CLZPIG supports Quad SPI mode via the non-volatile Quad Enable (QE) bit in Status Register-2. To activate it, issue a Write Status Register (01h) instruction with QE = 1. Once set, /WP and /HOLD pins become IO2 and IO3, enabling four-line data transfer using instructions like EBh (Fast Read Quad I/O). The change persists across power cycles unless explicitly cleared.

How does hardware write protection work on W25Q40CLZPIG?

Hardware write protection on W25Q40CLZPIG is implemented via the /WP pin, which - when held low during Standard or Dual SPI operation - prevents writes to the status register. This works in conjunction with block protect bits (BP2–BP0), top/bottom select (TB), and sector/block protect (SEC) to lock regions as small as 4 KB. Note: /WP is reassigned to IO2 in Quad SPI mode and cannot provide hardware protection there.

What is the purpose of the 64-bit Unique ID in W25Q40CLZPIG?

The 64-bit Unique ID in W25Q40CLZPIG is a factory-programmed, read-only serial number accessible via instruction 4Bh. It enables device-specific cryptographic binding, firmware version tracking, and anti-counterfeiting in secure boot chains. Unlike software-generated IDs, it requires no initialization and remains unchanged across erases, making it ideal for medical, automotive, and industrial traceability requirements.

Can W25Q40CLZPIG be used for execute-in-place (XIP) applications?

Yes, W25Q40CLZPIG supports true execute-in-place (XIP) via its Continuous Read Mode and Quad SPI interface. With Fast Read Quad I/O (EBh) and ≤16-clock address setup overhead, it delivers deterministic, low-latency instruction fetches directly from flash - eliminating need for external RAM buffering. This is validated in Winbond's application notes for ARM Cortex-M and RISC-V microcontrollers.