Winbond Electronics Corporation W25Q40BWZPIG

Overview

W25Q40BWZPIG from Winbond is a 4M-bit (512KB) serial NOR flash memory IC designed for embedded code storage and XIP (execute-in-place) applications. It operates on a single 1.65–1.95V supply, supports Standard/Dual/Quad SPI interfaces with up to 80MHz clock rate, delivers 40MB/s continuous read throughput, and features uniform 4KB sector erase architecture with 100,000 program/erase cycles and 20-year data retention.

For engineers reviewing the W25Q40BWZPIG datasheet, W25Q40BWZPIG pinout, W25Q40BWZPIG application, or W25Q40BWZPIG equivalent, this page provides verified package mapping (8-pad WSON 6×5mm), confirmed Quad SPI enable behavior (QE bit in Status Register-2), hardware write protection via /WP and /HOLD pins, JEDEC ID and 64-bit unique serial number support, and real-world timing constraints for power-up, hold, and suspend/resume operations.

Technical Context

The W25Q40BWZPIG implements a SPI command-driven architecture with three operational modes: Standard SPI (DI/DO unidirectional), Dual SPI (IO0/IO1 bidirectional), and Quad SPI (IO0–IO3 bidirectional, enabled only when QE=1 in Status Register-2). Its block diagram includes a 256-byte page buffer, column/row decode logic, high-voltage generators for erase/program, and dedicated write protect logic interfacing with both software-configurable status bits and hardware /WP pin control.

Functional operation relies on dual status registers: Status Register-1 (BUSY, WEL, BP2–BP0, TB, SEC, CMP, SRP1/SRP0, SUS) and Status Register-2 (QE, LB3–LB0, security register locks). Erase granularity is fixed at 4KB sectors (128 total), 32KB blocks (8 total), and 64KB blocks (8 total); page programming is limited to ≤256 bytes per operation, with suspend/resume capability during active erase or program cycles.

Key Specifications

Pinout & Package

W25Q40BWZPIG is packaged in an 8-pad WSON 6×5mm (package code ZP), with exposed pad for thermal dissipation and no internal heatsink requirement under typical 4mA active current.

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, W25Q40BWZPIG uniquely delivers Quad SPI functionality at 1.8V with 40MB/s throughput and integrated security registers - making it optimal for space-constrained, low-voltage XIP and secure firmware storage applications.

Availability

W25Q40BWZPIG is available at Aetrix Electronics and suitable for boot code storage, firmware over-the-air updates, audio playback buffering, industrial configuration storage, and secure key management requiring stable component supply across production lifecycles.

Supply support for W25Q40BWZPIG 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 serial NOR/NAND flash, RAM, and mobile DRAM.

The W25Q series targets embedded systems needing high-speed, low-voltage, secure serial flash - optimized for code execution, firmware updates, and parameter storage in resource-constrained environments.

FAQ

What is the package type and footprint of W25Q40BWZPIG?

W25Q40BWZPIG uses an 8-pad WSON 6×5mm package (code ZP) with exposed thermal pad. Its footprint matches JEDEC MO-241AC standards, requires no solder mask defined pad, and supports reflow per IPC/JEDEC J-STD-020. Pin 1 is marked by a dot or beveled corner; GND (pin 4) and VCC (pin 5) are adjacent for optimal decoupling placement near the device.

Does W25Q40BWZPIG support Quad SPI mode out of the box?

No - W25Q40BWZPIG requires explicit configuration to enable Quad SPI. The non-volatile Quad Enable (QE) bit in Status Register-2 must be set using the Write Status Register instruction (01h). Until QE=1, /WP and /HOLD remain functional as hardware protection pins; setting QE repurposes them as IO2 and IO3, disabling hardware write protection during Quad operation.

How does the /HOLD pin behave in Dual SPI versus Quad SPI mode on W25Q40BWZPIG?

In Standard and Dual SPI modes, /HOLD (pin 7) actively pauses ongoing transactions when pulled low while /CS is asserted, placing DO in high-impedance and ignoring DI/CLK. In Quad SPI mode (QE=1), /HOLD becomes IO3 and loses its hold function - attempting to use it as a control signal will interfere with data transfer. Hold functionality is unavailable during Quad operation.

What is the minimum instruction overhead for random reads on W25Q40BWZPIG?

Using Continuous Read Mode with Fast Read Quad I/O (EBh), W25Q40BWZPIG requires only 8 clock cycles to transmit the 24-bit address after instruction latch - enabling true XIP with sub-100ns effective latency per word. This compares to 16+ clocks for standard Read Data (03h), making EBh optimal for deterministic code execution directly from flash.

Can W25Q40BWZPIG's security registers be reprogrammed after OTP locking?

No - once any of the four 256-byte security registers is locked via its OTP bit (LB0–LB3), that register becomes permanently read-only and cannot be erased or rewritten, even with full chip erase. Unlocking requires factory reset, which is not supported in the field. Initial provisioning must therefore occur before OTP activation, and keys should be written only after validation.