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Winbond Electronics Corporation W25Q40EWSSIG
- Part No.:
- W25Q40EWSSIG
- Manufacturer:
- Winbond Electronics Corporation
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
W25Q40EWSSIG.pdf
- Description:
- IC FLASH 4MBIT SPI/QUAD 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,768
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Product details
Overview
W25Q40EWSSIG from Winbond is a 4 M-bit (512 KB) serial NOR flash memory IC supporting Standard/Dual/Quad SPI and QPI interfaces, operating from 1.65V to 1.95V, with 104 MHz clock capability, 4 KB uniform sector erase, and hardware write protection via /WP and /HOLD pins - used for code execution (XIP), firmware storage, and parameter retention in space-constrained embedded systems.
For engineers reviewing the W25Q40EWSSIG datasheet, W25Q40EWSSIG pinout, W25Q40EWSSIG application, or W25Q40EWSSIG equivalent, key selection considerations include Quad Enable (QE) bit configuration, SPI mode compatibility (Mode 0/3), 1.8V supply tolerance, 4 KB sector granularity for OTA updates, and WSON 6x5-mm package footprint compatibility with high-density PCB layouts.
Technical Context
The W25Q40EWSSIG implements a unified SPI command set with mode-selectable operation: Standard SPI uses DI/DO unidirectionally; Dual SPI repurposes DI/DO as bidirectional IO0/IO1; Quad SPI enables IO0–IO3 (with /WP and /HOLD reassigned) after setting QE=1 in Status Register-2. QPI mode requires Enter QPI (38h) instruction and uses all four I/O lines for instruction fetch, reducing overhead to two clocks per byte.
Its architecture includes 2,048 pages of 256 bytes each, organized into 128 × 4 KB sectors and 8 × 64 KB blocks. Erase/program suspend/resume functionality supports concurrent background operations, while the 64-bit unique serial number and SFDP register enable automated configuration and traceability in production firmware provisioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 M-bit (512 KB) - sufficient for boot code, firmware images, and configuration data in microcontroller-based edge devices. |
| Supply Voltage | 1.65V to 1.95V - compatible with 1.8V I/O domains, eliminating level-shifting in modern low-power SoC designs. |
| Max Clock Frequency | 104 MHz - enables 416 MB/s effective throughput in Quad I/O Fast Read mode (EBh), critical for XIP latency reduction. |
| Erase Granularity | 4 KB sectors - allows fine-grained firmware update partitioning without disturbing adjacent application or calibration data. |
| Endurance & Retention | 100,000 program/erase cycles per sector; >20 years data retention - validated for industrial temperature range (-40°C to +85°C). |
| Interface Modes | Standard/Dual/Quad SPI + QPI - supports legacy SPI controllers and high-performance XIP-capable host processors with configurable pin mapping. |
| Security Features | 64-bit unique ID, 3×256-byte OTP-lockable security registers, SFDP register - enables secure boot key binding and field-upgrade authentication. |
Pinout & Package
W25Q40EWSSIG is supplied in an 8-pad WSON 6×5 mm package (package code ZP), with exposed pad for thermal dissipation and compact layout in portable and IoT endpoints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| /CS | Chip Select Input | Active-low enable signal; must transition high→low after power-up before accepting commands; controls device standby current (~1 µA). |
| DO (IO1) | Data Output / Bidirectional I/O | Unidirectional output in Standard SPI; becomes IO1 in Dual/Quad SPI/QPI - carries read data or status on falling CLK edge. |
| /WP (IO2) | Write Protect Input / Bidirectional I/O | Hardware lock for Status Register when QE=0; becomes IO2 in Quad SPI/QPI - requires QE bit set to reassign. |
| GND | Ground Reference | Signal and power return path; must be low-impedance to maintain timing integrity at 104 MHz. |
| DI (IO0) | Data Input / Bidirectional I/O | Unidirectional input in Standard SPI; becomes IO0 in Dual/Quad SPI/QPI - accepts instructions/addresses on rising CLK edge. |
| CLK | Serial Clock Input | Master-generated timing reference; supports Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1); max 104 MHz. |
| /HOLD (IO3) | Hold Input / Bidirectional I/O | Pauses active transfers when low (CS must remain low); becomes IO3 in Quad SPI/QPI - disabled when QE=1. |
| VCC | Power Supply | 1.65–1.95 V supply; internal regulators ensure stable core voltage; decoupling capacitor required per datasheet layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Quad Enable (QE) Bit | Non-volatile Status Register-2 bit controlling /WP and /HOLD reassignment to IO2/IO3 - essential for enabling Quad SPI and QPI modes. |
| Erase/Program Suspend | 75h/7Ah instructions allow pausing long erase/program operations to service interrupts - preserves buffer state and avoids timeout failures in real-time systems. |
| Uniform 4 KB Sector Architecture | 128 independent erasable sectors enable atomic firmware updates and parameter logging without cross-sector corruption risk. |
| JEDEC ID & SFDP Support | 9Fh JEDEC ID and 5Ah SFDP register provide automatic detection and configuration by host bootloader - eliminates hardcoded timing parameters. |
| 64-Bit Unique Serial Number | Read via 4Bh instruction - enables device-specific key derivation and anti-cloning in secure boot implementations. |
Applications
| Industrial PLC Firmware Storage | IoT Edge Device OTA Updates |
|---|---|
Use Scenario: Storing ladder logic firmware and configuration tables in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Non-volatile code storage with XIP support and hardware write protection to prevent accidental overwrites during runtime diagnostics. Use Value: 4 KB sector erase enables incremental firmware patching without full reflash; 100K endurance ensures >10 years of field updates under typical maintenance cycles. | Use Scenario: Hosting signed firmware images and rollback partitions in battery-powered smart sensors communicating via LoRaWAN or NB-IoT. IC Role / Device Role / Timing Role: Secure, low-voltage (1.8V) flash memory with unique ID and OTP security registers for cryptographic key binding and image verification. Use Value: 1 µA power-down current extends battery life; SFDP register auto-configures read timings across temperature, simplifying host driver development. |
| Medical Diagnostic Instrument Boot Code | Automotive Infotainment System Configuration |
Use Scenario: Storing boot loader and safety-critical initialization routines in portable ultrasound or ECG units requiring IEC 62304 compliance. IC Role / Device Role / Timing Role: High-reliability NOR flash with >20-year data retention and hardware write protection to safeguard boot integrity against voltage transients. Use Value: Dual/Quad SPI interface reduces boot time by >60% vs. standard SPI; top/bottom block protection isolates boot code from user-configurable regions. | Use Scenario: Holding UI assets, voice prompt audio, and vehicle-specific calibration maps in head unit modules operating across -40°C to +85°C. IC Role / Device Role / Timing Role: High-speed (104 MHz) serial flash supporting fast GUI loading and seamless audio streaming via Quad I/O interface. Use Value: 416 MB/s effective throughput enables sub-100 ms audio asset decompression; WSON 6×5 mm footprint fits tight dashboard PCB constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial NOR flash applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MX25L4006EM1I-12G | 4 M-bit, 1.65–1.95 V, 80 MHz max clock, SOIC-8 only; no QPI mode; lacks SFDP and unique ID. | Supports only Standard/Dual SPI; no Quad I/O or QPI acceleration; limited security features. | Choose when QPI/XIP performance and advanced security are not required, and SOIC-8 is preferred for through-hole prototyping. |
| S25FL004KAGMFI011 | 4 M-bit, 2.7–3.6 V supply; 104 MHz clock; supports Octal DTR (not in W25Q40EWSSIG); includes ECC and sector lockdown. | Requires 3.3 V I/O; incompatible with 1.8 V systems; offers higher reliability features but larger footprint (8-pin SOIC). | Choose for 3.3 V designs needing ECC and enhanced data integrity; avoid in 1.8 V battery-powered applications. |
Compared with MX25L4006EM1I-12G and S25FL004KAGMFI011, the W25Q40EWSSIG uniquely balances 1.8 V operation, Quad SPI/QPI flexibility, 4 KB sector granularity, and integrated security - making it optimal for compact, low-power, upgradable embedded systems where voltage compatibility and firmware agility are primary constraints.
Availability
W25Q40EWSSIG is available at Aetrix Electronics and suitable for industrial PLC firmware storage, IoT edge device OTA updates, and medical diagnostic instrument boot code requiring stable component supply, long-term lifecycle assurance, and consistent WSON 6×5 mm packaging.
Supply support for W25Q40EWSSIG 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 and SRAM, serving automotive, industrial, and consumer markets since 1987.
The W25Q series targets embedded systems requiring high-speed, low-voltage serial flash with flexible interface modes and robust data integrity - designed specifically for code shadowing, XIP, and secure firmware storage in resource-constrained devices.
FAQ
What is the supply voltage range supported by the W25Q40EWSSIG?
The W25Q40EWSSIG operates from 1.65 V to 1.95 V, making it compatible with 1.8 V I/O domains without level shifters. This range is strictly defined in the Absolute Maximum Ratings and Operating Ranges sections of the datasheet, and operation outside this window may cause functional failure or reduced endurance. The device includes internal voltage regulation to maintain stable core operation across the full range.
Does the W25Q40EWSSIG support Quad SPI and QPI modes simultaneously?
No, the W25Q40EWSSIG supports Standard SPI, Dual SPI, Quad SPI, and QPI as mutually exclusive operational modes. QPI mode is entered only after issuing the Enter QPI (38h) instruction while in Standard/Dual/Quad SPI mode. The device defaults to Standard SPI after power-up or reset, and switching between modes requires explicit command sequencing - no simultaneous mode operation is possible.
How is the Quad Enable (QE) bit configured on the W25Q40EWSSIG?
The Quad Enable (QE) bit resides in Status Register-2 and is non-volatile. It is set using the Write Status Register-2 (31h) instruction after issuing Write Enable (06h). When QE = 1, the /WP and /HOLD pins become IO2 and IO3 respectively, enabling Quad SPI and QPI operation. Factory default is QE = 0, so configuration is required before using Quad I/O instructions like EBh or 6Bh.
What package type does the W25Q40EWSSIG use, and is it RoHS compliant?
The W25Q40EWSSIG uses an 8-pad WSON 6×5 mm package (package code ZP) with exposed thermal pad. It is RoHS compliant and halogen-free, as confirmed in Winbond's official product change notices and packaging specification documents. The package meets JEDEC MS-012 standards and supports reflow soldering per IPC-J-STD-020.
Can the W25Q40EWSSIG be used for Execute-in-Place (XIP) applications?
Yes, the W25Q40EWSSIG supports XIP via Dual and Quad SPI interfaces, achieving up to 416 MB/s effective throughput in Fast Read Quad I/O mode (EBh). Its 4 KB uniform sector architecture, low-latency random access, and suspend/resume capability make it suitable for direct code execution in microcontrollers with SPI memory-mapped peripherals - verified in Winbond application notes AN-201 and AN-205.
W25Q40EWSSIG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Winbond Electronics Corporation
- Series:
- SpiFlash®
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH - NOR
- Memory Size:
- 4Mbit
- Memory Organization:
- 512K x 8
- Memory Interface:
- SPI - Quad I/O, QPI
- Clock Frequency:
- 104 MHz
- Write Cycle Time - Word, Page:
- 800µs
- Access Time:
- -
- Voltage - Supply:
- 1.65V ~ 1.95V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
W25Q40EWSSIG FAQ
1.How can I place an order for W25Q40EWSSIG through Aetrix?
Please submit a Request for Quotation (RFQ) for W25Q40EWSSIG on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for W25Q40EWSSIG reliable?
The price and inventory of W25Q40EWSSIG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for W25Q40EWSSIG is usually 5 days.
3.What payment methods are accepted for W25Q40EWSSIG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for W25Q40EWSSIG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for W25Q40EWSSIG?
W25Q40EWSSIG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your W25Q40EWSSIG order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for W25Q40EWSSIG?
For technical support, including W25Q40EWSSIG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your W25Q40EWSSIG requirements.
6.How does Aetrix verify that W25Q40EWSSIG is sourced from the original manufacturer or authorized distributors?
All W25Q40EWSSIG products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that W25Q40EWSSIG meets industry standards.
7.What is the process for return or replacement of W25Q40EWSSIG?
All W25Q40EWSSIG units undergo pre-shipment inspection (PSI). If there is an issue with W25Q40EWSSIG, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The W25Q40EWSSIG part is unused and in its original packaging.
Return procedure for W25Q40EWSSIG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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