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Winbond Electronics Corporation W25Q40CLSSIG
- Part No.:
- W25Q40CLSSIG
- Manufacturer:
- Winbond Electronics Corporation
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
W25Q40CLSSIG.pdf
- Description:
- IC FLASH 4MBIT SPI/QUAD 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,525
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Product details
Overview
W25Q40CLSSIG from Winbond is a 4 M-bit (512 KB) serial NOR flash memory IC supporting Standard, Dual, and Quad SPI interfaces with uniform 4 KB sectors and up to 104 MHz clock frequency. It operates from 2.3 V to 3.6 V, draws ≤1 mA active current and <1 µA in power-down mode, and is rated for –40°C to +85°C. It enables XIP (execute-in-place) code execution in microcontroller boot applications.
For engineers reviewing the W25Q40CLSSIG datasheet, W25Q40CLSSIG pinout, W25Q40CLSSIG application, or W25Q40CLSSIG equivalent, key selection considerations include Quad SPI enable (QE bit), /WP and /HOLD pin reassignment in Quad mode, sector/block erase granularity (4/32/64 KB), JEDEC ID read capability (9Fh), and USON 2×3-mm or SOIC-8 package compatibility.
Technical Context
The W25Q40CLSSIG implements a SPI-compatible command set with three operational modes: Standard (DI/DO), Dual I/O (IO0/IO1), and Quad I/O (IO0–IO3). Its internal architecture includes a 256-byte page buffer, status register with non-volatile QE bit (SR2 bit 1), and hardware write protection via /WP pin - disabled when QE=1 due to IO2 remapping.
It supports continuous read mode with ≤16-clock instruction overhead for true XIP operation, and features erase/program suspend/resume functionality. The device uses JEDEC-standard manufacturer ID (EFh) and device ID (4013h), plus a unique 64-bit serial number accessible via instruction 4Bh.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 M-bit (512 KB), organized as 2048 × 256-byte pages |
| Operating Voltage | 2.3 V to 3.6 V - compatible with 2.5 V, 3.0 V, and 3.3 V logic systems |
| Max Clock Frequency | 104 MHz - enables 416 Mbps effective throughput in Quad I/O mode |
| Erase Granularity | Uniform 4 KB sectors, 32 KB blocks, and 64 KB blocks - supports fine-grained data logging and firmware partitioning |
| Write Endurance | ≥100,000 program/erase cycles per sector - suitable for frequent firmware updates or parameter storage |
| Data Retention | ≥20 years at +85°C - ensures long-term reliability in industrial and automotive environments |
| Temperature Range | –40°C to +85°C - qualified for extended industrial operation without derating |
Pinout & Package
W25Q40CLSSIG is packaged in an 8-pin SOIC 150-mil (package code SN), with pin 1 marked by a dot or beveled corner. Pin functions are electrically identical across SOIC and USON variants, but physical layout differs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 /CS | Chip Select Input | Active-low enable; must transition high→low after power-up before first instruction |
| 2 DO (IO1) | Data Output / I/O1 | Unidirectional output in Standard SPI; bidirectional I/O in Dual/Quad mode |
| 3 /WP (IO2) | Write Protect Input / I/O2 | Hardware write lock for status register; becomes IO2 when Quad Enable (QE) = 1 |
| 4 GND | Ground Reference | Primary return path for all I/O and core logic; requires low-impedance PCB connection |
| 5 DI (IO0) | Data Input / I/O0 | Unidirectional input in Standard SPI; bidirectional I/O in Dual/Quad mode |
| 6 CLK | Serial Clock Input | Edge-triggered timing source; supports SPI Modes 0 and 3; max 104 MHz |
| 7 /HOLD (IO3) | Hold Input / I/O3 | Pauses ongoing SPI transfer; becomes IO3 when Quad Enable (QE) = 1 |
| 8 VCC | Power Supply | 2.3–3.6 V supply; decoupling capacitor required within 10 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Quad SPI Enable (QE bit) | Non-volatile bit in Status Register-2; enables IO2 (/WP) and IO3 (/HOLD) for 4-line data transfer |
| Continuous Read Mode | ≤16-clock instruction overhead for sequential reads - reduces CPU wait states during XIP execution |
| Erase/Program Suspend | Allows temporary halt of active erase/program to service higher-priority interrupts, then resume from same address |
| 64-bit Unique ID | Factory-programmed serial number readable via instruction 4Bh - enables secure device authentication and traceability |
| JEDEC ID Support | Reads EFh (Winbond) + 4013h (W25Q40CL) via 9Fh instruction - enables automatic flash detection in bootloader software |
Applications
| IoT Edge Node Firmware Storage | Industrial PLC Boot Memory |
|---|---|
|
Use Scenario: Storing MCU boot firmware and field-upgradable application binaries in battery-powered wireless sensors. IC Role / Device Role / Timing Role: Primary non-volatile code storage with Quad SPI XIP support for low-latency startup and over-the-air update staging. Use Value: 4 KB sector granularity allows atomic firmware patching; <1 µA power-down current extends battery life between wake cycles. |
Use Scenario: Holding real-time OS kernel, configuration tables, and diagnostic logs in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Reliable, temperature-stable program memory interfaced to ARM Cortex-M7 via Dual SPI bus. Use Value: –40°C to +85°C rating and 20-year data retention ensure firmware integrity across 15+ year product lifecycles. |
| Medical Device Parameter Logging | Automotive Infotainment Bootloader |
|
Use Scenario: Recording calibration coefficients, usage counters, and error history in Class II medical instruments requiring audit-trail compliance. IC Role / Device Role / Timing Role: Secure, write-protected data archive using hardware /WP pin + status register BP bits. Use Value: One-time-programmable (OTP) security registers (optional) and 64-bit unique ID support regulatory traceability requirements. |
Use Scenario: Hosting signed bootloader images and secure boot keys in head-unit ECUs with ASIL-B functional safety constraints. IC Role / Device Role / Timing Role: Trusted code origin point verified via JEDEC ID and unique serial number before loading application firmware. Use Value: Fast Read Quad I/O (EBh) achieves >300 MB/s effective bandwidth - meets boot time targets under AUTOSAR timing budgets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial NOR flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MX25L4006EM1I-12G | 4 M-bit, 104 MHz max, SOIC-8, but lacks Quad I/O support (Dual SPI only); no /HOLD pin remapping | Lower interface bandwidth limits XIP performance; no suspend/resume feature | Select when Quad SPI is unnecessary and cost sensitivity outweighs future upgrade flexibility |
| S25FL004KAGMFI011 | 4 M-bit, 85 MHz max, USON-8, supports Quad SPI and SFDP, but requires external VIO supply for I/O voltage scaling | Higher pin count (8-pin vs 8-pad) and separate VIO rail increase BOM complexity | Prefer when system already uses Cypress-compatible toolchain and requires SFDP-based auto-configuration |
Compared with W25Q40CLSSIG, MX25L4006EM1I-12G offers simpler control but lower throughput, while S25FL004KAGMFI011 adds SFDP flexibility at the cost of dual-supply design overhead - W25Q40CLSSIG balances Quad SPI performance, single-supply simplicity, and industrial temperature support in compact SOIC-8.
Availability
W25Q40CLSSIG is available at Aetrix Electronics and suitable for IoT edge node firmware storage, industrial PLC boot memory, and medical device parameter logging requiring stable component supply and long-term lifecycle assurance.
Supply support for W25Q40CLSSIG 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 and RAM products for embedded and industrial markets.
The W25Q series was designed specifically for high-reliability code storage and XIP execution in resource-constrained microcontroller systems, emphasizing fast Quad SPI access, robust write protection, and extended temperature operation.
FAQ
What is the maximum clock frequency supported by W25Q40CLSSIG in Quad SPI mode?
W25Q40CLSSIG supports up to 104 MHz on the CLK pin in Quad SPI mode, delivering an effective data rate of 416 Mbps (104 MHz × 4 lines). This is confirmed in the AC Electrical Characteristics section (Table 10.6) of the datasheet, where tV and tVH timing parameters are specified for 104 MHz operation with Quad I/O instructions like EBh.
Does W25Q40CLSSIG support execute-in-place (XIP) operation?
Yes, W25Q40CLSSIG supports true XIP operation via its Continuous Read Mode, which reduces instruction overhead to as few as 16 clocks for addressing - enabling direct code execution from flash without copying to RAM. This is explicitly enabled by Fast Read Quad I/O (EBh) and Fast Read Dual I/O (BBh) instructions, and documented in Section 2. FEATURES and Section 7.1.3.
How does the /WP pin behave when Quad SPI is enabled on W25Q40CLSSIG?
When the Quad Enable (QE) bit in Status Register-2 is set to 1, the /WP pin on W25Q40CLSSIG is remapped as IO2 and loses its hardware write-protect function. This behavior is defined in Section 5.3 and Section 7.1.3 of the datasheet, and means software-based protection (via BP bits and SRP0/SRP1) must be used instead of pin-level locking.
What package type does W25Q40CLSSIG use, and how is it identified?
W25Q40CLSSIG uses an 8-pin SOIC 150-mil package (package code SN), identified by "SSIG" in the part number suffix and confirmed in Section 11.1 of the datasheet. The top-side marking includes "W25Q40CL" plus date code and factory code, and pin 1 is indicated by a dot or beveled corner.
Can W25Q40CLSSIG be used in automotive applications?
W25Q40CLSSIG is rated for –40°C to +85°C operation and meets industrial temperature requirements, but it is not AEC-Q100 qualified. For automotive applications requiring qualification, Winbond offers the AEC-Q100 Grade 3 W25Q40EW variant - W25Q40CLSSIG should be limited to under-hood-adjacent or cabin-infotainment subsystems where full qualification is not mandated.
W25Q40CLSSIG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Winbond Electronics Corporation
- Series:
- SpiFlash®
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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
- Clock Frequency:
- 104 MHz
- Write Cycle Time - Word, Page:
- 800µs
- Access Time:
- -
- Voltage - Supply:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
W25Q40CLSSIG FAQ
1.How can I place an order for W25Q40CLSSIG through Aetrix?
Please submit a Request for Quotation (RFQ) for W25Q40CLSSIG 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 W25Q40CLSSIG reliable?
The price and inventory of W25Q40CLSSIG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for W25Q40CLSSIG is usually 5 days.
3.What payment methods are accepted for W25Q40CLSSIG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for W25Q40CLSSIG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for W25Q40CLSSIG?
W25Q40CLSSIG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your W25Q40CLSSIG 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 W25Q40CLSSIG?
For technical support, including W25Q40CLSSIG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your W25Q40CLSSIG requirements.
6.How does Aetrix verify that W25Q40CLSSIG is sourced from the original manufacturer or authorized distributors?
All W25Q40CLSSIG 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 W25Q40CLSSIG meets industry standards.
7.What is the process for return or replacement of W25Q40CLSSIG?
All W25Q40CLSSIG units undergo pre-shipment inspection (PSI). If there is an issue with W25Q40CLSSIG, 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 W25Q40CLSSIG part is unused and in its original packaging.
Return procedure for W25Q40CLSSIG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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