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Winbond Electronics Corporation W25Q40CLSSIG TR
- Part No.:
- W25Q40CLSSIG TR
- Manufacturer:
- Winbond Electronics Corporation
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
W25Q40CLSSIG TR.pdf
- Description:
- IC FLASH 4MBIT SPI/QUAD 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,363
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Product details
Overview
W25Q40CLSSIG TR 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, delivers up to 416 Mbps effective data rate via Quad I/O at 104 MHz CLK, and supports Execute-in-Place (XIP) for code storage in microcontroller boot applications.
For engineers reviewing the W25Q40CLSSIG TR datasheet, W25Q40CLSSIG TR pinout, W25Q40CLSSIG TR application, or W25Q40CLSSIG TR equivalent, key selection considerations include Quad SPI enable (QE bit), /WP and /HOLD dual-role pin behavior in Quad mode, sector-level hardware/software write protection, and USON 2×3-mm or SOIC-8 package compatibility with space-constrained embedded designs.
Technical Context
The W25Q40CLSSIG TR implements a SPI-compatible command set with three operational modes: Standard (DI/DO), Dual I/O (IO0/IO1), and Quad I/O (IO0–IO3), where /WP and /HOLD become IO2 and IO3 only after setting the non-volatile Quad Enable (QE) bit in Status Register-2. Its architecture includes a 256-byte page buffer, erase suspend/resume capability, and JEDEC-standard 64-bit unique ID.
Write protection combines volatile/non-volatile status register bits (BP2–BP0, TB, SEC, SRP0/SRP1) with hardware pins (/WP active-low, functional only in Standard/Dual mode) and power-down instruction lock. The device supports continuous read mode with ≤16-clock address overhead, enabling true XIP operation without external buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 M-bit (512 KB), organized as 2048 pages × 256 bytes; enables compact firmware storage with fine-grained 4 KB sector erasure. |
| SPI Interface Modes | Standard (DI/DO), Dual I/O (IO0/IO1), Quad I/O (IO0–IO3); requires QE=1 for Quad mode, repurposing /WP and /HOLD as IO2/IO3. |
| Max Clock Frequency | 104 MHz CLK; yields 208 Mbps (Dual) or 416 Mbps (Quad) effective throughput-sufficient for real-time code shadowing or XIP execution. |
| Erase Granularity | Uniform 4 KB sectors, 32 KB blocks, 64 KB blocks; allows selective firmware update without full chip erase. |
| Endurance & Retention | ≥100,000 program/erase cycles; ≥20-year data retention at +85°C; ensures long-term reliability in industrial firmware storage. |
| Supply Voltage | 2.3 V to 3.6 V single supply; compatible with 3.3 V logic systems and low-power MCU host interfaces. |
| Operating Temperature | −40°C to +85°C; qualified for extended industrial environments without derating. |
Pinout & Package
W25Q40CLSSIG TR is packaged in an 8-pad USON 2×3-mm (package code UX), surface-mount, lead-free, RoHS-compliant package with wettable flanks for automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| /CS | Chip Select Input | Active-low enable; must transition high→low after power-up before accepting instructions; controls DO high-impedance state when deselected. |
| IO1 (DO) | Bidirectional Data I/O 1 | Serial data output in Standard SPI; bidirectional in Dual/Quad modes; used for read data, status, and JEDEC ID retrieval. |
| IO2 (/WP) | Bidirectional Data I/O 2 / Write Protect | Hardware write protect input (active-low) in Standard/Dual mode; becomes IO2 in Quad mode when QE=1; cannot protect status register if SRP0=0. |
| GND | Ground Reference | Primary return path for VCC and all I/O signals; requires low-impedance PCB connection to minimize noise coupling during fast SPI transfers. |
| IO0 (DI) | Bidirectional Data I/O 0 | Serial data input in Standard SPI; bidirectional in Dual/Quad modes; carries instructions, addresses, and program data on rising CLK edge. |
| CLK | Serial Clock Input | Master-generated timing signal; supports SPI modes 0 and 3; max 104 MHz; timing-critical for setup/hold compliance in high-speed Quad reads. |
| IO3 (/HOLD) | Bidirectional Data I/O 3 / Hold Input | Pauses ongoing SPI transaction when active-low in Standard/Dual mode; becomes IO3 in Quad mode when QE=1; not available during Quad operation. |
| VCC | Power Supply | 2.3–3.6 V supply; requires local 100 nF ceramic decoupling near pad; internal voltage regulators support stable core operation across voltage range. |
Key Features
| Feature | Design Value |
|---|---|
| Quad SPI with QE bit control | Non-volatile QE bit in Status Register-2 enables IO2/IO3 functionality; eliminates need for external multiplexing in high-throughput XIP designs. |
| Continuous Read Mode | ≤16-clock instruction overhead per 24-bit address access; enables deterministic latency for real-time code execution directly from flash. |
| Erase/Program Suspend & Resume | Allows interruption of long erase/program operations (e.g., 400 ms sector erase) to service higher-priority host tasks, then resume without data loss. |
| Hardware + Software Write Protection | Combines /WP pin control with BP2–BP0, TB, SEC, and SRP0/SRP1 bits to protect as little as one 4 KB sector or entire array-critical for bootloader integrity. |
| 64-bit Unique Serial Number | Jedec-standard unique ID accessible via Read Unique ID (4Bh) instruction; enables secure device authentication and firmware binding in production systems. |
Applications
| Firmware Storage | Boot Code Execution |
|---|---|
|
Use Scenario: Storing MCU application firmware, configuration tables, and calibration data in resource-constrained IoT edge nodes. IC Role / Device Role / Timing Role: Non-volatile code and data storage with 4 KB sector granularity for over-the-air (OTA) partial updates. Use Value: Enables field-upgradable firmware without full chip reprogramming; 100K+ endurance supports frequent OTA cycles in deployed devices. |
Use Scenario: Hosting boot code for ARM Cortex-M or RISC-V microcontrollers requiring immediate execution after reset. IC Role / Device Role / Timing Role: Execute-in-Place (XIP) memory source for primary bootloader, eliminating RAM copy latency and size constraints. Use Value: Reduces boot time by >30% vs. parallel flash; 416 Mbps Quad I/O bandwidth sustains CPU fetch rates up to 104 MHz clock frequency. |
| Industrial HMI Display | Medical Sensor Calibration |
|
Use Scenario: Storing GUI assets (fonts, icons, bitmaps) and localized language strings in panel-mounted HMIs with limited PCB area. IC Role / Device Role / Timing Role: High-density, low-pin-count graphics resource storage interfaced via SPI to display controller ASICs. Use Value: USON 2×3-mm footprint saves >60% board space vs. SOIC-8; 2.3–3.6 V operation matches wide-input industrial power rails. |
Use Scenario: Retaining factory-calibrated sensor coefficients and patient-specific settings in portable diagnostic equipment. IC Role / Device Role / Timing Role: Tamper-resistant parameter storage with hardware write protection to prevent accidental overwrite during field servicing. Use Value: /WP pin + BP2–BP0 bits lock critical calibration sectors; 20-year data retention ensures accuracy over product lifetime without battery backup. |
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 CLK, SOIC-8 only; lacks USON option and Quad I/O continuous read mode optimization. | Supports Standard/Dual SPI but no Quad I/O; lower effective throughput (208 Mbps max) limits XIP performance in high-CPU-load scenarios. | Select when USON packaging is unnecessary and Quad I/O is not required; verify /WP and /HOLD pin behavior aligns with existing layout. |
| S25FL004K0XMFI010 | 4 M-bit, 85 MHz max CLK, supports Quad SPI and SFDP; includes configurable dummy cycle support for legacy controllers. | Slower max clock reduces peak bandwidth to ~340 Mbps; SFDP enables automatic controller configuration but adds initialization complexity. | Prefer when interoperability with Cypress/Spansion-based toolchains or SFDP-aware bootloaders is mandatory; confirm timing margins at 85 MHz. |
Compared with MX25L4006EM1I-12G and S25FL004K0XMFI010, the W25Q40CLSSIG TR delivers superior Quad I/O throughput (416 Mbps), smaller USON 2×3-mm footprint, and optimized continuous read mode for deterministic XIP-making it optimal for space- and performance-critical embedded firmware storage.
Availability
W25Q40CLSSIG TR is available at Aetrix Electronics and suitable for industrial HMI displays, medical sensor calibration modules, and automotive body control units requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for W25Q40CLSSIG 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 manufacturer specializing in specialty DRAM, mobile DRAM, and serial flash memory solutions for embedded, industrial, and communications markets.
The W25Q series-including W25Q40CLSSIG TR-is designed specifically for high-reliability, low-pin-count firmware and code storage in microcontroller-based systems requiring fast, flexible, and secure non-volatile memory.
FAQ
What is the package type and footprint of the W25Q40CLSSIG TR?
The W25Q40CLSSIG TR uses an 8-pad USON 2×3-mm package (package code UX) with wettable flanks, RoHS-compliant and halogen-free. Its compact footprint measures 2.0 mm × 3.0 mm × 0.55 mm height, making it ideal for space-constrained PCB layouts in portable and industrial electronics where SOIC-8 is too large.
Does the W25Q40CLSSIG TR support Quad SPI, and how is it enabled?
Yes, the W25Q40CLSSIG TR supports Quad SPI via Fast Read Quad I/O (EBh) and Fast Read Quad Output (6Bh) instructions. Quad mode is enabled by setting the non-volatile Quad Enable (QE) bit in Status Register-2 using the Write Status Register (01h) instruction. Once QE=1, /WP and /HOLD become IO2 and IO3, respectively.
How does hardware write protection work on the W25Q40CLSSIG TR?
Hardware write protection on the W25Q40CLSSIG TR is implemented via the active-low /WP pin, which prevents Status Register writes when asserted-provided SRP0=0. This works alongside software-controlled Block Protect (BP2–BP0) and Top/Bottom (TB) bits to lock sectors as small as 4 KB. /WP is only functional in Standard and Dual SPI modes, not Quad.
What is the maximum clock frequency and corresponding data rate for the W25Q40CLSSIG TR?
The W25Q40CLSSIG TR supports a maximum serial clock (CLK) frequency of 104 MHz. In Quad I/O mode, this yields an effective data rate of 416 Mbps (104 MHz × 4 bits/cycle). In Dual I/O mode, it achieves 208 Mbps. These rates are validated under specified AC electrical conditions and require proper PCB layout for signal integrity.
Can the W25Q40CLSSIG TR be used for Execute-in-Place (XIP) applications?
Yes, the W25Q40CLSSIG TR supports true XIP via its Continuous Read Mode, which reduces instruction overhead to as few as 16 clocks per 24-bit address access. Combined with Quad I/O throughput up to 416 Mbps, it enables deterministic code execution directly from flash-eliminating RAM copy delays in bootloaders and real-time firmware.
W25Q40CLSSIG TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Winbond Electronics Corporation
- Series:
- SpiFlash®
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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 TR FAQ
1.How can I place an order for W25Q40CLSSIG TR through Aetrix?
Please submit a Request for Quotation (RFQ) for W25Q40CLSSIG TR 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 TR reliable?
The price and inventory of W25Q40CLSSIG TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for W25Q40CLSSIG TR is usually 5 days.
3.What payment methods are accepted for W25Q40CLSSIG TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for W25Q40CLSSIG TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for W25Q40CLSSIG TR?
W25Q40CLSSIG TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your W25Q40CLSSIG TR 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 TR?
For technical support, including W25Q40CLSSIG TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your W25Q40CLSSIG TR requirements.
6.How does Aetrix verify that W25Q40CLSSIG TR is sourced from the original manufacturer or authorized distributors?
All W25Q40CLSSIG TR 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 TR meets industry standards.
7.What is the process for return or replacement of W25Q40CLSSIG TR?
All W25Q40CLSSIG TR units undergo pre-shipment inspection (PSI). If there is an issue with W25Q40CLSSIG TR, 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 TR part is unused and in its original packaging.
Return procedure for W25Q40CLSSIG TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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