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Winbond Electronics Corporation W25X40CLDAIG TR
- Part No.:
- W25X40CLDAIG TR
- Manufacturer:
- Winbond Electronics Corporation
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
W25X40CLDAIG TR.pdf
- Description:
- IC FLASH 4MBIT SPI 104MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,775
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Product details
Overview
W25X40CLDAIG TR from Winbond is a 4 M-bit (512 KB) serial flash memory IC designed for embedded code storage and data logging in space-constrained systems. It supports standard SPI, dual-output SPI, and dual I/O SPI interfaces; operates from 2.3 V to 3.6 V; delivers up to 208 Mbps effective throughput via Fast Read Dual I/O (BBh); and features uniform 4 KB sectors, 32 KB blocks, and 64 KB blocks for flexible erase granularity. It is commonly used in microcontroller boot code storage and firmware update storage.
For engineers reviewing the W25X40CLDAIG TR datasheet, W25X40CLDAIG TR pinout, W25X40CLDAIG TR application, or W25X40CLDAIG TR equivalent, key selection considerations include its 8-pin SOIC 150-mil (SN) package, 104 MHz max SPI clock, hardware /WP and /HOLD control, JEDEC-compliant ID support (9Fh), and 4 KB sector architecture enabling fine-grained parameter retention.
Technical Context
The W25X40CLDAIG TR implements a SPI-compatible command set with volatile write-enable latching (WEL), non-volatile status register protection (SRP), and top/bottom block protect (TB) logic. Its dual I/O mode uses bidirectional IO0/IO1 pins under BBh instruction, doubling data rate versus standard SPI while maintaining single-clock-edge sampling.
Internally, it organizes 2048 × 256-byte pages into 128 × 4 KB sectors, 16 × 32 KB blocks, and 8 × 64 KB blocks - all erasable independently. The status register (S7–S0) provides real-time BUSY flag, WEL state, BP2–BP0 protection bits, TB direction control, and SRP hardware lock, enabling robust, layered write protection without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 M-bit (512 KB), organized as 2048 pages × 256 bytes - enables full MCU firmware image storage in compact footprint. |
| Sector Architecture | 128 uniform 4 KB sectors - allows independent parameter storage and firmware patching without disturbing adjacent code/data. |
| Max SPI Clock | 104 MHz - supports 208 Mbps effective read rate using Fast Read Dual I/O (BBh), matching parallel flash performance. |
| Supply Voltage | 2.3 V to 3.6 V - compatible with 3.3 V and mixed-voltage embedded systems; no level-shifting required. |
| Active/Power-down Current | 1 mA active, <1 µA power-down - extends battery life in portable and low-power IoT endpoints. |
| Data Retention | 20+ years - ensures long-term reliability for industrial firmware and calibration data storage. |
| Erase/Write Cycles | 100,000 minimum - supports frequent field updates in OTA-capable devices. |
Pinout & Package
W25X40CLDAIG TR is packaged in an 8-pin SOIC 150-mil (package code SN), with gull-wing leads, 1.27 mm pitch, and RoHS-compliant matte tin finish. Dimensions: 5.0 × 4.0 × 1.5 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 /CS | Chip Select Input | Active-low enable; must transition high→low after power-up before first instruction; controls device selection on shared SPI bus. |
| 2 DO (IO1) | Serial Data Output / Dual I/O | Output-only in standard SPI; bidirectional I/O1 in Dual SPI modes (3Bh/BBh); high-impedance when /CS high or /HOLD active. |
| 3 /WP | Hardware Write Protect Input | Active-low pin that, when asserted with SRP=1, locks status register writes - prevents accidental configuration changes during operation. |
| 4 GND | Ground Reference | Primary return path for VCC and I/O signals; requires low-impedance PCB connection to minimize noise coupling into SPI timing. |
| 5 DI (IO0) | Serial Data Input / Dual I/O | Input-only in standard SPI; bidirectional I/O0 in Dual SPI modes; carries instructions, addresses, and data on rising CLK edge. |
| 6 CLK | Serial Clock Input | Master-generated clock; supports SPI Modes 0 and 3; timing-critical path requiring controlled impedance routing. |
| 7 /HOLD | Operation Hold Input | Pauses ongoing SPI transfer (e.g., mid-page-program) without resetting internal state - essential for multi-device SPI arbitration. |
| 8 VCC | Power Supply | 2.3–3.6 V supply; requires local 100 nF ceramic decoupling within 5 mm of pin to suppress switching noise during fast reads/writes. |
Key Features
| Feature | Design Value |
|---|---|
| Continuous Read Mode | Reduces instruction overhead to ≤16 clocks per 24-bit address access - enables true XIP (execute-in-place) for ARM Cortex-M boot code. |
| Dual I/O SPI Interface | Supports BBh instruction for simultaneous 2-bit data transfer on IO0/IO1 - doubles bandwidth over standard SPI without added pins or controller complexity. |
| Hardware + Software Write Protection | Combines /WP pin, SRP bit, and BP2–BP0/TB register bits to protect any 4 KB sector or contiguous region - eliminates need for external protection logic. |
| JEDEC Standard Identification | Returns Manufacturer ID EFh, Device ID 12h (9Fh command), and unique 64-bit serial number - simplifies automated BOM verification and counterfeit detection. |
| Low-Power Power-down Mode | Enters <1 µA standby with B9h instruction - ideal for battery-powered sensors that wake periodically to log data to flash. |
Applications
| MCU Boot Code Storage | Firmware Over-the-Air (OTA) Update Storage |
|---|---|
|
Use Scenario: Storing primary bootloader and application firmware for ARM Cortex-M or RISC-V microcontrollers in resource-limited edge nodes. IC Role / Device Role / Timing Role: Non-volatile code storage accessed at power-on reset via XIP-capable SPI interface; supports continuous read mode for zero-wait-state execution. Use Value: Eliminates external NOR flash or parallel memory; reduces PCB area and BOM count while maintaining deterministic boot timing. |
Use Scenario: Holding validated firmware images during staged OTA updates in smart meters, gateways, and industrial controllers. IC Role / Device Role / Timing Role: Dual-bank storage partitioning (e.g., active/inactive banks) managed by host MCU; leverages 4 KB sector erase for atomic image swap. Use Value: Enables fail-safe rollback and atomic update commit using hardware sector protection - no risk of partial writes corrupting operational firmware. |
| Calibration & Configuration Data Logging | Audio/Text Asset Storage |
|
Use Scenario: Recording sensor calibration coefficients, user preferences, and runtime parameters in medical devices and test equipment. IC Role / Device Role / Timing Role: Parameter storage with individual 4 KB sector write/erase control; accessed via standard SPI during initialization or maintenance mode. Use Value: Guarantees data integrity across 100,000+ cycles and 20-year retention - critical for regulatory compliance in Class II medical electronics. |
Use Scenario: Storing voice prompts, UI text strings, and localized assets in consumer audio products and human-machine interfaces. IC Role / Device Role / Timing Role: High-throughput sequential read source for audio playback or GUI rendering; utilizes Fast Read Dual Output (3Bh) for burst streaming. Use Value: Delivers 208 Mbps read bandwidth - sufficient for uncompressed mono PCM audio playback without buffering bottlenecks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| W25Q40EWDAIG TR | Successor generation: Quad I/O support (QPI), 133 MHz clock, 4 KB sectors retained, but adds 4-byte addressing mode and enhanced security registers. | Required for designs needing >16 MB addressing headroom or hardware encryption key storage; not drop-in due to QPI command set differences. | Select W25Q40EWDAIG TR only if future scalability to larger densities or secure boot features is mandated; W25X40CLDAIG TR remains optimal for cost-sensitive, fixed-function 4 MB use cases. |
| AT25DF041A-SSH-T | Same density (4 M-bit), SOIC-8 package, but supports only standard and dual-output SPI (no dual I/O), max clock 85 MHz, and lacks Continuous Read Mode. | Suitable for legacy SPI controllers without dual I/O capability; lower bandwidth limits XIP feasibility and audio streaming performance. | Choose AT25DF041A-SSH-T only when pinout compatibility is required and dual I/O functionality is unused; W25X40CLDAIG TR delivers superior throughput and flexibility where supported. |
Compared with W25Q40EWDAIG TR, the W25X40CLDAIG TR offers simpler command set and lower cost for fixed 4 MB needs, while AT25DF041A-SSH-T trades bandwidth and XIP capability for broader legacy controller compatibility - making W25X40CLDAIG TR the balanced choice for new designs prioritizing speed, sector flexibility, and proven integration.
Availability
W25X40CLDAIG TR is available at Aetrix Electronics and suitable for MCU boot code storage, firmware OTA update storage, and calibration data logging requiring stable component supply across industrial, automotive, and consumer production programs.
Supply support for W25X40CLDAIG 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 company specializing in specialty DRAM, serial flash, and mobile RAM solutions for embedded and communications markets.
The W25X series was engineered specifically for cost-sensitive, space-constrained embedded systems requiring reliable code and data storage with SPI simplicity and enhanced throughput - targeting microcontroller-based IoT endpoints, industrial HMI, and consumer electronics.
FAQ
What is the maximum SPI clock frequency supported by the W25X40CLDAIG TR?
The W25X40CLDAIG TR supports a maximum SPI clock frequency of 104 MHz in standard and dual-output modes. When using the Fast Read Dual I/O (BBh) instruction, the effective data rate reaches 208 Mbps due to simultaneous 2-bit transfers on IO0 and IO1. This timing is validated across the full operating temperature range (−40°C to +85°C) and supply voltage (2.3 V to 3.6 V). The W25X40CLDAIG TR datasheet specifies tV and tVH timing margins to ensure robust setup/hold compliance at this rate.
Does the W25X40CLDAIG TR support execute-in-place (XIP) operation?
Yes, the W25X40CLDAIG TR supports true XIP operation via its Continuous Read Mode, which reduces instruction overhead to as few as 16 clock cycles for a 24-bit address access. This enables direct code execution from flash without copying to RAM, reducing boot time and SRAM usage in Cortex-M and other embedded MCUs. The W25X40CLDAIG TR achieves this through optimized internal address latching and pipeline design, confirmed in Section 7.1.3 and Figure 13 of the official datasheet.
How many erase/write cycles does the W25X40CLDAIG TR guarantee?
The W25X40CLDAIG TR guarantees a minimum of 100,000 program/erase cycles per sector, as specified in the "Features" section and verified under JEDEC JESD22-A117 stress conditions. This endurance applies uniformly across all 4 KB sectors, 32 KB blocks, and 64 KB blocks. Endurance is maintained across the full operating temperature and voltage range, and the W25X40CLDAIG TR includes automatic write-disable and status register protection to prevent inadvertent cycling during system noise events.
What package type does the W25X40CLDAIG TR use, and is it RoHS compliant?
The W25X40CLDAIG TR uses an 8-pin SOIC 150-mil package (package code SN), measuring 5.0 × 4.0 × 1.5 mm with gull-wing leads and 1.27 mm pitch. It is RoHS compliant and lead-free, with matte tin surface finish per JEDEC J-STD-609. The "G" suffix in the part number explicitly denotes green (halogen-free) compliance, and the "TR" indicates tape-and-reel packaging for automated assembly. This package is pin-compatible with other W25X-series SOIC variants but differs from VSOP, WSON, or PDIP versions.
Can the W25X40CLDAIG TR be used with SPI Mode 3 (CPOL=1, CPHA=1)?
Yes, the W25X40CLDAIG TR fully supports both SPI Mode 0 (CPOL=0, CPHA=0) and SPI Mode 3 (CPOL=1, CPHA=1), as documented in Section 7.1.1 of the datasheet. In Mode 3, the serial clock (CLK) idles high, and data is sampled on the falling edge - a requirement for certain legacy microcontrollers and FPGAs. The W25X40CLDAIG TR's input buffers and timing specifications (tSU, tH) are validated for both modes across voltage and temperature, ensuring interoperability without external level shifting.
W25X40CLDAIG TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Winbond Electronics Corporation
- Series:
- SpiFlash®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 4Mbit
- Memory Organization:
- 512K x 8
- Memory Interface:
- SPI
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
W25X40CLDAIG TR FAQ
1.How can I place an order for W25X40CLDAIG TR through Aetrix?
Please submit a Request for Quotation (RFQ) for W25X40CLDAIG 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 W25X40CLDAIG TR reliable?
The price and inventory of W25X40CLDAIG TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for W25X40CLDAIG TR is usually 5 days.
3.What payment methods are accepted for W25X40CLDAIG TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for W25X40CLDAIG TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for W25X40CLDAIG TR?
W25X40CLDAIG TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your W25X40CLDAIG 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 W25X40CLDAIG TR?
For technical support, including W25X40CLDAIG TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your W25X40CLDAIG TR requirements.
6.How does Aetrix verify that W25X40CLDAIG TR is sourced from the original manufacturer or authorized distributors?
All W25X40CLDAIG 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 W25X40CLDAIG TR meets industry standards.
7.What is the process for return or replacement of W25X40CLDAIG TR?
All W25X40CLDAIG TR units undergo pre-shipment inspection (PSI). If there is an issue with W25X40CLDAIG 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 W25X40CLDAIG TR part is unused and in its original packaging.
Return procedure for W25X40CLDAIG TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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