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Winbond Electronics Corporation W25X40CLDAIG
- Part No.:
- W25X40CLDAIG
- Manufacturer:
- Winbond Electronics Corporation
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
W25X40CLDAIG.pdf
- Description:
- IC FLASH 4MBIT SPI 104MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,921
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Product details
Overview
W25X40CLDAIG 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 with >100,000 erase/write cycles and 20-year data retention.
For engineers reviewing the W25X40CLDAIG datasheet, W25X40CLDAIG pinout, W25X40CLDAIG application, or W25X40CLDAIG equivalent, key selection considerations include its 8-pin SOIC 300-mil (DA package) footprint, hardware write protection via /WP and /HOLD pins, JEDEC-compliant identification (Manufacturer ID EFh, Device ID 12h), and support for true execute-in-place (XIP) operation via Continuous Read Mode with ≤16-clock instruction overhead.
Technical Context
The W25X40CLDAIG implements a SPI-compatible command interface with Mode 0 and Mode 3 clock polarity support, enabling interoperability with diverse microcontroller SPI peripherals. Its internal architecture includes a 256-byte page buffer, status register with non-volatile BP2–BP0, TB, and SRP bits, and high-voltage generators for erase/program operations without external voltage pumps.
Dual I/O SPI mode uses bidirectional IO0 and IO1 pins for simultaneous read/write signaling on both clock edges, achieving 104 MHz clock frequency and 208 Mbps effective bandwidth. The device supports full array protection granularity down to 4 KB sectors via software- and hardware-controlled write lock mechanisms, including /WP pin assertion and Status Register Protect (SRP) bit configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 M-bit (512 KB), organized as 2048 × 256-byte pages |
| Supply Voltage | 2.3 V to 3.6 V - enables direct interfacing with 3.3 V and mixed-voltage MCU systems |
| Max Clock Frequency | 104 MHz - supports high-speed boot code loading and real-time firmware updates |
| Erase Granularity | 4 KB sectors, 32 KB blocks, 64 KB blocks - allows fine-grained parameter storage and coarse firmware partitioning |
| Write Endurance | >100,000 cycles - suitable for frequent configuration or logging use cases |
| Data Retention | >20 years at +85°C - ensures long-term reliability in industrial and automotive environments |
| Operating Temp | −40°C to +85°C - qualified for extended temperature industrial applications |
| Active Current | 1 mA typical - minimizes power budget impact in battery-backed or low-power systems |
Pinout & Package
W25X40CLDAIG is packaged in an 8-pin PDIP 300-mil (package code DA), with lead spacing and thermal profile compatible with through-hole reflow and wave soldering processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 /CS | Chip Select Input | Active-low enable signal; places DO in high-impedance state when deasserted, reducing bus contention |
| 2 DO (IO1) | Serial Data Output / Dual I/O | Unidirectional output in standard SPI; bidirectional I/O in Dual SPI modes (3Bh/BBh) |
| 3 /WP | Hardware Write Protect Input | Active-low pin that locks Status Register writes when SRP = 1, enabling tamper-resistant configuration storage |
| 4 GND | Ground Reference | Primary return path for VCC and all I/O signals; requires low-impedance PCB connection |
| 5 DI (IO0) | Serial Data Input / Dual I/O | Unidirectional input in standard SPI; bidirectional I/O in Dual SPI modes (3Bh/BBh) |
| 6 CLK | Serial Clock Input | Edge-triggered timing reference supporting Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1) |
| 7 /HOLD | Operation Pause Control | Active-low signal that suspends ongoing SPI transfers without resetting internal state - critical for multi-device bus sharing |
| 8 VCC | Power Supply | Single 2.3–3.6 V supply; decoupling capacitor required per datasheet layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Continuous Read Mode | Enables XIP execution with only 16 clocks of instruction overhead per 24-bit address - eliminates need for external RAM buffering during boot |
| Dual I/O SPI Interface | Uses IO0/IO1 for concurrent data transfer on both clock edges, doubling throughput versus standard SPI at same clock rate |
| Hardware + Software Write Protection | Combines /WP pin control with non-volatile SRP, TB, and BP2–BP0 bits to protect memory regions from accidental overwrite or malware injection |
| JEDEC Standard Identification | Supports ABh (Release Power-down/Device ID), 90h (Read Manufacturer/Device ID), and 9Fh (JEDEC ID) commands - ensures compatibility with automated programming tools and BOM validation systems |
| 64-bit Unique Serial Number | Provides cryptographically traceable device identity per unit - essential for secure firmware binding and anti-counterfeiting in certified systems |
| Low-Power Power-down Mode | Draws <1 µA typical current when idle - extends battery life in portable and remote sensor applications |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Logging |
|---|---|
Use Scenario: Storing firmware images and update payloads in programmable logic controllers deployed in factory automation environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Non-volatile code storage and boot loader execution target using Continuous Read Mode for XIP operation. Use Value: Enables deterministic boot within 50 ms while maintaining >20-year data integrity across −40°C to +85°C operating range. | Use Scenario: Recording calibration parameters, usage counters, and audit trails in Class II medical instruments requiring regulatory traceability and tamper resistance. IC Role / Device Role / Timing Role: Secure parameter archive with hardware-enforced write protection via /WP and SRP bits. Use Value: Prevents unauthorized modification of FDA-mandated settings while supporting >100,000 field recalibrations over product lifetime. |
| Automotive Infotainment Boot Memory | Smart Meter Firmware Update Cache |
Use Scenario: Hosting boot code and UI assets in head-unit systems where EMI resilience and SPI bus sharing with CAN controllers are required. IC Role / Device Role / Timing Role: High-reliability SPI flash with /HOLD pin support for interrupt-driven bus arbitration during CAN message bursts. Use Value: Guarantees uninterrupted firmware fetch under 100% bus load by pausing reads without losing internal address state. | Use Scenario: Caching over-the-air (OTA) firmware patches in utility-grade electricity meters operating unattended for 15+ years. IC Role / Device Role / Timing Role: Long-life field-upgrade storage with sector-level erase capability for atomic patch application. Use Value: Allows safe in-field updates using 4 KB sectors - minimizing risk of corruption during power loss events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT25DF041A-SSH-T | 4 M-bit density, 2.7–3.6 V supply, supports standard SPI only (no Dual I/O), 85 MHz max clock | Lacks Dual I/O and Continuous Read Mode - unsuitable for XIP or high-throughput boot scenarios | Select when cost sensitivity outweighs speed requirements and /HOLD functionality is unused |
| S25FL004K0XMFI011 | 4 M-bit density, 2.7–3.6 V supply, supports Quad SPI (QSPI) but not Dual I/O; 104 MHz clock, 40-pin SOIC package | Requires QSPI controller and larger PCB footprint; incompatible pinout and instruction set | Choose only if migrating to QSPI ecosystem and board redesign is feasible |
Compared with AT25DF041A-SSH-T and S25FL004K0XMFI011, the W25X40CLDAIG uniquely balances 104 MHz Dual I/O throughput, 8-pin SOIC compatibility, hardware write protection, and XIP-capable Continuous Read Mode - making it optimal for cost-sensitive, space-constrained embedded designs needing field-upgradable firmware with deterministic boot timing.
Availability
W25X40CLDAIG is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device configuration logging, and automotive infotainment boot memory requiring stable component supply and long-term lifecycle assurance.
Supply support for W25X40CLDAIG 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 serial flash, PSRAM, and audio codecs, with global manufacturing and quality certifications.
The W25X series was designed specifically for embedded systems requiring high-speed, low-pin-count non-volatile storage with robust write protection and execute-in-place capability - targeting consumer, industrial, and automotive applications where reliability and footprint matter.
FAQ
What is the package type and pin count of the W25X40CLDAIG?
The W25X40CLDAIG uses an 8-pin PDIP 300-mil package (package code DA), with standard through-hole mounting and 2.54 mm lead pitch. This package is fully compatible with legacy PCB layouts designed for industry-standard 8-pin DIP flash devices and supports manual or automated wave soldering processes without thermal stress concerns.
Does the W25X40CLDAIG support execute-in-place (XIP) operation?
Yes, the W25X40CLDAIG supports true XIP via its Continuous Read Mode, which reduces instruction overhead to as few as 16 clock cycles per 24-bit address. This allows microcontrollers to execute code directly from the W25X40CLDAIG without copying to RAM, significantly improving boot time and reducing system memory requirements in resource-constrained designs.
How does hardware write protection work on the W25X40CLDAIG?
Hardware write protection on the W25X40CLDAIG is implemented using the active-low /WP pin in conjunction with the non-volatile Status Register Protect (SRP) bit. When SRP = 1 and /WP is driven low, writes to the status register - including block protection configuration - are locked out, preventing unauthorized changes to memory protection settings even during firmware updates.
What SPI modes does the W25X40CLDAIG support?
The W25X40CLDAIG supports SPI Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 1), ensuring compatibility with most ARM Cortex-M, RISC-V, and legacy 8-bit MCU SPI peripherals. Both modes define valid clock idle states and sampling edges for reliable communication across varying controller implementations and signal integrity conditions.
Can the W25X40CLDAIG be used in automotive applications?
Yes, the W25X40CLDAIG is rated for −40°C to +85°C operation and meets industrial reliability standards including >100,000 erase/write cycles and >20-year data retention at +85°C. While not AEC-Q100 qualified, it is widely deployed in automotive infotainment and body control modules where extended temperature performance and deterministic SPI timing are required.
W25X40CLDAIG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Winbond Electronics Corporation
- Series:
- SpiFlash®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for W25X40CLDAIG through Aetrix?
Please submit a Request for Quotation (RFQ) for W25X40CLDAIG 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 reliable?
The price and inventory of W25X40CLDAIG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for W25X40CLDAIG is usually 5 days.
3.What payment methods are accepted for W25X40CLDAIG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for W25X40CLDAIG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for W25X40CLDAIG?
W25X40CLDAIG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your W25X40CLDAIG 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?
For technical support, including W25X40CLDAIG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your W25X40CLDAIG requirements.
6.How does Aetrix verify that W25X40CLDAIG is sourced from the original manufacturer or authorized distributors?
All W25X40CLDAIG 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 meets industry standards.
7.What is the process for return or replacement of W25X40CLDAIG?
All W25X40CLDAIG units undergo pre-shipment inspection (PSI). If there is an issue with W25X40CLDAIG, 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 part is unused and in its original packaging.
Return procedure for W25X40CLDAIG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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