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Winbond Electronics Corporation W25B40VSNIG
- Part No.:
- W25B40VSNIG
- Manufacturer:
- Winbond Electronics Corporation
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
W25B40VSNIG.pdf
- Description:
- IC FLASH 4MBIT SPI 40MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,897
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Product details
Overview
W25B40VSNIG from Winbond is a 4 M-bit (512 KB) serial Flash memory IC designed for boot code and parameter storage in embedded systems. It features bottom-boot sector organization, 4-pin SPI interface (CLK, /CS, DI, DO), 40 MHz max clock frequency, and supports SPI Modes 0 and 3. Its twelve-sector architecture includes two 4 KB sectors ideal for firmware recovery and configuration data in microcontroller-based applications.
For engineers reviewing the W25B40VSNIG datasheet, W25B40VSNIG pinout, W25B40VSNIG application, or W25B40VSNIG equivalent, key selection criteria include boot-sector protection granularity, hardware /WP and /HOLD support, 2.7–3.6 V single-supply operation, -40°C to +85°C industrial temperature range, and SOIC-8 (150-mil) package compatibility with space-constrained PCB layouts.
Technical Context
The W25B40VSNIG implements a bottom-boot sector map with seven 64 KB, one 32 KB, one 16 KB, one 8 KB, and two 4 KB sectors - enabling fine-grained write protection of critical boot code. Its status register includes BP2–BP0 and SRP bits that allow software-controlled, non-volatile protection of individual sectors or full array, independent of /WP pin state when SRP = 0.
It supports standard SPI Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 1), with data latched on CLK rising edge (DI) and output on falling edge (DO). The /HOLD pin enables bus arbitration by pausing active operations without resetting internal state, while /WP provides hardware-level status register lockout when SRP = 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 M-bit / 512 KB total storage capacity, sufficient for bootloader + configuration + small firmware images |
| Interface | 4-wire SPI (CLK, /CS, DI, DO); no additional control lines required for basic operation |
| Max Clock Frequency | 40 MHz - enables fast read throughput up to ~5 MB/s in Fast Read mode |
| Operating Voltage | 2.7 V to 3.6 V - compatible with 3.3 V logic systems and tolerant of supply variation |
| Temperature Range | -40°C to +85°C - qualified for industrial-grade embedded deployment |
| Endurance | 100,000 program/erase cycles per sector - supports field firmware updates over product lifetime |
| Data Retention | 20 years at +85°C - ensures long-term reliability of stored boot parameters and calibration data |
Pinout & Package
W25B40VSNIG is housed in an 8-pin SOIC package with 150-mil body width (Winbond package code SN), surface-mount compatible and footprint-compatible with industry-standard serial Flash devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| /CS | Chip Select Input | Active-low enable; device enters high-impedance DO state and standby current (<1 µA) when high |
| DO | Serial Data Output | Tri-state output; data shifted out on CLK falling edge; high-Z during /HOLD or /CS high |
| /WP | Write Protect Input | Hardware lock for status register writes when SRP = 1; active-low, internally pulled up |
| GND | Ground Reference | Primary return path for VCC and all I/O signals; must be low-impedance connection |
| DI | Serial Data Input | Instruction/address/data input; sampled on CLK rising edge; MSB-first protocol |
| CLK | Serial Clock Input | Master-generated timing signal; determines data rate and sampling edges for DI/DO |
| /HOLD | Hold Control Input | Pauses ongoing SPI transaction (e.g., page program) without aborting; requires /CS low to activate |
| VCC | Power Supply | Single 2.7–3.6 V supply; powers core logic, memory array, and I/O buffers |
Key Features
| Feature | Design Value |
|---|---|
| Bottom-boot sector layout | Two 4 KB sectors at lowest address (000000h–000FFFh) enable safe in-field bootloader updates without risking corruption of main firmware |
| Configurable sector protection | BP2–BP0 bits allow software-selectable protection of any contiguous sector group - e.g., lock only 4 KB boot sector while leaving rest writable |
| /HOLD pin functionality | Enables deterministic SPI bus sharing across multiple peripherals; preserves internal state during priority interrupt handling |
| Hardware + software write protection | Combines /WP pin control with SRP/BP bits to prevent accidental erase/write during power transients or firmware bugs |
| Fast Read (0Bh) instruction | Inserts dummy clock cycle to relax timing margins - improves read reliability at high clock rates or on noisy boards |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Storing boot loader, safety-critical firmware, and calibration tables in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Non-volatile boot memory providing deterministic startup sequence and secure parameter retention across power cycles. Use Value: Bottom-boot 4 KB sectors ensure bootloader integrity; 20-year data retention guarantees calibration persistence over equipment lifetime. | Use Scenario: Holding device-specific settings (e.g., sensor offsets, alarm thresholds, user preferences) in portable diagnostic instruments with battery backup. IC Role / Device Role / Timing Role: Parameter storage IC interfacing directly to MCU SPI port; accessed during initialization and runtime configuration updates. Use Value: Hardware /WP pin prevents unintended writes during brown-out conditions; -40°C to +85°C rating supports clinical and field use. |
| Automotive Body Control Module | Smart Energy Meter Firmware |
Use Scenario: Hosting boot code and vehicle-specific configuration (e.g., lighting profiles, door lock logic) in 12 V automotive ECUs with wide-input DC-DC supplies. IC Role / Device Role / Timing Role: Serial Flash memory providing SPI-accessible, electrically erasable storage for firmware and trim data. Use Value: 2.7–3.6 V operation tolerates automotive load-dump and cold-crank voltage excursions; 100K-cycle endurance supports OTA update campaigns. | Use Scenario: Storing meter firmware, tariff tables, and cryptographic keys in ANSI C12.22-compliant smart electricity meters operating in utility substations. IC Role / Device Role / Timing Role: Secure, tamper-resistant non-volatile memory for field-upgradable firmware and regulatory-compliant data logs. Use Value: Block protect bits (BP2–BP0) enable locking of crypto key sectors; SOIC-8 package fits constrained meter PCB real estate. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| W25Q40BVSNIG | Quad SPI (QPI) capable, 104 MHz dual/quad read, deeper feature set (security registers, 4-byte addressing), same 4 M-bit density and SOIC-8 package | Supports faster boot times and advanced security features; requires QSPI-capable host controller | Select when higher throughput or enhanced security (e.g., OTP locks) is required; not drop-in for standard SPI-only designs |
| AT25DF041A-SHN-T | 4 M-bit SPI Flash from Microchip; identical 8-pin SOIC package, 2.7–3.6 V, -40°C to +85°C, but uses different status register layout and lacks /HOLD pin | No hardware hold function; write protection controlled solely via status register; may require firmware adaptation | Choose for second-source continuity where /HOLD is unused and register mapping can be updated |
Compared with W25Q40BVSNIG, the W25B40VSNIG offers simpler SPI-only interface and lower gate count MCU compatibility; versus AT25DF041A-SHN-T, it provides /HOLD for robust multi-peripheral SPI sharing and more flexible boot-sector protection granularity - making it preferable for resource-constrained industrial controllers requiring deterministic bus arbitration and fine-grained firmware partitioning.
Availability
W25B40VSNIG is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, automotive body electronics, and smart metering applications requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for W25B40VSNIG 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, Flash memory, and mobile chips since 1987.
The W25B series targets cost-sensitive, space-constrained embedded systems needing reliable boot and parameter storage - emphasizing sector flexibility, industrial temperature operation, and SPI simplicity over high-speed quad interfaces.
FAQ
What is the boot sector configuration of the W25B40VSNIG?
The W25B40VSNIG uses bottom-boot sector organization as standard, with two 4 KB sectors located at the lowest address (000000h–000FFFh and 001000h–001FFFh). This layout isolates critical bootloader code at the start of memory, enabling safe firmware updates without risking corruption of the primary application image. Top-boot configuration is available only as special order (W25B40A variant) with Device ID 42h.
Does the W25B40VSNIG support Quad SPI or QPI mode?
No, the W25B40VSNIG supports only standard 4-wire SPI (CLK, /CS, DI, DO) in Modes 0 and 3. It does not implement Quad SPI (QPI), Dual SPI, or any multi-I/O command protocols. For Quad SPI capability at the same density, consider the pin-compatible W25Q40BVSNIG, which adds QPI mode and faster read speeds but requires host controller support for extended instructions.
How does hardware write protection work on the W25B40VSNIG?
Hardware write protection on the W25B40VSNIG is implemented via the /WP pin in conjunction with the Status Register Protect (SRP) bit. When SRP = 1, the /WP pin (active-low) disables all status register writes - preventing changes to block protection bits (BP2–BP0) and SRP itself. This provides fail-safe protection against spurious writes during power instability or noise events, independent of software state.
What is the maximum clock frequency supported by the W25B40VSNIG?
The W25B40VSNIG supports a maximum serial clock (CLK) frequency of 40 MHz for standard Read Data (03h) and Fast Read (0Bh) operations. At this rate, byte reads complete in ≤25 ns per bit, enabling sustained throughput up to ~5 MB/s in Fast Read mode. Timing compliance requires adherence to AC specifications including tV, tVH, tCH, and tCL as defined in the datasheet.
Can the W25B40VSNIG be used in place of the W25P40?
The W25B40VSNIG is compatible with the W25P40 at the SPI protocol level but differs in sector map and protection features. It replaces the W25P40's eight uniform 64 KB sectors with twelve variable-size sectors (including two 4 KB boot sectors) and adds enhanced block protection granularity via BP2–BP0. Pinout and instruction set are identical, making it a functional upgrade - not a direct drop-in - requiring firmware validation of sector erase addresses and protection register usage.
W25B40VSNIG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Winbond Electronics Corporation
- Series:
- SpiFlash®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 40 MHz
- Write Cycle Time - Word, Page:
- 15ms, 5ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
W25B40VSNIG FAQ
1.How can I place an order for W25B40VSNIG through Aetrix?
Please submit a Request for Quotation (RFQ) for W25B40VSNIG 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 W25B40VSNIG reliable?
The price and inventory of W25B40VSNIG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for W25B40VSNIG is usually 5 days.
3.What payment methods are accepted for W25B40VSNIG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for W25B40VSNIG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for W25B40VSNIG?
W25B40VSNIG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your W25B40VSNIG 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 W25B40VSNIG?
For technical support, including W25B40VSNIG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your W25B40VSNIG requirements.
6.How does Aetrix verify that W25B40VSNIG is sourced from the original manufacturer or authorized distributors?
All W25B40VSNIG 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 W25B40VSNIG meets industry standards.
7.What is the process for return or replacement of W25B40VSNIG?
All W25B40VSNIG units undergo pre-shipment inspection (PSI). If there is an issue with W25B40VSNIG, 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 W25B40VSNIG part is unused and in its original packaging.
Return procedure for W25B40VSNIG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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