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Winbond Electronics Corporation W25B40VSNIG T&R
- Part No.:
- W25B40VSNIG T&R
- Manufacturer:
- Winbond Electronics Corporation
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
W25B40VSNIG T&R.pdf
- Description:
- IC FLASH 4MBIT SPI 40MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,919
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Product details
Overview
W25B40VSNIG T&R from Winbond is a 4 Mbit (512 KB) serial flash memory IC with bottom-boot sector architecture, SPI interface (Modes 0/3), 40 MHz max clock, and hardware/software write protection. It features twelve non-uniform sectors (including two 4 KB boot sectors), 256-byte page programming, and operates from 2.7–3.6 V for embedded firmware storage in microcontroller-based systems.
For engineers reviewing the W25B40VSNIG T&R datasheet, W25B40VSNIG T&R pinout, W25B40VSNIG T&R application, or W25B40VSNIG T&R equivalent, key selection criteria include boot-sector granularity (4 KB/8 KB), BP2-BP0 status register protection mapping, SOIC-8 SN package compatibility, and support for fast read (0Bh) and power-down (B9h) instructions in resource-constrained designs.
Technical Context
The W25B40VSNIG T&R implements a bottom-boot sector organization with fixed address mapping: seven 64 KB sectors, one 32 KB, one 16 KB, one 8 KB, and two 4 KB sectors - enabling precise protection of boot code at 000000h–000FFFh. Its SPI interface supports dual-phase clocking with data sampled on CLK rising edge (DI) and output on falling edge (DO).
Write protection is enforced via three non-volatile Block Protect bits (BP2–BP0) in the status register, configurable via Write Status Register (01h), and gated by Status Register Protect (SRP) and active-low /WP pin. The device enters automatic write-disable state after power-up or completion of any program/erase instruction, requiring explicit Write Enable (06h) before modification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512 KB) total storage capacity, byte-addressable via SPI |
| Sector Architecture | Twelve sectors: seven 64 KB + one 32 KB + one 16 KB + one 8 KB + two 4 KB - optimized for boot code and parameter storage |
| Page Size | 256 bytes per programmable page; enables efficient partial updates without full sector erase |
| Max Clock Frequency | 40 MHz SPI clock - supports high-throughput firmware reads in real-time systems |
| Supply Voltage | 2.7 V to 3.6 V - compatible with 3.3 V logic domains and battery-backed operation |
| Active Current | 5 mA typical during read/program - suitable for low-power portable and IoT endpoints |
| Data Retention | 20 years at +85°C - ensures long-term reliability for industrial firmware storage |
| Erase/Write Cycles | 100,000 cycles per sector - supports field firmware updates over product lifetime |
Pinout & Package
W25B40VSNIG T&R is housed in an 8-pin SOIC 150-mil package (Winbond package code SN), with standard pinout matching JEDEC MS-012AC. All pins are electrically and mechanically defined per datasheet Figure 1 and Section 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| /CS | Chip Select Input | Active-low enable; must transition high→low after power-up to accept instructions; drives DO to high-Z when deasserted |
| 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 | Active-low hardware gate for status register writes; effective only when SRP = 1 |
| GND | Ground Reference | Signal and power return path; required for stable SPI timing and voltage threshold referencing |
| DI | Serial Data Input | Instruction/address/data input; latched on CLK rising edge; MSB-first protocol |
| CLK | Serial Clock Input | Master-generated timing signal; supports SPI Modes 0 (CLK idle low) and 3 (CLK idle high) |
| /HOLD | Hold Control Input | Active-low pause signal; suspends ongoing SPI transaction while /CS remains low; preserves internal state |
| VCC | Power Supply | 2.7–3.6 V supply; powers core logic and I/O; requires local decoupling per datasheet layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Bottom-boot sector layout | Fixed 4 KB boot sector at lowest address (000000h–000FFFh) enables secure bootloader execution and atomic firmware updates |
| Hardware write protection | /WP pin + SRP bit combination prevents accidental status register changes during brown-out or noise events |
| Flexible sector protection | BP2–BP0 bits allow granular locking of boot/parameter regions (e.g., 4 KB, 8 KB, or 16 KB) without protecting entire memory |
| Fast Read instruction (0Bh) | Adds dummy cycle for higher-speed reads up to 40 MHz - reduces boot latency in time-critical applications |
| Power-down mode (B9h) | Reduces current to <1 µA; retains memory contents and status register settings; exited via ABh command |
| Auto-increment read capability | Enables continuous sequential reads across address boundaries without reissuing address bytes - simplifies firmware loader implementation |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader |
|---|---|
Use Scenario: Storing certified bootloader and safety-critical firmware in programmable logic controllers with strict update validation requirements. IC Role / Device Role / Timing Role: Non-volatile boot memory providing deterministic startup sequence and secure firmware integrity verification. Use Value: Dual 4 KB boot sectors allow A/B firmware partitioning; BP2–BP0 bits lock bootloader region while permitting parameter updates in adjacent 8 KB sector. | Use Scenario: Hosting FDA-compliant bootloader and calibration data in portable diagnostic equipment requiring traceable firmware revisions. IC Role / Device Role / Timing Role: Parameter and boot code storage with hardware-enforced write protection during clinical operation. Use Value: /WP pin + SRP bit prevents runtime corruption of bootloader; 20-year data retention ensures calibration persistence across device lifecycle. |
| Smart Meter Firmware Update | Automotive Body Control Module |
Use Scenario: Field-upgradable firmware in utility meters exposed to wide temperature swings and EMI-rich environments. IC Role / Device Role / Timing Role: SPI-connected flash memory managing OTA firmware images and configuration profiles. Use Value: Bottom-boot architecture isolates boot code from update partitions; 100,000 erase cycles support decade-long field deployment with periodic patches. | Use Scenario: Storing vehicle-specific configuration tables and CAN firmware in body control units operating from -40°C to +85°C. IC Role / Device Role / Timing Role: Embedded serial flash providing robust, low-pin-count storage for automotive-grade microcontrollers. Use Value: SOIC-8 SN package fits space-constrained PCB layouts; 2.7–3.6 V operation matches automotive 3.3 V rail tolerances. |
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 (QSPI) capable, 40 MHz single-line read, 104 MHz quad read; same 4 Mbit density and SOIC-8 SN package | Supports faster firmware load times via QSPI x4 mode; requires QSPI-capable host controller | Select W25Q40BVSNIG if host MCU supports QSPI and boot speed >40 MB/s is required; otherwise W25B40VSNIG T&R provides proven SPI compatibility with simpler driver stack. |
| AT25DF041A-SHN-T | Same 4 Mbit density, SOIC-8 package, and SPI Mode 0/3 support; includes additional security register and OTP lock bits | Offers enhanced security features including one-time-programmable (OTP) lockdown for production firmware signing keys | Choose AT25DF041A-SHN-T when cryptographic key protection or factory-lockdown is mandatory; W25B40VSNIG T&R prioritizes cost-effective, widely supported boot flash functionality. |
Compared with W25Q40BVSNIG and AT25DF041A-SHN-T, the W25B40VSNIG T&R delivers optimized bottom-boot sector granularity and minimal SPI interface complexity - making it ideal for legacy or cost-sensitive microcontroller platforms where QSPI or advanced security are unnecessary.
Availability
W25B40VSNIG T&R is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device bootloader implementation, and smart meter field-upgrade applications requiring stable component supply and long-term obsolescence management.
Supply support for W25B40VSNIG T&R 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, serving industrial, communications, and consumer markets since 1987.
The W25B40VSNIG T&R belongs to Winbond's W25B family of serial flash memories designed specifically for reliable boot code and parameter storage in microcontroller-based embedded systems with constrained pin count and power budgets.
FAQ
What boot sector organization does the W25B40VSNIG T&R use?
The W25B40VSNIG T&R uses bottom-boot sector organization as standard, with two 4 KB boot sectors located at the lowest address range (000000h–000FFFh). This layout ensures the bootloader executes first and can be independently protected using BP2–BP0 status register bits. Top-boot configuration is available only as special order (W25B40A variant) with Device ID 42h.
Does the W25B40VSNIG T&R support Quad SPI (QSPI) interface?
No, the W25B40VSNIG T&R supports only standard 4-wire SPI (CLK, /CS, DI, DO) in Modes 0 and 3. It does not implement Quad SPI commands or pin multiplexing for QSPI. For QSPI capability, consider the pin-compatible W25Q40BVSNIG, which shares the same SOIC-8 SN package but adds x4 read mode support.
How is hardware write protection implemented on the W25B40VSNIG T&R?
Hardware write protection on the W25B40VSNIG T&R is implemented using the active-low /WP pin in conjunction with the Status Register Protect (SRP) bit. When SRP = 1 and /WP is driven low, all writes to the status register (including BP2–BP0) are blocked - preventing accidental modification of boot sector protection settings during power transients or EMI events.
What is the maximum clock frequency supported by the W25B40VSNIG T&R?
The W25B40VSNIG T&R supports a maximum SPI clock frequency of 40 MHz for standard read operations and Fast Read (0Bh) mode. This timing is validated across the full operating temperature range (-40°C to +85°C) and supply voltage (2.7–3.6 V), enabling sub-100 µs boot code fetches in performance-critical applications.
Can the W25B40VSNIG T&R be used in place of the W25P40?
The W25B40VSNIG T&R is compatible with the W25P40 at the SPI protocol level but offers enhanced sector flexibility: twelve sectors (vs. eight) including dedicated 4 KB and 8 KB boot sectors, and finer-grained BP2–BP0 protection mapping. Pinout and instruction set are identical, allowing drop-in replacement where bottom-boot granularity and robust field update capability are required.
W25B40VSNIG T&R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Winbond Electronics Corporation
- Series:
- SpiFlash®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 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 T&R FAQ
1.How can I place an order for W25B40VSNIG T&R through Aetrix?
Please submit a Request for Quotation (RFQ) for W25B40VSNIG T&R 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 T&R reliable?
The price and inventory of W25B40VSNIG T&R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for W25B40VSNIG T&R is usually 5 days.
3.What payment methods are accepted for W25B40VSNIG T&R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for W25B40VSNIG T&R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for W25B40VSNIG T&R?
W25B40VSNIG T&R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your W25B40VSNIG T&R 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 T&R?
For technical support, including W25B40VSNIG T&R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your W25B40VSNIG T&R requirements.
6.How does Aetrix verify that W25B40VSNIG T&R is sourced from the original manufacturer or authorized distributors?
All W25B40VSNIG T&R 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 T&R meets industry standards.
7.What is the process for return or replacement of W25B40VSNIG T&R?
All W25B40VSNIG T&R units undergo pre-shipment inspection (PSI). If there is an issue with W25B40VSNIG T&R, 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 T&R part is unused and in its original packaging.
Return procedure for W25B40VSNIG T&R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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