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Winbond Electronics Corporation W25B40AVSNIG
- Part No.:
- W25B40AVSNIG
- Manufacturer:
- Winbond Electronics Corporation
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
W25B40AVSNIG.pdf
- Description:
- IC FLASH 4MBIT SPI 40MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,436
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Product details
Overview
W25B40AVSNIG from Winbond is a 4 Mbit (512 KB) serial NOR 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 (seven 64 KB + one each of 32 KB, 16 KB, 8 KB, and two 4 KB), enabling robust boot code and parameter storage in space-constrained microcontroller systems.
For engineers reviewing the W25B40AVSNIG datasheet, W25B40AVSNIG pinout, W25B40AVSNIG application, or W25B40AVSNIG equivalent, key selection criteria include boot-sector flexibility, BP2–BP0 programmable protection granularity, SOIC-8 (150-mil) package compatibility, and 100,000 erase/write cycle endurance with 20-year data retention.
Technical Context
The W25B40AVSNIG implements a standard 4-wire SPI interface with /CS, CLK, DI, and DO signals, supporting both Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1). Its status register includes BUSY, WEL, BP2–BP0, and SRP bits for real-time operation monitoring and fine-grained memory protection.
It uses bottom-boot sector organization by default (Device ID = 32h), with optional top-boot variant (42h) available on special order. Sector erase times range from 120 ms to 650 ms depending on sector size, and page programming completes in ≤2 ms for up to 256 bytes per page.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512 KB) - supports full firmware images and configuration parameters in compact embedded systems |
| Interface | 4-pin SPI (CLK, /CS, DI, DO) - minimal GPIO usage, compatible with most MCUs without additional level-shifting |
| Max Clock Frequency | 40 MHz - enables fast read throughput up to ~5 MB/s in Fast Read mode with dummy cycles |
| Operating Voltage | 2.7 V to 3.6 V - matches standard 3.3 V logic rails and battery-powered designs |
| Erase/Write Endurance | 100,000 cycles - ensures long-term reliability in field-updatable firmware storage |
| Data Retention | 20 years at +85°C - guarantees parameter integrity over product lifetime in industrial environments |
| Temperature Range | −40°C to +85°C - qualified for automotive and industrial ambient conditions |
Pinout & Package
W25B40AVSNIG is packaged in an 8-pin SOIC (150-mil body), Winbond package code SN. Pin assignments are standardized across all W25B40/W25B40A variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 /CS | Chip Select Input | Active-low enable signal; device enters high-impedance output state when high, and accepts instructions only when low |
| 2 DO | Serial Data Output | Tri-state output; data shifted out on falling edge of CLK; high-impedance during /HOLD or /CS high |
| 3 /WP | Hardware Write Protect | Active-low pin that locks Status Register writes when SRP = 1, enabling hardware-enforced protection of boot sectors |
| 4 GND | Ground Reference | Signal and power return path; must be low-impedance to ensure stable SPI timing and noise immunity |
| 5 DI | Serial Data Input | Instruction/address/data input; sampled on rising edge of CLK; MSB-first protocol |
| 6 CLK | Serial Clock Input | Master-generated clock; defines timing for all SPI transactions; supports idle-high (Mode 3) and idle-low (Mode 0) |
| 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 | 2.7–3.6 V supply; internal voltage regulator ensures consistent core operation across rail variation |
Key Features
| Feature | Design Value |
|---|---|
| Bottom-boot sector organization | Fixed boot code storage in lowest-address 4 KB sector (000000h–000FFFh), enabling safe reset vector execution |
| Twelve variable-size sectors | Enables optimized layout: 64 KB for main firmware, 4–32 KB for bootloader, calibration tables, and runtime parameters |
| BP2–BP0 software-selectable protection | Eight protection configurations-from full array lock to single 4 KB sector-prevents accidental overwrite of critical boot code |
| /HOLD pin support | Allows atomic suspension/resumption of Page Program or Sector Erase operations during MCU interrupt servicing |
| Power-down mode | Reduces current to <1 µA while preserving memory contents and register state-ideal for battery-backed systems |
Applications
| Industrial PLC Firmware Storage | Medical Device Calibration Data |
|---|---|
Use Scenario: Storing and updating firmware images and safety-critical configuration data in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Non-volatile program memory holding bootloader, application firmware, and I/O mapping tables; accessed via SPI during cold start and OTA updates. Use Value: Bottom-boot architecture ensures reset vector always loads from protected 4 KB sector; BP2–BP0 bits prevent corruption during partial reflash operations. | Use Scenario: Retaining factory-calibrated sensor offsets and user-adjusted therapy parameters in portable infusion pumps. IC Role / Device Role / Timing Role: Parameter EEPROM replacement; stores infrequently modified but mission-critical values with guaranteed 20-year retention at +85°C. Use Value: Hardware /WP + SRP bit locking prevents unintended writes during ESD events or brown-out conditions common in clinical environments. |
| Automotive Body Control Module | Smart Meter Firmware & Tariff Tables |
Use Scenario: Holding lighting control logic, window lift profiles, and CAN gateway firmware in 12 V automotive subsystems. IC Role / Device Role / Timing Role: Boot memory mapped to MCU's XIP-capable SPI interface; executes initial startup sequence before RAM initialization. Use Value: 40 MHz Fast Read mode enables sub-100 ms boot time; top-boot variant (42h) supports legacy BOM migration where boot region resides at highest address. | Use Scenario: Storing tariff schedules, billing history, and regulatory compliance firmware in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: Secure parameter store with dual protection: software BP bits for scheduled updates and /WP pin for tamper-resistant field service access. Use Value: Two 4 KB protected sectors allow independent locking of tariff tables (read-only) and firmware (write-protected during normal operation). |
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 |
|---|---|---|---|
| W25Q40BVSNIG | Same 4 Mbit density, SOIC-8 package, and pinout; adds Quad SPI (QPI) mode and faster erase times (typ. 100 ms sector erase) | Supports higher throughput in QPI mode but requires MCU QSPI peripheral; lacks dedicated bottom/top boot Device ID differentiation | Select W25Q40BVSNIG if system requires faster field updates or QSPI bandwidth; retain W25B40AVSNIG for strict bottom-boot ID dependency or legacy design continuity |
| AT25DF041A-SHN-T | 4 Mbit SPI flash in SOIC-8; supports 85 MHz clock, deeper power-down (<100 nA), but only eight uniform 64 KB sectors and no BP-bit granularity below 64 KB | No small boot sectors-requires external logic or firmware workarounds to protect reset vectors; lacks /HOLD pin | Choose AT25DF041A-SHN-T only if maximum clock speed or ultra-low standby current is prioritized over boot-sector protection flexibility |
Compared with W25Q40BVSNIG and AT25DF041A-SHN-T, the W25B40AVSNIG uniquely delivers deterministic bottom-boot behavior with Device ID 32h and granular 4 KB–32 KB sector protection-making it optimal for safety-certified firmware storage where boot integrity verification depends on fixed address mapping and hardware-enforced write lock.
Availability
W25B40AVSNIG is available at Aetrix Electronics and suitable for industrial PLCs, medical infusion pumps, automotive body controllers, and smart metering systems requiring stable component supply, long-lifecycle support, and verified boot-sector reliability.
Supply support for W25B40AVSNIG 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, RAM, and mobile DRAM, serving industrial, automotive, and consumer markets since 1987.
The W25B series was designed specifically for embedded systems requiring secure, sector-flexible boot memory with hardware-assisted write protection-targeting applications where firmware integrity and field update robustness are non-negotiable.
FAQ
What boot sector configuration does W25B40AVSNIG use by default?
W25B40AVSNIG uses bottom-boot sector organization as standard, with Device ID 32h. This places the smallest 4 KB sector (000000h–000FFFh) at the lowest address for reset vector execution. Top-boot configuration (Device ID 42h) is available only as a special-order variant and is not implemented in the W25B40AVSNIG part number.
Does W25B40AVSNIG support Quad SPI (QSPI) mode?
No, W25B40AVSNIG supports only standard 4-wire SPI (single I/O) in Modes 0 and 3. It does not implement Quad SPI instructions or pin multiplexing for QIO/QPI operation. For QSPI capability, consider the pin-compatible W25Q40BVSNIG, which shares the same SOIC-8 package and 4 Mbit density but adds quad-mode support.
How many write/erase cycles does W25B40AVSNIG guarantee?
W25B40AVSNIG guarantees 100,000 program/erase cycles per sector, validated per JEDEC JESD22-A117. This endurance rating applies across all twelve sectors-including the two 4 KB boot sectors-and is specified under standard operating conditions (2.7–3.6 V, −40°C to +85°C).
Can W25B40AVSNIG's /HOLD pin suspend an ongoing Sector Erase command?
Yes, the /HOLD pin can pause an active Sector Erase operation when asserted low while /CS remains low. The internal erase state is preserved, and the command resumes automatically upon /HOLD deassertion-enabling deterministic interruption handling in real-time systems without data loss or command restart overhead.
What is the function of the /WP pin on W25B40AVSNIG?
The /WP pin on W25B40AVSNIG provides hardware-level write protection for the Status Register when the SRP bit is set to 1. With /WP held low, the Write Status Register instruction (01h) is blocked-even if WEL = 1-preventing unauthorized changes to BP2–BP0 protection bits and ensuring boot sector immutability during power transients or noise events.
W25B40AVSNIG 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
W25B40AVSNIG FAQ
1.How can I place an order for W25B40AVSNIG through Aetrix?
Please submit a Request for Quotation (RFQ) for W25B40AVSNIG 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 W25B40AVSNIG reliable?
The price and inventory of W25B40AVSNIG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for W25B40AVSNIG is usually 5 days.
3.What payment methods are accepted for W25B40AVSNIG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for W25B40AVSNIG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for W25B40AVSNIG?
W25B40AVSNIG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your W25B40AVSNIG 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 W25B40AVSNIG?
For technical support, including W25B40AVSNIG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your W25B40AVSNIG requirements.
6.How does Aetrix verify that W25B40AVSNIG is sourced from the original manufacturer or authorized distributors?
All W25B40AVSNIG 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 W25B40AVSNIG meets industry standards.
7.What is the process for return or replacement of W25B40AVSNIG?
All W25B40AVSNIG units undergo pre-shipment inspection (PSI). If there is an issue with W25B40AVSNIG, 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 W25B40AVSNIG part is unused and in its original packaging.
Return procedure for W25B40AVSNIG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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