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Winbond Electronics Corporation W25P40VSNIG
- Part No.:
- W25P40VSNIG
- Manufacturer:
- Winbond Electronics Corporation
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
W25P40VSNIG.pdf
- Description:
- IC FLASH 4MBIT SPI 40MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,116
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Product details
Overview
W25P40VSNIG from Winbond is a 4M-bit (512KB) serial Flash memory IC designed for SPI-based code storage and data logging in space-constrained embedded systems. It operates on a single 2.7–3.6V supply, delivers up to 40MHz read speed, supports page programming (≤256 bytes), sector erase (64KB), and chip erase (5s), and is housed in an 8-pin SOIC-150mil package.
For engineers reviewing the W25P40VSNIG datasheet, W25P40VSNIG pinout, W25P40VSNIG application, or W25P40VSNIG equivalent, this device is selected for low-pin-count, low-power firmware storage in microcontroller boot loaders, IoT sensor nodes, and portable medical devices where byte-addressable non-volatile memory with hardware write protection is required.
Technical Context
The W25P40VSNIG implements a standard SPI interface compliant with Modes 0 and 3, using four dedicated signals (CLK, /CS, DI, DO) plus /WP and /HOLD for enhanced bus control. Its internal architecture organizes 2048 pages of 256 bytes each into eight 64KB sectors, enabling granular erase control.
It features a status register with BUSY, WEL, BP2–BP0, and SRP bits for real-time operation monitoring and configurable hardware/software write protection. The /HOLD pin allows dynamic pausing of active SPI transfers without losing instruction state-critical when sharing the bus with other peripherals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4M-bit (512KB), organized as 2048 × 256-byte pages |
| Max SPI Clock Frequency | 40MHz Fast Read - enables ≤25ns per byte access in high-throughput boot scenarios |
| Supply Voltage | 2.7V–3.6V - compatible with 3.3V logic domains and battery-powered designs |
| Active Current | 4mA typical - minimizes power budget impact during firmware updates |
| Power-down Current | 1µA typical - extends battery life in always-on edge sensors |
| Erase/Write Endurance | 100,000 cycles - supports field firmware upgrades over product lifetime |
| Data Retention | 20 years - ensures long-term reliability in industrial deployments |
Pinout & Package
W25P40VSNIG is packaged in an 8-pin SOIC-150mil (Winbond package code SN), with gull-wing leads, 1.27mm pitch, and JEDEC MS-012AC compliance. This compact surface-mount package supports automated assembly and thermal performance suitable for consumer and industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| /CS | Chip Select Input | Active-low enable: drives DO to high-Z when high; required low-to-high transition after power-up before accepting instructions |
| DO | Serial Data Output | Tri-state output: shifts data/status LSB-first on falling CLK edge; high-Z during /HOLD or /CS high |
| /WP | Write Protect Input | Hardware lock: disables Status Register writes when low and SRP=1; prevents accidental configuration changes |
| GND | Ground Reference | Primary return path for VCC and all I/O signals; must be low-impedance for stable SPI timing |
| DI | Serial Data Input | Shifts instructions/addresses/data LSB-first on rising CLK edge; ignored during /HOLD or /CS high |
| CLK | Serial Clock Input | Master-generated timing signal; supports SPI Modes 0 (CLK idle low) and 3 (CLK idle high) |
| /HOLD | Hold Input | Pauses active SPI transfer: places DO in high-Z and ignores DI/CLK edges while /CS remains low |
| VCC | Power Supply | 2.7–3.6V primary supply; requires local 0.1µF decoupling near pin to suppress switching noise |
Key Features
| Feature | Design Value |
|---|---|
| Bottom Boot Sector Architecture | Reserves lowest address range for boot code storage - simplifies secure bootloader implementation |
| Hardware + Software Write Protection | Combines /WP pin control with SRP/BP bits to lock specific sectors (e.g., 0x060000–0x07FFFF) against overwrite |
| Auto-Increment Read Capability | Enables continuous sequential reads without reissuing address bytes - reduces CPU overhead in streaming applications |
| Manufacturer & Device ID Support | Verifies authenticity via 90h command (EFh manufacturer ID, 12h device ID) - critical for anti-cloning in certified medical devices |
| Power-Down Instruction (B9h) | Reduces current to 1µA and disables all instructions except Release Power-down (ABh) - prevents spurious writes during sleep |
Applications
| Firmware Storage in MCU Boot Loaders | Configuration Data Logging in IoT Sensors |
|---|---|
Use Scenario: Storing immutable bootloader code and recovery firmware in resource-limited microcontrollers like ARM Cortex-M0+. IC Role / Device Role / Timing Role: Non-volatile code storage with bottom-boot organization; provides deterministic startup timing via 40MHz Fast Read. Use Value: Enables secure, fast boot within 5ms from reset by reading first 512 bytes at full SPI clock rate - no wait states or prefetch stalls. |
Use Scenario: Capturing calibrated sensor offsets, calibration coefficients, and event timestamps in battery-powered environmental monitors. IC Role / Device Role / Timing Role: Low-power persistent data logger; uses Page Program (≤256B) for atomic parameter updates and /HOLD to pause mid-write during interrupt handling. Use Value: Guarantees data integrity across 100k+ write cycles and 20-year retention - eliminates need for external EEPROM or FRAM in Class II medical devices. |
| Secure Firmware Updates in Industrial Gateways | Audio Sample Storage in Portable Medical Devices |
Use Scenario: Hosting dual-image firmware partitions (active + standby) in edge gateways requiring A/B update rollback capability. IC Role / Device Role / Timing Role: Dual-sector managed storage; leverages Sector Erase (D8h) for atomic partition swaps and SRP/BP bits to lock active image. Use Value: Prevents bricking during OTA updates - hardware-enforced write protection ensures only designated sectors are modified during upgrade sequences. |
Use Scenario: Buffering short voice prompts, diagnostic tones, and patient alerts in handheld ultrasound probes and glucose meters. IC Role / Device Role / Timing Role: Audio waveform storage with byte-addressable read; uses Fast Read (0Bh) for jitter-free playback at 8kHz sampling. Use Value: Delivers glitch-free audio output with <10µs latency between address latch and first data bit - meets IEC 62304 Class B timing requirements. |
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-SSHN-B | 4M-bit SPI Flash, 85MHz max clock, 2.7–3.6V, SOIC-8; lacks /HOLD pin and has different status register layout | No hardware hold function - unsuitable for multi-peripheral SPI buses requiring dynamic arbitration | Select when maximum read throughput >40MHz is required and /HOLD is unused in system design |
| SST25VF040B-80-4I-SAE | 4M-bit SPI Flash, 80MHz max clock, 2.7–3.6V, SOIC-8; supports dual-I/O but no /WP pin or BP2 bit for full-array protection | Limited block protection granularity - cannot protect upper 1/8 or 1/4 sectors independently like W25P40VSNIG | Select when dual-I/O read acceleration is prioritized over fine-grained hardware write locking |
Compared with AT25DF041A-SSHN-B and SST25VF040B-80-4I-SAE, the W25P40VSNIG uniquely combines /HOLD functionality, full BP2–BP0 sector protection mapping, and verified 40MHz timing margins - making it the preferred choice for safety-critical boot storage where bus arbitration and configuration immutability are mandatory.
Availability
W25P40VSNIG is available at Aetrix Electronics and suitable for firmware storage in microcontroller boot loaders, configuration logging in IoT edge sensors, and audio sample buffering in portable medical devices requiring stable component supply across extended production lifecycles.
Supply support for W25P40VSNIG 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, mobile DRAM, and serial NOR/NAND Flash memory solutions for industrial, automotive, and computing markets.
The W25P series was engineered as a drop-in replacement for NexFlash NX25P devices, targeting cost-sensitive, low-power embedded systems needing reliable SPI Flash with hardware write protection and boot-sector organization.
FAQ
What is the memory organization of the W25P40VSNIG?
The W25P40VSNIG contains 4M-bit (512KB) of serial Flash memory, organized into 2048 programmable pages of 256 bytes each. These pages are grouped into eight erasable sectors of 64KB (256 pages) each. This structure enables flexible erase operations - either individual sectors or the entire chip - while supporting byte-addressable reads and page-aligned programming up to 256 bytes per instruction. The bottom-boot architecture reserves the lowest address range for boot code storage.
Does the W25P40VSNIG support SPI Mode 3?
Yes, the W25P40VSNIG fully supports both SPI Mode 0 (CPOL=0, CPHA=0) and SPI Mode 3 (CPOL=1, CPHA=1). In Mode 3, the Serial Clock (CLK) signal idles high, and data on the DI pin is sampled on the rising edge while data on the DO pin is clocked out on the falling edge. This dual-mode compatibility ensures interoperability with a wide range of microcontrollers, including legacy and newer ARM-based SoCs that default to Mode 3.
How does the /HOLD pin function in the W25P40VSNIG?
The /HOLD pin in the W25P40VSNIG allows active SPI transactions to be paused without resetting internal state. When /HOLD is asserted low while /CS is active (low), the DO pin goes high-impedance and DI/CLK signals are ignored. Operation resumes upon /HOLD returning high. This feature is essential in multi-device SPI systems - for example, when a priority interrupt forces temporary bus release during a Page Program cycle in the W25P40VSNIG, preserving buffer contents and eliminating retransmission overhead.
What write protection mechanisms does the W25P40VSNIG provide?
The W25P40VSNIG implements layered write protection: hardware-level via the /WP pin (active-low, disables Status Register writes when SRP=1), software-configurable via Block Protect (BP2–BP0) bits in the status register, and instruction-level via Write Enable/Disable commands. BP2–BP0 allow selective locking of memory portions - e.g., setting BP2=0, BP1=1, BP0=0 protects the upper 1/4 (0x060000–0x07FFFF) - ensuring critical firmware or calibration data remains immutable even if firmware bugs attempt writes.
Is the W25P40VSNIG pin-compatible with earlier NexFlash devices?
Yes, the W25P40VSNIG is fully pin- and function-compatible with the NexFlash NX25P40, including identical SOIC-8 pinout, electrical characteristics, instruction set, and timing parameters. Winbond explicitly states full compatibility in the datasheet, enabling seamless migration without PCB or firmware changes. This backward compatibility extends to all control signals (/CS, /WP, /HOLD), I/O pins (DI, DO, CLK), and power connections (VCC, GND).
W25P40VSNIG 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:
- 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
W25P40VSNIG FAQ
1.How can I place an order for W25P40VSNIG through Aetrix?
Please submit a Request for Quotation (RFQ) for W25P40VSNIG 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 W25P40VSNIG reliable?
The price and inventory of W25P40VSNIG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for W25P40VSNIG is usually 5 days.
3.What payment methods are accepted for W25P40VSNIG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for W25P40VSNIG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for W25P40VSNIG?
W25P40VSNIG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your W25P40VSNIG 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 W25P40VSNIG?
For technical support, including W25P40VSNIG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your W25P40VSNIG requirements.
6.How does Aetrix verify that W25P40VSNIG is sourced from the original manufacturer or authorized distributors?
All W25P40VSNIG 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 W25P40VSNIG meets industry standards.
7.What is the process for return or replacement of W25P40VSNIG?
All W25P40VSNIG units undergo pre-shipment inspection (PSI). If there is an issue with W25P40VSNIG, 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 W25P40VSNIG part is unused and in its original packaging.
Return procedure for W25P40VSNIG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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