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Winbond Electronics Corporation W25P20VSNIG
- Part No.:
- W25P20VSNIG
- Manufacturer:
- Winbond Electronics Corporation
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
W25P20VSNIG.pdf
- Description:
- IC FLASH 2MBIT SPI 40MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,604
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Product details
Overview
W25P20VSNIG from Winbond is a 2M-bit (256K-byte) serial Flash memory IC with SPI interface, organized as 1024 pages of 256 bytes each and grouped into 4 erasable sectors of 64KB. It operates on a single 2.7V–3.6V supply, draws 4mA active current and 1µA in power-down mode, and supports 40MHz Fast Read timing. It is used for code storage and data logging in microcontroller-based embedded systems.
For engineers reviewing the W25P20VSNIG datasheet, W25P20VSNIG pinout, W25P20VSNIG application, or W25P20VSNIG equivalent, this page delivers verified electrical specs, SOIC-8 pin mapping, hardware/software write protection behavior, sector-level erase control, and migration-compatible alternatives for legacy Serial Flash designs.
Technical Context
The W25P20VSNIG implements a standard SPI bus interface supporting Modes 0 and 3, with clocked data input on CLK rising edge and output on falling edge. It features dedicated /CS, /WP, and /HOLD control lines enabling multi-device sharing and hardware-based memory protection.
Its internal architecture includes a status register with BUSY, WEL, BP1/BP0, and SRP bits - all non-volatile except BUSY and WEL - allowing configurable sector-level write protection and automatic write-disable after program/erase cycles. The device resets at VCC < VWI and enforces tPUW delay before accepting write instructions post-power-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2M-bit (256K-byte), organized as 1024 × 256-byte pages |
| Interface Speed | 40MHz Fast Read - enables sub-100ns per-byte access in burst mode |
| Supply Voltage | 2.7V to 3.6V - compatible with 3.3V logic systems without level shifting |
| Active Current | 4mA typical - supports low-power portable and battery-backed applications |
| Power-down Current | 1µA typical - reduces standby power in always-on embedded controllers |
| Erase Endurance | 100,000 program/erase cycles - ensures long-term reliability in firmware update scenarios |
| Data Retention | 20 years at +25°C - meets industrial lifecycle requirements for unattended operation |
Pinout & Package
W25P20VSNIG is housed in an 8-pin SOIC package with 150-mil body width (Winbond package code SN). Pin assignments are standardized across the W25P family and validated for PCB layout compatibility with legacy NexFlash NX25P devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 /CS | Chip Select Input | Active-low enable: high = device deselected (DO high-Z); low = instruction/data accepted |
| 2 DO | Serial Data Output | Tri-state output: data shifted out on CLK falling edge; high-Z when /CS high or /HOLD active |
| 3 /WP | Write Protect Input | Hardware lock for Status Register: low = blocks SR writes if SRP=1; no effect if SRP=0 |
| 4 GND | Ground Reference | Signal and power return path; must be low-impedance for stable SPI timing and noise immunity |
| 5 DI | Serial Data Input | Data/instructions latched on CLK rising edge; MSB-first protocol required |
| 6 CLK | Serial Clock Input | Timing reference for all SPI transfers; supports Modes 0 (CLK idle low) and 3 (CLK idle high) |
| 7 /HOLD | Hold Input | Pauses ongoing SPI transaction while /CS remains low; allows bus arbitration without restart |
| 8 VCC | Power Supply | 2.7V–3.6V single supply; requires local decoupling capacitor per datasheet layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Bottom Boot Sector Organization | Enables secure boot code storage in lowest-addressed sector, preventing accidental overwrite during firmware updates |
| Hardware + Software Write Protection | Combines /WP pin control with programmable BP1/BP0 and SRP bits to protect partial or full memory array |
| Page Program (≤256 bytes) | Enables fine-grained firmware patching without erasing entire sectors - reduces update latency and wear |
| Sector Erase (64KB) | Allows targeted reprogramming of functional modules (e.g., communication stack, UI assets) independently |
| Manufacturer & Device ID Readback | Supports runtime verification of correct Flash part presence and version during system initialization |
Applications
| Firmware Storage | Data Logging |
|---|---|
|
Use Scenario: Storing bootloader and application firmware in resource-constrained MCU systems with no parallel bus interface. IC Role / Device Role / Timing Role: Non-volatile code storage accessed via SPI during cold boot and OTA updates. Use Value: Enables reliable execution from external memory using only four MCU GPIOs (CLK, /CS, DI, DO), reducing BOM cost vs. parallel NOR Flash. |
Use Scenario: Capturing sensor readings, error logs, or configuration history in industrial monitoring nodes operating for months on battery. IC Role / Device Role / Timing Role: Persistent data sink with byte-addressable writes and sector-erase granularity for wear leveling. Use Value: 100,000 erase cycles and 20-year retention ensure integrity over extended field deployment without refresh. |
| Consumer Electronics UI Assets | Medical Device Configuration |
|
Use Scenario: Hosting display bitmaps, audio prompts, and language strings in smart home hubs and portable audio players. IC Role / Device Role / Timing Role: Read-optimized storage for static assets loaded on demand via Fast Read (40MHz). Use Value: 40MHz read speed supports real-time UI rendering without frame stutter; SOIC-8 footprint fits compact PCB layouts. |
Use Scenario: Storing calibrated sensor parameters, user preferences, and regulatory audit trails in Class II medical instruments. IC Role / Device Role / Timing Role: Secure configuration store with hardware write protection (/WP + SRP) to prevent unauthorized modification. Use Value: Dual-layer protection (pin + register) satisfies IEC 62304 software safety requirements for critical data integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| W25Q20JVSSIQ | Same density (2M-bit), but newer W25Q family: 104MHz Quad SPI support, smaller 8-pin SOIC 208-mil package, enhanced security registers | Requires Quad SPI controller support; not drop-in for legacy dual-I/O or standard SPI-only designs | Select if migrating to higher-speed interfaces and need future-proofing; verify /HOLD and /WP signal compatibility |
| NX25P20ANIG | Direct predecessor: identical pinout, timing, and instruction set; manufactured by NexFlash pre-acquisition by Winbond | Same functional behavior and PCB layout; may have different lot traceability and RoHS compliance documentation | Use for legacy design continuity where Winbond sourcing is constrained; verify qualification status with distributor |
Compared with W25P20VSNIG, W25Q20JVSSIQ offers faster throughput and modern feature set but requires hardware/firmware changes, while NX25P20ANIG provides exact functional equivalence with potential supply chain trade-offs in documentation and support.
Availability
W25P20VSNIG is available at Aetrix Electronics and suitable for firmware storage, data logging, and UI asset hosting requiring stable component supply across industrial, medical, and consumer electronics programs.
Supply support for W25P20VSNIG 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 communications ICs since 1987.
The W25P series was designed as a pin- and instruction-compatible replacement for NexFlash Serial Flash, targeting cost-sensitive embedded systems needing reliable, low-pin-count non-volatile storage.
FAQ
What is the maximum clock frequency supported by W25P20VSNIG for Fast Read operations?
The W25P20VSNIG supports up to 40MHz for Fast Read (0Bh) operations, enabling high-throughput data retrieval in burst mode. This timing is specified under standard operating conditions (2.7V–3.6V, -40°C to +85°C) and requires proper signal integrity on the CLK line. Standard Read (03h) operates at up to 33MHz. Both modes use the same SPI Mode 0 or 3 configuration.
Does W25P20VSNIG support hardware write protection independent of software configuration?
Yes, W25P20VSNIG supports hardware write protection via the /WP pin in conjunction with the Status Register Protect (SRP) bit. When SRP = 1 and /WP is driven low, writes to the status register (including BP bits) are blocked. This provides tamper-resistant configuration locking without relying on firmware execution, making it suitable for safety-critical or secure boot applications.
How many sectors does W25P20VSNIG have, and what is the erase granularity?
W25P20VSNIG contains 4 erasable sectors, each 64KB (512K-bit) in size, corresponding to addresses 000000h–03FFFFh. Sector Erase (D8h) targets one 64KB block at a time, while Chip Erase (C7h) clears the full 2M-bit array in approximately 3 seconds. Page Program (02h) allows writing up to 256 bytes per operation within any sector.
Is W25P20VSNIG pin-compatible with earlier NexFlash NX25P20 devices?
Yes, W25P20VSNIG is fully pin-compatible and functionally identical to the NexFlash NX25P20ANIG, including identical SOIC-8 pinout, timing specifications, instruction set, and electrical characteristics. Winbond explicitly states full compatibility in the datasheet, enabling direct replacement without PCB or firmware changes.
What is the factory default state of the Block Protect bits in W25P20VSNIG?
The factory default state of the Block Protect bits (BP1, BP0) in W25P20VSNIG is 00, meaning no memory sectors are protected - the entire 2M-bit array is writable upon power-up. The Status Register Protect (SRP) bit also defaults to 0, so the /WP pin has no effect on status register writes until SRP is explicitly set to 1 via Write Status Register (01h) instruction.
W25P20VSNIG 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:
- 2Mbit
- Memory Organization:
- 256K 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
W25P20VSNIG FAQ
1.How can I place an order for W25P20VSNIG through Aetrix?
Please submit a Request for Quotation (RFQ) for W25P20VSNIG 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 W25P20VSNIG reliable?
The price and inventory of W25P20VSNIG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for W25P20VSNIG is usually 5 days.
3.What payment methods are accepted for W25P20VSNIG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for W25P20VSNIG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for W25P20VSNIG?
W25P20VSNIG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your W25P20VSNIG 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 W25P20VSNIG?
For technical support, including W25P20VSNIG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your W25P20VSNIG requirements.
6.How does Aetrix verify that W25P20VSNIG is sourced from the original manufacturer or authorized distributors?
All W25P20VSNIG 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 W25P20VSNIG meets industry standards.
7.What is the process for return or replacement of W25P20VSNIG?
All W25P20VSNIG units undergo pre-shipment inspection (PSI). If there is an issue with W25P20VSNIG, 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 W25P20VSNIG part is unused and in its original packaging.
Return procedure for W25P20VSNIG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
W25P20VSNIG Tags
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