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Winbond Electronics Corporation W25X40BVSSIG
- Part No.:
- W25X40BVSSIG
- Manufacturer:
- Winbond Electronics Corporation
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
W25X40BVSSIG.pdf
- Description:
- IC FLASH 4MBIT SPI 104MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,079
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Product details
Overview
W25X40BVSSIG from Winbond is a 4M-bit (512KB) serial NOR flash memory IC with SPI interface, supporting standard, dual-output, and dual I/O SPI modes up to 104 MHz clock frequency. It features uniform 4KB sectors, 32KB and 64KB blocks, page programming (≤1 ms), and operates on single 2.7–3.6V supply with 4 mA active and 1 µA power-down current. It is used for code storage, firmware boot, and parameter retention in space-constrained embedded systems.
For engineers reviewing the W25X40BVSSIG datasheet, W25X40BVSSIG pinout, W25X40BVSSIG application, or W25X40BVSSIG equivalent, key selection considerations include sector granularity (4KB), dual I/O read throughput (208 Mbps), hardware write protection via /WP pin, JEDEC ID compatibility (EFh/3013h), and SOIC-208-mil package compatibility with legacy PCB footprints.
Technical Context
The W25X40BVSSIG implements a SPI-compatible command set including Standard SPI (DI/DO), Fast Read Dual Output (3Bh), and Fast Read Dual I/O (BBh), enabling up to 208 Mbps effective data rate. Its internal architecture includes a 256-byte page buffer, status register with BUSY/WEL/BP/TB/SRP bits, and high-voltage generators for erase/program operations.
It supports four erase granularities - page (256 B), sector (4 KB), 32 KB block, and chip erase - with ≥100,000 program/erase cycles and >20-year data retention. Write protection is enforced via software (Status Register BP/TB/SRP bits) and hardware (/WP pin low disables status register writes when SRP=1).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 M-bit (512 KB), organized as 2,048 × 256-byte pages |
| Interface | SPI with Standard / Dual Output / Dual I/O modes; supports Mode 0 and Mode 3 |
| Max Clock Frequency | 104 MHz; enables 208 Mbps read rate using Fast Read Dual Output (3Bh) |
| Erase Granularity | 4 KB sectors (128 total), 32 KB blocks (64 total), 64 KB blocks (8 total), full chip |
| Write Endurance | ≥100,000 program/erase cycles per sector |
| Data Retention | ≥20 years at +25°C; validated under JEDEC JESD22-A117 |
| Supply Voltage | 2.7 V to 3.6 V; no external voltage regulators required in 3.3 V systems |
| Operating Temperature | –40°C to +85°C; suitable for industrial-grade embedded deployment |
Pinout & Package
W25X40BVSSIG is packaged in an 8-pin SOIC 208-mil (package code SS), with gull-wing leads, 1.27 mm pitch, and RoHS-compliant matte tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 /CS | Chip Select Input | Active-low enable; must transition high→low before instruction acceptance; controls DO high-impedance state |
| 2 DO (IO1) | Serial Data Output / Bidirectional I/O | Output-only in Standard SPI; bidirectional in Dual SPI (used for data read/write on falling edge of CLK) |
| 3 /WP | Hardware Write Protect Input | Active-low; locks Status Register writes when SRP=1; enables top/bottom array protection control |
| 4 GND | Ground Reference | Primary return path for VCC and all I/O signals; requires low-impedance PCB plane connection |
| 5 DIO (IO0) | Serial Data Input / Bidirectional I/O | Input-only in Standard SPI; bidirectional in Dual SPI (used for instruction/address/data on rising edge of CLK) |
| 6 CLK | Serial Clock Input | Edge-triggered timing reference; supports Mode 0 (CLK idle low) and Mode 3 (CLK idle high) |
| 7 /HOLD | Hold Control Input | Active-low pause signal; suspends ongoing SPI transaction without resetting internal state; useful for multi-device bus sharing |
| 8 VCC | Power Supply | 2.7–3.6 V main supply; decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Uniform 4 KB Sectors | Enables fine-grained firmware partitioning and over-the-air update safety by isolating critical bootloader sections |
| Dual I/O SPI Support | Reduces instruction overhead and enables true XIP (execute-in-place) for non-speed-critical code without external RAM buffering |
| Hardware + Software Write Protection | Combines /WP pin control with SRP/BP/TB bits to prevent accidental erase during field firmware updates or brown-out conditions |
| Continuous Read Mode | Allows linear address increment with only 8 clocks per address byte, minimizing SPI controller CPU load during bulk reads |
| JEDEC Manufacturer & Device ID | Provides deterministic identification (EFh/3013h) for automated BOM validation and factory programming verification |
| Power-down Instruction (B9h) | Reduces standby current to 1 µA typical; essential for battery-powered IoT nodes requiring long sleep intervals |
Applications
| Industrial PLC Firmware Storage | Automotive Infotainment Boot Code |
|---|---|
Use Scenario: Storing firmware images and configuration parameters in programmable logic controllers deployed in factory automation environments with wide temperature swings and EMI exposure. IC Role / Device Role / Timing Role: Non-volatile code storage device providing SPI-based boot image access during cold start; supports fast read dual I/O for rapid bootloader execution. Use Value: 4 KB sector granularity allows independent update of communication stack without erasing safety-critical motion control routines; -40°C to +85°C rating ensures reliability in uncontrolled cabinet environments. |
Use Scenario: Holding boot firmware and UI assets for head-unit microcontrollers in automotive infotainment systems requiring AEC-Q100 alignment and secure update capability. IC Role / Device Role / Timing Role: Primary SPI flash for U-Boot initialization and kernel image loading; leverages Fast Read Dual Output (3Bh) to meet boot-time latency targets. Use Value: Hardware write protection via /WP pin prevents corruption during vehicle battery transients; JEDEC ID (EFh/3013h) enables automated flash verification in production test fixtures. |
| Medical Diagnostic Device Parameter Memory | Smart Meter Firmware & Calibration Data |
Use Scenario: Retaining calibration coefficients, sensor offset tables, and regulatory audit logs in portable ultrasound and ECG devices subject to IEC 62304 software lifecycle requirements. IC Role / Device Role / Timing Role: Parameter storage IC with deterministic write endurance (>100k cycles) and 20-year data retention for Class II medical device certification. Use Value: Block protect bits (BP2–BP0 + TB) allow locking calibration sectors while permitting field-updatable UI language packs; SOIC-208-mil package supports manual rework in low-volume assembly. |
Use Scenario: Storing firmware, tariff tables, and metrology calibration constants in ANSI C12.20-certified smart electricity meters operating continuously for 15+ years. IC Role / Device Role / Timing Role: Long-life non-volatile memory for secure firmware storage and encrypted parameter updates over HAN/LAN interfaces. Use Value: Power-down mode (1 µA) minimizes self-discharge impact on backup supercapacitors; 4 KB sectors enable atomic OTA updates of tariff schedules without disrupting metering accuracy. |
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 |
|---|---|---|---|
| W25Q40EWSSIG | Successor generation: Quad SPI support, 133 MHz max clock, 2.3–3.6 V supply, enhanced security registers | Required for designs needing QSPI x4 data bus or secure boot key storage; not drop-in due to different instruction set and voltage range | Select W25Q40EWSSIG only if migrating to Quad SPI infrastructure or requiring hardware-based secure boot features. |
| AT25DF041A-SSH-T | Same density (4 M-bit), SOIC-208-mil, but supports only Standard/Dual SPI (no Dual I/O), max 85 MHz clock, 2.7–3.6 V | Lacks BBh instruction; lower max throughput (170 Mbps); no continuous read mode; identical pinout and voltage range | Acceptable for cost-sensitive designs where 208 Mbps read rate and XIP capability are not required; verified pin-compatible replacement. |
Compared with W25X40BVSSIG, W25Q40EWSSIG offers higher bandwidth and security but requires firmware changes, while AT25DF041A-SSH-T provides identical footprint and voltage compatibility at reduced performance-making it viable for legacy SPI-only systems with relaxed timing budgets.
Availability
W25X40BVSSIG is available at Aetrix Electronics and suitable for industrial PLCs, automotive infotainment systems, medical diagnostic instruments, and smart metering platforms requiring stable component supply across extended product lifecycles.
Supply support for W25X40BVSSIG 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 flash memory solutions for embedded, communications, and consumer applications.
The W25X series was designed specifically for cost-sensitive, space-constrained embedded systems requiring reliable code storage, fast boot times, and robust write protection-targeting industrial control, automotive telematics, and portable medical equipment.
FAQ
What is the maximum SPI clock frequency supported by the W25X40BVSSIG?
The W25X40BVSSIG supports a maximum SPI clock frequency of 104 MHz. This enables 208 Mbps effective read throughput when using the Fast Read Dual Output (3Bh) instruction. The device complies with SPI Modes 0 and 3, and timing parameters-including tCH and tCL-are fully specified in the AC Electrical Characteristics table of the August 2009 datasheet. Operation above 104 MHz is not guaranteed and may result in data corruption or command rejection.
Does the W25X40BVSSIG support Quad SPI (QSPI) interface?
No, the W25X40BVSSIG does not support Quad SPI. It supports Standard SPI (single I/O), Fast Read Dual Output (3Bh), and Fast Read Dual I/O (BBh) modes only. Quad SPI functionality was introduced in the successor W25Qxx family (e.g., W25Q40EW). Attempting to issue QSPI commands (e.g., 6BH, EBH) to the W25X40BVSSIG will result in undefined behavior or ignored instructions.
How many 4 KB sectors does the W25X40BVSSIG contain?
The W25X40BVSSIG contains 128 uniform 4 KB sectors, totaling 512 KB of addressable memory space (000000h–07FFFFh). Each sector can be independently erased using the Sector Erase (20h) instruction. This granularity enables selective firmware updates-for example, preserving bootloader code in one sector while updating application firmware in others-without full-chip erase cycles.
What is the purpose of the /HOLD pin on the W25X40BVSSIG?
The /HOLD pin on the W25X40BVSSIG provides a hardware-controlled pause function during active SPI transactions. When asserted low while /CS is low, it places the DO pin in high-impedance state and ignores further CLK and DIO activity, preserving internal state. This is especially valuable in multi-device SPI buses where priority interrupts require temporary bus arbitration-allowing the W25X40BVSSIG to resume exactly where it left off after /HOLD is deasserted.
Can the W25X40BVSSIG be used as a direct replacement for the W25X40CLSSIG?
No, the W25X40BVSSIG is not a direct replacement for the W25X40CLSSIG. While both are 4 M-bit SPI flash devices in SOIC-208-mil packages, the CL variant operates at 2.3–3.6 V and supports higher clock frequencies (up to 80 MHz standard, 104 MHz dual I/O), whereas the BV variant is rated for 2.7–3.6 V only. Voltage range mismatch and subtle timing differences make them non-interchangeable without board-level validation.
W25X40BVSSIG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Winbond Electronics Corporation
- Series:
- SpiFlash®
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 4Mbit
- Memory Organization:
- 512K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 104 MHz
- Write Cycle Time - Word, Page:
- 3ms
- 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
W25X40BVSSIG FAQ
1.How can I place an order for W25X40BVSSIG through Aetrix?
Please submit a Request for Quotation (RFQ) for W25X40BVSSIG 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 W25X40BVSSIG reliable?
The price and inventory of W25X40BVSSIG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for W25X40BVSSIG is usually 5 days.
3.What payment methods are accepted for W25X40BVSSIG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for W25X40BVSSIG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for W25X40BVSSIG?
W25X40BVSSIG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your W25X40BVSSIG 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 W25X40BVSSIG?
For technical support, including W25X40BVSSIG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your W25X40BVSSIG requirements.
6.How does Aetrix verify that W25X40BVSSIG is sourced from the original manufacturer or authorized distributors?
All W25X40BVSSIG 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 W25X40BVSSIG meets industry standards.
7.What is the process for return or replacement of W25X40BVSSIG?
All W25X40BVSSIG units undergo pre-shipment inspection (PSI). If there is an issue with W25X40BVSSIG, 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 W25X40BVSSIG part is unused and in its original packaging.
Return procedure for W25X40BVSSIG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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