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Winbond Electronics Corporation W25Q256JWEIQ
- Part No.:
- W25Q256JWEIQ
- Manufacturer:
- Winbond Electronics Corporation
- Category:
- Memory
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
W25Q256JWEIQ.pdf
- Description:
- IC FLASH 256MBIT SPI/QUAD 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,119
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Product details
Overview
W25Q256JWEIQ from Winbond is a 1.8V, 256M-bit (32MB) serial NOR flash memory supporting standard, dual, and quad SPI interfaces with up to 133MHz clock frequency and 4-byte addressing mode. It features uniform 4KB sectors, 64KB blocks, 100K program-erase cycles, and 20-year data retention. Used for XIP code execution, firmware storage, and parameter logging in industrial embedded systems.
For engineers reviewing the W25Q256JWEIQ datasheet, W25Q256JWEIQ pinout, W25Q256JWEIQ application, or W25Q256JWEIQ equivalent, key selection considerations include its 1.7–1.95V supply range, /RESET pin availability in SOIC/TFBGA packages, Quad Enable (QE) bit dependency for IO2/IO3 functionality, and hardware write-protection via /WP and /HOLD pins.
Technical Context
The W25Q256JWEIQ implements a flexible SPI command set supporting 3- and 4-byte address modes, with dedicated instructions for sector/block/chip erase, page program, fast read (up to 532MB/s equivalent via Quad I/O), and security register access. Its status registers include volatile/non-volatile BP bits, QE, ADS/ADP, DRV0/DRV1, and LB OTP locks.
It integrates JEDEC-compliant SFDP register, 64-bit unique ID, three 256-byte security registers with OTP protection, and supports erase/program suspend/resume. The device uses internal high-voltage generators for programming and erasing, eliminating need for external VPP.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256 M-bit (32 MB), organized as 131,072 × 256-byte pages |
| Supply Voltage | 1.7 V to 1.95 V - enables low-power operation in battery-backed or energy-constrained industrial designs |
| Max Clock Frequency | 133 MHz for Quad I/O - delivers 532 MB/s effective throughput using Fast Read Quad I/O (6Bh/6Ch) |
| Erase Granularity | 4 KB sectors, 32 KB & 64 KB blocks - supports fine-grained firmware partitioning and OTA update management |
| Endurance & Retention | 100,000 program-erase cycles; >20 years data retention at +85°C - suitable for long-life industrial deployments |
| Operating Temperature | −40°C to +105°C (Industrial Plus grade) - validated for extended thermal environments without derating |
| Security Features | Three 256-byte OTP-lockable security registers, 64-bit unique ID, SFDP, and individual sector lock/unlock (36h/39h) |
Pinout & Package
W25Q256JWEIQ is supplied in an 8-pad WSON 6×5-mm package (Package Code P), with exposed pad for thermal dissipation. Pin functions are defined per JEDEC-standard SPI interface with dual/quad I/O capability enabled via Status Register-2 QE bit.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| /CS | Chip Select Input | Active-low enable; places DO/IO pins in high-Z when deasserted; required to transition high→low before new instruction acceptance |
| DI (IO0) | Data Input / Quad I/O 0 | Primary input for standard/dual SPI; becomes bidirectional IO0 in dual/quad mode when QE=1 |
| DO (IO1) | Data Output / Quad I/O 1 | Primary output for standard SPI; becomes bidirectional IO1 in dual/quad mode when QE=1 |
| /WP (IO2) | Write Protect Input / Quad I/O 2 | Hardware write-protection enable (active low); repurposed as IO2 in quad mode when QE=1 |
| /HOLD (IO3) | Hold Input / Quad I/O 3 | Pauses ongoing SPI transfer; repurposed as IO3 in quad mode when QE=1; not available in quad configuration |
| CLK | Serial Clock Input | Edge-triggered timing source for all SPI operations; supports up to 133 MHz in quad I/O mode |
| VCC | Power Supply | 1.7–1.95 V core supply; decoupling capacitor required per layout guidelines |
| GND | Ground Reference | Signal and power ground reference; tied to exposed pad on WSON package |
Key Features
| Feature | Design Value |
|---|---|
| Quad SPI with 133 MHz clock | Enables 532 MB/s effective read bandwidth - replaces parallel NOR in space-constrained designs without sacrificing speed |
| 4-byte addressing mode | Supports >16 MB address space via B7h/E9h commands - essential for full 32 MB utilization beyond 3-byte limit |
| Erase/Program Suspend & Resume | Allows background operation interruption and resumption - critical for real-time systems requiring deterministic latency |
| Dedicated hardware /RESET pin | Available in SOIC/TFBGA variants; forces immediate power-on reset regardless of internal state - improves system recovery reliability |
| OTP-locked security registers | Three 256-byte regions with one-time-programmable locks - secures cryptographic keys, calibration data, or device identity |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot Image |
|---|---|
Use Scenario: Storing boot firmware and field-upgradable application code in programmable logic controllers operating continuously in factory environments. IC Role / Device Role / Timing Role: Non-volatile code storage with XIP-capable Quad SPI interface enabling direct execution from flash without RAM copy. Use Value: 20-year data retention and −40°C to +105°C rating ensure firmware integrity across decades of unattended operation in harsh thermal conditions. |
Use Scenario: Holding certified boot loader and diagnostic firmware in Class II medical imaging equipment requiring secure, tamper-resistant storage. IC Role / Device Role / Timing Role: Secure firmware repository with OTP-locked security registers for storing cryptographic keys used during secure boot validation. Use Value: 64-bit unique ID and SFDP register support enable traceability and automated configuration detection during manufacturing and service calibration. |
| Automotive ADAS Camera Module | Smart Energy Meter Calibration Data |
Use Scenario: Storing image processing firmware and runtime configuration parameters in automotive surround-view camera modules subject to AEC-Q100 stress testing. IC Role / Device Role / Timing Role: High-reliability code and parameter storage with hardware write-protection (/WP pin) preventing accidental corruption during vehicle power cycling. Use Value: 100K endurance cycles and 4KB sector granularity allow frequent over-the-air updates to vision algorithms while preserving calibration data in protected sectors. |
Use Scenario: Retaining metrology calibration constants, tariff tables, and tamper-event logs in utility-grade smart electricity meters deployed for 15+ years. IC Role / Device Role / Timing Role: Long-term parameter archive with top/bottom block protection (TB bit) and complement array protection (CMP bit) to prevent unauthorized modification. Use Value: Non-volatile BP bits and SRP/SRL locking ensure calibration data remains immutable even if host MCU is compromised or reprogrammed. |
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 |
|---|---|---|---|
| MX25L25645GMI-10G | 3V supply (2.7–3.6V); no /RESET pin in 8-pin SOIC/WSON; max 104MHz clock | Lacks hardware reset and quad I/O performance; unsuitable for 1.8V systems or high-throughput XIP | Select only if legacy 3V design and lower bandwidth are acceptable |
| S25FL256SAGMFI000 | 1.8V supply; includes built-in ECC and configurable latency; supports octal DDR mode | Higher pin count (16-pin SOIC/WSON); requires additional configuration for legacy SPI compatibility | Prefer for safety-critical applications needing error correction, but adds layout complexity |
Compared with MX25L25645GMI-10G and S25FL256SAGMFI000, the W25Q256JWEIQ offers optimal balance of 1.8V operation, quad I/O speed, compact 8-pin WSON packaging, and industrial-plus temperature support-making it ideal for new designs prioritizing footprint, power, and throughput without ECC overhead.
Availability
W25Q256JWEIQ is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, automotive ADAS, and smart metering applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for W25Q256JWEIQ 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, mobile DRAM, and code storage products for industrial, automotive, and consumer markets.
The W25Q256JW series is part of Winbond's high-performance SpiFlash family designed specifically for industrial-plus applications demanding extended temperature operation, robust security, and high-speed Quad I/O interface compatibility.
FAQ
What is the supply voltage range for W25Q256JWEIQ?
The W25Q256JWEIQ operates from 1.7 V to 1.95 V. This narrow 1.8V nominal range ensures compatibility with modern low-power microcontrollers and PMICs while maintaining sufficient noise margin. Operation outside this range may cause undefined behavior or permanent damage. The W25Q256JWEIQ does not support 3.3V or dual-voltage operation.
Does W25Q256JWEIQ support hardware reset, and how is it implemented?
The W25Q256JWEIQ does not include a dedicated /RESET pin in its 8-pad WSON 6×5-mm package (Code P). Hardware reset is only available in SOIC-16 and TFBGA packages. For W25Q256JWEIQ, system-level reset must be handled via software commands (66h + 99h) or power cycle. The /HOLD pin cannot substitute for hardware reset.
How do I enable Quad SPI mode on W25Q256JWEIQ?
Quad SPI mode is enabled by setting the Quad Enable (QE) bit in Status Register-2 (SR2) using instruction 31h. Once QE = 1, the /WP and /HOLD pins become IO2 and IO3 respectively. The W25Q256JWEIQ requires this non-volatile configuration step before issuing Quad I/O commands like 6Bh or EBh. Default power-up state is standard SPI.
What package type is used for W25Q256JWEIQ?
W25Q256JWEIQ uses the 8-pad WSON 6×5-mm package (Package Code P) with an exposed thermal pad. This RoHS-compliant, near-chip-scale package provides excellent thermal performance and minimal PCB footprint-ideal for space-constrained industrial and portable designs where SOIC or BGA are impractical.
Can W25Q256JWEIQ store more than 16 MB of data?
Yes. The W25Q256JWEIQ has 32 MB (256 M-bit) capacity and supports 4-byte addressing mode via Enter 4-Byte Address Mode (B7h) instruction. Without enabling 4-byte mode, only the lower 16 MB (3-byte address space) is accessible. Full 32 MB utilization requires explicit 4-byte mode activation and use of 4-byte-addressed instructions (e.g., 13h, 3Ch, 6Ch).
W25Q256JWEIQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Winbond Electronics Corporation
- Series:
- SpiFlash®
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH - NOR
- Memory Size:
- 256Mbit
- Memory Organization:
- 32M x 8
- Memory Interface:
- SPI - Quad I/O
- Clock Frequency:
- 133 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 6 ns
- Voltage - Supply:
- 1.7V ~ 1.95V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (8x6)
W25Q256JWEIQ FAQ
1.How can I place an order for W25Q256JWEIQ through Aetrix?
Please submit a Request for Quotation (RFQ) for W25Q256JWEIQ 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 W25Q256JWEIQ reliable?
The price and inventory of W25Q256JWEIQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for W25Q256JWEIQ is usually 5 days.
3.What payment methods are accepted for W25Q256JWEIQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for W25Q256JWEIQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for W25Q256JWEIQ?
W25Q256JWEIQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your W25Q256JWEIQ 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 W25Q256JWEIQ?
For technical support, including W25Q256JWEIQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your W25Q256JWEIQ requirements.
6.How does Aetrix verify that W25Q256JWEIQ is sourced from the original manufacturer or authorized distributors?
All W25Q256JWEIQ 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 W25Q256JWEIQ meets industry standards.
7.What is the process for return or replacement of W25Q256JWEIQ?
All W25Q256JWEIQ units undergo pre-shipment inspection (PSI). If there is an issue with W25Q256JWEIQ, 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 W25Q256JWEIQ part is unused and in its original packaging.
Return procedure for W25Q256JWEIQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
W25Q256JWEIQ Tags
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