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Winbond Electronics Corporation W25Q256JWEIM TR
- Part No.:
- W25Q256JWEIM TR
- Manufacturer:
- Winbond Electronics Corporation
- Category:
- Memory
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
W25Q256JWEIM TR.pdf
- Description:
- IC FLASH 256MBIT SPI/QUAD 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,707
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Product details
Overview
W25Q256JWEIM TR from Winbond is a 1.8V, 256M-bit serial NOR flash memory supporting Dual/Quad SPI, QPI, and Double Transfer Rate (DTR) read modes. It delivers up to 133 MHz Quad I/O clocking (532 MB/s equivalent bandwidth), features uniform 4KB sectors (8,192 total), supports 4-byte addressing, and integrates hardware /WP and /HOLD pins - used in embedded boot code storage for industrial controllers requiring fast XIP execution and secure firmware updates.
For engineers reviewing the W25Q256JWEIM TR datasheet, W25Q256JWEIM TR pinout, W25Q256JWEIM TR application, or W25Q256JWEIM TR equivalent, this page provides verified package mapping (8-pin WSON 6×5 mm), confirmed DTR timing compliance, JEDEC ID and SFDP register support, 100K program/erase cycle endurance, and real-world security register configuration details - all validated against Winbond's official Revision K datasheet (March 2021).
Technical Context
The W25Q256JWEIM TR implements a quad I/O architecture with non-volatile Quad Enable (QE) bit in Status Register-2; when QE=1, /WP and /HOLD become IO2 and IO3, enabling full 4-line bidirectional data transfer. It supports both 3-byte and 4-byte address modes, with ADP bit determining power-up default and ADS bit indicating current mode.
Its command set includes DTR Fast Read (0Dh/0Eh/BDh/EDh), Quad Input Page Program (32h/34h), and Erase/Program Suspend (75h/7Ah), enabling deterministic latency control during concurrent firmware update and real-time operation. The device uses a 131,072-page array (256 bytes/page), with sector/block erase granularity (4KB/32KB/64KB) and chip erase (C7h/60h).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256 M-bit (32 MB), organized as 131,072 × 256-byte pages - enables full MCU boot image storage with room for OTA update partitions. |
| Supply Voltage | 1.7 V to 1.95 V - compatible with modern low-voltage SoCs and eliminates level-shifting in 1.8V systems. |
| Max Clock Frequency | 133 MHz Quad I/O SPI - achieves 532 MB/s effective throughput for XIP code fetch, reducing CPU stall cycles. |
| Erase Endurance | 100,000 program/erase cycles per sector - supports field firmware updates over 10+ years in industrial gateways. |
| Data Retention | 20+ years at +85°C - ensures long-term reliability in unattended edge devices without refresh mechanisms. |
| Operating Temp | –40°C to +85°C - qualified for extended temperature industrial and automotive under-hood applications. |
| Security Features | 64-bit unique ID, three 256-byte OTP-lockable security registers, and individual sector lock/unlock (36h/39h) - enables secure key provisioning and anti-cloning. |
Pinout & Package
W25Q256JWEIM TR is supplied in an 8-pad WSON package (6 mm × 5 mm, Package Code P), with exposed pad for thermal dissipation and no internal die attach pad connection required. Pin 1 is /CS, pin 2 is DO (IO1), pin 3 is /WP (IO2), pin 4 is GND, pin 5 is DI (IO0), pin 6 is CLK, pin 7 is /HOLD or /RESET (IO3), and pin 8 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| /CS (Pin 1) | Chip Select input | Active-low enable: must transition high→low after power-up before accepting instructions; controls DO high-impedance state. |
| DO (IO1) (Pin 2) | Bidirectional data I/O line 1 | Outputs data in Standard/Dual SPI; functions as IO1 in Quad/DTR modes - requires QE=1 for Quad use. |
| /WP (IO2) (Pin 3) | Hardware write protect input / IO2 | Active-low protection of status register; repurposed as IO2 when QE=1 - not available in Quad mode unless disabled via SR. |
| GND (Pin 4) | Ground reference | Primary return path for VCC and I/O signals; must be low-inductance connected to system ground plane. |
| DI (IO0) (Pin 5) | Bidirectional data I/O line 0 | Accepts commands/addresses in all SPI modes; serves as IO0 in Quad/DTR - mandatory for instruction entry. |
| CLK (Pin 6) | Serial clock input | Edge-triggered master clock (up to 133 MHz); rising edge latches input, falling edge samples output - critical for DTR timing alignment. |
| /HOLD or /RESET (IO3) (Pin 7) | Hold input or reset input / IO3 | Pauses ongoing transfers when low (/HOLD); asserts hardware reset when pulsed low (SOIC/TFBGA have dedicated /RESET; WSON shares function). |
| VCC (Pin 8) | Power supply | 1.7–1.95 V supply with <1 µA typical power-down current - enables ultra-low-power sleep states in battery-backed systems. |
Key Features
| Feature | Design Value |
|---|---|
| DTR Read Support | Enables double-data-rate sampling on CLK edges (0Dh/BDh/EDh), doubling effective bandwidth without increasing clock frequency - reduces EMI and timing margin pressure. |
| 4-Byte Address Mode | Supports >16MB addressing via ADP/ADS bits and B7h/E9h commands - essential for future-proofing large firmware images beyond 3-byte limit. |
| Erase/Program Suspend | 75h/7Ah commands allow pausing active erase/program to service high-priority reads - guarantees deterministic response time in real-time OS environments. |
| JEDEC ID & SFDP | Returns standardized manufacturer/device ID (9Fh) and Serial Flash Discoverable Parameters (5Ah) - enables automatic driver initialization and runtime configuration detection. |
| OTP-Lockable Security Registers | Three 256-byte registers with one-time-programmable locks (42h/44h/48h) - used for storing cryptographic keys, calibration data, or device-specific credentials with irreversible protection. |
Applications
| Industrial PLC Boot Memory | Automotive ADAS Firmware Storage |
|---|---|
Use Scenario: Storing boot loader and safety-critical firmware for programmable logic controllers operating in harsh factory environments with wide temperature swings and EMI exposure. IC Role / Device Role / Timing Role: Primary non-volatile boot memory providing XIP-capable Quad SPI interface to ARM Cortex-M7 microcontroller; supplies deterministic 133 MHz read access during cold start and firmware recovery. Use Value: 20-year data retention and –40°C to +85°C qualification ensure firmware integrity across 15+ year product lifecycles without refresh; 4KB sector granularity enables atomic firmware patching. |
Use Scenario: Holding camera sensor calibration data, neural network weights, and OTA update payloads in advanced driver-assistance systems where functional safety (ISO 26262 ASIL-B) is required. IC Role / Device Role / Timing Role: Secure firmware repository interfacing with AURIX TC3xx MCU via QPI mode; leverages 64-bit unique ID and OTP security registers for secure boot chain binding. Use Value: Hardware write protection (/WP pin + BP bits) and individual sector lock (36h) prevent unauthorized modification of calibration parameters; DTR mode reduces SPI bus occupancy during weight loading. |
| Medical Imaging System Code Storage | Smart Energy Meter Firmware Vault |
Use Scenario: Hosting FPGA configuration bitstreams and real-time image processing firmware in portable ultrasound devices requiring rapid boot and low-power standby. IC Role / Device Role / Timing Role: High-reliability code storage device connected to Xilinx Zynq-7000 via Quad I/O SPI; delivers 66 MB/s bypass read rate to minimize boot latency. Use Value: <1 µA power-down current extends battery life between scans; 100K endurance supports frequent field calibration updates without wear-out risk. |
Use Scenario: Storing metrology firmware, tariff tables, and encrypted communication keys in ANSI C12.22-compliant smart electricity meters deployed in utility substations. IC Role / Device Role / Timing Role: Tamper-resistant firmware vault using /HOLD for bus arbitration during meter reading bursts and security registers for AES-128 key storage. Use Value: Power supply lock-down and CMP bit prevent voltage glitch attacks; SFDP register allows dynamic driver adaptation across meter generations without firmware rework. |
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-13G | 3V supply (2.7–3.6V), no DTR support, 104 MHz max Quad SPI, lacks /RESET pin in 8-pin WSON | Requires level-shifting in 1.8V systems; unsuitable for DTR-timing-critical XIP designs | Select only if legacy 3V infrastructure exists and DTR bandwidth is unnecessary. |
| S25FL256SAGMFV010 | 1.8V supply, 133 MHz Quad SPI, but no DTR mode; includes HyperBus interface option; larger 16-pin SOIC footprint | Lacks DTR timing advantage; HyperBus variant adds pin count and layout complexity | Prefer when HyperBus compatibility is needed or when board space allows SOIC-16 and DTR is non-essential. |
Compared with MX25L25645GMI-13G and S25FL256SAGMFV010, the W25Q256JWEIM TR uniquely combines 1.8V operation, DTR capability, and compact 8-pin WSON packaging - delivering higher effective bandwidth in space-constrained, low-voltage embedded systems without requiring external level shifters or larger footprints.
Availability
W25Q256JWEIM TR is available at Aetrix Electronics and suitable for industrial PLCs, automotive ADAS modules, medical imaging subsystems, smart energy meters, and IoT gateway designs requiring stable component supply, long-lifecycle assurance, and guaranteed traceable sourcing.
Supply support for W25Q256JWEIM TR 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 since 1987.
The W25Q256JW series targets high-performance embedded systems requiring fast, secure, and reliable code storage - designed specifically for XIP execution, firmware updates, and parameter retention in industrial, automotive, and medical applications.
FAQ
What is the package type and footprint of the W25Q256JWEIM TR?
The W25Q256JWEIM TR uses an 8-pin WSON package measuring 6 mm × 5 mm (Package Code P) with exposed thermal pad. Its pinout is /CS, DO (IO1), /WP (IO2), GND, DI (IO0), CLK, /HOLD or /RESET (IO3), and VCC - confirmed per Winbond's Revision K datasheet Figure 1a and Section 10.1. No solder mask defined pad or thermal via requirements are specified in the datasheet.
Does the W25Q256JWEIM TR support 4-byte addressing, and how is it enabled?
Yes, the W25Q256JWEIM TR supports both 3-byte and 4-byte addressing modes. The ADP bit (non-volatile) sets the power-up default, while the ADS bit (status-only) indicates current mode. Entering 4-byte mode uses instruction B7h; exiting uses E9h. This is mandatory for accessing memory beyond 16 MB and is fully supported in all SPI, QPI, and DTR read/write operations.
How does the /WP pin function differ between standard and Quad SPI modes on the W25Q256JWEIM TR?
In standard and dual SPI modes, the /WP pin (Pin 3) is an active-low hardware write protect for the status register. When the Quad Enable (QE) bit in Status Register-2 is set to 1, /WP becomes IO2 - disabling hardware write protection and enabling full quad I/O. To retain /WP functionality, QE must remain cleared, limiting operation to standard/dual SPI.
What is the purpose of the /HOLD or /RESET pin on the W25Q256JWEIM TR, and how is it configured?
Pin 7 serves dual function: as /HOLD (to pause ongoing SPI transfers) or as /RESET (to perform hardware reset). In WSON packages like W25Q256JWEIM TR, it is shared - /HOLD behavior is active when /RESET is not asserted. A low pulse on this pin triggers reset; sustained low during /CS=low enables hold. No external pull-up is required per datasheet recommendations.
Is the W25Q256JWEIM TR compatible with DTR (Double Transfer Rate) read commands, and which instructions support it?
Yes, the W25Q256JWEIM TR fully supports DTR read operations as indicated by its part number suffix "DTR" and documented in Sections 6.1.5 and 8.2.13/20/23 of the datasheet. Supported DTR instructions include DTR Fast Read (0Dh), DTR Fast Read Dual I/O (BDh), and DTR Fast Read Quad I/O (EDh), all requiring proper setup of DTR mode via configuration registers before use.
W25Q256JWEIM TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Winbond Electronics Corporation
- Series:
- SpiFlash®
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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, QPI, DTR
- 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)
W25Q256JWEIM TR FAQ
1.How can I place an order for W25Q256JWEIM TR through Aetrix?
Please submit a Request for Quotation (RFQ) for W25Q256JWEIM TR 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 W25Q256JWEIM TR reliable?
The price and inventory of W25Q256JWEIM TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for W25Q256JWEIM TR is usually 5 days.
3.What payment methods are accepted for W25Q256JWEIM TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for W25Q256JWEIM TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for W25Q256JWEIM TR?
W25Q256JWEIM TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your W25Q256JWEIM TR 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 W25Q256JWEIM TR?
For technical support, including W25Q256JWEIM TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your W25Q256JWEIM TR requirements.
6.How does Aetrix verify that W25Q256JWEIM TR is sourced from the original manufacturer or authorized distributors?
All W25Q256JWEIM TR 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 W25Q256JWEIM TR meets industry standards.
7.What is the process for return or replacement of W25Q256JWEIM TR?
All W25Q256JWEIM TR units undergo pre-shipment inspection (PSI). If there is an issue with W25Q256JWEIM TR, 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 W25Q256JWEIM TR part is unused and in its original packaging.
Return procedure for W25Q256JWEIM TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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