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Winbond Electronics Corporation W25M121AWEIT TR
- Part No.:
- W25M121AWEIT TR
- Manufacturer:
- Winbond Electronics Corporation
- Category:
- Memory
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
W25M121AWEIT TR.pdf
- Description:
- IC FLASH 128MBIT SPI/QUAD 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,785
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Product details
Overview
W25M121AWEIT TR from Winbond is a 128Mb (2×64Mb) SpiStack® stacked flash memory combining two 64Mb NOR dies in a single WSON8 8×6mm package, supporting concurrent read-on-one-die + write/erase-on-another-die operation, SPI x1/x2/x4 interface, and Industrial temperature range (−40°C to +85°C), used in embedded systems requiring nonvolatile code+data storage with zero-interrupt firmware updates.
For engineers reviewing the W25M121AWEIT TR datasheet, W25M121AWEIT TR pinout, W25M121AWEIT TR application, or W25M121AWEIT TR equivalent, key selection criteria include dual-die concurrency support, 1.8V/3.0V VCC compatibility, Industrial-grade reliability, WSON8 8×6mm footprint, and backward compatibility with standard SpiFlash® command set.
Technical Context
The W25M121AWEIT TR implements homogeneous stacking of two identical 64Mb NOR flash dies, enabling true concurrent operations: while one die executes XIP-capable random-access reads for code execution, the other die performs page programming or sector erasure without stalling CPU fetches. This architecture eliminates wait states during background data writes.
It uses a quad-SPI (QSPI)–capable serial peripheral interface compliant with JEDEC JESD216, supports Continuous Read mode by default (BUF=0), and maintains full command-set compatibility with legacy Winbond SpiFlash® devices including status register layout and erase granularity (4KB sectors, 64KB blocks).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Total Density | 128Mb (2 × 64Mb NOR dies), enabling consolidated code+data storage in single footprint |
| Interface | SPI x1/x2/x4 with QPI mode; enables up to 40MB/s read throughput and reduces I/O count vs parallel NOR |
| Operating Voltage | 3.0V ±0.3V; compatible with legacy 3V system rails and simplifies power design vs dual-voltage solutions |
| Temperature Range | Industrial: −40°C to +85°C; qualified for deployment in routers, industrial HMIs, and automotive infotainment head units |
| Erase Granularity | 4KB sectors / 64KB blocks; allows fine-grained firmware patching and wear leveling across both dies |
| Package | WSON8 8×6mm (JEDEC MO-252); surface-mount, halogen-free, RoHS-compliant, footprint-compatible with W25Q128JV |
| Default Mode | Continuous Read enabled (BUF=0); eliminates need for dummy cycles in sequential instruction fetch scenarios |
Pinout & Package
W25M121AWEIT TR is housed in an 8-pin WSON (Wettable Flank Small Outline No-Lead) package measuring 8mm × 6mm, with exposed thermal pad on underside for enhanced thermal dissipation in high-duty-cycle applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 / /CS | Chip Select | Active-low enable for SPI command latching; supports multi-device daisy-chaining via shared SCLK/MOSI/MISO |
| 2 / DO (IO1) | Data Output / I/O 1 | Serial data output in standard SPI; bidirectional I/O pin in Dual/Quad modes for address/data transfer |
| 3 / WP# (IO2) | Write Protect / I/O 2 | Hardware write protection when low; functions as IO2 in Dual/Quad SPI for expanded bandwidth |
| 4 / GND | Ground | Reference return path for VCC and signal integrity; tied to thermal pad for thermal conduction |
| 5 / SI (IO0) | Serial Input / I/O 0 | Command/address/data input in standard SPI; bidirectional IO0 in Dual/Quad modes |
| 6 / SO (IO1) | Serial Output / I/O 1 | Read data output in standard SPI; reused as IO1 in Dual/Quad modes |
| 7 / HOLD# (IO3) | Hold Input / I/O 3 | Pauses ongoing SPI transaction without deselecting device; serves as IO3 in Quad mode |
| 8 / VCC | Power Supply | 3.0V core and I/O supply; requires local 1µF ceramic decoupling adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Homogeneous Dual-Die NOR Stack | Two independent 64Mb NOR dies sharing one SPI interface-enables simultaneous code execution and background data update |
| Concurrent Operation Support | Read from Die 0 while writing/erasing Die 1; eliminates firmware stall time during OTA updates or log writes |
| Backward-Compatible SpiFlash® Command Set | Identical opcodes, status register bits, and timing parameters as W25Q128JV-no driver or HAL changes required |
| Industrial Temperature Rating | Qualified from −40°C to +85°C with full performance spec compliance-suitable for uncooled industrial gateways |
| WSON8 8×6mm Green Package | Halogen-free, RoHS-compliant, wettable flank leads for automated optical inspection (AOI) and reliable reflow soldering |
Applications
| Industrial Gateway Firmware Storage | Automotive Infotainment Code+Data |
|---|---|
Use Scenario: Storing boot loader, OS kernel, and configuration database in a single compact flash device within space-constrained edge gateways. IC Role / Device Role / Timing Role: Primary nonvolatile memory providing XIP-capable code execution and atomic firmware update partitioning across two dies. Use Value: Concurrent read/write eliminates reboot requirement during field firmware upgrades-reducing downtime in critical infrastructure. | Use Scenario: Hosting navigation map data, UI assets, and real-time audio buffers in automotive head units operating across extended temperature ranges. IC Role / Device Role / Timing Role: Dual-die NOR flash serving as unified code+data storage with deterministic latency for safety-critical boot sequences. Use Value: 128Mb density fits full map datasets while Industrial temp rating ensures reliability in dashboard-mounted units. |
| Network Router Boot + Log Storage | Medical Imaging Device Configuration |
Use Scenario: Holding bootloader, Linux kernel, rootfs, and persistent syslog buffer in enterprise-grade wired/wireless routers. IC Role / Device Role / Timing Role: Single-package flash delivering concurrent access to separate logical partitions-one for read-only firmware, one for cyclic logging. Use Value: Eliminates need for separate NOR+NAND chips, reducing BOM count and PCB area by ~35% vs discrete solution. | Use Scenario: Storing calibration profiles, DICOM metadata templates, and regulatory audit logs in portable ultrasound and MRI control modules. IC Role / Device Role / Timing Role: High-reliability NOR-based storage ensuring bit-error-free retention of life-critical calibration data over 10+ years. Use Value: Homogeneous NOR stack guarantees >100K program/erase cycles per sector-meeting IEC 62304 Class C software requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar stacked NOR flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| W25Q128JVSIM | Single-die 128Mb SPI NOR; no concurrent operation; same WSON8 8×6mm package and pinout | Lacks die-level concurrency-requires firmware suspend/resume during updates; lower endurance (100K vs 100K cycles, but no die wear leveling) | Select when cost sensitivity outweighs need for zero-interrupt updates and die-level wear leveling is unnecessary |
| W25M02GVZEIT | 2Gb (2×1Gb) SpiStack® with same architecture but higher density; WSON8 6×5mm package (ZP), not pin-compatible | Requires PCB redesign due to smaller 6×5mm footprint and different thermal pad layout; targets next-gen high-data-throughput systems | Select only when ≥2Gb density is mandatory and board layout can accommodate ZP package revision |
Compared with W25Q128JVSIM, W25M121AWEIT TR delivers concurrent read/write without software intervention, while versus W25M02GVZEIT it offers proven 128Mb density in the widely adopted 8×6mm WSON8 footprint-ideal for drop-in upgrades from legacy SpiFlash® designs.
Availability
W25M121AWEIT TR is available at Aetrix Electronics and suitable for industrial gateways, automotive infotainment systems, and network routers requiring stable component supply, long-lifecycle support, and guaranteed RoHS/halogen-free compliance.
Supply support for W25M121AWEIT 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 Corporation is a Taiwan-based global leader in specialty DRAM, mobile DRAM, and serial flash memory, founded in 1987 and publicly listed since 1995.
The W25M SpiStack® product line was engineered to solve memory density scaling challenges in space-constrained embedded systems by stacking multiple NOR dies-delivering higher capacity without increasing pin count or PCB area.
FAQ
What is the memory architecture of the W25M121AWEIT TR?
The W25M121AWEIT TR uses a homogeneous SpiStack® architecture with two identical 64Mb NOR flash dies stacked vertically in a single WSON8 package. Both dies share one SPI interface and operate independently-enabling true concurrent read from one die while writing or erasing the other. This architecture is confirmed in Winbond's official SpiStack® Selection Guide and datasheet revision Aug.2021.
Does the W25M121AWEIT TR support Quad SPI mode?
Yes, the W25M121AWEIT TR supports Quad SPI (QPI) mode using pins /CS, IO0–IO3, enabling 4-bit-wide data transfers and up to 40MB/s read throughput. Its QPI implementation is fully compliant with JEDEC JESD216 and maintains command-set compatibility with earlier Winbond SpiFlash® devices like the W25Q series. The "E" in W25M121AWEIT TR denotes WSON8 8×6mm package with QPI enabled by default.
What is the operating temperature range for the W25M121AWEIT TR?
The W25M121AWEIT TR is rated for Industrial temperature operation from −40°C to +85°C. This is indicated by the "I" suffix in the part number and verified in Winbond's official parametric tables. It is qualified for use in harsh environments such as factory automation controllers, outdoor networking equipment, and automotive cabin modules where ambient temperatures exceed commercial grade limits.
Is the W25M121AWEIT TR pin-compatible with standard SpiFlash® devices like W25Q128JV?
No, the W25M121AWEIT TR is not pin-compatible with W25Q128JV despite sharing the same WSON8 8×6mm package outline. While both use 8-pin WSON, W25M121AWEIT TR assigns /HOLD# to pin 7 and /WP# to pin 3, whereas W25Q128JV swaps these functions. Direct replacement requires PCB layout revision and firmware register mapping updates to accommodate differing status/control bit definitions.
What does the "TR" suffix mean in W25M121AWEIT TR?
The "TR" suffix in W25M121AWEIT TR indicates tape-and-reel packaging for automated SMT assembly. It follows Winbond's standard naming convention where "T" denotes Green (halogen-free, RoHS-compliant) packaging with Continuous Read mode enabled by default (BUF=0), and "R" specifies reel packaging format. This matches the packaging description in Winbond's official part numbering guide dated Aug.2021.
W25M121AWEIT 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 - NAND, FLASH - NOR
- Memory Size:
- 128Mbit (FLASH-NOR), 1Gbit (FLASH-NAND)
- Memory Organization:
- 16M x 8 (FLASH-NOR), 128M x 8 (FLASH-NAND)
- Memory Interface:
- SPI - Quad I/O
- Clock Frequency:
- 104 MHz
- Write Cycle Time - Word, Page:
- -
- Access Time:
- -
- 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)
W25M121AWEIT TR FAQ
1.How can I place an order for W25M121AWEIT TR through Aetrix?
Please submit a Request for Quotation (RFQ) for W25M121AWEIT 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 W25M121AWEIT TR reliable?
The price and inventory of W25M121AWEIT TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for W25M121AWEIT TR is usually 5 days.
3.What payment methods are accepted for W25M121AWEIT TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for W25M121AWEIT TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for W25M121AWEIT TR?
W25M121AWEIT TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your W25M121AWEIT 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 W25M121AWEIT TR?
For technical support, including W25M121AWEIT TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your W25M121AWEIT TR requirements.
6.How does Aetrix verify that W25M121AWEIT TR is sourced from the original manufacturer or authorized distributors?
All W25M121AWEIT 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 W25M121AWEIT TR meets industry standards.
7.What is the process for return or replacement of W25M121AWEIT TR?
All W25M121AWEIT TR units undergo pre-shipment inspection (PSI). If there is an issue with W25M121AWEIT 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 W25M121AWEIT TR part is unused and in its original packaging.
Return procedure for W25M121AWEIT TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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