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Renesas AT25XE021A-UUN-T
- Part No.:
- AT25XE021A-UUN-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-UFBGA, WLCSP
- Datasheet:
-
AT25XE021A-UUN-T.pdf
- Description:
- IC FLASH 2MBIT SPI/DUAL 8WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:2,828
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Product details
Overview
AT25XE021A-UUN-T from Renesas Electronics is a 2-Mbit SPI serial Flash memory IC supporting Dual-I/O operation, 70 MHz max clock frequency, 6 ns clock-to-output delay, 1.65–3.6 V single supply, and industrial temperature range. It serves as nonvolatile code/data storage in microcontroller boot systems and firmware update modules.
For engineers reviewing the AT25XE021A-UUN-T datasheet, AT25XE021A-UUN-T pinout, AT25XE021A-UUN-T application, or AT25XE021A-UUN-T equivalent, key selection criteria include Dual-I/O read bandwidth, ultra-deep power-down current (200 nA), flexible erase granularity (256-byte page to 64-kByte block), OTP security register, and SOIC-8 package compatibility.
Technical Context
The AT25XE021A-UUN-T implements standard SPI interface with support for Modes 0 and 3, enabling interoperability with most host MCUs. Its Dual-I/O Read mode doubles data throughput by outputting two bits per SCK falling edge using SI (I/O0) and SO (I/O1) pins simultaneously.
Internally, it features a segmented memory architecture with uniform 4-kByte, 32-kByte, and 64-kByte erase blocks plus 256-byte page erase - optimized for mixed code-and-data storage without wasted sectors. Hardware write protection is enforced via the WP pin, while sector locking can be managed through status register bits and software commands.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 bytes) - sufficient for MCU boot code, configuration tables, and firmware patches in space-constrained designs. |
| Interface | SPI-compatible with Dual-I/O Read - enables 140 MB/s theoretical peak read bandwidth at 70 MHz, reducing firmware load latency. |
| Supply Voltage | 1.65 V to 3.6 V - supports direct interfacing with 1.8 V and 3.3 V logic domains without level shifters. |
| Erase Granularity | 256-byte page / 4-kByte / 32-kByte / 64-kByte blocks - allows precise updates of small data segments without disturbing adjacent code regions. |
| Power-Down Current | 200 nA ultra-deep power-down (typical) - extends battery life in always-on IoT sensor nodes and wearable devices. |
| Endurance & Retention | 100,000 program/erase cycles; 20-year data retention - meets long-life requirements for industrial controllers and automotive ECUs. |
| Timing Performance | 6 ns clock-to-output (tV); 2 ms typical page program time - ensures fast execution of boot sequences and over-the-air firmware writes. |
Pinout & Package
AT25XE021A-UUN-T is packaged in an 8-lead SOIC (150-mil) with standard pinout compatible with JEDEC MS-012. All pins are electrically validated per datasheet Rev.L.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must transition high-to-low to initiate command sequence and low-to-high to terminate - critical for multi-device SPI bus arbitration. |
| SCK | Serial Clock | Master-generated clock; rising edge latches input (SI), falling edge clocks output (SO/I/O1) - defines timing window for reliable communication up to 70 MHz. |
| SI (I/O0) | Serial Input / Dual-I/O Data 0 | Command/address/data input pin; becomes bidirectional I/O0 during Dual-I/O Read - enables parallel bit streaming without additional pins. |
| SO (I/O1) | Serial Output / Dual-I/O Data 1 | Data output pin; remains active I/O1 in Dual-I/O mode - pairs with SI to deliver 2-bit-per-cycle throughput. |
| WP | Write Protect | Hardware lock control; low assertion disables write/erase commands - provides tamper-resistant firmware protection independent of software state. |
| HOLD | Communication Hold | Pauses ongoing SPI transfer without deselecting device; requires CS asserted and SCK low - preserves internal state during MCU interrupt servicing. |
| VCC | Power Supply | Single 1.65–3.6 V rail powers core logic and memory array - eliminates need for charge pumps or auxiliary supplies. |
| GND | Ground Reference | Common return path for all signals and power - must be low-impedance to maintain signal integrity and minimize read/write errors. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-I/O Read Mode | Delivers 2× read bandwidth vs. standard SPI by using SI and SO as simultaneous data outputs - accelerates boot image loading and OTA firmware verification. |
| Flexible Erase Architecture | Supports 256-byte page erase alongside uniform 4/32/64-kByte blocks - minimizes flash wear and avoids full-chip erases during partial firmware updates. |
| 128-byte OTP Security Register | Factory-programmed 64-byte unique ID + 64-byte user-programmable space - enables secure device authentication and cryptographic key binding in embedded systems. |
| Ultra-Deep Power-Down | 200 nA standby current with instant wake-up - ideal for battery-powered edge nodes requiring years of operation on coin-cell batteries. |
| Hardware Write Protection | WP pin physically disables write/erase operations regardless of software state - prevents accidental corruption during power transients or firmware faults. |
Applications
| Industrial PLC Firmware Storage | Automotive Telematics Boot Memory |
|---|---|
Use Scenario: Storing boot loader and real-time control firmware in programmable logic controllers operating across -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Nonvolatile code storage with fast random-access read capability and robust erase endurance for field firmware upgrades. Use Value: 20-year data retention and 100,000-cycle endurance ensure reliability over extended service intervals without replacement. | Use Scenario: Hosting secure boot images and vehicle configuration data in LTE-connected telematics control units (TCUs). IC Role / Device Role / Timing Role: SPI-connected Flash memory providing authenticated firmware launch and encrypted parameter storage via OTP register. Use Value: Dual-I/O Read reduces boot time by ~50% versus standard SPI, accelerating vehicle startup and diagnostics readiness. |
| IoT Edge Sensor Node Code Storage | Medical Wearable Device Configuration |
Use Scenario: Holding compact RTOS kernel and sensor fusion algorithms in ultra-low-power environmental monitoring nodes. IC Role / Device Role / Timing Role: Low-voltage (1.65 V) Flash memory enabling direct integration with energy-harvesting power management ICs. Use Value: 200 nA ultra-deep power-down current extends operational lifetime beyond 5 years on primary lithium batteries. | Use Scenario: Storing calibrated sensor offsets, patient-specific therapy parameters, and regulatory compliance flags in FDA-cleared wearable monitors. IC Role / Device Role / Timing Role: Secure, tamper-evident nonvolatile memory with hardware write protection and unique serialization. Use Value: Factory-programmed 64-byte UID enables traceability and anti-counterfeiting; WP pin prevents unauthorized reconfiguration during clinical use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Winbond W25Q20EW | 2-Mbit density, same SOIC-8 package, but only supports standard SPI (no Dual-I/O); 104 MHz max clock; 256-byte page erase only. | Lacks Dual-I/O bandwidth boost and 4/32/64-kByte uniform block erase - less suitable for mixed code/data partitioning. | Select when maximum read speed is secondary to cost and legacy SPI compatibility is required. |
| Micron MT25QL02GA | 2-Mbit Quad SPI (QSPI) Flash with 133 MHz clock; supports x4 I/O; includes SFDP register; higher pin count (8-pin USON). | Requires QSPI controller support and different PCB layout; offers faster sequential reads but no OTP register or hardware WP pin. | Choose for systems already implementing QSPI interfaces and needing higher throughput, accepting trade-offs in security and pin compatibility. |
Compared with W25Q20EW and MT25QL02GA, the AT25XE021A-UUN-T uniquely balances Dual-I/O performance, flexible erase granularity, integrated hardware write protection, and factory-programmed UID - making it optimal for resource-constrained, security-aware embedded designs where SOIC-8 footprint and 1.65 V operation are mandatory.
Availability
AT25XE021A-UUN-T is available at Aetrix Electronics and suitable for industrial automation, automotive telematics, and medical wearable applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AT25XE021A-UUN-T 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
Renesas Electronics is a global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and IoT markets.
The AT25XE021A belongs to Renesas' serial Flash memory product line, engineered for high-reliability embedded code and data storage with emphasis on low-voltage operation, security features, and flexible erase architecture.
FAQ
What is the operating voltage range of the AT25XE021A-UUN-T?
The AT25XE021A-UUN-T operates from 1.65 V to 3.6 V, enabling direct connection to 1.8 V and 3.3 V system rails without level-shifting circuitry. This wide supply range supports mixed-voltage designs and simplifies power architecture in battery-powered and industrial applications. The AT25XE021A-UUN-T maintains full functionality-including Dual-I/O Read, program, and erase-across this entire voltage window.
Does the AT25XE021A-UUN-T support Dual-I/O Read mode, and how does it affect performance?
Yes, the AT25XE021A-UUN-T supports Dual-I/O Read using SI (I/O0) and SO (I/O1) pins to output two bits per SCK falling edge. This doubles effective read bandwidth versus standard SPI, achieving up to 140 MB/s at 70 MHz. The AT25XE021A-UUN-T implements this mode with dedicated command opcodes (e.g., 3Bh) and requires no external components - directly improving boot time and firmware update verification speed.
How is hardware write protection implemented on the AT25XE021A-UUN-T?
Hardware write protection on the AT25XE021A-UUN-T is controlled by the WP (Write Protect) pin, which is active-low. When pulled low, the WP pin disables all write, program, and erase commands regardless of status register settings - providing fail-safe protection against accidental or malicious corruption. The AT25XE021A-UUN-T includes internal pull-up on WP, allowing floating use if not needed, though external tie-to-VCC is recommended for noise immunity.
What security features does the AT25XE021A-UUN-T provide?
The AT25XE021A-UUN-T integrates a 128-byte One-Time Programmable (OTP) Security Register: 64 bytes are factory-programmed with a unique identifier, and 64 bytes are user-programmable for keys or certificates. This enables device serialization, secure boot validation, and ESN storage. The AT25XE021A-UUN-T supports dedicated Program/Read OTP commands (AH/ABh) and protects OTP contents from overwrite after programming - a hardware-enforced security boundary.
What erase block sizes are supported by the AT25XE021A-UUN-T?
The AT25XE021A-UUN-T supports four erase granularities: 256-byte pages, uniform 4-kByte blocks, uniform 32-kByte blocks, and uniform 64-kByte blocks - plus full chip erase. This architecture allows precise firmware patching and data logging without erasing unrelated code sections. The AT25XE021A-UUN-T's memory map allocates contiguous address ranges to each block size, enabling deterministic erase scheduling and minimizing flash wear in long-life applications.
AT25XE021A-UUN-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH - NOR (SLC)
- Memory Size:
- 2Mbit
- Memory Organization:
- 256K x 8
- Memory Interface:
- SPI - Dual I/O
- Clock Frequency:
- 70 MHz
- Write Cycle Time - Word, Page:
- 12µs, 3ms
- Access Time:
- 6 ns
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WLCSP (1.9x1.4)
AT25XE021A-UUN-T FAQ
1.How can I place an order for AT25XE021A-UUN-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25XE021A-UUN-T 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 AT25XE021A-UUN-T reliable?
The price and inventory of AT25XE021A-UUN-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25XE021A-UUN-T is usually 5 days.
3.What payment methods are accepted for AT25XE021A-UUN-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25XE021A-UUN-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25XE021A-UUN-T?
AT25XE021A-UUN-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25XE021A-UUN-T 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 AT25XE021A-UUN-T?
For technical support, including AT25XE021A-UUN-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25XE021A-UUN-T requirements.
6.How does Aetrix verify that AT25XE021A-UUN-T is sourced from the original manufacturer or authorized distributors?
All AT25XE021A-UUN-T 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 AT25XE021A-UUN-T meets industry standards.
7.What is the process for return or replacement of AT25XE021A-UUN-T?
All AT25XE021A-UUN-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25XE021A-UUN-T, 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 AT25XE021A-UUN-T part is unused and in its original packaging.
Return procedure for AT25XE021A-UUN-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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