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Renesas AT25DF021A-DWFAT
- Part No.:
- AT25DF021A-DWFAT
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- Die
- Datasheet:
-
AT25DF021A-DWFAT.pdf
- Description:
- 2 MBIT, WIDE VCC (1.7V TO 3.6V),
- Quantity:
- Payment:
- Shipping:
Inventory:1,470
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Product details
Overview
AT25DF021A-DWFAT from Renesas Electronics is a 2-Mbit serial SPI Flash memory IC supporting Dual-I/O operation, 104 MHz max clock frequency, 6 ns clock-to-output delay, and flexible erase architecture (256-byte page, 4/32/64-kByte blocks). It operates from 1.65 V to 3.6 V across –40°C to +85°C and is used for code shadowing and embedded data storage in resource-constrained microcontroller systems.
For engineers reviewing the AT25DF021A-DWFAT datasheet, AT25DF021A-DWFAT pinout, AT25DF021A-DWFAT application, or AT25DF021A-DWFAT equivalent, key selection criteria include SPI Mode 0/3 compatibility, hardware write-protect via WP pin, OTP security register programmability, ultra-low deep power-down current (200 nA), and industrial temperature support with green packaging options.
Technical Context
The AT25DF021A-DWFAT implements a standard SPI interface with dual-output read capability using SI (I/O0) and SO (I/O1) pins, enabling 2-bit-per-clock data transfer. Its memory array is organized into uniform 4-kByte, 32-kByte, and 64-kByte erase blocks plus 256-byte pages, optimized for mixed code-and-data storage without external buffering.
It integrates hardware-controlled sector protection via the WP pin and software-configurable status register bits, supports JEDEC-standard manufacturer/device ID reads, and features two low-power states-Deep Power-Down (4.5 µA) and Ultra-Deep Power-Down (200 nA)-with dedicated entry/exit commands and automatic erase/program failure reporting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256 KByte) serial Flash, sufficient for boot code and firmware storage in compact MCU designs. |
| Interface | SPI-compatible with Modes 0 and 3; supports Dual-I/O read for doubled throughput at same clock rate. |
| Max Clock Frequency | 104 MHz - enables fast sequential reads up to ~26 MB/s in Dual-I/O mode. |
| Access Time | 6 ns clock-to-output (tV) - ensures minimal latency for time-critical instruction fetches. |
| Erase Granularity | 256-byte page, 4/32/64-kByte uniform blocks, and full chip erase - allows precise updates without disturbing adjacent code/data. |
| Power Consumption | 200 nA Ultra Deep Power-Down current - extends battery life in always-on IoT edge nodes. |
| Data Retention | 20 years - guarantees long-term reliability for firmware images and calibration data in field-deployed equipment. |
Pinout & Package
AT25DF021A-DWFAT is packaged in an 8-lead SOIC (150-mil) per JEDEC MS-012, with gull-wing leads and standard 1.27 mm pitch. This package supports reflow soldering and is compatible with automated PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must transition high→low to initiate command, low→high to terminate operation. |
| SCK | Serial Clock | Master-generated clock; rising edge latches input (SI), falling edge clocks output (SO). |
| SI (I/O0) | Serial Input / Dual-I/O Data 0 | Command/address/data input; becomes I/O0 during Dual-I/O reads to output LSB of dual-bit data. |
| SO (I/O1) | Serial Output / Dual-I/O Data 1 | Data output pin; remains I/O1 during Dual-I/O reads to output MSB of dual-bit data. |
| WP | Write Protect | Hardware lock control; low state enables sector protection independent of software commands. |
| HOLD | Hold Request | Pauses ongoing SPI transfer without deselecting device; requires CS asserted and SCK low to activate. |
| VCC | Power Supply | Single 1.65–3.6 V supply; powers all internal logic and memory array - no auxiliary voltage needed. |
| GND | Ground Reference | System ground return path; required for stable operation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-I/O Read Support | Enables 2-bit-per-clock data transfer using SI and SO pins, doubling effective read bandwidth vs. standard SPI. |
| Flexible Erase Architecture | Supports 256-byte page, 4/32/64-kByte block, and full-chip erase - minimizes wasted space in mixed code/data layouts. |
| 128-Byte OTP Security Register | Factory-programmed 64-byte unique ID + 64-byte user-programmable space for secure device serialization or key storage. |
| Ultra-Low Power Modes | 200 nA Ultra Deep Power-Down current allows multi-year battery operation in maintenance-free sensor nodes. |
| Hardware Write Protection | WP pin provides tamper-resistant sector locking independent of software state - critical for bootloader integrity. |
Applications
| Industrial PLC Firmware Storage | Medical Wearable Boot Memory |
|---|---|
Use Scenario: Storing firmware and configuration data in programmable logic controllers deployed in factory automation environments with wide temperature swings. IC Role / Device Role / Timing Role: Non-volatile code storage with fast random access and reliable in-field updates via SPI interface. Use Value: 20-year data retention and –40°C to +85°C operation ensure firmware persistence over equipment lifetime without refresh cycles. | Use Scenario: Holding boot code and calibration parameters in compact, battery-powered ECG patches requiring ultra-low standby power. IC Role / Device Role / Timing Role: Primary boot memory accessed by ARM Cortex-M0+ during cold start; enters Ultra Deep Power-Down between measurements. Use Value: 200 nA deep sleep current extends single-CR2032 battery life beyond 36 months in intermittent-sampling mode. |
| Automotive Infotainment UI Assets | Smart Home Gateway Configuration |
Use Scenario: Caching GUI assets (icons, fonts, localized strings) in automotive head units where rapid UI rendering is required after ignition. IC Role / Device Role / Timing Role: High-speed SPI Flash providing low-latency read access to compressed UI resources via Dual-I/O mode. Use Value: 104 MHz clock and 6 ns tV enable sub-100 µs load times for critical UI elements, improving perceived system responsiveness. | Use Scenario: Storing network credentials, OTA update metadata, and device-specific settings in Wi-Fi/Zigbee gateways operating continuously on AC power. IC Role / Device Role / Timing Role: Secure, field-updatable non-volatile storage with hardware write protection for sensitive configuration data. Use Value: WP pin + OTP register allow immutable root-of-trust setup and prevent accidental overwrite of provisioning keys during firmware upgrades. |
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, 133 MHz max clock, Quad-I/O support (vs. Dual-I/O only), 1.7–1.95 V supply range. | Requires Quad-SPI controller; higher performance but narrower voltage window limits use in 3.3 V-only systems. | Select when Quad-I/O bandwidth is required and host supports QSPI; not drop-in due to command set and voltage differences. |
| Micron MT25QL02GA | 2 Mbit density, 133 MHz max clock, Quad-I/O, 1.7–2.0 V or 2.7–3.6 V dual supply options. | Supports both narrow and wide voltage ranges; lacks OTP register and has different sector protection scheme. | Choose for broader voltage flexibility and higher speed; verify OTP and protection feature parity before migration. |
Compared with W25Q20EW and MT25QL02GA, the AT25DF021A-DWFAT offers guaranteed Dual-I/O compatibility with legacy SPI controllers, integrated hardware write protection via WP pin, and a dedicated 128-byte OTP register - making it optimal for cost-sensitive, low-power, and security-aware embedded designs where Quad-I/O is unnecessary.
Availability
AT25DF021A-DWFAT is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical wearable boot memory, and automotive infotainment UI assets requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AT25DF021A-DWFAT 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 delivering trusted embedded solutions for automotive, industrial, infrastructure, and IoT applications.
The AT25DF021A-DWFAT belongs to Renesas' serial Flash memory product line, designed specifically for code shadowing and mixed-code/data storage in space- and power-constrained microcontroller-based systems.
FAQ
What is the operating voltage range of the AT25DF021A-DWFAT?
The AT25DF021A-DWFAT operates from 1.65 V to 3.6 V across the industrial temperature range (–40°C to +85°C). At extended temperature (–40°C to +125°C), the minimum supply rises to 1.7 V. No separate programming voltage is required - all operations, including erase and program, execute within this single supply range, simplifying power design in battery- and energy-harvesting applications.
Does the AT25DF021A-DWFAT support Quad-I/O or only Dual-I/O?
The AT25DF021A-DWFAT supports SPI Modes 0 and 3 and Dual-I/O read operations using SI (I/O0) and SO (I/O1) pins. It does not support Quad-I/O (four data lines); its interface is strictly dual-line for enhanced throughput over standard SPI. This makes the AT25DF021A-DWFAT compatible with legacy SPI controllers lacking Quad-I/O capability while still delivering improved read performance.
How is hardware write protection implemented on the AT25DF021A-DWFAT?
Hardware write protection on the AT25DF021A-DWFAT is controlled via the WP (Write Protect) pin, which is active-low and internally pulled-high. When WP is driven low, it enables hardware locking of protected sectors regardless of software status register settings. This provides tamper-resistant protection for critical firmware regions like bootloaders, complementing software-based sector protection commands.
What is the purpose and structure of the OTP security register in the AT25DF021A-DWFAT?
The AT25DF021A-DWFAT includes a 128-byte One-Time Programmable (OTP) security register: 64 bytes are factory-programmed with a unique device identifier, and 64 bytes are user-programmable for secure data such as cryptographic keys or calibration constants. Once written, OTP locations cannot be erased or rewritten - ensuring permanent, authenticated device identity and secure key storage for system-level security functions.
What are the power consumption characteristics of the AT25DF021A-DWFAT in low-power modes?
The AT25DF021A-DWFAT offers two ultra-low-power states: Deep Power-Down draws 4.5 µA typical, and Ultra-Deep Power-Down draws just 200 nA typical. Both modes retain full memory contents and are exited via specific command sequences (RESUME or chip-select toggle). These modes are essential for extending battery life in always-on IoT sensors and wearables where the Flash remains idle >99% of the time.
AT25DF021A-DWFAT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- Die
- Packaging:
- Bulk
- 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:
- 85 MHz
- Write Cycle Time - Word, Page:
- 12µs, 5ms
- Access Time:
- 6 ns
- Voltage - Supply:
- 1.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Wafer
AT25DF021A-DWFAT FAQ
1.How can I place an order for AT25DF021A-DWFAT through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25DF021A-DWFAT 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 AT25DF021A-DWFAT reliable?
The price and inventory of AT25DF021A-DWFAT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25DF021A-DWFAT is usually 5 days.
3.What payment methods are accepted for AT25DF021A-DWFAT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25DF021A-DWFAT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25DF021A-DWFAT?
AT25DF021A-DWFAT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25DF021A-DWFAT 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 AT25DF021A-DWFAT?
For technical support, including AT25DF021A-DWFAT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25DF021A-DWFAT requirements.
6.How does Aetrix verify that AT25DF021A-DWFAT is sourced from the original manufacturer or authorized distributors?
All AT25DF021A-DWFAT 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 AT25DF021A-DWFAT meets industry standards.
7.What is the process for return or replacement of AT25DF021A-DWFAT?
All AT25DF021A-DWFAT units undergo pre-shipment inspection (PSI). If there is an issue with AT25DF021A-DWFAT, 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 AT25DF021A-DWFAT part is unused and in its original packaging.
Return procedure for AT25DF021A-DWFAT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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