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Renesas AT25DF021A-DWFHT
- Part No.:
- AT25DF021A-DWFHT
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- Die
- Datasheet:
-
AT25DF021A-DWFHT.pdf
- Description:
- 2 MBIT, WIDE VCC (1.7V TO 3.6V),
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT25DF021A-DWFHT from Renesas Electronics is a 2-Mbit serial SPI Flash memory IC designed for code shadowing and embedded data storage in resource-constrained systems. It operates from 1.65 V to 3.6 V across –40°C to +85°C, supports Dual-I/O read mode at up to 104 MHz, delivers 6 ns clock-to-output timing, and features uniform 4-kByte/32-kByte/64-kByte block erase plus 256-Byte page erase.
For engineers reviewing the AT25DF021A-DWFHT datasheet, AT25DF021A-DWFHT pinout, AT25DF021A-DWFHT application, or AT25DF021A-DWFHT equivalent, key selection criteria include SPI Mode 0/3 compatibility, ultra-low deep power-down current (200 nA), OTP security register programmability, industrial temperature support, and flexible sector protection via WP pin and software commands.
Technical Context
The AT25DF021A-DWFHT implements a standard SPI interface with hardware-controlled write protection via the WP pin and suspend/resume capability via the HOLD pin. Its dual-I/O read architecture enables two-bit-per-clock output using SI (I/O0) and SO (I/O1), doubling effective throughput versus single-I/O mode without requiring additional pins.
Internally, it integrates a flash memory array with hierarchical erase granularity-256-Byte pages, 4-kByte blocks, 32-kByte blocks, 64-kByte blocks, and full-chip erase-optimized for mixed code+data storage. The device includes a 128-Byte OTP security register (64 bytes factory-unique, 64 bytes user-programmable) and status register polling for program/erase completion detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 bytes), sufficient for boot code, firmware images, and configuration data in compact embedded systems. |
| Supply Voltage Range | 1.65 V to 3.6 V - enables direct interfacing with 1.8 V and 3.3 V microcontrollers without level-shifting. |
| Max Clock Frequency | 104 MHz - supports high-speed read operations in Dual-I/O mode, reducing instruction fetch latency. |
| Read Latency | 6 ns clock-to-output (tV) - ensures minimal delay between clock edge and valid data on SO/I/O1, critical for real-time code execution. |
| Erase Granularity | 256-Byte page, 4/32/64-kByte uniform blocks - allows precise updates of firmware segments or logging data without disturbing adjacent code. |
| Power Consumption | 200 nA ultra-deep power-down current - extends battery life in always-on IoT endpoints and wearables during sleep states. |
| Endurance & Retention | 100,000 program/erase cycles and 20-year data retention at –40°C to +85°C - meets long-life requirements for industrial and automotive ECUs. |
Pinout & Package
AT25DF021A-DWFHT is packaged in an 8-pad Ultra Thin DFN (2 × 3 × 0.6 mm) per ordering code DWFHT, with exposed pad for thermal dissipation and space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must transition low-to-high to complete any command sequence, including self-timed erase/program operations. |
| SCK | Serial Clock | Input clock controlling data latching (SI on rising edge) and output timing (SO on falling edge); supports SPI Modes 0 and 3. |
| SI (I/O0) | Serial Input / Dual-I/O Data 0 | Primary command/address/data input; becomes bidirectional I/O0 during Dual-I/O read to output LSB of dual-bit data stream. |
| SO (I/O1) | Serial Output / Dual-I/O Data 1 | Primary data output; remains I/O1 during Dual-I/O read to output MSB of dual-bit data stream on each SCK falling edge. |
| WP | Write Protect | Hardware lock control: asserted low to freeze sector protection bits; internally pulled high, allowing floating if unused. |
| HOLD | Communication Suspend | Pauses ongoing SPI transfers without deselecting device or resetting internal state; requires CS active and SCK low to initiate. |
| VCC | Power Supply | Single 1.65–3.6 V supply powers all functions - no auxiliary voltage required for programming or erasing. |
| GND | Ground Reference | System ground return path; must be low-impedance to ensure stable read/write margins and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-I/O Read Mode | Enables 2-bit-per-clock data transfer using SI and SO simultaneously, doubling effective read bandwidth over standard SPI without added pins or controller complexity. |
| Flexible Erase Architecture | Supports 256-Byte page erase for fine-grained data updates and multiple uniform block sizes (4/32/64 kByte) to align with firmware partitioning schemes. |
| OTP Security Register | 128-Byte field with 64-byte factory-unique ID and 64-byte user-programmable space - enables secure device serialization and cryptographic key binding. |
| Hardware + Software Protection | Combines WP pin-based sector locking with software-configurable protection registers, allowing layered security for boot code and sensitive parameters. |
| Ultra-Low Power States | 200 nA ultra-deep power-down and 4.5 µA deep power-down modes minimize quiescent current in battery-powered applications with infrequent wake-ups. |
Applications
| Industrial PLC Firmware Storage | Medical Sensor Data Logging |
|---|---|
Use Scenario: Storing firmware images and calibration tables in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Non-volatile code storage with fast read access for boot-time shadowing into RAM and in-field firmware updates via page/block erase. Use Value: Uniform 4-kByte block erase enables atomic update of individual function modules without disrupting operational code, reducing downtime during maintenance. | Use Scenario: Capturing time-stamped physiological measurements from portable ECG or glucose monitors between wireless uploads. IC Role / Device Role / Timing Role: Low-power data buffer with guaranteed 20-year retention, supporting intermittent write bursts and long idle periods. Use Value: 200 nA ultra-deep power-down current extends single-cell coin-cell battery life beyond 5 years in Class II medical devices. |
| Automotive Body Control Module | Smart Home Hub Configuration |
Use Scenario: Holding vehicle-specific configuration data (e.g., door lock behavior, mirror presets) in body control units operating across –40°C to +125°C. IC Role / Device Role / Timing Role: Industrial-temperature-rated Flash memory providing reliable parameter storage under engine-bay thermal stress. Use Value: Rated endurance of 20,000 P/E cycles at +125°C ensures robustness for lifetime reconfiguration events in automotive ECUs. | Use Scenario: Storing Wi-Fi credentials, user preferences, and OTA update staging in voice-controlled home hubs with strict size constraints. IC Role / Device Role / Timing Role: Compact 2 × 3 mm DFN-packaged memory enabling high-density PCB layouts while supporting secure credential storage via OTP register. Use Value: Factory-programmed 64-byte unique ID enables cloud-based device identity binding and prevents credential cloning across units. |
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, 1.7–2.0 V supply range only; lacks ultra-deep power-down (250 nA typical deep power-down vs. AT25DF021A-DWFHT's 200 nA); no factory-unique OTP ID. | Best suited for 1.8 V-only systems where lowest quiescent current is secondary; not recommended for battery-critical or secure serialization use cases. | Select W25Q20EW only when system voltage is strictly 1.8 V and OTP security is unnecessary. |
| Micron MT25QL02GA | 2 Mbit density, wider 1.7–3.6 V range, supports Quad-I/O (QPI) and XIP; higher 133 MHz max frequency but 8 ns tV latency; 1 µA deep power-down (vs. 4.5 µA). | Preferred for systems requiring execute-in-place (XIP) or future-proofing with Quad-I/O expansion; less optimal for ultra-low-power sleep states due to higher deep power-down current. | Choose MT25QL02GA when Quad-I/O bandwidth or XIP capability is required; avoid if sub-µA deep-sleep current is mandatory. |
Compared with W25Q20EW and MT25QL02GA, the AT25DF021A-DWFHT uniquely balances ultra-low 200 nA power-down current, factory-unique OTP ID, and broad 1.65–3.6 V operation - making it optimal for battery-powered, security-aware, and mixed-voltage embedded designs where minimal footprint and guaranteed data retention are critical.
Availability
AT25DF021A-DWFHT is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical sensor data logging, and automotive body control module applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AT25DF021A-DWFHT 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 microcontrollers, analog, power, and memory solutions for automotive, industrial, infrastructure, and IoT markets.
The AT25DF021A-DWFHT belongs to Renesas' serial Flash memory product line, engineered specifically for cost-sensitive, space-constrained embedded systems needing reliable code storage, secure data handling, and ultra-low power consumption across extended temperature ranges.
FAQ
What is the maximum operating frequency supported by the AT25DF021A-DWFHT in Dual-I/O mode?
The AT25DF021A-DWFHT supports a maximum clock frequency of 104 MHz in Dual-I/O read mode. This specification is validated across the full industrial temperature range (–40°C to +85°C) and enables high-throughput data retrieval for boot code shadowing and firmware streaming. The device maintains timing compliance with 6 ns clock-to-output delay (tV), ensuring deterministic read performance in time-critical applications.
Does the AT25DF021A-DWFHT include hardware write protection independent of software commands?
Yes, the AT25DF021A-DWFHT provides hardware write protection via the dedicated WP (Write Protect) pin, which asserts low to lock sector protection registers. This feature operates independently of SPI commands and remains active even during power transitions. The WP pin is internally pulled high, allowing it to be left unconnected if hardware protection is not required - though external connection to VCC is recommended for noise immunity.
How does the OTP security register in the AT25DF021A-DWFHT support device authentication?
The AT25DF021A-DWFHT includes a 128-Byte One-Time Programmable (OTP) security register, with 64 bytes factory-programmed with a unique identifier and 64 bytes user-programmable. This structure enables cryptographically secure device authentication by binding firmware signatures or encryption keys to the immutable factory ID, preventing cloning or unauthorized firmware replacement in certified medical or industrial deployments.
What erase block sizes are available on the AT25DF021A-DWFHT, and how do they benefit firmware updates?
The AT25DF021A-DWFHT supports four erase granularities: 256-Byte page, 4-kByte block, 32-kByte block, and 64-kByte block, plus full-chip erase. This hierarchy allows firmware updates to target only modified functional modules (e.g., 4-kByte bootloader section) without erasing unrelated application code - minimizing update time, reducing wear on unaffected sectors, and improving field reliability compared to monolithic erase architectures.
Is the AT25DF021A-DWFHT compatible with standard SPI controllers without requiring custom drivers?
Yes, the AT25DF021A-DWFHT is fully compatible with standard SPI controllers supporting Modes 0 and 3. It uses conventional SPI signals (CS, SCK, SI, SO) and implements JEDEC-standard manufacturer and device ID read commands. All basic read, program, and erase operations follow industry-standard opcodes (e.g., 03h for Read Array, 02h for Page Program), eliminating the need for proprietary driver development in Linux, RTOS, or bare-metal environments.
AT25DF021A-DWFHT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- Die
- Packaging:
- Tray
- 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-DWFHT FAQ
1.How can I place an order for AT25DF021A-DWFHT through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25DF021A-DWFHT 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-DWFHT reliable?
The price and inventory of AT25DF021A-DWFHT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25DF021A-DWFHT is usually 5 days.
3.What payment methods are accepted for AT25DF021A-DWFHT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25DF021A-DWFHT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25DF021A-DWFHT?
AT25DF021A-DWFHT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25DF021A-DWFHT 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-DWFHT?
For technical support, including AT25DF021A-DWFHT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25DF021A-DWFHT requirements.
6.How does Aetrix verify that AT25DF021A-DWFHT is sourced from the original manufacturer or authorized distributors?
All AT25DF021A-DWFHT 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-DWFHT meets industry standards.
7.What is the process for return or replacement of AT25DF021A-DWFHT?
All AT25DF021A-DWFHT units undergo pre-shipment inspection (PSI). If there is an issue with AT25DF021A-DWFHT, 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-DWFHT part is unused and in its original packaging.
Return procedure for AT25DF021A-DWFHT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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