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Renesas AT25DF021A-DWF
- Part No.:
- AT25DF021A-DWF
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- Die
- Datasheet:
-
AT25DF021A-DWF.pdf
- Description:
- 2 MBIT, WIDE VCC (1.65V TO 3.6V)
- Quantity:
- Payment:
- Shipping:
Inventory:2,785
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Product details
Overview
AT25DF021A-DWF from Renesas Electronics is a 2-Mbit serial Flash memory IC supporting SPI Modes 0/3 and Dual-I/O read operations, with 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 1.65–3.6 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-DWF datasheet, AT25DF021A-DWF pinout, AT25DF021A-DWF application, or AT25DF021A-DWF equivalent, key selection criteria include dual-I/O throughput, ultra-low deep power-down current (200 nA), OTP security register support, industrial temperature compliance, and SOIC-8 package compatibility with legacy PCB layouts.
Technical Context
The AT25DF021A-DWF implements a serial peripheral interface with hardware-controlled write protection via WP pin and suspend/resume capability via HOLD pin. Its memory array supports byte/page program, dual-input programming, and four uniform block erase granularities - enabling efficient co-location of firmware code and runtime data without cross-contamination during updates.
Internally, it integrates SRAM data buffering, Y/X decoding logic, and status register polling with active interrupt support. The device uses JEDEC-standard manufacturer/device ID read methodology and includes dedicated OTP security register (128 bytes, 64 factory-programmed, 64 user-programmable) for ESN or key storage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 bytes) - sufficient for boot code, configuration tables, and firmware patches in MCU-based edge devices. |
| Max Clock Frequency | 104 MHz - enables high-speed instruction fetch and data streaming in real-time applications. |
| Read Latency | 6 ns clock-to-output (tV) - minimizes wait states during SPI read cycles, improving effective throughput. |
| Erase Granularity | 256-byte page / 4-kByte / 32-kByte / 64-kByte uniform blocks - allows precise firmware module updates without erasing unrelated data sectors. |
| Power Consumption | 200 nA ultra-deep power-down current - extends battery life in always-on IoT sensors and wearables. |
| Endurance & Retention | 100,000 program/erase cycles and 20-year data retention at –40°C to +85°C - suitable for field-upgradable industrial controllers. |
| Supply Voltage | 1.65 V to 3.6 V - compatible with single-supply 1.8 V or 3.3 V microcontroller interfaces without level-shifting. |
Pinout & Package
AT25DF021A-DWF is packaged in an industry-standard 8-lead SOIC (150-mil) with gull-wing leads, compatible with automated SMT assembly and legacy board footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must transition high→low to initiate command and low→high to terminate operation. |
| SCK | Serial Clock | Master-generated clock; rising edge latches SI input, falling edge clocks SO output per SPI timing rules. |
| SI (I/O0) | Serial Input / Dual-I/O Data Line 0 | Command/address/data input; becomes bidirectional I/O0 during Dual-Output Read for concurrent 2-bit data transfer. |
| SO (I/O1) | Serial Output / Dual-I/O Data Line 1 | Data output during standard reads; remains I/O1 in Dual-Output mode to deliver second bit per SCK falling edge. |
| WP | Write Protect | Hardware lock control; low assertion prevents status register writes and sector protection changes - critical for secure firmware updates. |
| HOLD | Communication Suspend | Pauses ongoing SPI transfers without deselecting device or resetting internal state - preserves context during MCU interrupts. |
| VCC | Power Supply | Single 1.65–3.6 V supply powers all logic and memory functions; no auxiliary voltage required for programming/erasing. |
| GND | Ground Reference | Common return path for VCC and all I/O signals; must be low-impedance connection to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-I/O Read Support | Enables 2-bit-per-clock data transfer, doubling effective read bandwidth versus standard SPI - accelerates boot time and OTA update verification. |
| Flexible Erase Architecture | Four erase granularities (page/block/chip) allow independent firmware and parameter updates without full-memory reprogramming - reduces field service downtime. |
| 128-Byte OTP Security Register | Factory-programmed 64-byte unique ID plus 64-byte user space enables secure device serialization, cryptographic key binding, and anti-cloning measures. |
| Ultra-Deep Power-Down Mode | 200 nA typical quiescent current extends shelf life and battery runtime in maintenance-free deployments like smart meters and remote sensors. |
| Hardware Write Protection | WP pin provides tamper-resistant locking of protected sectors - prevents accidental or malicious overwrite of bootloader or calibration data. |
Applications
| Industrial PLC Firmware Storage | Medical Sensor Configuration Memory |
|---|---|
Use Scenario: Storing firmware images and versioned control logic in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Non-volatile code storage with fast read access and selective block erase - enabling safe in-field firmware upgrades without halting production lines. Use Value: 100,000-cycle endurance and 20-year data retention ensure long-term reliability; Dual-I/O read reduces boot latency by ~40% vs. standard SPI. | Use Scenario: Holding calibrated sensor coefficients, patient-specific thresholds, and audit logs in portable diagnostic devices operating on coin-cell batteries. IC Role / Device Role / Timing Role: Low-power data logger and configuration store - accessed infrequently but requiring guaranteed integrity across temperature extremes. Use Value: 200 nA ultra-deep power-down current extends battery life beyond 5 years; OTP register secures calibration keys against unauthorized modification. |
| Automotive Telematics Bootloader | Smart Home Gateway Parameter Storage |
Use Scenario: Hosting secure bootloader and signed firmware partitions in vehicle telematics control units subject to AEC-Q100 stress requirements. IC Role / Device Role / Timing Role: Trusted code execution anchor with hardware write protection - isolating bootloader from application-level corruption risks. Use Value: WP pin + sector protection registers prevent rollback attacks; 1.65–3.6 V operation accommodates automotive battery transients without external regulators. | Use Scenario: Storing Wi-Fi credentials, Zigbee mesh topology data, and user preferences in battery-backed home automation hubs. IC Role / Device Role / Timing Role: Persistent configuration manager with fast random-access reads and atomic page writes - supporting seamless network reconnection after power loss. Use Value: 256-byte page erase enables rapid credential updates without disturbing adjacent settings; SOIC-8 footprint simplifies layout in space-constrained enclosures. |
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, 1.7–2.0 V supply only; no OTP register; 100 µA standby current. | Lacks OTP security and ultra-low deep power-down - unsuitable for secure or battery-critical designs. | Select when maximum read speed is prioritized over security and ultra-low power. |
| Micron MT25QL02G | 2 Gbit density (1000× larger), quad-I/O support, 133 MHz, 1.7–2.0 V; requires QSPI controller; no OTP. | Over-specified capacity and interface complexity - increases BOM cost and firmware overhead for simple 2-Mbit use cases. | Select only if future scalability to larger code images is mandatory and QSPI infrastructure exists. |
Compared with W25Q20EW and MT25QL02G, the AT25DF021A-DWF delivers optimal balance of security (OTP), ultra-low power (200 nA), and SPI compatibility - making it ideal for cost-sensitive, battery-powered, and firmware-secure embedded systems where 2 Mbit capacity is sufficient.
Availability
AT25DF021A-DWF is available at Aetrix Electronics and suitable for industrial PLCs, medical sensors, automotive telematics units, and smart home gateways requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for AT25DF021A-DWF 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 microcontrollers, analog, power, and memory solutions for automotive, industrial, and IoT markets.
The AT25DF021A-DWF belongs to Renesas' serial Flash memory product line, engineered for reliable code and data storage in space- and power-constrained embedded systems with emphasis on security, low-voltage operation, and industrial temperature resilience.
FAQ
What is the operating voltage range for the AT25DF021A-DWF?
The AT25DF021A-DWF operates from 1.65 V to 3.6 V across the full industrial temperature range (–40°C to +85°C). This wide supply range eliminates the need for external voltage regulation in mixed-voltage systems and ensures compatibility with both 1.8 V and 3.3 V microcontroller I/O domains. No separate programming voltage is required - all operations, including erase and program, execute within this single supply rail.
Does the AT25DF021A-DWF support dual-I/O read operations?
Yes, the AT25DF021A-DWF supports Dual-Output Read commands using SI (I/O0) and SO (I/O1) pins simultaneously, delivering two bits per SCK falling edge. This doubles effective read bandwidth compared to standard single-I/O SPI, reducing firmware load time and improving OTA update verification speed. Dual-I/O mode is enabled via specific opcodes (e.g., 3Bh) and requires host controller support for dual-line timing.
What is the purpose of the OTP security register in the AT25DF021A-DWF?
The AT25DF021A-DWF includes a 128-byte One-Time Programmable (OTP) security register: 64 bytes are factory-programmed with a unique identifier, and 64 bytes are user-programmable. This register supports secure device serialization, Electronic Serial Number (ESN) storage, locked cryptographic key storage, and anti-counterfeiting measures - all implemented in hardware with irreversible write capability.
How does the AT25DF021A-DWF handle power-down modes?
The AT25DF021A-DWF offers two ultra-low-power states: Deep Power-Down (4.5 µA typical) and Ultra-Deep Power-Down (200 nA typical). Both are entered via dedicated commands and exited via CS toggle or reset. These modes preserve memory contents while minimizing current draw - critical for battery-powered applications such as remote sensors and wearable medical devices where multi-year operation is required.
Is the AT25DF021A-DWF pin-compatible with other SOIC-8 serial Flash devices?
The AT25DF021A-DWF uses standard SOIC-8 pinout (CS, SO, WP, GND, VCC, HOLD, SCK, SI) matching JEDEC MS-012AC, making it mechanically and electrically compatible with most 8-pin SPI Flash footprints. However, command sets, status register formats, and feature enablement differ - firmware integration requires validation against the AT25DF021A-DWF datasheet, not generic SPI Flash assumptions.
AT25DF021A-DWF 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:
- 104 MHz
- Write Cycle Time - Word, Page:
- 8µs, 2.5ms
- 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:
- Wafer
AT25DF021A-DWF FAQ
1.How can I place an order for AT25DF021A-DWF through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25DF021A-DWF 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-DWF reliable?
The price and inventory of AT25DF021A-DWF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25DF021A-DWF is usually 5 days.
3.What payment methods are accepted for AT25DF021A-DWF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25DF021A-DWF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25DF021A-DWF?
AT25DF021A-DWF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25DF021A-DWF 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-DWF?
For technical support, including AT25DF021A-DWF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25DF021A-DWF requirements.
6.How does Aetrix verify that AT25DF021A-DWF is sourced from the original manufacturer or authorized distributors?
All AT25DF021A-DWF 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-DWF meets industry standards.
7.What is the process for return or replacement of AT25DF021A-DWF?
All AT25DF021A-DWF units undergo pre-shipment inspection (PSI). If there is an issue with AT25DF021A-DWF, 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-DWF part is unused and in its original packaging.
Return procedure for AT25DF021A-DWF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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