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Renesas AT25DF021A-SSHNHR-T
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- Part No.:
- AT25DF021A-SSHNHR-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25DF021A-SSHNHR-T.pdf
- Description:
- IC FLASH 2MBIT SPI 85MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,771
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Product details
Overview
AT25DF021A-SSHNHR-T 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) for embedded code + data storage in industrial and consumer systems.
For engineers reviewing the AT25DF021A-SSHNHR-T datasheet, AT25DF021A-SSHNHR-T pinout, AT25DF021A-SSHNHR-T application, or AT25DF021A-SSHNHR-T equivalent, key selection criteria include SPI Mode 0/3 compatibility, ultra-low deep power-down current (200 nA), OTP security register (128 bytes), hardware write protection via WP pin, and industrial temperature support (–40°C to +125°C).
Technical Context
The AT25DF021A-SSHNHR-T implements a standard SPI interface with dual I/O read capability, enabling two bits per SCK falling edge to double effective throughput versus single-I/O modes. Its command set includes dedicated Dual-Output Read (0Bh), Dual-Input Program (3Bh), and sequential program mode for efficient burst writes.
Internally, the device integrates SRAM data buffers, Y/X decoders, and control logic managing sector protection, status register polling, and automatic erase/program failure detection. The OTP security register contains 64 bytes factory-programmed with a unique identifier and 64 bytes user-programmable for secure serialization or key storage.
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 space-constrained MCU-based designs. |
| Supply Voltage Range | 1.65 V – 3.6 V (–40°C to +85°C); 1.7 V – 3.6 V (–40°C to +125°C) - enables direct interfacing with 1.8 V and 3.3 V microcontrollers without level shifters. |
| Max Clock Frequency | 104 MHz - supports high-speed read access with minimal latency in real-time applications. |
| Read Latency (tV) | 6 ns - ensures rapid instruction fetch and data retrieval critical for deterministic system response. |
| Erase Granularity | 256-byte page, 4/32/64-kByte uniform blocks - allows precise in-field firmware updates and data logging without erasing unrelated sectors. |
| OTP Security Register | 128 bytes total (64-byte factory ID + 64-byte user programmable) - provides tamper-resistant device identity and cryptographic key storage. |
| Deep Power-Down Current | 200 nA typical - extends battery life in always-on IoT sensors and portable devices during sleep states. |
Pinout & Package
AT25DF021A-SSHNHR-T is packaged in an 8-lead SOIC (150-mil) with industry-standard pinout and JEDEC-compliant footprint. This package supports reflow soldering and offers mechanical robustness for industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must transition low-to-high to complete commands and enter standby mode after internal operations. |
| SCK | Serial Clock | Master-generated clock; rising edge latches SI input, falling edge clocks SO output - defines timing for all SPI transactions. |
| SI (I/O0) | Serial Input / Dual-I/O Data 0 | Primary command/address/data input; becomes bidirectional I/O0 during Dual-I/O reads to support parallel bit transfer. |
| SO (I/O1) | Serial Output / Dual-I/O Data 1 | Standard output for read data; functions as I/O1 in Dual-I/O mode to deliver second bit per SCK cycle. |
| WP | Write Protect | Hardware lock control; low assertion disables programming/erasing of protected sectors - complements software-based protection registers. |
| HOLD | Hold Control | Pauses ongoing SPI communication without deselecting device; requires CS asserted and SCK low to activate - preserves state during interrupt servicing. |
| VCC | Power Supply | Single supply rail (1.65–3.6 V); powers all internal logic and memory array - eliminates need for auxiliary voltage rails. |
| GND | Ground Reference | Common return path for VCC and I/O signals; must be low-impedance connection to minimize noise coupling into sensitive flash operations. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-I/O Read Support | Enables 2-bit-per-clock read transfers using SI and SO pins simultaneously, doubling effective bandwidth over standard SPI without requiring additional I/O lines. |
| Flexible Erase Architecture | Supports page (256 B), 4-kB, 32-kB, 64-kB, and full-chip erase - minimizes wasted space and enables granular firmware updates in resource-limited embedded systems. |
| Hardware Write Protection | WP pin provides physical, non-volatile locking of protected sectors - prevents accidental or malicious overwrite even if software fails or is compromised. |
| Ultra-Low Deep Power-Down | 200 nA typical current draw in ultra-deep power-down mode - extends operational lifetime in battery-powered edge nodes and wearables. |
| Factory-Programmed Unique ID | 64-byte factory-unique identifier stored in OTP register - enables secure device authentication, license enforcement, and anti-counterfeiting in production systems. |
Applications
| Industrial PLC Firmware Storage | Automotive Infotainment Boot Memory |
|---|---|
Use Scenario: Storing firmware images and configuration parameters in programmable logic controllers operating in harsh environments with wide temperature swings. IC Role / Device Role / Timing Role: Non-volatile boot memory providing fast, reliable code shadowing to RAM at power-up; supports field updates via 4-kB block erase. Use Value: Industrial temperature rating (–40°C to +125°C), hardware WP pin, and 20,000 P/E cycles ensure long-term reliability in unattended deployments. | Use Scenario: Hosting boot code and UI assets for head-unit systems requiring rapid startup and secure firmware validation. IC Role / Device Role / Timing Role: Primary SPI Flash for storing signed bootloader and OS kernel; leverages OTP register for secure key storage and device binding. Use Value: 104 MHz read speed and 6 ns tV reduce boot time; Dual-I/O mode accelerates asset loading; 20-year data retention guarantees longevity across vehicle lifecycle. |
| IoT Edge Sensor Configuration | Medical Wearable Data Logger |
Use Scenario: Storing calibration tables, sensor fusion algorithms, and network credentials in compact, battery-operated environmental monitors. IC Role / Device Role / Timing Role: Persistent configuration and runtime data storage; uses 256-byte page erase for frequent parameter updates without disturbing firmware. Use Value: Ultra-deep power-down (200 nA) extends multi-year battery life; small SOIC package fits tight board areas; SPI compatibility simplifies MCU integration. | Use Scenario: Recording physiological measurements and timestamps in FDA-cleared wearable patches requiring traceable, tamper-evident storage. IC Role / Device Role / Timing Role: Secure, low-power data buffer with encrypted metadata; utilizes OTP register for device-specific keys and serial number binding. Use Value: 128-byte OTP security register enables HIPAA-compliant data integrity; 25 µA standby current supports continuous monitoring; RoHS-compliant green packaging meets medical regulatory requirements. |
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, 1.65–1.95 V supply only; no OTP register; 100,000 P/E cycles at +85°C only. | Lacks factory-unique ID and user-programmable OTP; optimized for cost-sensitive consumer electronics rather than secure industrial use. | Select when maximum clock speed and lowest unit cost are prioritized over security features and extended temperature operation. |
| Macronix MX25L2006E | 2 Mbit density, 80 MHz max clock, 2.7–3.6 V supply; includes 128-byte OTP but no ultra-deep power-down mode (min 1 µA). | Higher active current and narrower voltage range limit suitability for battery-powered or mixed-voltage designs. | Choose when legacy 3.3 V system compatibility and basic OTP functionality are required, but ultra-low sleep current is not critical. |
Compared with W25Q20EW and MX25L2006E, the AT25DF021A-SSHNHR-T uniquely combines industrial temperature support (–40°C to +125°C), ultra-deep power-down (200 nA), and factory-programmed unique ID in a single 8-SOIC package - making it optimal for secure, long-life, energy-constrained embedded systems.
Availability
AT25DF021A-SSHNHR-T is available at Aetrix Electronics and suitable for industrial automation, automotive infotainment, and medical wearable applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AT25DF021A-SSHNHR-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 delivering trusted microcontrollers, analog, power, and memory solutions for automotive, industrial, infrastructure, and IoT markets.
The AT25DF021A belongs to Renesas' serial Flash memory product line, engineered for high-reliability embedded code and data storage with integrated security, low-power operation, and broad voltage/temperature compatibility.
FAQ
What is the operating temperature range supported by the AT25DF021A-SSHNHR-T?
The AT25DF021A-SSHNHR-T supports two industrial temperature grades: –40°C to +85°C with 1.65–3.6 V supply, and –40°C to +125°C with 1.7–3.6 V supply. This dual-range capability allows deployment in demanding environments such as under-hood automotive modules and factory-floor PLCs where thermal stability is critical. The AT25DF021A-SSHNHR-T maintains full specification compliance across both ranges without derating.
Does the AT25DF021A-SSHNHR-T support SPI Mode 0 and Mode 3 exclusively?
Yes, the AT25DF021A-SSHNHR-T is explicitly designed to support only SPI Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 1), as confirmed in its datasheet Features section. It does not support Mode 1 or Mode 2. The AT25DF021A-SSHNHR-T's SCK timing aligns precisely with these two modes: data is latched on the rising edge of SCK and output on the falling edge, ensuring interoperability with standard SPI controllers configured for either mode.
How does the hardware write protection (WP pin) interact with software sector protection on the AT25DF021A-SSHNHR-T?
The WP pin on the AT25DF021A-SSHNHR-T provides hardware-level locking that overrides software protection settings when asserted low - preventing any program or erase command execution on protected sectors regardless of status register configuration. Software protection remains active when WP is high or floating. This dual-layer mechanism ensures fail-safe write inhibition in safety-critical systems. The AT25DF021A-SSHNHR-T datasheet specifies this behavior in Section 9.7 and Table 7.
What is the purpose and structure of the OTP security register in the AT25DF021A-SSHNHR-T?
The AT25DF021A-SSHNHR-T includes a 128-byte One-Time Programmable (OTP) security register divided into two 64-byte sections: the first is factory-programmed with a unique device identifier, and the second is user-programmable for keys, certificates, or custom serialization. Once programmed, OTP bytes cannot be erased or rewritten. This register supports secure boot, anti-cloning, and device authentication. The AT25DF021A-SSHNHR-T implements dedicated Program OTP and Read OTP commands (per Section 10 of the datasheet) to manage this feature.
Can the AT25DF021A-SSHNHR-T be used in battery-powered applications requiring multi-year operation?
Yes, the AT25DF021A-SSHNHR-T is well-suited for long-life battery applications due to its ultra-deep power-down current of 200 nA typical and 4.5 µA deep power-down current. Combined with 25 µA standby current and support for 1.65 V operation, it enables multi-year operation in coin-cell or energy-harvesting systems. Real-world design examples include wireless sensor nodes and medical patches where the AT25DF021A-SSHNHR-T stores firmware and logs while minimizing quiescent load.
AT25DF021A-SSHNHR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 2Mbit
- Memory Organization:
- 256K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 85 MHz
- Write Cycle Time - Word, Page:
- 8µs, 2.5ms
- Access Time:
- -
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25DF021A-SSHNHR-T FAQ
1.How can I place an order for AT25DF021A-SSHNHR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25DF021A-SSHNHR-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 AT25DF021A-SSHNHR-T reliable?
The price and inventory of AT25DF021A-SSHNHR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25DF021A-SSHNHR-T is usually 5 days.
3.What payment methods are accepted for AT25DF021A-SSHNHR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25DF021A-SSHNHR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25DF021A-SSHNHR-T?
AT25DF021A-SSHNHR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25DF021A-SSHNHR-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 AT25DF021A-SSHNHR-T?
For technical support, including AT25DF021A-SSHNHR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25DF021A-SSHNHR-T requirements.
6.How does Aetrix verify that AT25DF021A-SSHNHR-T is sourced from the original manufacturer or authorized distributors?
All AT25DF021A-SSHNHR-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 AT25DF021A-SSHNHR-T meets industry standards.
7.What is the process for return or replacement of AT25DF021A-SSHNHR-T?
All AT25DF021A-SSHNHR-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25DF021A-SSHNHR-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 AT25DF021A-SSHNHR-T part is unused and in its original packaging.
Return procedure for AT25DF021A-SSHNHR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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