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Renesas AT45DB021D-SH-T
- Part No.:
- AT45DB021D-SH-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT45DB021D-SH-T.pdf
- Description:
- IC FLASH 2MBIT SPI 66MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,236
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Product details
Overview
AT45DB021D-SH-T from Adesto Technologies (acquired by Dialog Semiconductor, now part of Renesas) is a 2-Mbit serial DataFlash memory IC with RapidS™ SPI-compatible interface, supporting up to 66 MHz clock frequency, 256/264-byte page size, and industrial temperature range (–40°C to +85°C). It integrates one 256/264-byte SRAM buffer, supports page/block/sector/chip erase, and delivers 7 mA active read current for embedded code shadowing and firmware storage applications.
For engineers reviewing the AT45DB021D-SH-T datasheet, AT45DB021D-SH-T pinout, AT45DB021D-SH-T application, or AT45DB021D-SH-T equivalent, key selection criteria include its dual-page-size flexibility (256 vs. 264 bytes), hardware write protection (WP pin), sector lockdown security, 100,000 program/erase cycles, and continuous array read capability ideal for boot code execution.
Technical Context
The AT45DB021D-SH-T implements a serial flash architecture with separate main memory array (1,024 pages × 256/264 bytes) and dedicated 256/264-byte SRAM buffer, enabling concurrent buffer loading and main memory programming. Its RapidS interface supports SPI modes 0 and 3 with no external high-voltage programming required.
It features three-tiered erase granularity-page (256 B), block (2 KB), sector (32 KB), and chip (2 Mbit)-with self-timed operations and status register polling. Security includes a 128-byte register (64-byte user programmable + 64-byte unique device ID) and hardware/software sector protection via WP pin and Sector Protection Register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 2,097,152 bits (2 Mbit), organized as 1,024 pages of 256 or 264 bytes each |
| Interface | RapidS™ serial interface, SPI-compatible Modes 0 and 3, up to 66 MHz clock frequency |
| Supply Voltage | 2.7 V to 3.6 V single supply - enables direct integration into 3.3 V systems without level shifting |
| Active Read Current | 7 mA typical - supports low-power firmware fetch in battery-backed or energy-constrained designs |
| Standby Current | 25 μA typical - minimizes quiescent power during idle periods in always-on embedded systems |
| Data Retention | 20 years - ensures long-term reliability for firmware, calibration data, and configuration storage |
| Endurance | 100,000 program/erase cycles per page - suitable for field-upgradable firmware with frequent minor updates |
Pinout & Package
AT45DB021D-SH-T is housed in an 8-pin SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch), RoHS-compliant and halide-free. Pin functions are fully defined per JEDEC MS-012AC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; initiates command sequence on high-to-low transition and terminates operation on low-to-high transition |
| SCK | Serial Clock | Input clock controlling data timing; commands and addresses latched on rising edge, SO data output on falling edge |
| SI | Serial Input | Command, address, and data input line; all data shifted in MSB-first on SCK rising edge |
| SO | Serial Output | Data output line for read operations; tri-stated when CS is high |
| WP | Write Protect | Hardware-level sector protection override; asserts low to lock protected sectors regardless of software settings |
| RESET | Reset Input | Active-low asynchronous reset; terminates ongoing operations and returns state machine to idle |
| VCC | Power Supply | 2.7–3.6 V supply input; powers all internal logic and memory arrays |
| GND | Ground Reference | System ground return path; required for stable operation and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| User-configurable page size | Factory-set to 256-byte "power-of-two" mode or field-selectable 264-byte DataFlash standard mode for optimal alignment with legacy or optimized firmware layouts |
| Continuous array read | Enables seamless code shadowing: automatic address wrap-around across page and array boundaries eliminates CPU intervention during sequential boot code fetch |
| Dual erase hierarchy | Page (256 B), block (2 KB), sector (32 KB), and chip (2 Mbit) erase options allow precise wear leveling and partial firmware updates without full reflash |
| Hardware + software protection | Independent WP pin control and Sector Protection Register enable layered security: physical lockout plus configurable software-defined sector lockdown |
| SRAM data buffer | 256/264-byte internal buffer allows background data preparation while main memory remains available for reads - improves system concurrency |
Applications
| Boot Code Storage | Firmware Update Storage |
|---|---|
Use Scenario: Storing primary bootloader or application startup code in microcontroller-based systems requiring fast, reliable nonvolatile storage. IC Role / Device Role / Timing Role: Serial Flash memory providing sequential instruction fetch via Continuous Array Read at up to 66 MHz for zero-wait-state execution. Use Value: Eliminates need for external parallel NOR flash or RAM-based shadowing; reduces BOM count and PCB area while maintaining deterministic boot timing. | Use Scenario: Holding over-the-air (OTA) firmware images prior to validation and installation in IoT edge nodes or industrial controllers. IC Role / Device Role / Timing Role: Nonvolatile staging buffer with sector-lockdown capability to prevent corruption during partial writes or power loss. Use Value: Enables atomic firmware update using page- and block-erase granularity, ensuring rollback safety and eliminating risk of bricking due to interrupted writes. |
| Configuration & Calibration Data | Audio/Log Data Buffering |
Use Scenario: Retaining device-specific calibration constants, network credentials, or user preferences across power cycles in medical or test equipment. IC Role / Device Role / Timing Role: Low-power, high-endurance serial flash used for infrequent but critical parameter storage with 20-year data retention. Use Value: Supports 100,000+ write cycles per page - exceeds lifetime requirements for calibration updates in field-deployed instruments. | Use Scenario: Capturing sensor logs or short audio clips in portable diagnostic tools where burst-write performance and low standby current are essential. IC Role / Device Role / Timing Role: High-speed buffer-assisted write path: data loaded into SRAM buffer first, then committed to main memory with built-in erase. Use Value: Achieves faster effective write throughput than conventional SPI flash by decoupling host data transfer from memory programming latency. |
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 Quad SPI (QSPI) interface, 104 MHz max clock, no SRAM buffer, fixed 256-byte pages | Lacks continuous array read and buffer-assisted programming; requires QSPI controller support | Choose for higher throughput in QSPI-capable systems where buffer concurrency is not needed |
| Macronix MX25L2006E | 2 Mbit standard SPI, 80 MHz max clock, no SRAM buffer, supports 4-byte addressing only above 16 MB | No page-size flexibility or sector lockdown; relies solely on software write protection | Choose for cost-sensitive designs needing basic SPI flash compatibility without advanced DataFlash features |
Compared with AT45DB021D-SH-T, W25Q20EW offers higher bandwidth but sacrifices buffer-assisted programming and continuous read simplicity, while MX25L2006E provides broader vendor support but lacks hardware write protection and secure sector lockdown - making AT45DB021D-SH-T uniquely suited for secure, low-power, buffer-optimized firmware storage.
Availability
AT45DB021D-SH-T is available at Aetrix Electronics and suitable for boot code storage, firmware update staging, and configuration data retention requiring stable component supply, long-term lifecycle assurance, and industrial-grade reliability.
Supply support for AT45DB021D-SH-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
Adesto Technologies developed the DataFlash family for high-reliability, low-pin-count serial flash applications before its acquisition by Dialog Semiconductor in 2020 and subsequent integration into Renesas Electronics.
The AT45DB021D-SH-T belongs to the DataFlash® product line, designed specifically for embedded systems requiring fast sequential access, flexible erase granularity, and integrated security features - targeting code shadowing, OTA update buffering, and secure parameter storage.
FAQ
What is the maximum clock frequency supported by the AT45DB021D-SH-T for continuous array read operations?
The AT45DB021D-SH-T supports continuous array read at up to 66 MHz using opcodes E8H (legacy mode) or 0BH (high-frequency mode), as specified by the fCAR1 parameter. This enables real-time code shadowing in high-speed microcontroller applications without wait states. The 03H low-frequency mode supports up to 33 MHz without dummy byte overhead. All modes maintain seamless page boundary crossing and array wraparound behavior.
Does the AT45DB021D-SH-T require external high-voltage programming signals?
No, the AT45DB021D-SH-T operates entirely from a single 2.7 V to 3.6 V supply for both read and program/erase operations. All internal programming voltages are generated on-chip, eliminating the need for external charge pumps or high-voltage generators. This simplifies power design and enhances system reliability in space-constrained or low-noise environments where AT45DB021D-SH-T is commonly deployed.
How does the SRAM buffer in the AT45DB021D-SH-T improve system performance?
The AT45DB021D-SH-T includes a dedicated 256/264-byte SRAM buffer that enables concurrent operations: while the host loads new data into the buffer via SI, the main memory remains available for reads or other background tasks. This decouples data ingestion from memory programming latency, reducing effective write time and improving real-time responsiveness - especially valuable in firmware update and logging applications using AT45DB021D-SH-T.
Can the AT45DB021D-SH-T be used in industrial temperature environments?
Yes, the AT45DB021D-SH-T is rated for the industrial temperature range of –40°C to +85°C and qualified per AEC-Q100 stress test standards for reliability. Its low-power operation (25 μA standby, 15 μA deep power-down) and robust erase/write endurance (100,000 cycles) make it suitable for deployment in harsh environments such as factory automation controllers, outdoor telemetry units, and automotive body electronics where AT45DB021D-SH-T serves as trusted nonvolatile storage.
What security features does the AT45DB021D-SH-T provide for protecting firmware or configuration data?
The AT45DB021D-SH-T provides multi-layer security: a 128-byte Security Register (64-byte user-programmable + 64-byte unique device ID), individual sector lockdown, hardware write protection via the WP pin (active-low, independent of software), and software-controlled sector protection. These features allow secure partitioning of boot code, application firmware, and sensitive parameters - ensuring integrity and confidentiality in systems relying on AT45DB021D-SH-T for critical storage.
AT45DB021D-SH-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 2Mbit
- Memory Organization:
- 264 Bytes x 1024 pages
- Memory Interface:
- SPI
- Clock Frequency:
- 66 MHz
- Write Cycle Time - Word, Page:
- 4ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT45DB021D-SH-T FAQ
1.How can I place an order for AT45DB021D-SH-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB021D-SH-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 AT45DB021D-SH-T reliable?
The price and inventory of AT45DB021D-SH-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB021D-SH-T is usually 5 days.
3.What payment methods are accepted for AT45DB021D-SH-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB021D-SH-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB021D-SH-T?
AT45DB021D-SH-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB021D-SH-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 AT45DB021D-SH-T?
For technical support, including AT45DB021D-SH-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB021D-SH-T requirements.
6.How does Aetrix verify that AT45DB021D-SH-T is sourced from the original manufacturer or authorized distributors?
All AT45DB021D-SH-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 AT45DB021D-SH-T meets industry standards.
7.What is the process for return or replacement of AT45DB021D-SH-T?
All AT45DB021D-SH-T units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB021D-SH-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 AT45DB021D-SH-T part is unused and in its original packaging.
Return procedure for AT45DB021D-SH-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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