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Renesas AT45DB021D-MH-Y
- Part No.:
- AT45DB021D-MH-Y
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-UDFN Exposed Pad
- Datasheet:
-
AT45DB021D-MH-Y.pdf
- Description:
- IC FLASH 2MBIT SPI 66MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,257
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Product details
Overview
AT45DB021D-MH-Y from Adesto Technologies (acquired by Dialog Semiconductor, now part of Renesas) is a 2-Mbit serial DataFlash memory IC with RapidS™ SPI-compatible interface, 256/264-byte page architecture, and single 2.7–3.6V supply. It delivers up to 66MHz read throughput, supports continuous array read for code shadowing, and integrates one 256/264-byte SRAM buffer for efficient read-modify-write operations in embedded firmware storage applications.
For engineers reviewing the AT45DB021D-MH-Y datasheet, AT45DB021D-MH-Y pinout, AT45DB021D-MH-Y application, or AT45DB021D-MH-Y equivalent, key selection criteria include page-size configurability (256 vs. 264 bytes), sector-level hardware/software write protection, industrial temperature operation (−40°C to +85°C), and support for multiple erase granularities (page/block/sector/chip) without high-voltage programming.
Technical Context
The AT45DB021D-MH-Y implements a dual-layer memory architecture: 1,024 pages × 256/264 bytes of main Flash array plus one dedicated 256/264-byte SRAM buffer. Its RapidS interface supports SPI Modes 0 and 3 at up to 66MHz, enabling high-speed sequential access without address lines-reducing pin count and layout complexity versus parallel Flash.
All program and erase operations are self-timed and require no external high-voltage supply. The device uses a three-wire serial interface (CS/SI/SO/SCK) with hardware write protection (WP pin) and reset control (RESET), and includes a 128-byte security register with 64-byte user-programmable space and unique 64-byte device ID for secure firmware storage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 bytes), organized as 1,024 pages of 256 or 264 bytes each |
| Interface Speed | Up to 66 MHz SCK for Continuous Array Read (0BH/E8H opcodes); supports SPI Modes 0 and 3 |
| Supply Voltage | 2.7 V to 3.6 V - enables direct integration into 3.3V systems without level-shifting |
| Power Consumption | 7 mA typical active read current; 25 μA standby; 15 μA deep power-down - suitable for battery-backed or low-power IoT nodes |
| Erase Granularity | Page (256 B), Block (2 KB), Sector (32 KB), Chip (2 Mbit) - allows fine-grained firmware updates without full reflash |
| Data Retention | 20 years minimum - validated for long-life industrial firmware storage |
| Endurance | 100,000 program/erase cycles per page - supports frequent field firmware upgrades |
Pinout & Package
AT45DB021D-MH-Y 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-012AA and confirmed in the official datasheet revision 3638L–DFLASH–1/2013.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; falling edge initiates command sequence; rising edge terminates operation and triggers self-timed execution |
| SCK | Serial Clock | Input clock controlling data latching (SI on rising edge) and output timing (SO on falling edge) |
| SI | Serial Input | Command, address, and data input path; MSB-first protocol; supports all instruction opcodes and address sequences |
| SO | Serial Output | Command-status, memory/buffer data, and ID register readout; tri-stated when CS is high |
| WP | Write Protect | Hardware lock: low state blocks program/erase on protected sectors regardless of software settings; internally pulled high |
| RESET | Reset Input | Active-low hard reset; terminates ongoing operations and returns state machine to idle; internal POR eliminates external RC network |
| VCC | Power Supply | Single 2.7–3.6V supply for all operations - no charge pump or VPP required |
| GND | Ground Reference | System ground return; decoupling capacitor placement critical for noise immunity during high-speed reads |
Key Features
| Feature | Design Value |
|---|---|
| Configurable Page Size | Factory-set 256-byte or 264-byte pages - enables alignment with legacy EEPROM emulation or optimized code-fetch boundaries |
| Continuous Array Read | Seamless wrap-around across page and array boundaries at up to 66MHz - eliminates CPU intervention during boot code shadowing |
| Dual Erase Protection | Independent hardware (WP pin) and software (Sector Protection Register) control - prevents accidental corruption of bootloader or calibration data |
| Security Register | 128-byte dedicated register with 64-byte user space + unique 64-byte device ID - supports secure firmware signing and device authentication |
| Industrial Temp Range | −40°C to +85°C operation - qualified for automotive body electronics, industrial HMIs, and outdoor sensor gateways |
Applications
| Firmware Storage | Boot Code Shadowing |
|---|---|
Use Scenario: Storing and updating microcontroller firmware images in resource-constrained embedded systems. IC Role / Device Role / Timing Role: Nonvolatile program memory holding application binaries, updated via in-system programming over SPI. Use Value: 100,000 endurance cycles and 20-year retention ensure reliable field upgrades across product lifetime without wear leveling overhead. | Use Scenario: Accelerating MCU boot time by copying executable code from Flash to RAM before execution. IC Role / Device Role / Timing Role: High-throughput serial source for contiguous instruction fetch, leveraging Continuous Array Read mode. Use Value: 66MHz read speed and automatic page-wrap eliminate wait states and reduce boot latency by >40% vs. standard SPI Flash. |
| Secure Configuration Storage | Industrial Data Logging |
Use Scenario: Storing calibrated sensor offsets, cryptographic keys, and device-specific credentials in tamper-resistant memory. IC Role / Device Role / Timing Role: Secure nonvolatile storage with hardware write lock (WP) and sector lockdown capability. Use Value: 128-byte security register with unique device ID enables cryptographic binding and prevents unauthorized configuration cloning. | Use Scenario: Recording timestamped sensor readings in remote monitoring equipment with limited power budget. IC Role / Device Role / Timing Role: Low-power persistent storage supporting burst writes and long-term archival at −40°C to +85°C. Use Value: 15μA deep power-down current and industrial temp rating extend battery life in unattended deployments beyond 5 years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| W25Q20EW | 2 Mbit Quad SPI (QSPI) Flash; 133 MHz max clock; no integrated SRAM buffer; no page-size configurability | Lacks built-in buffer for read-modify-write; requires external logic or host-side emulation for EEPROM-like byte updates | Choose W25Q20EW only if QSPI bandwidth and smaller footprint outweigh need for buffer-assisted atomic updates. |
| MX25L2006E | 2 Mbit standard SPI Flash; 80 MHz max clock; no configurable page size; no security register or device ID | No hardware write protection pin; no sector lockdown; no unique identifier - unsuitable for secure firmware deployment | Select MX25L2006E where cost is primary and security, endurance, and buffer-assisted programming are not required. |
Compared with W25Q20EW and MX25L2006E, AT45DB021D-MH-Y uniquely combines SRAM buffer-based atomic page programming, factory-configurable 256/264-byte pages, and integrated security features - making it optimal for secure, field-upgradable embedded firmware where reliability and update safety are critical.
Availability
AT45DB021D-MH-Y is available at Aetrix Electronics and suitable for firmware storage, boot code shadowing, secure configuration management, and industrial data logging requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AT45DB021D-MH-Y 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 designed ultra-low-power, high-reliability serial Flash and nonvolatile memory solutions before its acquisition by Dialog Semiconductor in 2020; Dialog was subsequently acquired by Renesas Electronics in 2021.
The AT45DB021D-MH-Y belongs to the DataFlash® family - engineered specifically for embedded systems needing SPI-based Flash with integrated buffer, flexible erase, and security features - targeting applications where code integrity, field upgrade safety, and power efficiency are mandatory.
FAQ
What is the maximum clock frequency supported by AT45DB021D-MH-Y for continuous array read operations?
The AT45DB021D-MH-Y supports up to 66 MHz for Continuous Array Read using opcodes 0BH (High Frequency Mode) and E8H (Legacy Command), as specified by the fCAR1 parameter in the datasheet. This applies to both 256-byte and 264-byte page configurations. The lower-frequency 03H command supports up to 33 MHz without dummy byte overhead. All timing values are guaranteed across the industrial temperature range (−40°C to +85°C) and 2.7–3.6V supply.
Does AT45DB021D-MH-Y require a high-voltage programming supply?
No, AT45DB021D-MH-Y operates entirely from a single 2.7–3.6V supply for all read, program, and erase operations. It contains no charge pump or VPP pin and does not require external high-voltage generation. Programming and erasing are fully self-timed, with internal circuitry managing voltage levels - simplifying system design and eliminating level-shifters or auxiliary power rails.
How is page size configured on AT45DB021D-MH-Y - can it be changed in-circuit?
The page size (256-byte vs. 264-byte) of AT45DB021D-MH-Y is factory-configured and fixed for a given unit; it cannot be altered in-circuit or via software command. The configuration determines internal addressing schemes (e.g., A17–A0 vs. PA9–PA0/BA8–BA0) and buffer access behavior. Users must select the appropriate variant (e.g., AT45DB021D-MH-Y for 256-byte pages) at procurement based on system firmware alignment requirements.
What hardware protection mechanisms does AT45DB021D-MH-Y provide against accidental writes?
AT45DB021D-MH-Y provides dual-layer write protection: (1) Hardware via the WP pin - asserting WP low disables all program/erase commands on protected sectors regardless of software state; (2) Software via the Sector Protection Register and Sector Lockdown command - allowing selective, persistent locking of individual sectors. Both mechanisms operate independently and concurrently, ensuring robust defense against firmware corruption during power glitches or software faults.
Is AT45DB021D-MH-Y compatible with standard SPI controllers without custom driver development?
Yes, AT45DB021D-MH-Y is fully SPI Mode 0 and Mode 3 compatible and uses standard MOSI/MISO/SCLK/SS signaling - requiring only minor opcode and timing adjustments versus generic SPI Flash. Standard SPI peripherals (e.g., STM32 SPI, PIC MSSP, ESP32 SPI) can drive AT45DB021D-MH-Y using existing HAL libraries with minimal modification to handle RapidS-specific opcodes (e.g., 0BH, 83H) and status polling. No proprietary controller or protocol stack is needed.
AT45DB021D-MH-Y Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-UDFN Exposed Pad
- Packaging:
- Tray
- 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-UDFN (5x6)
AT45DB021D-MH-Y FAQ
1.How can I place an order for AT45DB021D-MH-Y through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB021D-MH-Y 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-MH-Y reliable?
The price and inventory of AT45DB021D-MH-Y are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB021D-MH-Y is usually 5 days.
3.What payment methods are accepted for AT45DB021D-MH-Y?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB021D-MH-Y transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB021D-MH-Y?
AT45DB021D-MH-Y orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB021D-MH-Y 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-MH-Y?
For technical support, including AT45DB021D-MH-Y datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB021D-MH-Y requirements.
6.How does Aetrix verify that AT45DB021D-MH-Y is sourced from the original manufacturer or authorized distributors?
All AT45DB021D-MH-Y 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-MH-Y meets industry standards.
7.What is the process for return or replacement of AT45DB021D-MH-Y?
All AT45DB021D-MH-Y units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB021D-MH-Y, 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-MH-Y part is unused and in its original packaging.
Return procedure for AT45DB021D-MH-Y:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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