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Renesas AT45DB081D-SU
- Part No.:
- AT45DB081D-SU
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT45DB081D-SU.pdf
- Description:
- IC FLASH 8MBIT SPI 66MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,574
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Product details
Overview
AT45DB081D-SU from Adesto Technologies is an 8-Mbit serial DataFlash memory IC with RapidS™ SPI-compatible interface (up to 66 MHz), dual 256/264-byte SRAM buffers, and flexible page/block/sector/chip erase architecture. It operates from a single 2.5V–3.6V supply, supports continuous array read for code shadowing, and delivers 7 mA active read current with 25 µA standby.
For engineers reviewing the AT45DB081D-SU datasheet, AT45DB081D-SU pinout, AT45DB081D-SU application, or AT45DB081D-SU equivalent, key selection considerations include page-size configurability (256 vs. 264 bytes), hardware write protection via WP pin, sector lockdown security, and industrial temperature operation (−40°C to +85°C).
Technical Context
The AT45DB081D-SU implements a sequential-access Flash architecture optimized for low-pin-count systems, using a three-wire SPI interface (CS, SCK, SI/SO) instead of parallel addressing. Its memory is organized as 4,096 pages × 256/264 bytes, with two independent SRAM buffers enabling concurrent data reception and Flash reprogramming.
It supports three SPI modes (0 and 3), self-timed program/erase operations, and multiple erase granularities - page (256 B), block (2 KB), sector (64 KB), and chip (8 Mbit). The device integrates a 128-byte security register (64-byte user-programmable + 64-byte unique ID) and hardware/software sector protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 8,650,752 bits (8 Mbit), organized as 4,096 pages × 256 or 264 bytes |
| Interface Speed | Up to 66 MHz RapidS™ SPI (Modes 0 and 3), enabling high-throughput streaming reads |
| Supply Voltage | 2.5V–3.6V or 2.7V–3.6V single supply - eliminates need for charge pumps or dual rails |
| Power Consumption | 7 mA typical active read current; 25 µA standby; 15 µA deep power-down - suitable for battery-backed systems |
| Erase Endurance | ≥100,000 program/erase cycles per page - validated for long-term firmware update logging |
| Data Retention | 20 years at 85°C - meets industrial embedded system lifecycle requirements |
| Operating Temperature | −40°C to +85°C industrial grade - supports deployment in harsh environments |
Pinout & Package
AT45DB081D-SU is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) surface-mount package with standard 150-mil body width and 1.27 mm pitch. Pin 1 is marked by a notch or dot; the metal pad on MLF variants is floating or GND-connected, but SOIC variant has no exposed pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable: initiates command sequence on high-to-low transition; deassertion places SO in high-Z and enters standby mode |
| SCK | Serial Clock | Input clock controlling data timing: SI latched on rising edge; SO output on falling edge |
| SI | Serial Input | Command, address, and data input path - all transfers MSB-first |
| SO | Serial Output | Data output path for reads; tri-stated when CS is high |
| WP | Write Protect | Hardware lock: low state blocks program/erase on protected sectors regardless of software settings |
| RESET | Reset | Active-low asynchronous reset: terminates ongoing operation and returns state machine to idle |
| VCC | Power Supply | Single 2.5V–3.6V supply rail - powers logic and Flash array without external regulators |
| GND | Ground | Reference return path for VCC and I/O signals - must be low-impedance connection |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM Buffers | Two independent 256-/264-byte buffers enable simultaneous data reception and Flash reprogramming - critical for real-time firmware updates |
| Continuous Array Read | Seamless wrap-around read across page and array boundaries at up to 66 MHz - eliminates CPU polling and enables direct XIP-like execution |
| User-Configurable Page Size | Factory-set 256-byte (power-of-2) or field-selectable 264-byte (DataFlash standard) - balances compatibility with legacy systems and ECC overhead handling |
| Sector Lockdown Security | Immutable locking of individual sectors after programming - prevents accidental or malicious overwrite of boot code or calibration data |
| Hardware Write Protection | WP pin provides fail-safe, non-volatile protection independent of software state - essential for safety-critical storage |
Applications
| Firmware Storage | Industrial Data Logging |
|---|---|
Use Scenario: Storing boot code, FPGA configuration bitstreams, or microcontroller firmware images in resource-constrained embedded systems. IC Role / Device Role / Timing Role: Nonvolatile program storage with fast sequential read capability and hardware write protection to prevent corruption during power loss. Use Value: Continuous Array Read at 66 MHz enables efficient code shadowing into RAM, reducing boot time and eliminating need for external parallel Flash. | Use Scenario: Capturing sensor readings, event timestamps, or diagnostic logs in PLCs, motor drives, or environmental monitors. IC Role / Device Role / Timing Role: High-endurance, low-power data buffer with sector lockdown to preserve critical calibration or fault history. Use Value: 100,000 program/erase cycles per page and 20-year data retention ensure reliable long-term operation in unattended deployments. |
| Secure Configuration Storage | Audio/Visual Content Buffering |
Use Scenario: Storing encrypted keys, device identifiers, or access credentials in medical devices or payment terminals. IC Role / Device Role / Timing Role: Secure nonvolatile storage leveraging 128-byte security register with 64-byte unique device ID and 64-byte user space. Use Value: Sector lockdown and hardware WP provide tamper-resistant storage that survives firmware resets and unauthorized access attempts. | Use Scenario: Streaming voice prompts, UI graphics, or audio samples in consumer electronics or automotive infotainment systems. IC Role / Device Role / Timing Role: High-speed serial Flash acting as off-chip memory for burst-mode playback with minimal host controller overhead. Use Value: Dual SRAM buffers allow uninterrupted data streaming while background Flash writes occur - eliminating audio glitches or frame drops. |
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 W25Q80DVSSIG | 8 Mbit Quad SPI (QSPI) interface; 104 MHz max clock; no SRAM buffers; standard 256-byte pages only | Lacks dual-buffer concurrency and continuous array read - requires host-managed buffering for streaming | Choose for QSPI-capable hosts needing higher bandwidth and smaller footprint; avoid if buffer-assisted reprogramming is required |
| Macronix MX25L8006EM1I-12G | 8 Mbit standard SPI; 80 MHz max clock; no configurable page size; no security register or sector lockdown | No hardware write protection or immutable sector locking - relies solely on software-based protection schemes | Choose for cost-sensitive designs where security features are not mandated; verify external protection mechanisms for critical data |
Compared with W25Q80DVSSIG and MX25L8006EM1I-12G, the AT45DB081D-SU uniquely combines dual SRAM buffers, factory-configurable page size, and hardware-enforced sector lockdown - making it optimal for secure, real-time firmware and data storage where concurrent access and tamper resistance are design requirements.
Availability
AT45DB081D-SU is available at Aetrix Electronics and suitable for firmware storage, industrial data logging, secure configuration storage, and audio content buffering requiring stable component supply and long-term lifecycle support.
Supply support for AT45DB081D-SU 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 (now part of Dialog Semiconductor, acquired by Renesas) specialized in low-power, high-reliability serial Flash and nonvolatile memory solutions for industrial and IoT applications.
The AT45DB081D-SU belongs to the DataFlash® family, designed specifically for systems needing sequential-access Flash with integrated SRAM buffers, rapid streaming read, and robust security features - targeting embedded control, instrumentation, and safety-critical storage.
FAQ
What is the maximum clock frequency supported by the AT45DB081D-SU for continuous array read operations?
The AT45DB081D-SU supports continuous array read at up to 66 MHz using opcodes E8H (legacy) or 0BH (high-frequency mode), compliant with RapidS™ timing specifications. This enables high-throughput streaming without address retransmission between pages. The 03H low-frequency mode supports up to 33 MHz without dummy byte overhead. All modes maintain seamless wrap-around across page and array boundaries - a core feature of the AT45DB081D-SU architecture.
Does the AT45DB081D-SU require high-voltage programming or external circuitry for write operations?
No, the AT45DB081D-SU performs all program and erase operations using only its standard 2.5V–3.6V supply voltage - no external high-voltage generators or charge pumps are needed. Internal circuitry handles voltage boosting and timing, with all operations self-timed and reported via status register. This simplifies board design and improves reliability compared to conventional Flash devices requiring 12V programming pulses - a defining characteristic of the AT45DB081D-SU.
How does the AT45DB081D-SU handle page size configuration, and can it be changed in-system?
The AT45DB081D-SU supports both 256-byte (power-of-2) and 264-byte (DataFlash standard) page sizes. The default is factory-configured to 256 bytes, but the device allows runtime selection via specific command sequences - no hardware modification is needed. Addressing differs: 256-byte mode uses A19–A0 addressing, while 264-byte mode uses PA11–PA0 + BA8–BA0. This flexibility lets the AT45DB081D-SU interoperate with legacy systems and newer designs requiring ECC-friendly padding.
What security mechanisms does the AT45DB081D-SU provide beyond standard write protection?
Beyond the hardware WP pin, the AT45DB081D-SU includes a 128-byte security register with 64-byte unique device identifier and 64-byte user-programmable space, plus sector lockdown - a one-time irreversible lock preventing further writes to designated sectors. Sector protection registers allow fine-grained software-controlled locking. These features make the AT45DB081D-SU suitable for storing cryptographic keys, calibration data, or boot code where tamper resistance is mandatory - capabilities not found in basic SPI Flash devices.
Is the AT45DB081D-SU still recommended for new designs, and what is its industrial temperature rating?
The AT45DB081D-SU is marked "Not Recommended for New Designs" in its official datasheet (3596P–DFLASH–2/2014), indicating Adesto has superseded it with newer DataFlash generations. However, it remains fully qualified for industrial use with guaranteed operation from −40°C to +85°C, RoHS-compliant packaging, and 20-year data retention. Aetrix Electronics maintains active inventory and supply chain support for legacy integration, maintenance, and replacement needs - ensuring continued viability of the AT45DB081D-SU in deployed systems.
AT45DB081D-SU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 8Mbit
- Memory Organization:
- 264 Bytes x 4096 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
AT45DB081D-SU FAQ
1.How can I place an order for AT45DB081D-SU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB081D-SU 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 AT45DB081D-SU reliable?
The price and inventory of AT45DB081D-SU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB081D-SU is usually 5 days.
3.What payment methods are accepted for AT45DB081D-SU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB081D-SU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB081D-SU?
AT45DB081D-SU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB081D-SU 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 AT45DB081D-SU?
For technical support, including AT45DB081D-SU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB081D-SU requirements.
6.How does Aetrix verify that AT45DB081D-SU is sourced from the original manufacturer or authorized distributors?
All AT45DB081D-SU 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 AT45DB081D-SU meets industry standards.
7.What is the process for return or replacement of AT45DB081D-SU?
All AT45DB081D-SU units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB081D-SU, 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 AT45DB081D-SU part is unused and in its original packaging.
Return procedure for AT45DB081D-SU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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