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Renesas AT45DB161D-CU
- Part No.:
- AT45DB161D-CU
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 24-LBGA, CSPBGA
- Datasheet:
-
AT45DB161D-CU.pdf
- Description:
- IC FLASH 16MBIT SPI 66MHZ 24CBGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,302
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Product details
Overview
AT45DB161D-CU from Adesto Technologies (now part of Dialog Semiconductor) is a 16-Mbit serial DataFlash memory IC with RapidS™ SPI-compatible interface, supporting up to 66 MHz clock frequency, 512- or 528-byte configurable page size, and dual 512/528-byte SRAM buffers for concurrent read/write operations. It operates from a single 2.5V–3.6V or 2.7V–3.6V supply and targets embedded code shadowing, firmware storage, and data logging in industrial microcontroller systems.
For engineers reviewing the AT45DB161D-CU datasheet, AT45DB161D-CU pinout, AT45DB161D-CU application, or AT45DB161D-CU equivalent, key selection considerations include its dual-buffered sequential-access architecture, hardware/software sector protection, 100,000 program/erase cycles per page, 20-year data retention, and industrial temperature support - all critical for reliable firmware update and secure parameter storage in resource-constrained designs.
Technical Context
The AT45DB161D-CU implements a serial Flash architecture optimized for sequential access via SPI Mode 0/3, eliminating parallel address/data buses and reducing pin count to 8 active signals. Its memory is organized as 4,096 pages (512- or 528-byte each), backed by two independent SRAM buffers that enable pipelined operation: one buffer accepts new data while the other transfers to Flash during page programming.
It supports four erase granularities - page (512 B), block (4 KB), sector (128 KB), and chip (16 Mbit) - with all operations self-timed and monitored via RDY/BUSY pin. Sector lockdown and a 128-byte security register (64-byte user-programmable + 64-byte unique ID) provide hardware-enforced data integrity for boot code and calibration data.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 16 Mbit (2,097,152 bytes), organized as 4,096 × 512-byte or 528-byte pages |
| Interface Speed | Up to 66 MHz SCK for Continuous Array Read (Legacy E8H/High-Freq 0BH), enabling >6 MB/s sustained throughput |
| Supply Voltage | Single 2.5V–3.6V or 2.7V–3.6V rail - eliminates level-shifting in 2.5V/3.3V MCU systems |
| Active Read Current | 7 mA typical - enables low-power logging in battery-backed applications |
| Standby / Deep PD Current | 25 µA / 15 µA typical - supports ultra-low-power sleep modes without external power gating |
| Endurance & Retention | 100,000 program/erase cycles per page; 20-year data retention at industrial temperature range (−40°C to +85°C) |
| Security Features | 128-byte security register (64-byte user space + 64-byte unique device ID); per-sector hardware write protection and lockdown |
Pinout & Package
AT45DB161D-CU is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with standard 150-mil body width and RoHS-compliant green finish. Pin functions are electrically defined and validated per Adesto datasheet 3500O–DFLASH–11/2012.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; falling edge initiates command sequence; high-impedance SO when deasserted |
| SCK | Serial Clock | Input clock controlling data latching (SI on rising edge, SO on falling edge); supports up to 66 MHz |
| SI | Serial Input | Command, address, and data input path; MSB-first protocol; synchronous to SCK rising edge |
| SO | Serial Output | Data output path for reads; tri-stated when CS is high; synchronized to SCK falling edge |
| WP | Write Protect | Hardware-level sector lock override; low = blocks program/erase regardless of software protection state |
| RESET | Reset Input | Active-low hard reset; terminates ongoing operation and returns state machine to idle; internal POR circuit included |
| RDY/BUSY | Ready/Busy Indicator | Open-drain output pulled high externally; driven low during self-timed operations (program/erase/buffer transfer) |
| VCC / GND | Power Supply | Single 2.5–3.6V supply and ground; no high-voltage programming required |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM Buffers (512/528 B each) | Enables simultaneous host-to-buffer streaming and buffer-to-Flash programming - eliminates write latency stalls in real-time logging |
| Configurable Page Size (512 or 528 B) | Factory-set 512-byte "power-of-two" mode simplifies address arithmetic in MCU firmware; 528-byte mode supports ECC metadata storage |
| Continuous Array Read (E8H/0BH/03H) | Auto-incrementing internal counter allows uninterrupted code shadowing across page boundaries - no CPU intervention needed |
| Flexible Erase Granularity | Page/block/sector/chip erase options let designers optimize update speed vs. wear leveling - e.g., sector erase for OTA firmware patches |
| Hardware Sector Lockdown | Immutable locking of protected sectors prevents accidental overwrite of bootloader or calibration data - survives power loss and reset |
| JEDEC ID & Unique Device ID | Standard manufacturer/device ID (0x1F 0x45) plus 64-byte factory-programmed unique serial number - enables secure device authentication |
Applications
| Firmware Storage | Code Shadowing |
|---|---|
|
Use Scenario: Storing bootloaders, application binaries, and configuration images in MCU-based industrial controllers where field updates must be atomic and recoverable. IC Role / Device Role / Timing Role: Nonvolatile firmware repository accessed via SPI during boot or OTA update; RDY/BUSY pin synchronizes host polling. Use Value: Sector lockdown prevents corruption of critical bootloader; 100K-cycle endurance ensures >10 years of daily firmware updates at 3 updates/day. |
Use Scenario: Executing application code directly from Flash by copying to RAM - common in Cortex-M0/M3 systems with limited internal Flash. IC Role / Device Role / Timing Role: High-speed sequential memory source; Continuous Array Read (0BH) delivers >6 MB/s to match CPU fetch bandwidth. Use Value: No page-boundary delays during wraparound reads; eliminates software address management overhead in shadow copy routines. |
| Data Logging | Secure Parameter Storage |
|
Use Scenario: Recording sensor readings, event timestamps, and diagnostic logs in battery-powered environmental monitors operating for years unattended. IC Role / Device Role / Timing Role: Low-power persistent storage; dual buffers allow background logging while host processes prior data. Use Value: 15 µA deep power-down current extends battery life; page-erase granularity minimizes write amplification in circular buffer use. |
Use Scenario: Storing cryptographic keys, calibration coefficients, and device-specific credentials in medical or automotive ECUs requiring tamper resistance. IC Role / Device Role / Timing Role: Secure nonvolatile register bank; 128-byte security register with unique 64-byte ID enables device binding. Use Value: Hardware WP pin + sector lockdown provides physical-layer protection against unauthorized reprogramming - independent of MCU firmware state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT45DB161E-CU | Direct successor; identical pinout, voltage, and timing; adds enhanced ECC and improved deep power-down stability | Same use cases but qualified for new designs; replaces AT45DB161D-CU where long-term supply assurance is required | Select AT45DB161E-CU for new designs - AT45DB161D-CU is Not Recommended for New Designs per Adesto documentation |
| W25Q16JVSSIQ | 16 Mbit Quad SPI NOR Flash; 133 MHz QSPI clock; no SRAM buffers; standard 256-byte pages; no built-in sector lockdown | Better raw speed for random reads; lacks dual-buffer concurrency and hardware security features - requires MCU-side ECC and protection logic | Choose W25Q16JVSSIQ only if QSPI interface and higher random-access performance outweigh need for seamless streaming and embedded security |
Compared with AT45DB161D-CU, AT45DB161E-CU offers assured longevity and minor reliability enhancements without design changes, while W25Q16JVSSIQ trades off buffering and security for higher bandwidth and broader ecosystem support - making it suitable only when those trade-offs align with system architecture constraints.
Availability
AT45DB161D-CU is available at Aetrix Electronics and suitable for firmware storage, code shadowing, data logging, and secure parameter storage requiring stable component supply across industrial, medical, and embedded control applications.
Supply support for AT45DB161D-CU 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, acquired by Dialog Semiconductor in 2020, specialized in low-power, high-reliability nonvolatile memory and IoT connectivity solutions for industrial and embedded markets.
The AT45DB161D-CU belongs to the DataFlash® family - designed specifically for sequential-access applications where SPI simplicity, dual-buffer concurrency, and hardware security outperform traditional NOR/NAND Flash in MCU-centric systems.
FAQ
What is the maximum clock frequency supported by AT45DB161D-CU for continuous read operations?
The AT45DB161D-CU supports up to 66 MHz for Continuous Array Read using opcodes E8H (legacy) or 0BH (high-frequency mode), delivering sustained throughput exceeding 6 MB/s. This is validated under VCC = 2.7–3.6 V and industrial temperature conditions per datasheet specification fCAR1. The 03H low-frequency mode supports up to 33 MHz without dummy byte overhead.
Does AT45DB161D-CU require high-voltage programming or external charge pumps?
No, AT45DB161D-CU operates entirely from its single 2.5V–3.6V or 2.7V–3.6V supply rail for all read, program, and erase operations. It contains no internal charge pump and does not require external high-voltage generators - simplifying power design and PCB layout compared to legacy Flash devices.
How does the dual-buffer architecture of AT45DB161D-CU improve system performance?
The AT45DB161D-CU's two independent 512/528-byte SRAM buffers allow overlapping operations: while one buffer streams incoming data from the host via SI, the other concurrently programs into Flash memory. This pipelining eliminates wait states during page programming, enabling true continuous data logging and real-time firmware updates without CPU stalling.
Can AT45DB161D-CU be used for EEPROM emulation, and how is it implemented?
Yes, AT45DB161D-CU supports robust EEPROM emulation via a self-contained three-step read-modify-write process managed in firmware. Its page-erase granularity, 100,000-cycle endurance, and dual-buffer architecture allow efficient bit/byte-level updates - for example, storing and modifying individual configuration parameters without erasing full sectors or compromising data integrity.
Is AT45DB161D-CU pin-compatible with AT45DB161E-CU, and what are the implications for migration?
Yes, AT45DB161D-CU and AT45DB161E-CU share identical 8-pin SOIC packaging, pinout, electrical specifications, and command set. Migration requires only a bill-of-materials change - no PCB or firmware modifications - and is strongly recommended since AT45DB161D-CU is marked "Not Recommended for New Designs" in official Adesto documentation.
AT45DB161D-CU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 24-LBGA, CSPBGA
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 16Mbit
- Memory Organization:
- 528 Bytes x 4096 pages
- Memory Interface:
- SPI
- Clock Frequency:
- 66 MHz
- Write Cycle Time - Word, Page:
- 6ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-CBGA (6x8)
AT45DB161D-CU FAQ
1.How can I place an order for AT45DB161D-CU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB161D-CU 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 AT45DB161D-CU reliable?
The price and inventory of AT45DB161D-CU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB161D-CU is usually 5 days.
3.What payment methods are accepted for AT45DB161D-CU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB161D-CU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB161D-CU?
AT45DB161D-CU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB161D-CU 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 AT45DB161D-CU?
For technical support, including AT45DB161D-CU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB161D-CU requirements.
6.How does Aetrix verify that AT45DB161D-CU is sourced from the original manufacturer or authorized distributors?
All AT45DB161D-CU 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 AT45DB161D-CU meets industry standards.
7.What is the process for return or replacement of AT45DB161D-CU?
All AT45DB161D-CU units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB161D-CU, 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 AT45DB161D-CU part is unused and in its original packaging.
Return procedure for AT45DB161D-CU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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