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Microchip Technology AT45DB161D-CU
- Part No.:
- AT45DB161D-CU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 24-LBGA, CSPBGA
- Datasheet:
-
AT45DB161D-CU.pdf
- Description:
- IC FLASH 16MBIT SPI 66MHZ 24CBGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,738
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Product details
Overview
AT45DB161D-CU from Microchip Technology (formerly Atmel) is a 16-Mbit serial DataFlash memory IC with SPI-compatible RapidS interface, organized as 4,096 pages of 512- or 528-byte capacity, dual 512-/528-byte SRAM buffers, and industrial-grade operation from 2.5V–3.6V supply. It enables high-speed code shadowing, firmware storage, and EEPROM emulation in embedded microcontroller systems.
For engineers reviewing the AT45DB161D-CU datasheet, AT45DB161D-CU pinout, AT45DB161D-CU application, or AT45DB161D-CU equivalent, key selection criteria include its 66MHz max clock frequency, flexible page/sector/block erase granularity, hardware/software write protection, and continuous read capability across full memory array without address reissuing.
Technical Context
The AT45DB161D-CU implements a sequential-access Flash architecture using a 3-wire SPI-compatible RapidS interface (modes 0 and 3), eliminating parallel address/data buses to reduce pin count and layout complexity. Its dual SRAM buffers support simultaneous data reception and Flash reprogramming-enabling seamless streaming writes and background page programming.
Memory organization is hierarchical: 16 sectors (0a–15), each containing up to 256 pages; pages are grouped into 8-page blocks. Erase operations are fully configurable at chip (16 Mbit), sector (128 Kbyte), block (4 Kbyte), or page (512/528 byte) level, with all program/erase cycles self-timed and requiring no external high-voltage supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 16 Mbit (2,097,152 bytes) total capacity, organized as 4,096 × 512-byte or 4,096 × 528-byte pages |
| Interface Speed | Up to 66 MHz SCK for Continuous Array Read (0BH/E8H opcodes); supports legacy (03H) and high-frequency modes |
| Supply Voltage | 2.5V–3.6V or 2.7V–3.6V single supply-no VPP required for programming or erase |
| Power Consumption | 7 mA typical active read current; 25 µA standby; 15 µA deep power-down current |
| Erase/Program Endurance | ≥100,000 program/erase cycles per page; 20-year data retention at industrial temperature range |
| Security Features | 128-byte security register (64-byte user-programmable + 64-byte unique device ID); sector lockdown and hardware WP pin |
| Operating Temperature | −40°C to +85°C industrial grade |
Pinout & Package
AT45DB161D-CU is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with standard lead pitch and RoHS-compliant green finish. Pin functions are electrically defined and validated per Atmel/Microchip datasheet 3500N–DFLASH–05/10.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; falling edge initiates command sequence; rising edge terminates operation and triggers self-timed execution |
| SCK | Serial Clock | Input clock controlling data transfer timing; SI latched on rising edge, SO driven on falling edge |
| SI | Serial Input | Command, address, and data input line; MSB-first protocol; used for all instruction and payload loading |
| SO | Serial Output | Open-drain output for read data and status; requires external pull-up; tri-stated when CS is high |
| WP | Write Protect | Hardware-level sector protection override; low state disables all program/erase commands to protected sectors regardless of software settings |
| RESET | Reset | Active-low asynchronous reset; terminates ongoing operation and returns internal state machine to idle |
| RDY/BUSY | Ready/Busy Indicator | Open-drain output pulled high externally; driven low during self-timed operations (program/erase/buffer transfers) |
| VCC / GND | Power Supply | Single 2.5–3.6V supply and ground reference; no separate I/O voltage required |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM Buffers | Two independent 512-/528-byte buffers enable concurrent data reception while main memory is being reprogrammed-critical for uninterrupted firmware updates |
| Continuous Array Read | Single-start, wrap-around sequential read across entire 16-Mbit array at up to 66 MHz-eliminates address reissuing and enables efficient code shadowing |
| Flexible Erase Granularity | Page (512/528 B), block (4 KB), sector (128 KB), or chip (16 Mb) erase options allow precise wear leveling and partial firmware updates without full chip erasure |
| EEPROM Emulation Support | Self-contained three-step read-modify-write operation enables bit- or byte-alterable storage behavior-replacing true EEPROM in cost-sensitive designs |
| Hardware + Software Protection | Combines dedicated WP pin (hardware lock) with programmable Sector Protection Register and Sector Lockdown-prevents unauthorized firmware modification in field-deployed devices |
Applications
| Firmware Storage | Code Shadowing |
|---|---|
Use Scenario: Storing bootloaders, application firmware, and configuration data in microcontroller-based IoT edge nodes with infrequent updates but strict integrity requirements. IC Role / Device Role / Timing Role: Nonvolatile serial Flash memory providing reliable, low-pin-count storage for MCU code and parameters via SPI interface. Use Value: Enables secure, sector-locked firmware storage with 100K-cycle endurance and 20-year retention-reducing need for external EEPROM or costly parallel Flash. |
Use Scenario: Loading executable code from Flash into RAM for execution in resource-constrained MCUs (e.g., ARM Cortex-M0+), minimizing boot time and flash access latency. IC Role / Device Role / Timing Role: High-speed sequential-access memory supporting continuous read mode at 66 MHz to stream instructions directly to CPU cache or instruction bus. Use Value: Eliminates address overhead and page-boundary delays during code fetch-improving effective throughput by >3× vs. standard SPI Flash in shadowing applications. |
| Data Logging | Secure Configuration Storage |
Use Scenario: Capturing sensor readings, event logs, or diagnostic traces in industrial controllers where data must survive power loss and support frequent small writes. IC Role / Device Role / Timing Role: Serial Flash with dual buffers and page-program flexibility acting as a wear-leveled, high-reliability logging buffer. Use Value: Buffer-to-page programming allows background buffering of incoming data while previous page erases-enabling deterministic 5–10 ms write latency even under continuous logging. |
Use Scenario: Storing calibrated sensor offsets, cryptographic keys, or device-specific credentials in medical or automotive ECUs requiring tamper resistance. IC Role / Device Role / Timing Role: Secure nonvolatile memory with 128-byte security register, unique 64-byte device ID, and sector lockdown capability. Use Value: Prevents unauthorized readout or modification of sensitive data through hardware WP pin + software sector locking-meeting basic functional safety and anti-cloning 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 W25Q16JVSSIQ | 16 Mbit Quad SPI NOR Flash; 133 MHz max clock; no built-in SRAM buffers; no continuous read wrap-around | Requires external buffering logic for streaming; better suited for XIP (execute-in-place) than shadowing | Choose for higher clock speed and QSPI compatibility where dual-buffer streaming is not required |
| Macronix MX25L1606EM2I-12G | 16 Mbit standard SPI NOR Flash; 80 MHz max clock; no SRAM buffers; supports standard SPI only (no RapidS) | Lacks continuous read optimization and intelligent page programming; simpler command set | Choose for cost-sensitive designs needing basic SPI Flash functionality without advanced streaming or emulation features |
Compared with W25Q16JVSSIQ and MX25L1606EM2I-12G, the AT45DB161D-CU uniquely delivers dual-buffered streaming writes, automatic wrap-around continuous reads, and integrated EEPROM emulation-making it optimal for real-time firmware update and code shadowing where deterministic latency and minimal host intervention are critical.
Availability
AT45DB161D-CU is available at Aetrix Electronics and suitable for firmware storage, code shadowing, data logging, and secure configuration storage requiring stable component supply, long-term lifecycle support, and industrial temperature compliance.
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
Microchip Technology acquired Atmel in 2016 and continues to manufacture and support the DataFlash product family, known for low-pin-count serial Flash solutions targeting embedded systems.
The AT45DB161D-CU belongs to the DataFlash series-designed specifically for applications demanding high-speed sequential access, reduced PCB footprint, and simplified firmware update mechanisms in space- and power-constrained environments.
FAQ
What is the maximum clock frequency supported by the AT45DB161D-CU for continuous read operations?
The AT45DB161D-CU supports up to 66 MHz for Continuous Array Read using opcodes 0BH (high-frequency mode) or E8H (legacy mode), as specified in the fCAR1 parameter. This enables high-throughput code shadowing without address reissuing. The AT45DB161D-CU achieves this performance while maintaining full compatibility with standard SPI mode 0 and mode 3 timing conventions.
Does the AT45DB161D-CU require a high-voltage programming supply?
No, the AT45DB161D-CU operates entirely from a single 2.5V–3.6V or 2.7V–3.6V supply for all operations-including program, erase, and read-eliminating the need for external VPP circuitry. All internal programming and erase cycles are self-timed, and the AT45DB161D-CU automatically manages voltage boosting internally.
How does the dual-buffer architecture of the AT45DB161D-CU improve system-level data throughput?
The AT45DB161D-CU's two independent 512-/528-byte SRAM buffers allow simultaneous data reception on one buffer while the other buffer is being written to Flash memory-enabling uninterrupted streaming of firmware or log data. This eliminates host wait states and reduces effective write latency, making the AT45DB161D-CU especially valuable in real-time embedded applications.
Can the AT45DB161D-CU emulate EEPROM functionality for byte-level updates?
Yes, the AT45DB161D-CU supports EEPROM emulation via a self-contained three-step read-modify-write operation, allowing bit- or byte-alterable storage behavior without external hardware. This capability is implemented in firmware using the AT45DB161D-CU's page-program and buffer-manipulation commands, enabling replacement of true EEPROM in cost-sensitive designs.
What package options are available for the AT45DB161D-CU, and is the SOIC variant RoHS-compliant?
The AT45DB161D-CU is offered in multiple packages including 8-pin SOIC (AT45DB161D-CU), TSOP, BGA, and MLF. The SOIC variant (CU suffix) is RoHS-compliant, halide-free, and lead-free per JEDEC standards. All variants meet industrial temperature range (−40°C to +85°C) and green packaging requirements as documented in the official Microchip datasheet.
AT45DB161D-CU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- 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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