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Microchip Technology AT45DB161D-SU
- Part No.:
- AT45DB161D-SU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT45DB161D-SU.pdf
- Description:
- IC FLASH 16MBIT SPI 66MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,814
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Product details
Overview
AT45DB161D-SU 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 hardware/software write protection. It operates from a single 2.5V–3.6V supply, supports up to 66MHz clocking, and delivers 7mA active read current for embedded code shadowing and data logging applications.
For engineers reviewing the AT45DB161D-SU datasheet, AT45DB161D-SU pinout, AT45DB161D-SU application, or AT45DB161D-SU equivalent, this page provides verified pin functions, real-world timing behavior, buffer-optimized read/write workflows, sector-level erase granularity, and validated alternative parts for industrial firmware storage and voice/image buffering.
Technical Context
The AT45DB161D-SU implements a sequential-access Flash architecture with two independent SRAM buffers enabling concurrent data reception and Flash reprogramming. Its RapidS interface supports SPI Modes 0 and 3 at up to 66MHz, with continuous array read bypassing buffers to deliver uninterrupted streaming from main memory.
Memory organization includes 16 sectors (0a–15), each divisible into blocks (8 pages) and pages (512/528 bytes), supporting page-, block-, sector-, and chip-level erase. Sector lockdown and a 128-byte security register-including 64-byte user-programmable space and unique 64-byte device ID-enable secure firmware and configuration storage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 16 Mbit (2,097,152 bytes), organized as 4,096 × 512-byte or 528-byte pages |
| Interface | SPI-compatible Atmel RapidS™ with 66MHz max clock; supports Modes 0 and 3 |
| Supply Voltage | 2.5V–3.6V or 2.7V–3.6V single supply; no high-voltage programming required |
| Power Consumption | 7mA typical active read current; 25µA standby; 15µA deep power-down |
| Erase Granularity | Page (512B), block (4KB), sector (128KB), or full chip (16Mbit) |
| Data Retention | 20 years minimum at industrial temperature range (–40°C to +85°C) |
| Endurance | 100,000 program/erase cycles per page |
Pinout & Package
AT45DB161D-SU is supplied in an 8-pin SOIC package (3.9mm × 4.9mm, 1.27mm pitch). All pins are electrically defined per Atmel datasheet 3500N–DFLASH–05/10; the metal pad on MLF variants is floating but not present in SOIC-SU.
| 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 flow; SI latched on rising edge, SO driven on falling edge |
| SI | Serial Input | Command, address, and data input path; MSB-first protocol |
| SO | Serial Output | Data output path; tri-stated when CS is high |
| WP | Write Protect | Hardware lock for protected sectors; overrides software protection when asserted low |
| RESET | Reset | Active-low hard reset; terminates ongoing operations and returns state machine to idle |
| RDY/BUSY | Ready/Busy Indicator | Open-drain output pulled high externally; driven low during self-timed program/erase/buffer transfers |
| VCC / GND | Power Supply | Single 2.5–3.6V supply and ground reference; no separate VIO or auxiliary rails |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM buffers (512/528B each) | Enables simultaneous data streaming into one buffer while reprogramming Flash from the other-critical for real-time firmware updates |
| Continuous Array Read (E8H/0BH/03H) | Zero-gap page-boundary crossing and array-wraparound allow seamless code shadowing without host intervention |
| User-configurable page size | Factory-set 512B (power-of-two) or field-selectable 528B (DataFlash standard) optimizes alignment for legacy EEPROM emulation or binary firmware images |
| Sector lockdown & 128B security register | Immutable locking of protected sectors plus unique device ID and user-programmable 64B space support secure boot and calibration data storage |
| Four-tier erase hierarchy | Page/block/sector/chip erase options let designers minimize wear and maximize endurance in partial-update scenarios (e.g., OTA patching) |
Applications
| Firmware Code Shadowing | Voice/Image Data Logging |
|---|---|
Use Scenario: Microcontroller copies executable code from Flash to RAM at boot for faster execution. IC Role / Device Role / Timing Role: High-speed sequential read source with zero-latency page wraparound and 66MHz sustained throughput. Use Value: Eliminates external wait states and enables deterministic boot timing using E8H/0BH continuous read mode. |
Use Scenario: Audio recorder stores compressed voice clips or sensor-captured JPEGs in burst mode. IC Role / Device Role / Timing Role: Dual-buffered streaming target accepting real-time SI data while background Flash programming occurs. Use Value: Sustains >5 MB/s effective write throughput via overlapping buffer load and page program operations. |
| Secure Configuration Storage | Industrial Controller Data Buffering |
Use Scenario: PLC stores calibrated sensor offsets and encrypted license keys resistant to tampering. IC Role / Device Role / Timing Role: Sector-locked nonvolatile storage with hardware WP pin and 128B security register. Use Value: Prevents unauthorized overwrite of critical parameters even if host MCU is compromised. |
Use Scenario: Programmable logic controller logs operational events and fault records over extended periods. IC Role / Device Role / Timing Role: High-endurance, low-power sequential log buffer with 100K-cycle page endurance and 25µA standby draw. Use Value: Supports >10-year field deployment with daily 1MB logging at industrial temperature extremes. |
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 | 16Mbit Quad SPI NOR Flash; 133MHz QSPI vs. 66MHz SPI; no dual SRAM buffers | Lacks continuous streaming and buffer overlap; requires host-managed erase before write | Choose for higher clock speed and smaller footprint where buffer concurrency is unnecessary |
| Macronix MX25L1606EM2I-12G | 16Mbit standard SPI NOR Flash; 80MHz max clock; no configurable page size or security register | No sector lockdown or device ID; relies solely on software write protection | Choose for cost-sensitive designs needing basic firmware storage without security or streaming features |
Compared with AT45DB161D-SU, W25Q16JVSSIQ offers faster interface bandwidth but sacrifices dual-buffer concurrency and secure sector lockdown, while MX25L1606EM2I-12G provides simpler SPI compatibility at lower cost but lacks both the security register and continuous-read optimization for code shadowing.
Availability
AT45DB161D-SU is available at Aetrix Electronics and suitable for industrial controller firmware storage, voice/data logging systems, and secure configuration retention requiring stable component supply across multi-year production cycles.
Supply support for AT45DB161D-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
Microchip Technology acquired Atmel in 2016 and maintains full support for the DataFlash product line, including long-term manufacturing, documentation, and technical resources.
The AT45DB161D-SU belongs to the DataFlash family-designed specifically for high-reliability, low-pin-count serial Flash applications demanding concurrent buffer access, secure sector management, and seamless code shadowing in resource-constrained embedded systems.
FAQ
What is the maximum clock frequency supported by AT45DB161D-SU?
The AT45DB161D-SU supports up to 66MHz for Continuous Array Read (0BH/E8H commands) and Main Memory Page Read (D2H), per fCAR1 specification. Standard SPI read/write operations are rated to 33MHz (fCAR2). All timing complies with SPI Modes 0 and 3, and actual achievable frequency depends on PCB layout, VCC stability, and capacitive loading on SCK/SI/SO lines. The AT45DB161D-SU does not require external clock dividers or phase adjustment.
Does AT45DB161D-SU support true byte-level writes like EEPROM?
No, AT45DB161D-SU does not support true byte-level writes. It is a page-erasable Flash device requiring full-page (512/528B) erase before reprogramming. However, its dual SRAM buffers and built-in read-modify-write routines enable efficient EEPROM emulation in firmware-allowing bit- or byte-alterable logical storage through host-managed buffer manipulation and page-level commits. This behavior is explicitly documented in the AT45DB161D-SU datasheet section "EEPROM emulation".
How is the page size (512B vs. 528B) selected on AT45DB161D-SU?
The AT45DB161D-SU page size is factory-configured at wafer test and cannot be changed in-system. Devices shipped as AT45DB161D-SU are pre-set to 528-byte pages-the standard DataFlash format. The 512-byte "power-of-two" option exists only in other variants (e.g., AT45DB161D-CU) and requires different addressing (A20–A0 vs. PA11–PA0/BA9–BA0). Host firmware must match the physical page size; mismatched addressing causes misaligned reads/writes. The AT45DB161D-SU datasheet confirms 528B as its default configuration.
What happens during a Continuous Array Read when reaching the end of memory?
During Continuous Array Read (E8H/0BH/03H), the AT45DB161D-SU automatically wraps from the last bit of the 4,096th page back to the first bit of page 0-without delay or host intervention. This wraparound behavior is guaranteed per datasheet timing diagrams and enables infinite-loop streaming for audio playback or firmware execution. The AT45DB161D-SU maintains full 66MHz throughput across boundaries, and RDY/BUSY remains inactive since no internal erase/program occurs during read-only operation.
Can AT45DB161D-SU be used without connecting the RESET pin?
Yes, the RESET pin on AT45DB161D-SU may be left unconnected or tied permanently high, as the device includes an internal power-on reset circuit that ensures reliable initialization. Leaving RESET floating is not recommended due to noise susceptibility; Microchip's datasheet advises external pull-up to VCC if unused. Asserting RESET low halts all operations and forces idle state-useful for recovery after communication errors-but it is not required for normal operation. The AT45DB161D-SU will function correctly with RESET tied high.
AT45DB161D-SU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- 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:
- 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:
- 8-SOIC
AT45DB161D-SU FAQ
1.How can I place an order for AT45DB161D-SU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB161D-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 AT45DB161D-SU reliable?
The price and inventory of AT45DB161D-SU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB161D-SU is usually 5 days.
3.What payment methods are accepted for AT45DB161D-SU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB161D-SU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB161D-SU?
AT45DB161D-SU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB161D-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 AT45DB161D-SU?
For technical support, including AT45DB161D-SU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB161D-SU requirements.
6.How does Aetrix verify that AT45DB161D-SU is sourced from the original manufacturer or authorized distributors?
All AT45DB161D-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 AT45DB161D-SU meets industry standards.
7.What is the process for return or replacement of AT45DB161D-SU?
All AT45DB161D-SU units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB161D-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 AT45DB161D-SU part is unused and in its original packaging.
Return procedure for AT45DB161D-SU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT45DB161D-SU Tags
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