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Microchip Technology AT45DB161D-TU
- Part No.:
- AT45DB161D-TU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
AT45DB161D-TU.pdf
- Description:
- IC FLASH 16MBIT SPI 66MHZ 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,467
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Product details
Overview
AT45DB161D-TU from Microchip Technology (formerly Atmel) is a 16-Mbit serial DataFlash memory IC designed for sequential-access code and data storage in embedded systems. It operates from a single 2.5V–3.6V or 2.7V–3.6V supply, supports up to 66MHz RapidS™ SPI-compatible interface (Modes 0/3), and features dual 512-/528-byte SRAM buffers enabling concurrent read-while-write operation. It is widely used in firmware boot storage and voice/image buffering applications.
For engineers reviewing the AT45DB161D-TU datasheet, AT45DB161D-TU pinout, AT45DB161D-TU application, or AT45DB161D-TU equivalent, key selection criteria include its 66MHz max clock frequency, flexible page size configuration (512/528 bytes), sector-level hardware write protection, 100,000 program/erase cycles, and industrial temperature range (–40°C to +85°C).
Technical Context
The AT45DB161D-TU implements a serial Flash architecture with two independent 512-/528-byte SRAM buffers, enabling simultaneous data reception into one buffer while reprogramming the main array from the other. Its RapidS™ interface uses standard SPI signaling (CS/SI/SO/SCK) with rising-edge input capture and falling-edge output timing.
Memory organization comprises 4,096 pages of 512 or 528 bytes each (17,301,504 bits total), partitioned into 16 sectors with hierarchical erase granularity: page (512B), block (4KB), sector (128KB), and chip (16Mbit). All erase and program operations are fully self-timed and require no external high-voltage programming signals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 16 Mbit (2,162,688 bytes), organized as 4,096 × 512/528-byte pages |
| Interface | SPI-compatible RapidS™ serial interface, Modes 0 and 3, up to 66 MHz clock |
| Supply Voltage | 2.5V–3.6V or 2.7V–3.6V single supply - enables direct integration with 2.5V/3.3V logic without level shifters |
| Active Read Current | 7 mA typical - supports low-power portable and battery-backed applications |
| Standby / Deep Power-Down | 25 µA / 15 µA typical - minimizes quiescent power during idle or sleep states |
| Endurance & Retention | 100,000 program/erase cycles per page; 20-year data retention at 85°C |
| Operating Temperature | –40°C to +85°C industrial grade - suitable for automotive control modules and industrial HMIs |
Pinout & Package
AT45DB161D-TU is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with exposed pad option, pin-compatible with industry-standard serial Flash footprints. The package supports surface-mount assembly and meets RoHS, Pb-free, and halide-free requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; initiates command sequence on falling edge and terminates on rising edge |
| 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 with no internal pull-up |
| SO | Serial Output | Open-drain output for command response and data readout; requires external pull-up resistor |
| WP | Write Protect | Hardware-level sector lock override; active-low, internally pulled high; blocks program/erase when asserted |
| RESET | Reset Input | Active-low asynchronous reset; terminates ongoing operations and returns state machine to idle |
| RDY/BUSY | Ready/Busy Indicator | Open-drain status output; driven low during self-timed program/erase/page-to-buffer transfers |
| VCC / GND | Power Supply | Single 2.5–3.6V supply rail and ground reference; decoupling capacitor required near VCC pin |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM Buffers | Two independent 512-/528-byte buffers allow continuous streaming writes while main array is being reprogrammed |
| Flexible Page Size | User-selectable 512-byte (power-of-2) or 528-byte (DataFlash-optimized) page format, factory-configurable |
| Multi-level Erase Granularity | Page (512B), block (4KB), sector (128KB), and chip (16Mbit) erase options reduce wear and improve update efficiency |
| Hardware + Software Protection | Individual sector lockdown via WP pin plus software-controlled Sector Protection Register for secure firmware storage |
| Continuous Array Read | Legacy (E8H), High-Freq (0BH), and Low-Freq (03H) read modes support seamless code shadowing without address reloads |
| Security Register | 128-byte dedicated register with 64-byte user-programmable space and unique 64-byte device ID for traceability |
Applications
| Firmware Boot Storage | Voice/Data Logging |
|---|---|
|
Use Scenario: Storing bootloader and application firmware images for microcontrollers requiring fast, reliable nonvolatile code storage. IC Role / Device Role / Timing Role: Serial Flash memory providing sequential instruction fetch capability with continuous read mode for zero-wait-state execution. Use Value: Enables direct XIP (execute-in-place) from Flash via continuous read (E8H/0BH), eliminating RAM copy overhead and reducing boot time by >40% vs. parallel Flash. |
Use Scenario: Capturing and storing audio clips, sensor logs, or diagnostic event records in portable medical devices or industrial data recorders. IC Role / Device Role / Timing Role: Buffered sequential storage device supporting real-time streaming writes using dual-SRAM-buffer overlap. Use Value: Sustains 66MHz write throughput while background erasing, allowing uninterrupted 128 kbps voice recording for >2 hours on 16 Mbit capacity. |
| Embedded GUI Resource Storage | Secure Configuration Storage |
|
Use Scenario: Holding compressed bitmap assets, fonts, and UI strings for color LCD displays in HMI panels and smart appliances. IC Role / Device Role / Timing Role: High-density serial memory serving as off-chip resource repository accessed via SPI DMA channels. Use Value: Reduces host MCU external memory footprint by 100% vs. parallel NOR Flash; SOIC-8 footprint saves >35 mm² PCB area. |
Use Scenario: Storing calibrated sensor offsets, cryptographic keys, and device-specific credentials in IoT edge nodes and payment terminals. IC Role / Device Role / Timing Role: Secure nonvolatile storage with hardware write-protection (WP pin) and sector lockdown for tamper-resistant configuration. Use Value: Prevents unauthorized firmware modification or credential extraction via physical WP assertion and 128-byte security register encryption binding. |
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 (QSPI) interface, 133 MHz max clock, no built-in SRAM buffers, no sector lockdown | Better raw throughput for burst reads; lacks concurrent read-while-write and hardware sector lock | Choose for cost-sensitive, high-speed read-heavy applications where buffer overlap is unnecessary |
| Macronix MX25L1606EM2I-12G | 16 Mbit standard SPI, 80 MHz max clock, no configurable page size, no security register or device ID | Lower gate count and BOM cost; missing security features and dual-buffer streaming capability | Choose for basic firmware storage where security, endurance, and streaming write performance are secondary |
Compared with W25Q16JVSSIQ and MX25L1606EM2I-12G, the AT45DB161D-TU uniquely delivers dual-buffer concurrency, factory-configurable page size, hardware-enforced sector lockdown, and a dedicated 128-byte security register - making it optimal for secure, real-time embedded storage where reliability and deterministic timing outweigh raw bandwidth.
Availability
AT45DB161D-TU is available at Aetrix Electronics and suitable for firmware boot storage, voice/data logging, and embedded GUI resource storage requiring stable component supply across industrial, medical, and consumer electronics programs.
Supply support for AT45DB161D-TU 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 product support, documentation, and long-term supply commitment for the AT45DB161D-TU and broader DataFlash family.
The AT45DB161D-TU belongs to Atmel's DataFlash® product line, engineered specifically for sequential-access, low-pin-count, high-reliability embedded storage - emphasizing concurrent buffer operation, flexible erase hierarchy, and integrated security for firmware and mission-critical data.
FAQ
What is the maximum operating clock frequency supported by the AT45DB161D-TU?
The AT45DB161D-TU supports a maximum serial clock (SCK) frequency of 66 MHz for Continuous Array Read (0BH/E8H) and Buffer Read commands. This applies to both 512-byte and 528-byte page configurations. The device remains fully functional at lower frequencies down to DC, and all timing parameters are guaranteed across the full industrial temperature range (–40°C to +85°C). The AT45DB161D-TU achieves this speed using Atmel RapidS™ technology while maintaining full SPI Mode 0/3 compatibility.
Does the AT45DB161D-TU support true read-while-write functionality?
Yes, the AT45DB161D-TU supports true concurrent operation via its two independent 512-/528-byte SRAM buffers. While one buffer receives incoming data over SPI, the other can be written to main memory (via Buffer-to-Page Program), or main memory can be read continuously - all without interrupting data flow. This eliminates write stalls common in standard SPI Flash, making the AT45DB161D-TU ideal for real-time streaming applications such as voice recording or firmware updates.
How does hardware write protection work on the AT45DB161D-TU?
The AT45DB161D-TU implements hardware write protection through the active-low WP (Write Protect) pin, which independently disables program and erase operations on sectors marked in the Sector Protection Register - even if software protection is disabled. When WP is asserted (low), the device ignores all program/erase commands except Enable Sector Protection and Sector Lockdown. The WP pin is internally pulled high, so it may be left unconnected if hardware protection is unused, though external tie-to-VCC is recommended for noise immunity.
Can the AT45DB161D-TU be used for EEPROM emulation?
Yes, the AT45DB161D-TU supports robust EEPROM emulation using its page-based architecture and built-in erase flexibility. By combining small-page (512-byte) configuration with page erase and buffer-managed read-modify-write sequences, users can achieve byte- or word-level alterability. The AT45DB161D-TU's 100,000 program/erase cycles per page and 20-year data retention meet or exceed typical EEPROM requirements, and its dual-buffer design simplifies atomic update implementation without external RAM buffering.
What package options are available for the AT45DB161D-TU?
The AT45DB161D-TU is offered exclusively in an 8-pin SOIC (Small Outline Integrated Circuit) package with JEDEC-standard dimensions (5.3mm × 4.4mm), designated by the "-TU" suffix. This RoHS-compliant, lead-free package features gull-wing leads and is compatible with standard reflow soldering profiles. Unlike other variants (e.g., -SU in TSOP or -MU in MLF), the -TU variant does not include an exposed thermal pad and is optimized for cost-sensitive, space-constrained PCB layouts requiring proven manufacturability.
AT45DB161D-TU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-TSSOP (0.465", 11.80mm Width)
- 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:
- 28-TSOP
AT45DB161D-TU FAQ
1.How can I place an order for AT45DB161D-TU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB161D-TU 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-TU reliable?
The price and inventory of AT45DB161D-TU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB161D-TU is usually 5 days.
3.What payment methods are accepted for AT45DB161D-TU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB161D-TU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB161D-TU?
AT45DB161D-TU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB161D-TU 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-TU?
For technical support, including AT45DB161D-TU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB161D-TU requirements.
6.How does Aetrix verify that AT45DB161D-TU is sourced from the original manufacturer or authorized distributors?
All AT45DB161D-TU 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-TU meets industry standards.
7.What is the process for return or replacement of AT45DB161D-TU?
All AT45DB161D-TU units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB161D-TU, 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-TU part is unused and in its original packaging.
Return procedure for AT45DB161D-TU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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