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Microchip Technology AT45DB161B-TI-2.5
- Part No.:
- AT45DB161B-TI-2.5
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
AT45DB161B-TI-2.5.pdf
- Description:
- IC FLASH 16MBIT SPI 15MHZ 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,950
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Product details
Overview
AT45DB161B-TI-2.5 from Microchip Technology (formerly Atmel) is a 16-Mbit serial DataFlash memory IC with SPI interface, organized as 4096 pages × 528 bytes, featuring dual 528-byte SRAM buffers and hardware write protection. It operates from a single 2.5V supply, supports up to 20 MHz clock frequency, and enables continuous array read for code shadowing in embedded microcontroller systems.
For engineers reviewing the AT45DB161B-TI-2.5 datasheet, AT45DB161B-TI-2.5 pinout, AT45DB161B-TI-2.5 application, or AT45DB161B-TI-2.5 equivalent, key selection criteria include 2.5V-only operation, page/block erase flexibility, 5.0V-tolerant control inputs (CS, SCK, SI, WP, RESET), RDY/BUSY open-drain status signaling, and compatibility with SPI Mode 0/3 for host MCU integration.
Technical Context
The AT45DB161B-TI-2.5 implements a serial Flash architecture with two independent 528-byte SRAM buffers enabling concurrent data reception and nonvolatile memory reprogramming. Its SPI interface uses MSB-first transmission, supports both Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1), and requires no high-voltage programming - all operations are self-timed under 2.5V supply.
Memory organization includes hierarchical granularity: 4096 pages (528 B/page), grouped into 512 blocks of 8 pages (4224 B/block), and sectors of variable size (e.g., Sector 0 = 8 pages, Sectors 1–16 = 248–256 pages). Page-level erase, block-level erase, and buffer-to-main-memory program with built-in erase are all supported via discrete 8-bit opcodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 16 Mbit (17,301,504 bits), organized as 4096 × 528-byte pages |
| Supply Voltage | 2.5 V only (not 2.7–3.6 V variant); enables low-power operation in battery-sensitive designs |
| Max Clock Frequency | 20 MHz SPI clock - supports high-throughput firmware updates and streaming read |
| Active Read Current | 4 mA typical - defines power budget for active code execution or data fetch cycles |
| Standby Current | 2 µA typical CMOS standby - critical for ultra-low-power sleep modes in portable devices |
| Write Protection | Hardware WP pin protects first 256 pages (132 KB) from accidental overwrite |
| Input Tolerance | 5.0 V-tolerant on CS, SCK, SI, WP, RESET - simplifies level-shifting with 3.3 V or 5 V MCUs |
Pinout & Package
AT45DB161B-TI-2.5 is packaged in a 28-pin TSOP (Thin Small Outline Package), Type 1, with 0.55 mm pitch. Pin functions are electrically identical across TSOP, SOIC, and CBGA variants per datasheet Rev. 2224G.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; initiates instruction decode on falling edge and terminates operation on rising edge |
| SCK | Serial Clock | Input-only; controls data timing - data latched on rising edge, output shifted on falling edge |
| SI | Serial Input | Input-only; carries opcodes, addresses, and data; 5.0 V tolerant |
| SO | Serial Output | Output-only; returns read data and status register bits; tri-stated when CS high |
| WP | Write Protect | Active-low hardware lock for first 256 pages; 5.0 V tolerant; must be pulled high if unused |
| RESET | Chip Reset | Active-low asynchronous reset; terminates ongoing operation and resets internal state machine |
| RDY/BUSY | Ready/Busy Indicator | Open-drain output; pulled low during self-timed operations (erase, program, transfer, compare) |
| VCC / GND | Power Supply | 2.5 V ±10 % supply; internal power-on reset ensures safe initialization after VCC ramp |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM Buffers | Two independent 528-byte buffers allow simultaneous data loading into one buffer while reprogramming main memory from the other - enables uninterrupted data streaming |
| Continuous Array Read | Single opcode (68H/E8H) + address initiates wraparound sequential read across full 16 Mbit array - ideal for boot code shadowing without address management overhead |
| Page-Level Erase & Program | Individual 528-byte page erase (81H) and program (83H/86H) eliminate need for sector-wide erasure - preserves adjacent data integrity during partial updates |
| Buffer-to-Memory Compare | Status register bit 6 reports match/mismatch after Main Memory Page to Buffer Compare (60H/61H) - enables verified firmware patching and secure update validation |
| Auto Page Rewrite | 58H/59H command performs atomic read-modify-write on a page - essential for EEPROM-emulation of byte-alterable configuration storage |
Applications
| Industrial HMI Firmware Storage | Medical Device Configuration Log |
|---|---|
Use Scenario: Storing and updating graphical UI assets and localized language strings in touch-based industrial HMIs with limited PCB space. IC Role / Device Role / Timing Role: Nonvolatile serial Flash memory providing SPI-accessible code/data storage; RDY/BUSY pin synchronizes host MCU firmware update sequences. Use Value: Dual-buffer architecture allows background download of new UI assets into Buffer 2 while current UI runs from main memory - zero-downtime field upgrades. | Use Scenario: Logging calibration parameters, sensor offsets, and usage history in Class II medical diagnostic equipment requiring traceable, tamper-resistant storage. IC Role / Device Role / Timing Role: Secure configuration memory with hardware write protection (WP pin) and page-level erase - prevents accidental overwrites of critical calibration data. Use Value: Auto Page Rewrite (58H/59H) enables reliable byte-level updates to individual calibration records without erasing unrelated log entries - meets IEC 62304 data integrity requirements. |
| Automotive Telematics Bootloader | IoT Edge Node OTA Storage |
Use Scenario: Hosting bootloader and secure boot keys in automotive telematics units where AEC-Q100 qualification and 2.5 V operation align with vehicle ECU power domains. IC Role / Device Role / Timing Role: SPI Flash memory supporting continuous array read (68H) for fast XIP-like execution of bootloader code from external memory. Use Value: 20 MHz max clock and 4 mA active current enable rapid bootloader verification and signature checking - reduces cold-start latency below 100 ms. | Use Scenario: Storing encrypted firmware images and delta patches in battery-powered IoT edge nodes with constrained energy budgets. IC Role / Device Role / Timing Role: Low-power serial Flash with 2 µA standby current and 5.0 V-tolerant inputs - interfaces directly with 3.3 V host MCU and 5 V charging circuitry without level shifters. Use Value: Block erase (50H) accelerates OTA firmware installation by clearing 8-page (4.2 KB) chunks - cuts update time by >60 % vs. page-by-page erase in resource-limited nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT45DB161D-TI-2.5 | Successor revision with enhanced reliability; identical pinout, timing, and command set; supports same 2.5 V supply and 20 MHz clock | No functional change for existing designs; qualified for extended temperature range (−40°C to +85°C) and improved data retention | Select AT45DB161D-TI-2.5 for new designs requiring longer product lifecycle support and higher industrial-grade robustness |
| W25Q16JVSSIQ | 16 Mbit Quad SPI Flash; 3.3 V supply only; supports QPI/DTR modes; no SRAM buffers or continuous array read mode | Lacks dual-buffer concurrency and hardware WP; requires different driver stack due to command set divergence (JEDEC JESD216) | Choose W25Q16JVSSIQ only when migrating to quad-I/O for bandwidth-critical applications and accepting software redesign effort |
Compared with AT45DB161D-TI-2.5, the AT45DB161B-TI-2.5 lacks extended temperature qualification but remains fully compatible for commercial-grade designs; versus W25Q16JVSSIQ, it offers unique buffer-assisted streaming and 2.5 V operation at the cost of lower peak throughput and absence of quad-mode support.
Availability
AT45DB161B-TI-2.5 is available at Aetrix Electronics and suitable for industrial HMI firmware storage, medical device configuration logging, and automotive telematics bootloader applications requiring stable component supply and long-term obsolescence management.
Supply support for AT45DB161B-TI-2.5 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 legacy DataFlash product line, including documentation, errata, and long-term supply commitments.
The AT45DB161B-TI-2.5 belongs to the DataFlash family - designed specifically for embedded systems needing SPI-based nonvolatile storage with integrated SRAM buffers to enable concurrent data flow and memory reprogramming without CPU intervention.
FAQ
What voltage supply does the AT45DB161B-TI-2.5 require?
The AT45DB161B-TI-2.5 is a 2.5 V-only device, operating within 2.5 V ±10 % (2.25 V to 2.75 V). It is not compatible with the 2.7–3.6 V supply range used by other AT45DB161 variants. This strict 2.5 V requirement ensures optimized power efficiency and signal integrity in low-voltage embedded systems, and the AT45DB161B-TI-2.5 must be powered exclusively from a regulated 2.5 V rail.
Does the AT45DB161B-TI-2.5 support continuous read across page boundaries?
Yes, the AT45DB161B-TI-2.5 supports Continuous Array Read (opcode 68H or E8H), which automatically increments its internal address counter across page boundaries with no delay or host intervention. When the end of a 528-byte page is reached, the AT45DB161B-TI-2.5 seamlessly continues reading from the first byte of the next page - a key enabler for code shadowing and streaming audio/video playback.
How does the RDY/BUSY pin function on the AT45DB161B-TI-2.5?
The RDY/BUSY pin on the AT45DB161B-TI-2.5 is an open-drain output that pulls low during any self-timed operation - including page/block erase, buffer-to-memory program, page transfer, and compare. It remains high otherwise. The AT45DB161B-TI-2.5 requires an external 1 kΩ pull-up resistor; polling this pin avoids software delays and enables precise synchronization of host MCU operations with flash internal timing.
Can the AT45DB161B-TI-2.5 emulate EEPROM functionality?
Yes, the AT45DB161B-TI-2.5 supports EEPROM emulation via its Auto Page Rewrite (58H/59H) command, which performs an atomic read-modify-write cycle on a single 528-byte page. This allows reliable byte- or word-level updates without erasing unrelated data. The AT45DB161B-TI-2.5 leverages its dual buffers to hold modified data while preserving original content - making it suitable for storing infrequently changed configuration registers or calibration values.
What is the purpose of the WP pin on the AT45DB161B-TI-2.5?
The WP (Write Protect) pin on the AT45DB161B-TI-2.5 is a hardware-level safeguard that, when held low, permanently locks the first 256 pages (132 KB) of main memory against program and erase commands. This protects critical boot code or factory calibration data from accidental corruption. If unused, the AT45DB161B-TI-2.5 requires WP to be externally pulled high to enable full memory access.
AT45DB161B-TI-2.5 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:
- 15 MHz
- Write Cycle Time - Word, Page:
- 14ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSOP
AT45DB161B-TI-2.5 FAQ
1.How can I place an order for AT45DB161B-TI-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB161B-TI-2.5 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 AT45DB161B-TI-2.5 reliable?
The price and inventory of AT45DB161B-TI-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB161B-TI-2.5 is usually 5 days.
3.What payment methods are accepted for AT45DB161B-TI-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB161B-TI-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB161B-TI-2.5?
AT45DB161B-TI-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB161B-TI-2.5 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 AT45DB161B-TI-2.5?
For technical support, including AT45DB161B-TI-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB161B-TI-2.5 requirements.
6.How does Aetrix verify that AT45DB161B-TI-2.5 is sourced from the original manufacturer or authorized distributors?
All AT45DB161B-TI-2.5 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 AT45DB161B-TI-2.5 meets industry standards.
7.What is the process for return or replacement of AT45DB161B-TI-2.5?
All AT45DB161B-TI-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB161B-TI-2.5, 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 AT45DB161B-TI-2.5 part is unused and in its original packaging.
Return procedure for AT45DB161B-TI-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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