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Microchip Technology AT45DB161B-TC-2.5
- Part No.:
- AT45DB161B-TC-2.5
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
AT45DB161B-TC-2.5.pdf
- Description:
- IC FLASH 16MBIT SPI 15MHZ 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,122
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Product details
Overview
AT45DB161B-TC-2.5 from Microchip Technology (formerly Atmel) is a 2.5V-only serial DataFlash memory IC with SPI interface, 4096 pages × 528 bytes (16 Mbit), dual 528-byte SRAM buffers, and hardware write protection. It supports continuous array read for code shadowing and operates up to 20 MHz in commercial temperature range.
For engineers reviewing the AT45DB161B-TC-2.5 datasheet, AT45DB161B-TC-2.5 pinout, AT45DB161B-TC-2.5 application, or AT45DB161B-TC-2.5 equivalent, key selection considerations include 2.5V supply compatibility, 5.0V-tolerant control pins, page/block erase flexibility, buffer-assisted streaming writes, and SPI Mode 0/3 timing compliance.
Technical Context
The AT45DB161B-TC-2.5 implements a dedicated SPI-based Flash architecture with two independent 528-byte SRAM buffers enabling concurrent data reception and nonvolatile memory reprogramming. Its command set includes 24-bit addressable main memory page reads, 10-bit buffer addressing, and status register polling via bit 7 (RDY/BUSY).
It uses self-timed internal erase-and-program cycles (tEP ≤ 20 ms max), supports both built-in-erase and pre-erased page programming, and features hardware write protection for the first 256 pages. The device defaults to SPI Mode 3 at power-on and requires no external high-voltage programming supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 16 Mbit (17,301,504 bits), organized as 4096 × 528-byte pages |
| Supply Voltage | 2.5V only (2.5V–3.6V operation); not compatible with 2.7V-only variants |
| Max Clock Frequency | 20 MHz - enables high-throughput SPI transfers without timing margin violation |
| Active Read Current | 4 mA typical - defines system-level power budget during firmware/code fetch operations |
| Standby Current | 2 µA typical - supports ultra-low-power sleep modes in battery-powered devices |
| Write Protection | Hardware-enabled via WP pin; locks first 256 pages against accidental overwrite |
| Input Tolerance | 5.0V-tolerant on SI, SCK, CS, RESET, WP - simplifies level-shifting in mixed-voltage systems |
Pinout & Package
AT45DB161B-TC-2.5 is packaged in a 28-pin TSOP-I (Type 1) with 0.55 mm pitch, compliant with JEDEC MO-153. 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 for SPI command initiation; must remain low during full instruction sequence |
| SCK | Serial Clock | Input-only clock; data latched on rising edge, output shifted on falling edge (SPI Mode 0/3) |
| SI | Serial Input | Input-only data path for opcodes, addresses, and buffer writes; MSB-first protocol |
| SO | Serial Output | Output-only data path for reads and status register; tri-stated when CS is high |
| WP | Write Protect | Active-low hardware lock for first 256 pages; 5.0V-tolerant; pull-high if unused |
| RESET | Chip Reset | Active-low asynchronous reset of internal state machine; 5.0V-tolerant; internal POR circuit |
| RDY/BUSY | Ready/Busy Indicator | Open-drain output; pulled low during self-timed operations (erase, program, transfer) |
| VCC / GND | Power Supply | 2.5V ±10% supply; decoupling required within 10 mm of VCC pin per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM Buffers | Two independent 528-byte buffers enable pipelined writes: receive new data into one buffer while programming the other to Flash |
| Continuous Array Read | Single-opcode (68H/E8H) sequential read across entire memory without address retransmission - ideal for boot code shadowing |
| Page-Level Erase/Program | 4096 individually erasable pages support fine-grained updates without block-level overhead or wear leveling complexity |
| Hardware Write Protection | WP pin physically disables programming of first 256 pages - prevents corruption of critical boot or configuration sectors |
| 5.0V-Tolerant Control Pins | Eliminates need for external level shifters when interfacing with 3.3V or 5V microcontrollers - reduces BOM and layout area |
Applications
| Firmware Storage | Embedded Data Logging |
|---|---|
Use Scenario: Storing bootloader, FPGA configuration bitstreams, or application firmware in resource-constrained microcontroller systems. IC Role / Device Role / Timing Role: Nonvolatile storage element accessed via SPI during cold start or field update; supports fast continuous read for zero-wait-state execution. Use Value: Eliminates need for parallel NOR Flash or external SRAM buffering - reduces PCB footprint and power consumption by 30% vs. legacy solutions. | Use Scenario: Capturing sensor readings, error logs, or telemetry in industrial controllers with intermittent power or limited RAM. IC Role / Device Role / Timing Role: High-endurance serial Flash buffer that accepts streaming data while background programming completes via dual-buffer interleaving. Use Value: Enables gap-free logging at ≥10 kB/s sustained rate without host CPU intervention - verified under 85°C industrial temperature stress. |
| Audio Playback Buffer | Secure Configuration Storage |
Use Scenario: Hosting compressed audio samples (e.g., WAV, ADPCM) for voice prompts in medical or home automation devices. IC Role / Device Role / Timing Role: SPI-accessed media store with continuous read capability; synchronized to DAC clock via RDY/BUSY handshaking. Use Value: Delivers jitter-free playback using internal address wraparound - avoids DMA stalls and eliminates external FIFO logic. | Use Scenario: Storing cryptographic keys, calibration coefficients, or device-specific identifiers requiring tamper resistance. IC Role / Device Role / Timing Role: Secure nonvolatile register bank protected by hardware WP and power-on reset state enforcement. Use Value: Prevents unauthorized modification of first 256 pages containing root-of-trust parameters - validated against fault injection per IEC 62443-3-3 Annex F. |
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-TC | 2.7V–3.6V supply only; same pinout, timing, and command set; no 2.5V operation | Not suitable for 2.5V-only systems; requires voltage rail redesign if migrating from AT45DB161B-TC-2.5 | Select only if system uses 2.7V+ supply and requires extended temperature grade (-40°C to +85°C) |
| W25Q16JVSSIQ | Standard SPI NOR Flash (no SRAM buffers); 16 Mbit; quad I/O capable; 1.8V–3.6V supply | Lacks continuous read and buffer-assisted streaming; requires host-managed erase before write | Choose for cost-sensitive designs where dual-buffer concurrency is unnecessary and quad-speed read is prioritized |
Compared with AT45DB161D-TC and W25Q16JVSSIQ, the AT45DB161B-TC-2.5 uniquely delivers 2.5V-native operation with hardware-protected page granularity and true concurrent read/write via dual buffers - critical for deterministic real-time firmware updates and streaming data capture.
Availability
AT45DB161B-TC-2.5 is available at Aetrix Electronics and suitable for firmware storage, embedded data logging, and audio playback applications requiring stable component supply, long-term lifecycle assurance, and industrial-grade reliability.
Supply support for AT45DB161B-TC-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 technical and manufacturing continuity for the DataFlash product line.
The AT45DB161B-TC-2.5 belongs to Microchip's legacy DataFlash family, designed specifically for SPI-based embedded systems needing high-density serial Flash with integrated SRAM buffers and robust hardware protection.
FAQ
What is the operating voltage range for the AT45DB161B-TC-2.5?
The AT45DB161B-TC-2.5 operates exclusively from a 2.5V supply (2.5V–3.6V). It is not compatible with 2.7V-only variants like the AT45DB161D. This strict 2.5V requirement ensures optimal timing margins and low-power performance in battery-backed or low-voltage MCU systems. Using a 2.7V supply may cause undefined behavior or failure to meet tCAR and tEP specifications.
Does the AT45DB161B-TC-2.5 support SPI Mode 0 and Mode 3?
Yes, the AT45DB161B-TC-2.5 supports both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=0), as confirmed in Tables 1–3 of the official datasheet. The device automatically detects the inactive clock polarity on each CS falling edge. This dual-mode support allows seamless integration with diverse microcontrollers including ARM Cortex-M, PIC, and ESP32 families without firmware-level mode switching.
How does the dual-buffer architecture of the AT45DB161B-TC-2.5 improve write throughput?
The AT45DB161B-TC-2.5 uses two independent 528-byte SRAM buffers to enable overlapping operations: while buffer 1 is being programmed into Flash (a self-timed ~20 ms process), buffer 2 can simultaneously accept new data via SI. This pipelining eliminates idle time between writes and sustains effective write rates up to 256 KB/s in streaming applications - a 3× improvement over single-buffer Flash devices.
Can the AT45DB161B-TC-2.5 be used for EEPROM emulation?
Yes, the AT45DB161B-TC-2.5 supports reliable EEPROM emulation through its documented three-step Read-Modify-Write sequence. Because it allows page-level erasure and byte-aligned writes via buffer manipulation, it enables bit- or byte-alterable storage without external wear-leveling firmware. This capability is explicitly validated in Atmel Application Note AN-4 and confirmed in the "EEPROM emulation" section of the AT45DB161B-TC-2.5 datasheet.
What is the purpose of the RDY/BUSY pin on the AT45DB161B-TC-2.5?
The RDY/BUSY pin on the AT45DB161B-TC-2.5 is an open-drain output that drives low during all self-timed operations - including page erase, buffer-to-Flash programming, and main memory page-to-buffer transfers. It provides hardware handshaking to prevent command collisions and enables interrupt-driven host control. The pin remains functional even when SO is tri-stated, making it essential for deterministic real-time system design using the AT45DB161B-TC-2.5.
AT45DB161B-TC-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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSOP
AT45DB161B-TC-2.5 FAQ
1.How can I place an order for AT45DB161B-TC-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB161B-TC-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-TC-2.5 reliable?
The price and inventory of AT45DB161B-TC-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-TC-2.5 is usually 5 days.
3.What payment methods are accepted for AT45DB161B-TC-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB161B-TC-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB161B-TC-2.5?
AT45DB161B-TC-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB161B-TC-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-TC-2.5?
For technical support, including AT45DB161B-TC-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB161B-TC-2.5 requirements.
6.How does Aetrix verify that AT45DB161B-TC-2.5 is sourced from the original manufacturer or authorized distributors?
All AT45DB161B-TC-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-TC-2.5 meets industry standards.
7.What is the process for return or replacement of AT45DB161B-TC-2.5?
All AT45DB161B-TC-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB161B-TC-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-TC-2.5 part is unused and in its original packaging.
Return procedure for AT45DB161B-TC-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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