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Microchip Technology AT45DB161B-TI
- Part No.:
- AT45DB161B-TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
AT45DB161B-TI.pdf
- Description:
- IC FLASH 16MBIT SPI 20MHZ 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,805
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Product details
Overview
AT45DB161B-TI from Atmel (now Microchip) 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–3.6V or 2.7V–3.6V supply, supports up to 20 MHz clock frequency, and delivers 4 mA typical active read current - ideal for code shadowing and embedded firmware storage in resource-constrained systems.
For engineers reviewing the AT45DB161B-TI datasheet, AT45DB161B-TI pinout, AT45DB161B-TI application, or AT45DB161B-TI equivalent, key selection considerations include its page-erase flexibility, continuous array read capability, 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 microcontroller integration.
Technical Context
The AT45DB161B-TI implements a serial Flash architecture with hierarchical memory organization: 4096 pages (528 B/page), grouped into 512 blocks (8 pages/block) and 17 sectors. Its dual-buffer architecture enables concurrent data reception into one buffer while reprogramming the other into nonvolatile memory - eliminating write stalls in streaming applications.
It uses self-timed internal erase-and-program operations with no external high-voltage programming required. All commands (read, program, erase, compare, transfer) are issued via 8-bit opcodes followed by address/don't-care sequences over the SPI interface, supporting both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 16 Mbit (17,301,504 bits), organized as 4096 × 528-byte pages - provides compact, high-density serial storage without parallel bus overhead. |
| Supply Voltage | 2.5V–3.6V or 2.7V–3.6V single supply - simplifies power design and enables direct interfacing with 2.5V/3.3V logic domains. |
| Max Clock Frequency | 20 MHz - enables fast sequential read throughput (up to ~2.5 MB/s theoretical) for boot code or audio streaming. |
| Active Read Current | 4 mA typical - minimizes system power draw during firmware execution or data retrieval in battery-powered devices. |
| Standby Current | 2 µA typical - ensures ultra-low quiescent power during sleep modes or idle periods in industrial controllers. |
| Input Voltage Tolerance | 5.0V-tolerant on CS, SCK, SI, WP, RESET pins - eliminates level-shifting requirements when interfacing with legacy 5V microcontrollers. |
| Temperature Range | Commercial (0°C to +70°C) and Industrial (–40°C to +85°C) grades - validated for deployment in automotive infotainment head units and factory automation PLCs. |
Pinout & Package
AT45DB161B-TI is available in TSOP-28 (Type 1), SOIC-28, and CBGA-24 packages. The TSOP-28 variant is the most widely used industrial-grade option, with 28-pin surface-mount footprint and standard JEDEC-compliant lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; falling edge initiates command sequence and must remain low throughout instruction, address, and data transfer. |
| SCK | Serial Clock | Input-only clock; data latched on rising edge (SI), output shifted on falling edge (SO); supports SPI Mode 0/3 with 5.0V tolerance. |
| SI | Serial Input | Command, address, and data input path; accepts 8-bit opcodes, 24-bit addresses, and payload data with MSB-first ordering. |
| SO | Serial Output | Command response, status register, and memory/buffer data output; tri-stated when CS is high. |
| WP | Hardware Write Protect | Active-low pin that locks first 256 pages (132 KB) against accidental reprogramming - critical for bootloader partition protection. |
| RESET | Chip Reset | Active-low asynchronous reset; terminates ongoing operation and returns state machine to idle - essential for recovery after power brownout. |
| RDY/BUSY | Ready/Busy Indicator | Open-drain output pulled high externally; driven low during self-timed operations (e.g., page program, block erase, buffer transfer) to signal host wait state. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 528-byte SRAM buffers | Enables pipelined operation: receive new data into Buffer 1 while programming Buffer 2 into Flash - sustains continuous data flow without host CPU intervention. |
| Continuous Array Read | Single opcode (68H/E8H) + 24-bit start address initiates uninterrupted streaming from any location; wraps across page boundaries with zero latency - ideal for audio playback or firmware shadowing. |
| Page- and block-level erase | Supports granular erasure: 528-byte page erase (81H) for fine updates or 4224-byte block erase (50H) for bulk writes - reduces wear and improves endurance in logging applications. |
| Self-contained EEPROM emulation | Three-step Read-Modify-Write via buffers allows byte-level alterations without external software overhead - simplifies parameter storage in medical device calibration tables. |
| Hardware data protection | Combines WP pin locking of top 256 pages with status-register-controlled Ready/Busy signaling - prevents corruption during power loss or interrupt latency spikes. |
Applications
| Firmware Storage | Audio Data Buffering |
|---|---|
|
Use Scenario: Storing boot code and application firmware for ARM Cortex-M microcontrollers in IoT edge nodes. IC Role / Device Role / Timing Role: Nonvolatile serial code storage with fast continuous read and page-program capability - replaces parallel NOR Flash with 40% smaller PCB footprint. Use Value: Enables secure, field-upgradable firmware using SPI-based OTA updates while maintaining <100 µs page-program time and hardware write lock for bootloader integrity. |
Use Scenario: Streaming compressed voice prompts from industrial HMI panels with real-time playback. IC Role / Device Role / Timing Role: High-throughput sequential data buffer - leverages Continuous Array Read mode to deliver uninterrupted 8-bit PCM at 8 kHz sampling rate. Use Value: Eliminates external FIFOs by sustaining >2 MB/s read bandwidth with automatic page-wrap behavior - reduces BOM count and layout complexity. |
| Parameter Logging | Calibration Data Retention |
|
Use Scenario: Recording sensor readings (temperature, pressure) every 10 seconds in environmental monitoring gateways. IC Role / Device Role / Timing Role: Wear-leveling–capable data logger - uses block-erase + buffer-write cycles to distribute write stress across 512 physical blocks. Use Value: Achieves >100,000 program/erase cycles per block via intelligent sector management - extends field life beyond 10 years at 10-sec logging intervals. |
Use Scenario: Storing factory-calibrated ADC offset/gain coefficients and user-tuned PID constants in medical infusion pumps. IC Role / Device Role / Timing Role: Byte-alterable nonvolatile storage - implements EEPROM emulation via Read-Modify-Write using internal buffers. Use Value: Preserves calibration accuracy across 10,000+ power cycles with guaranteed data retention >20 years at 85°C - meets IEC 62304 Class C 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 |
|---|---|---|---|
| AT45DB161D-TU | Successor revision with enhanced ESD robustness (±4 kV HBM), identical pinout, timing, and command set - no firmware or layout changes required. | Preferred for new designs targeting AEC-Q200 qualification or higher reliability in automotive body electronics. | Select AT45DB161D-TU when long-term supply continuity and improved latch-up immunity are prioritized over legacy part obsolescence risk. |
| W25Q16JVSSIQ | 16-Mbit Quad SPI Flash (Winbond) with faster 104 MHz DTR read, but lacks dual buffers, continuous array read, and hardware WP pin - requires software-managed wear leveling. | Better suited for high-speed code XIP (execute-in-place) where random access latency matters more than streaming throughput. | Choose W25Q16JVSSIQ only if migrating to QSPI interface and accepting trade-offs in buffer-assisted streaming and EEPROM emulation capability. |
Compared with AT45DB161D-TU, the AT45DB161B-TI offers identical functionality but lower ESD rating; versus W25Q16JVSSIQ, it trades raw speed for deterministic streaming, built-in buffering, and simpler firmware integration - making it optimal for cost-sensitive, streaming-centric embedded systems.
Availability
AT45DB161B-TI is available at Aetrix Electronics and suitable for firmware storage, audio buffering, parameter logging, and calibration data retention requiring stable component supply across industrial, medical, and automotive production programs.
Supply support for AT45DB161B-TI 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) is a leading provider of microcontrollers, analog, Flash memory, and security solutions, serving industrial, automotive, communications, and consumer markets with vertically integrated silicon and development tools.
The AT45DB161B-TI belongs to Atmel's DataFlash® family - designed specifically for embedded systems needing high-density serial Flash with streaming-friendly architecture, dual-buffer concurrency, and simplified SPI-based firmware/data management.
FAQ
What is the maximum clock frequency supported by the AT45DB161B-TI?
The AT45DB161B-TI supports a maximum serial clock (SCK) frequency of 20 MHz for all read, write, and command operations. This specification is guaranteed across the full commercial and industrial temperature ranges and enables sustained data transfer rates up to approximately 2.5 MB/s in continuous read mode. The AT45DB161B-TI maintains timing compliance without requiring external clock dividers or special host controller configurations.
Does the AT45DB161B-TI require high-voltage programming?
No, the AT45DB161B-TI does not require high-voltage programming. It operates entirely from its core supply voltage (2.5V–3.6V or 2.7V–3.6V) for both read and program/erase functions. All internal erase-and-program cycles are self-timed and fully managed by on-chip circuitry - eliminating the need for external VPP generators or complex voltage sequencing. This simplifies system design and enhances reliability in battery-powered or low-noise applications.
How does the RDY/BUSY pin function on the AT45DB161B-TI?
The RDY/BUSY pin on the AT45DB161B-TI is an open-drain output that signals internal operation status: it remains high (via external 1 kΩ pull-up) when idle and is actively driven low during self-timed operations such as page programming, block erasing, buffer transfers, or status polling. Host firmware can either poll this pin or use it as an interrupt source to avoid busy-wait loops - ensuring deterministic timing for real-time systems using the AT45DB161B-TI.
Can the AT45DB161B-TI emulate EEPROM functionality?
Yes, the AT45DB161B-TI supports true EEPROM emulation through a self-contained three-step Read-Modify-Write operation using its dual SRAM buffers. A page is first transferred from Flash to a buffer, modified in-place, then written back - enabling reliable byte- or bit-level updates without external software wear-leveling. This capability is intrinsic to the AT45DB161B-TI architecture and requires no additional controller resources or firmware overhead.
What package options are available for the AT45DB161B-TI?
The AT45DB161B-TI is offered in three industry-standard packages: 28-pin TSOP-I (Type 1), 28-pin SOIC, and 24-ball CBGA. The TSOP-28 variant is the most commonly stocked and recommended for industrial applications due to its thermal performance, board-level reliability, and compatibility with automated optical inspection (AOI). All packages share identical pin functions and electrical specifications - allowing drop-in substitution based on mechanical or thermal constraints.
AT45DB161B-TI 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:
- 20 MHz
- Write Cycle Time - Word, Page:
- 14ms
- 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
AT45DB161B-TI FAQ
1.How can I place an order for AT45DB161B-TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB161B-TI 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 reliable?
The price and inventory of AT45DB161B-TI 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 is usually 5 days.
3.What payment methods are accepted for AT45DB161B-TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB161B-TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB161B-TI?
AT45DB161B-TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB161B-TI 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?
For technical support, including AT45DB161B-TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB161B-TI requirements.
6.How does Aetrix verify that AT45DB161B-TI is sourced from the original manufacturer or authorized distributors?
All AT45DB161B-TI 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 meets industry standards.
7.What is the process for return or replacement of AT45DB161B-TI?
All AT45DB161B-TI units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB161B-TI, 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 part is unused and in its original packaging.
Return procedure for AT45DB161B-TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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