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Microchip Technology AT45DB161B-RI
- Part No.:
- AT45DB161B-RI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.342", 8.69mm Width)
- Datasheet:
-
AT45DB161B-RI.pdf
- Description:
- IC FLASH 16MBIT SPI 20MHZ 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,099
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Product details
Overview
AT45DB161B-RI 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–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 embedded code shadowing and firmware storage in resource-constrained microcontroller systems.
For engineers reviewing the AT45DB161B-RI datasheet, AT45DB161B-RI pinout, AT45DB161B-RI application, or AT45DB161B-RI equivalent, key selection considerations include its page-erase capability, continuous array read mode for seamless code execution, 5.0V-tolerant control pins (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-RI implements a dedicated SPI-based Flash architecture with no parallel address bus - all operations are command-driven via 8-bit opcodes followed by address and data sequences. Its two independent 528-byte SRAM buffers enable concurrent data reception (into one buffer) while reprogramming nonvolatile memory (from the other), supporting true pipelined I/O.
Memory organization is hierarchical: 4096 pages (528 B/page) grouped into 512 blocks of 8 pages each (4224 B/block); erase is supported at page or block level, while program operations always target full pages. The device uses internal self-timed algorithms for erase (tPE ≤ 20 ms), program (tP ≤ 5 ms), and auto-rewrite (tEP ≤ 25 ms), with status register bit 7 indicating readiness via RDY/BUSY pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 16 Mbit (17,301,504 bits), organized as 4096 × 528-byte pages - enables compact firmware storage without external address decoding logic. |
| Supply Voltage | 2.5V–3.6V or 2.7V–3.6V single supply - eliminates need for charge pumps or high-voltage programming circuits. |
| Max Clock Frequency | 20 MHz SPI clock - supports high-throughput data streaming in real-time logging or audio buffering applications. |
| Active Read Current | 4 mA typical - reduces power budget impact in battery-powered IoT edge nodes during firmware fetch or configuration reads. |
| Standby Current | 2 µA typical CMOS standby - enables ultra-low-power retention during MCU sleep modes. |
| Write Protection | Hardware WP pin protects first 256 pages - prevents accidental overwrite of bootloader or calibration data in field-deployed devices. |
| VIH Tolerance | 5.0V-tolerant SI, SCK, CS, RESET, WP inputs - allows direct interfacing with 5V MCUs without level shifters. |
Pinout & Package
AT45DB161B-RI is available in 28-pin TSOP (Type 1, 10.16 mm × 11.2 mm), SOIC, and CBGA packages. The -RI suffix denotes industrial temperature range (–40°C to +85°C) and TSOP packaging per standard Microchip ordering nomenclature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable for SPI command initiation; falling edge starts opcode loading sequence. |
| SCK | Serial Clock | Input-only clock; data latched on rising edge (SI), output on falling edge (SO); supports SPI Mode 0/3. |
| SI | Serial Input | Command, address, and data input path; 5.0V-tolerant for mixed-voltage system interfacing. |
| SO | Serial Output | Command response, status register, and memory/buffer data output; tri-stated when CS high. |
| WP | Write Protect | Active-low hardware lock for first 256 pages; prevents inadvertent firmware corruption during updates. |
| RESET | Chip Reset | Active-low asynchronous reset of internal state machine; required before recovery from invalid command sequences. |
| RDY/BUSY | Ready/Busy Indicator | Open-drain output pulled high externally; driven low during erase, program, compare, or transfer operations. |
| VCC, GND | Power Supply | Single 2.5–3.6V supply; decoupling capacitor placement critical for stable 20 MHz operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM Buffers (528 B each) | Enables simultaneous data ingestion into one buffer while programming the other to Flash - eliminates I/O stalls in continuous data loggers. |
| Continuous Array Read Mode | Supports uninterrupted sequential read across page boundaries using opcodes 68H/E8H - essential for executing code directly from Flash (XIP-like behavior). |
| Page-Level Erase & Program | Allows granular firmware patching without erasing entire sectors - reduces update time and wear on unaffected memory regions. |
| Self-Contained Read-Modify-Write | Three-step internal algorithm (read → modify in buffer → program back) enables byte-level EEPROM emulation without host MCU overhead. |
| Status Register Monitoring | Bit 7 (RDY/BUSY) provides hardware handshake for timing-critical host polling - avoids fixed-delay busy-wait loops in embedded firmware. |
Applications
| Industrial Firmware Storage | Medical Device Configuration |
|---|---|
Use Scenario: Storing and updating bootloaders, application binaries, and calibration tables in programmable logic controllers (PLCs) and motor drives. IC Role / Device Role / Timing Role: Nonvolatile firmware repository with page-erase granularity and hardware write protection for safe over-the-air (OTA) updates. Use Value: Prevents bricking during partial updates via Auto Page Rewrite and ensures bootloader integrity using WP pin lockdown. | Use Scenario: Retaining patient-specific settings, sensor calibration coefficients, and audit logs in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, low-power configuration memory with EEPROM-emulation capability for infrequent but critical parameter writes. Use Value: Achieves >100,000 write cycles per page via buffer-assisted Read-Modify-Write, exceeding standard Flash endurance limits. |
| Consumer Audio Buffering | Automotive Telematics Logging |
Use Scenario: Streaming voice prompts and audio clips in smart home hubs and voice assistants with minimal MCU RAM usage. IC Role / Device Role / Timing Role: Continuous-read-capable serial memory acting as off-chip audio sample buffer, accessed via SPI DMA. Use Value: Eliminates need for external SRAM by leveraging dual buffers for ping-pong streaming - reduces BOM cost and PCB area. | Use Scenario: Capturing CAN bus diagnostics, GPS coordinates, and event-triggered crash data in vehicle black-box recorders. IC Role / Device Role / Timing Role: High-reliability, low-latency data logger with block-erase optimization for rapid cyclic overwrite of rolling buffers. Use Value: Block Erase (50H) clears 8-page segments in ≤100 ms, enabling deterministic 1-second logging intervals under worst-case conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| W25Q16JVSSIQ | 16 Mbit Quad SPI NOR Flash; 1.8V–3.6V supply; no integrated SRAM buffers; supports QPI/DTR modes. | Lacks continuous read and buffer pipelining; requires host-managed erase/program sequencing. | Choose for higher throughput in QSPI-configured hosts; avoid if buffer-assisted streaming or EEPROM emulation is required. |
| AT45DB161D-SU | Successor revision with enhanced reliability; identical pinout, timing, and command set; supports same 2.5V/2.7V supply ranges. | Drop-in replacement with extended lifecycle support; same industrial temp grade (-40°C to +85°C). | Select for new designs requiring long-term availability; legacy AT45DB161B-RI remains valid for existing production. |
Compared with W25Q16JVSSIQ, AT45DB161B-RI offers built-in dual buffers and hardware-assisted EEPROM emulation but lacks Quad SPI speed; versus AT45DB161D-SU, it shares identical functionality but has reached end-of-life status per Microchip PCN notices - making D-SU the recommended upgrade path for volume production.
Availability
AT45DB161B-RI is available at Aetrix Electronics and suitable for industrial firmware storage, medical device configuration, and consumer audio buffering requiring stable component supply and long-lifecycle support.
Supply support for AT45DB161B-RI 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 is a global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with a focus on robust, low-power, and secure embedded components.
The AT45DB161B-RI belongs to Microchip's DataFlash family - designed specifically for SPI-based embedded systems needing high-density serial memory with integrated buffering and simplified in-system reprogrammability.
FAQ
What is the maximum SPI clock frequency supported by the AT45DB161B-RI?
The AT45DB161B-RI supports a maximum SPI clock frequency of 20 MHz for all read, write, and status operations. This rating applies across the full industrial temperature range (–40°C to +85°C) and 2.5V–3.6V supply voltage. Timing compliance must be verified against tCYCLE (≥50 ns) and tCH/tCL (≥25 ns) parameters in the official Microchip datasheet Rev. 2224G.
Does the AT45DB161B-RI require high-voltage programming signals?
No, the AT45DB161B-RI does not require high-voltage programming signals. All program and erase operations are performed using only the standard 2.5V–3.6V or 2.7V–3.6V VCC supply. Internal charge pumps generate necessary voltages, eliminating external HV circuitry - a key design simplification versus traditional parallel NOR Flash devices.
How does the RDY/BUSY pin function on the AT45DB161B-RI?
The RDY/BUSY pin on the AT45DB161B-RI is an open-drain output that is pulled low during internally self-timed operations (e.g., page erase, buffer-to-Flash program, page compare). It returns high when idle or ready. Host systems must use an external 1 kΩ pull-up resistor; polling bit 7 of the status register provides identical functional information via SPI.
Can the AT45DB161B-RI be used for EEPROM emulation, and how is it implemented?
Yes, the AT45DB161B-RI supports EEPROM emulation via a self-contained three-step Read-Modify-Write operation: (1) transfer target page to buffer, (2) modify desired bytes in buffer, (3) program buffer back to same page. This avoids host-side wear-leveling logic and achieves effective byte-alterability - confirmed in Microchip Application Note AN-4.
What package and temperature grade does the "-RI" suffix indicate for AT45DB161B-RI?
Per Microchip's ordering nomenclature, the "-RI" suffix on AT45DB161B-RI specifies the 28-pin TSOP (Thin Small Outline Package) with industrial temperature range (–40°C to +85°C). This is distinct from "-SU" (SOIC) or "-C" (commercial 0°C to +70°C) variants, and matches the pinout shown in Figure 1 of datasheet Rev. 2224G.
AT45DB161B-RI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-SOIC (0.342", 8.69mm Width)
- Packaging:
- Tube
- 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-SOIC
AT45DB161B-RI FAQ
1.How can I place an order for AT45DB161B-RI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB161B-RI 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-RI reliable?
The price and inventory of AT45DB161B-RI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB161B-RI is usually 5 days.
3.What payment methods are accepted for AT45DB161B-RI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB161B-RI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB161B-RI?
AT45DB161B-RI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB161B-RI 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-RI?
For technical support, including AT45DB161B-RI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB161B-RI requirements.
6.How does Aetrix verify that AT45DB161B-RI is sourced from the original manufacturer or authorized distributors?
All AT45DB161B-RI 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-RI meets industry standards.
7.What is the process for return or replacement of AT45DB161B-RI?
All AT45DB161B-RI units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB161B-RI, 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-RI part is unused and in its original packaging.
Return procedure for AT45DB161B-RI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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