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Microchip Technology AT45DB161-JI
- Part No.:
- AT45DB161-JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT45DB161-JI.pdf
- Description:
- IC FLASH 16MBIT SPI 13MHZ 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,979
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Product details
Overview
AT45DB161-JI from Microchip Technology is a 16-Mbit serial DataFlash® memory IC operating from a single 2.7V–3.6V supply, organized as 4096 pages × 528 bytes (17,301,504 bits), featuring dual 528-byte SRAM buffers and SPI-compatible interface (Modes 0 and 3) for in-system reprogramming in embedded data logging applications.
For engineers reviewing the AT45DB161-JI datasheet, AT45DB161-JI pinout, AT45DB161-JI application, or AT45DB161-JI equivalent, this device delivers page-erase flexibility, 7 ms typical page program time, hardware write protection via WP pin, and ready/busy status reporting - critical for real-time firmware update and voice/image storage systems requiring deterministic timing and low-voltage operation.
Technical Context
The AT45DB161-JI implements a serial Flash architecture with two independent 528-byte SRAM buffers enabling concurrent data reception (into one buffer) while reprogramming nonvolatile memory (from the other), eliminating bus contention during firmware patching or audio streaming. Its SPI interface supports both Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=0), with clock frequencies up to 13 MHz.
Memory is hierarchically segmented into 16 sectors (135,168 bytes each), 512 blocks (4224 bytes each), and 4096 pages (528 bytes each), allowing granular erase at page (6–10 ms) or block (7–15 ms) level. All program/erase operations are self-timed and require no external high-voltage programming signal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 16 Mbit (17,301,504 bits), organized as 4096 × 528-byte pages - enables compact storage of firmware images or sensor logs without parallel address/data buses. |
| Supply Voltage | 2.7V–3.6V single supply - compatible with 3.3V logic systems and eliminates need for voltage translators or dual-rail power design. |
| Interface | SPI-compatible (Modes 0 and 3), 3-wire + CS/RESET/WP/RDY - reduces PCB routing complexity and EMI vs. parallel NOR/NAND Flash. |
| Page Program Time | 7 ms typical - supports rapid field updates; full 4096-page array programmable in ~28.7 seconds worst-case (excluding overhead). |
| Buffer Transfer Time | 120 µs typical page-to-buffer transfer - allows near-overlapping I/O and Flash programming for continuous data capture. |
| Active Read Current | 4 mA typical at 13 MHz - enables low-power operation in battery-backed data loggers or portable medical devices. |
| Standby Current | 3 µA typical - supports ultra-low-power sleep modes between data acquisition intervals. |
| Operating Temp | -40°C to +85°C (industrial grade) - validated for deployment in automotive telematics, industrial controllers, and outdoor IoT nodes. |
Pinout & Package
AT45DB161-JI is available in 28-pin SOIC, 28-pin TSOP, 32-pin PLCC, and 25-ball CBGA packages. The JI suffix denotes industrial temperature range (-40°C to +85°C) and SOIC package per Microchip's ordering nomenclature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable for SPI command sequence; must remain low during opcode/address/data transfer. |
| SCK | Serial Clock | Master-generated clock (≤13 MHz); sampling edge depends on SPI mode (Mode 0: rising; Mode 3: falling). |
| SI | Serial Input | Command opcodes, addresses, and write data entered MSB-first; setup/hold times referenced to SCK edge. |
| SO | Serial Output | Read data, status register bits, or compare results output MSB-first; tri-stated when CS high. |
| WP | Hardware Page Write Protect | Low = protects first 256 pages from program/erase; internal pull-up allows omission if unused. |
| RESET | Chip Reset | Active-low asynchronous reset; terminates ongoing operation and returns state machine to idle; internal pull-up. |
| RDY/BUSY | Ready/Busy Indicator | Open-drain output pulled high externally; driven low during self-timed operations (program/erase/transfer). |
| VCC / GND | Power Supply | 2.7V–3.6V core supply; decoupling capacitor required per datasheet layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 528-byte SRAM buffers | Enables pipelined operation: receive new data into one buffer while programming previous data from the other into Flash - essential for uninterrupted audio streaming or sensor burst capture. |
| Single-cycle page erase + program | Eliminates separate erase step; 83H/86H opcodes perform full page reprogramming in ≤20 ms - simplifies firmware update logic and reduces host MCU intervention. |
| Page-to-buffer compare (60H/61H) | Verifies Flash integrity after programming by comparing 528-byte page against buffer contents; result reported in status register bit 6 - enables robust error detection without host-side checksum calculation. |
| Hardware write protection (WP pin) | Physically prevents accidental overwrite of critical boot code or calibration data stored in first 256 pages - adds fail-safe layer beyond software locks. |
| Status register polling | Bit 7 indicates RDY/BUSY state; allows host to avoid fixed delays and optimize throughput via active polling - critical for deterministic real-time response in motor control or safety-critical logging. |
| Industrial temperature range | Validated operation from -40°C to +85°C - ensures reliability in under-hood automotive modules, factory-floor PLCs, and outdoor environmental monitors. |
Applications
| Firmware Storage | Voice Recording System |
|---|---|
|
Use Scenario: Storing bootloader, application firmware, and configuration parameters in an automotive ECU with over-the-air update capability. IC Role / Device Role / Timing Role: Nonvolatile storage medium interfaced via SPI to microcontroller; provides page-erasable, low-voltage reprogrammability without external high-voltage circuitry. Use Value: Enables secure, field-upgradable firmware using only 3.3V supply and standard SPI - reducing BOM cost and board space vs. parallel Flash or EEPROM. |
Use Scenario: Capturing and replaying voice prompts in a smart home speaker with local playback capability. IC Role / Device Role / Timing Role: Serial Flash memory buffering audio samples via dual SRAM buffers; supports simultaneous recording (to buffer 1) and playback (from buffer 2). Use Value: 120 µs page-to-buffer transfer and 7 ms program time allow seamless gapless recording at 8 kHz mono PCM - no dropped samples during Flash writes. |
| Industrial Data Logger | Digital Camera Image Buffer |
|
Use Scenario: Logging temperature, pressure, and humidity sensor readings every 10 seconds in a remote weather station powered by solar/battery. IC Role / Device Role / Timing Role: Low-power nonvolatile storage with 3 µA standby current; WP pin protects calibration tables; RDY/BUSY pin synchronizes MCU sleep/wake cycles. Use Value: Extends battery life to >5 years in deep-sleep mode while ensuring data integrity across 10,000+ write cycles - validated for industrial temperature range. |
Use Scenario: Temporary image storage in a compact digital camera before transferring JPEG frames to SD card or host PC. IC Role / Device Role / Timing Role: High-speed serial buffer supporting 13 MHz SPI clock; page-erase granularity allows efficient overwrite of partial frame buffers. Use Value: 13 MHz max clock and dual-buffer architecture enable >1.2 MB/s effective write throughput - sufficient for burst-mode capture of 5 MP images at 3 fps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT45DB161B-JI | Successor revision with enhanced reliability, improved tEP consistency (10–20 ms), and updated AC timing specs; pinout and command set identical. | Same use cases, but preferred for new designs per Microchip recommendation; backward-compatible drop-in replacement. | Select AT45DB161B-JI for new designs to ensure long-term availability and latest qualification; AT45DB161-JI remains suitable for legacy repair or continuity builds. |
| W25Q16JVSSIQ | 16 Mbit Quad SPI Flash (Winbond); supports QSPI x4 mode (up to 104 MHz), smaller 8-pin SOIC package, no dual SRAM buffers or auto-erase-on-program. | Better raw throughput in QSPI mode, but lacks built-in buffer overlap - requires host-managed erase/program sequencing and larger software overhead. | Choose W25Q16JVSSIQ when maximum read speed or minimal footprint is critical; retain AT45DB161-JI when deterministic page-level reprogrammability and hardware-assisted buffering are required. |
Compared with AT45DB161B-JI, the AT45DB161-JI offers identical functionality but older revision-level reliability specs; versus W25Q16JVSSIQ, it trades raw bandwidth for integrated buffer management and simpler host firmware - making it superior for latency-sensitive, low-CPU-overhead embedded logging.
Availability
AT45DB161-JI is available at Aetrix Electronics and suitable for firmware storage, voice recording systems, industrial data loggers, and digital camera image buffering requiring stable component supply across extended production lifecycles.
Supply support for AT45DB161-JI 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 components, and memory solutions, with a focus on embedded control and connectivity.
The AT45DB161-JI belongs to Microchip's DataFlash® family, designed specifically for applications demanding reliable, low-pin-count, in-system reprogrammable serial Flash memory with integrated SRAM buffers for seamless data flow.
FAQ
What is the maximum SPI clock frequency supported by the AT45DB161-JI?
The AT45DB161-JI supports a maximum SCK frequency of 13 MHz, as specified in its AC characteristics table. This allows high-throughput data transfers while maintaining compatibility with standard 3.3V SPI peripherals. Operation above this frequency may result in timing violations or unreliable communication. The AT45DB161-JI's internal logic is fully characterized up to 13 MHz across its industrial temperature range.
Does the AT45DB161-JI require a high-voltage programming signal?
No, the AT45DB161-JI operates entirely from a single 2.7V–3.6V supply for both read and program/erase functions. It does not require external high-voltage generators or charge pumps. All programming cycles are internally self-timed, and the AT45DB161-JI achieves full page erasure and reprogramming using only its core VCC rail - simplifying power design and improving system safety.
How does the dual-buffer architecture of the AT45DB161-JI improve system performance?
The AT45DB161-JI's two independent 528-byte SRAM buffers enable true pipelining: while one buffer streams data to Flash (e.g., via 83H opcode), the other simultaneously accepts new data via SI pin. This eliminates idle time during page programming (7 ms typical), allowing continuous data acquisition in applications like audio recording or sensor logging - a capability not present in standard SPI Flash devices.
What is the function of the RDY/BUSY pin on the AT45DB161-JI?
The RDY/BUSY pin on the AT45DB161-JI is an open-drain output that signals active self-timed operations. It is pulled low during page programming, block erasing, page-to-buffer transfers, or compare operations. Host systems can either poll this pin or monitor it asynchronously to determine when the AT45DB161-JI is ready for the next command - avoiding fixed delay loops and optimizing real-time responsiveness.
Is the AT45DB161-JI pin-compatible with the AT45DB161B-JI?
Yes, the AT45DB161-JI and AT45DB161B-JI share identical pinouts, electrical characteristics, command set, and package options. Microchip explicitly recommends AT45DB161B-JI for new designs as a direct replacement, confirming functional and mechanical compatibility. No PCB layout changes are required when migrating from AT45DB161-JI to AT45DB161B-JI in existing designs.
AT45DB161-JI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- 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:
- 13 MHz
- Write Cycle Time - Word, Page:
- 15ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT45DB161-JI FAQ
1.How can I place an order for AT45DB161-JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB161-JI 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 AT45DB161-JI reliable?
The price and inventory of AT45DB161-JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB161-JI is usually 5 days.
3.What payment methods are accepted for AT45DB161-JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB161-JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB161-JI?
AT45DB161-JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB161-JI 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 AT45DB161-JI?
For technical support, including AT45DB161-JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB161-JI requirements.
6.How does Aetrix verify that AT45DB161-JI is sourced from the original manufacturer or authorized distributors?
All AT45DB161-JI 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 AT45DB161-JI meets industry standards.
7.What is the process for return or replacement of AT45DB161-JI?
All AT45DB161-JI units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB161-JI, 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 AT45DB161-JI part is unused and in its original packaging.
Return procedure for AT45DB161-JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT45DB161-JI Tags
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