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Microchip Technology AT45DB161-CI
- Part No.:
- AT45DB161-CI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 24-LBGA, CSPBGA
- Datasheet:
-
AT45DB161-CI.pdf
- Description:
- IC FLASH 16MBIT SPI 13MHZ 24CBGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,802
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Product details
Overview
AT45DB161-CI 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 with dual 528-byte SRAM buffers. It supports SPI Modes 0 and 3, delivers 7 ms typical page program time, and enables concurrent buffer loading while reprogramming nonvolatile memory - ideal for embedded voice, image, and firmware storage in space-constrained industrial systems.
For engineers reviewing the AT45DB161-CI datasheet, AT45DB161-CI pinout, AT45DB161-CI application, or AT45DB161-CI equivalent, this page provides verified pin functions, real-world timing behavior (13 MHz max SCK, 250 µs typical page-to-buffer transfer), hardware write protection (WP pin), ready/busy signaling (RDY/BUSY), and confirmed alternative options for legacy design continuity and migration paths.
Technical Context
The AT45DB161-CI implements a three-tiered memory architecture (sector/block/page) with 16 Mbit density mapped to 4096 × 528-byte pages. Its dual SRAM buffers enable pipelined operation: one buffer accepts incoming data via SI while the other transfers or programs to Flash, eliminating idle cycles during in-system reprogramming.
Command execution is fully self-timed - no external erase cycle required before programming. All operations (page program, block erase, buffer compare) are initiated via 8-bit opcodes (e.g., 83H for buffer-to-page program with built-in erase), with address resolution using PA11–PA0 (page) and BFA9–BFA0 (buffer offset). Hardware page write protection (WP) disables reprogramming of first 256 pages when pulled low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 16 Mbit (17,301,504 bits), organized as 4096 pages × 528 bytes - supports high-fidelity audio/image storage without parallel bus overhead |
| Supply Voltage | 2.7V–3.6V single supply - eliminates need for voltage translators in 3.3V systems and simplifies power design |
| Max Clock Frequency | 13 MHz SCK - enables ~6.5 MB/s burst read throughput via SPI interface |
| Page Program Time | 7 ms typical - defines minimum latency between successive page writes in firmware update sequences |
| Page-to-Buffer Transfer | 120 µs typical - allows rapid preload of next page into buffer while current page is being programmed |
| Standby Current | 3 µA typical - critical for battery-backed data loggers and always-on sensor nodes |
| Interface Standard | SPI Modes 0 and 3 compatible - ensures interoperability with ARM Cortex-M, PIC, and FPGA host controllers |
Pinout & Package
AT45DB161-CI is available in 28-pin SOIC, 28-pin TSOP, 32-pin PLCC, and 25-ball CBGA packages. Pin functions are identical across all variants per Microchip datasheet Rev. 0807E.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable for SPI command sequence; must remain low during opcode, address, and data transfer |
| SCK | Serial Clock | Host-generated clock synchronizing all SI/SO data; supports 13 MHz max frequency with 35 ns min high/low time |
| SI | Serial Input | CMOS/TTL-compatible input receiving opcodes, addresses, and buffer data MSB-first |
| SO | Serial Output | Open-drain output for read data/status; requires external pull-up; tri-stated on CS high |
| WP | Hardware Page Write Protect | Pulls low to lock first 256 pages; internally pulled high - optional connection if protection unused |
| RESET | Chip Reset | Active-low signal aborting ongoing operation and resetting internal state machine; internally pulled high |
| RDY/BUSY | Ready/Busy Indicator | Open-drain output driven low during self-timed operations (program/erase/transfer); used for polling or interrupt |
| VCC / GND | Power Supply | 2.7V–3.6V core supply; decoupling capacitor required within 10 mm of pins per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Dual 528-byte SRAM buffers | Enables simultaneous data reception (via SI) and Flash programming - eliminates host wait states in streaming applications |
| Single-cycle page reprogram | Integrates erase + program in one command (e.g., opcode 83H), removing external erase scheduling logic |
| Hardware page write protection | WP pin physically disables reprogramming of first 256 pages - prevents accidental corruption of boot code or calibration data |
| 120 µs page-to-buffer transfer | Allows preloading of next page into buffer during active programming - reduces effective write latency by >98% |
| Status register bit 7 (RDY/BUSY) | Provides real-time readiness flag for software polling - avoids fixed-delay loops and improves deterministic timing |
Applications
| Digital Voice Recorder | Industrial Firmware Update Module |
|---|---|
Use Scenario: Standalone voice recorder capturing 8-bit PCM audio at 8 kHz sampling rate for security or maintenance logging. IC Role / Device Role / Timing Role: Nonvolatile storage for up to 30 minutes of audio; buffers absorb variable host write timing while Flash programs in background. Use Value: Eliminates need for external RAM buffering; 7 ms page program time enables seamless recording without dropouts during sector boundary transitions. |
Use Scenario: Field-upgradable PLC controller storing firmware images and configuration parameters across multiple versions. IC Role / Device Role / Timing Role: Dual-buffer architecture allows new firmware to be loaded into buffer 2 while buffer 1 contents are verified and written to Flash. Use Value: WP pin protects first 256 pages containing bootloader; status register polling ensures atomic update completion before system reset. |
| Medical Sensor Data Logger | Smart Meter Firmware Storage |
Use Scenario: Battery-powered ECG monitor logging timestamped waveform data over 72-hour periods. IC Role / Device Role / Timing Role: Low-power nonvolatile memory with 3 µA standby current; RDY/BUSY pin triggers wake-up only when ready for next write. Use Value: 16 Mbit capacity stores >2 million 16-bit samples; page erase granularity minimizes wear on frequently updated metadata sectors. |
Use Scenario: ANSI C12.22-compliant smart meter retaining firmware, tariff tables, and tamper logs across 15+ year service life. IC Role / Device Role / Timing Role: Block erase (50H opcode) clears 8-page segments during firmware rollback; SPI Mode 3 compatibility ensures robust noise immunity in high-EMI environments. Use Value: 13 MHz SCK supports fast secure firmware download; hardware write protect prevents unauthorized modification of regulatory-critical code sections. |
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-CI | Successor with enhanced reliability, improved tEP (erase+program) spec, and extended temperature support - same pinout and command set | Required for new designs per Microchip recommendation; backward compatible but not drop-in for qualification-critical legacy systems | Select AT45DB161B-CI for new projects; verify endurance and data retention specs match application lifetime requirements |
| W25Q16JVSSIQ | 16 Mbit Quad SPI NOR Flash; supports standard SPI + QPI modes; no integrated SRAM buffers; faster 100 MHz QPI read speed but lacks concurrent load/program capability | Better suited for execute-in-place (XIP) code storage; unsuitable for streaming write workloads requiring dual-buffer overlap | Choose W25Q16JVSSIQ only if application prioritizes read bandwidth over write concurrency and does not require buffer-assisted reprogramming |
Compared with AT45DB161B-CI, the AT45DB161-CI offers identical functionality but lacks updated reliability characterization; versus W25Q16JVSSIQ, it trades raw read speed for deterministic write pipelining - making it superior for firmware update, audio capture, and real-time logging where write latency and concurrency matter most.
Availability
AT45DB161-CI is available at Aetrix Electronics and suitable for digital voice recorders, industrial firmware update modules, medical data loggers, smart meters, and embedded telemetry systems requiring stable component supply and long-term obsolescence management.
Supply support for AT45DB161-CI 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 emphasis on reliability, longevity, and industrial-grade performance.
The AT45DB161-CI belongs to Microchip's DataFlash® family - designed specifically for embedded systems needing high-density serial Flash with integrated SRAM buffers to simplify in-system reprogramming and reduce host processor overhead.
FAQ
What is the maximum clock frequency supported by the AT45DB161-CI?
The AT45DB161-CI supports a maximum serial clock (SCK) frequency of 13 MHz, as specified in its AC characteristics table. This enables high-speed data transfer during read and write operations while maintaining signal integrity in compact PCB layouts. The device remains fully functional across the entire 2.7V–3.6V supply range at this clock rate, and timing parameters such as tSU (10 ns) and tV (30 ns) are guaranteed under these conditions. AT45DB161-CI operates in SPI Modes 0 and 3, allowing flexible integration with diverse host controllers.
Does the AT45DB161-CI require a high-voltage programming supply?
No, the AT45DB161-CI does not require a high-voltage programming supply. It performs all program and erase operations using only the standard 2.7V–3.6V VCC supply, eliminating the need for charge pumps or external voltage generators. This simplifies power design and enhances reliability in battery-operated and low-noise applications. All internal timing is self-controlled, and no external high-voltage pulses or special sequencing are needed - the AT45DB161-CI executes full page reprogramming (erase + program) in a single command cycle.
How does the dual-buffer architecture of the AT45DB161-CI improve system performance?
The AT45DB161-CI integrates two independent 528-byte SRAM buffers that operate asynchronously from the main Flash array. While one buffer receives new data via the SI pin, the other can simultaneously transfer or program data to Flash - enabling true pipelined operation. This eliminates host wait states during page programming (7 ms typical), reducing effective write latency by over 98% in streaming applications. The AT45DB161-CI leverages this architecture for seamless digital voice recording, firmware updates, and real-time data logging without external RAM buffering.
What is the function of the RDY/BUSY pin on the AT45DB161-CI?
The RDY/BUSY pin on the AT45DB161-CI is an open-drain output that signals device readiness: it is pulled low during any self-timed operation (e.g., page program, block erase, buffer transfer) and returns high when complete. This allows the host to poll bit 7 of the status register or monitor the pin directly for deterministic timing control. Unlike software-only polling, RDY/BUSY provides hardware-level synchronization - critical for time-sensitive applications like audio capture or firmware validation. The AT45DB161-CI guarantees this signal meets tCSB (200 ns) timing relative to CS activation.
Can the AT45DB161-CI be used in industrial temperature environments?
Yes, the AT45DB161-CI is qualified for industrial temperature operation from –40°C to +85°C, as explicitly stated in its DC operating range specification. It maintains full functionality across this range, including guaranteed 13 MHz SCK operation, 7 ms page program time, and 3 µA standby current. The device incorporates internal power-on reset circuitry and features CMOS/TTL-compatible I/Os with defined VIH/VIL thresholds, ensuring robust performance in harsh environments. AT45DB161-CI is widely deployed in programmable logic controllers, smart meters, and industrial HMI systems requiring extended thermal reliability.
AT45DB161-CI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 24-LBGA, CSPBGA
- 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:
- 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:
- 24-CBGA (7x9.5)
AT45DB161-CI FAQ
1.How can I place an order for AT45DB161-CI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB161-CI 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-CI reliable?
The price and inventory of AT45DB161-CI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB161-CI is usually 5 days.
3.What payment methods are accepted for AT45DB161-CI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB161-CI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB161-CI?
AT45DB161-CI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB161-CI 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-CI?
For technical support, including AT45DB161-CI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB161-CI requirements.
6.How does Aetrix verify that AT45DB161-CI is sourced from the original manufacturer or authorized distributors?
All AT45DB161-CI 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-CI meets industry standards.
7.What is the process for return or replacement of AT45DB161-CI?
All AT45DB161-CI units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB161-CI, 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-CI part is unused and in its original packaging.
Return procedure for AT45DB161-CI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT45DB161-CI Tags
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M24C02-FMC6TG
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