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Microchip Technology AT45DB041B-SC-2.5
- Part No.:
- AT45DB041B-SC-2.5
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT45DB041B-SC-2.5.pdf
- Description:
- IC FLASH 4MBIT SPI 15MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,146
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Product details
Overview
AT45DB041B-SC-2.5 from Microchip Technology (formerly Atmel) is a 4-Mbit serial DataFlash memory IC with SPI interface, organized as 2048 pages × 264 bytes, featuring dual 264-byte SRAM buffers and single 2.5V–3.6V supply operation. It enables concurrent data buffering and flash reprogramming for embedded code shadowing, firmware storage, and voice/image logging in space-constrained systems.
For engineers reviewing the AT45DB041B-SC-2.5 datasheet, AT45DB041B-SC-2.5 pinout, AT45DB041B-SC-2.5 application, or AT45DB041B-SC-2.5 equivalent, key selection criteria include its 20 MHz SPI clock support, hardware write protection (WP), RDY/BUSY open-drain status signaling, 5.0V-tolerant control inputs, and continuous array read capability for seamless boot code streaming.
Technical Context
The AT45DB041B-SC-2.5 implements a page-structured Flash architecture with two independent 264-byte SRAM buffers, enabling simultaneous receive-to-buffer and buffer-to-flash programming-eliminating idle time during firmware updates. Its SPI interface supports Mode 0 and Mode 3, with all commands initiated via CS low followed by 8-bit opcodes and address sequences.
Internal self-timed operations-including page erase, block erase (8-page units), and buffer-to-main-memory program with built-in erase-remove external timing dependencies. The RDY/BUSY pin reflects internal state machine activity, allowing host polling without command overhead, while the status register provides real-time ready/busy, compare result, and density identification bits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4,325,376 bits (2048 × 264-byte pages) - supports full firmware image storage in compact footprint |
| Supply Voltage | 2.5V–3.6V - compatible with modern low-voltage microcontrollers without level-shifting |
| Max SPI Clock | 20 MHz - enables fast sequential reads (e.g., code shadowing at ~2.5 MB/s raw throughput) |
| Active Read Current | 4 mA typical - minimizes power draw during active execution or streaming |
| Standby Current | 2 µA typical - suitable for battery-backed or energy-sensitive applications |
| Write Protection | Hardware WP pin - prevents accidental overwrite of first 256 pages (64 KB) during field updates |
| Input Tolerance | 5.0V-tolerant SI, SCK, CS, RESET, WP - simplifies interface to mixed-voltage systems |
Pinout & Package
AT45DB041B-SC-2.5 is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with 150 mil body width, RoHS-compliant and halide-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; falling edge initiates command sequence; high-impedance SO when deasserted |
| SCK | Serial Clock | Input-only; controls data shift timing; rising edge clocks SI, falling edge clocks SO |
| SI | Serial Input | Input-only; receives opcodes, addresses, and data; MSB-first protocol |
| SO | Serial Output | Output-only; returns read data and status register bits; tri-stated when CS high |
| WP | Write Protect | Active-low hardware lock for first 256 pages; eliminates need for software-based protection schemes |
| RESET | Chip Reset | Active-low asynchronous reset; terminates ongoing operation and clears internal state machine |
| RDY/BUSY | Ready/Busy Indicator | Open-drain output; pulled low during self-timed operations (erase, program, transfer); enables efficient polling |
| VCC / GND | Power Supply | Single 2.5V–3.6V supply; 2 µA standby current enables ultra-low-power retention |
Key Features
| Feature | Design Value |
|---|---|
| Dual 264-byte SRAM buffers | Enables pipelined operation: receive new data into one buffer while programming flash from the other - critical for real-time logging |
| Continuous Array Read | Supports uninterrupted code shadowing across page boundaries with no latency at wraparound - ideal for XIP (execute-in-place) boot loaders |
| Page + Block Erase | Flexible granularity: erase individual 264-byte pages or 8-page (2112-byte) blocks - optimizes wear leveling and update efficiency |
| Self-timed Program/Erase | No external timing circuitry required; internal logic manages tEP (max 20 ms), tP (max 10 ms), and tPE (max 15 ms) - simplifies host firmware |
| Hardware Data Protection | WP pin + status-register-controlled locking - prevents corruption during brown-out or reset events without software intervention |
Applications
| Industrial Firmware Storage | Embedded Voice Logging |
|---|---|
Use Scenario: Storing and updating firmware images in programmable logic controllers (PLCs) and motor drives where field upgrades must occur without system downtime. IC Role / Device Role / Timing Role: Nonvolatile storage for boot code and application binaries; serves as primary SPI flash target for bootloader-initiated DFU (device firmware upgrade). Use Value: Dual-buffer architecture allows background download to buffer while executing from flash, enabling zero-downtime updates verified via Main Memory Page to Buffer Compare. | Use Scenario: Capturing and replaying voice prompts or alarm audio in security panels and building automation systems with limited PCB area. IC Role / Device Role / Timing Role: Sequential-access audio buffer with continuous read mode; interfaces directly to audio DAC or codec over SPI. Use Value: 20 MHz clock support enables real-time streaming at CD-quality (44.1 kHz × 16-bit ≈ 882 kbps), while 2 µA standby current preserves battery life in always-on monitoring nodes. |
| Medical Sensor Data Logger | IoT Edge Configuration Store |
Use Scenario: Recording timestamped physiological sensor readings (ECG, SpO₂) in portable diagnostic devices requiring long-term data retention and tamper resistance. IC Role / Device Role / Timing Role: High-reliability nonvolatile memory with hardware write protection; stores encrypted sensor logs in page-erased sectors to meet IEC 62304 data integrity requirements. Use Value: Page-level erase and 5.0V-tolerant WP/RESET pins ensure robust operation during voltage transients common in battery-powered medical equipment. | Use Scenario: Holding device-specific configuration parameters (Wi-Fi credentials, calibration offsets, OTA update policies) in smart meters and connected thermostats. IC Role / Device Role / Timing Role: Secure parameter store accessed only during boot or network provisioning; isolated from main application flash to prevent corruption. Use Value: Hardware WP pin protects first 256 pages containing critical config data, while RDY/BUSY pin enables deterministic timing for secure parameter writes during power-fail scenarios. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT45DB041D-SU | Successor generation with enhanced reliability, same pinout and command set; supports 2.3V–3.6V supply | Identical use cases but qualified for extended temperature range (–40°C to +85°C) and higher endurance (100K erase/write cycles vs. 10K) | Select for new designs requiring longer product lifecycle or industrial-grade reliability |
| W25Q40EWUXIE | 4-Mbit Quad SPI NOR flash; supports QPI/DTR modes; 1.65V–1.95V/2.7V–3.6V dual supply; no SRAM buffers | Lacks concurrent buffer+flash operation; requires software-managed erase before write; better suited for execute-in-place code than streaming data | Choose when higher clock speeds (>104 MHz QPI) or smaller package (USON-8) are prioritized over pipelined data flow |
Compared with AT45DB041D-SU, the AT45DB041B-SC-2.5 offers proven field reliability but lower endurance and narrower voltage range; versus W25Q40EWUXIE, it delivers true concurrent read-while-write capability at lower SPI clock rates, making it superior for real-time data acquisition where latency predictability matters more than peak bandwidth.
Availability
AT45DB041B-SC-2.5 is available at Aetrix Electronics and suitable for industrial firmware storage, embedded voice logging, medical sensor data logging, and IoT edge configuration storage requiring stable component supply and long-term sourcing continuity.
Supply support for AT45DB041B-SC-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 is a global semiconductor company delivering microcontrollers, analog, FPGA, and memory solutions with emphasis on reliability, longevity, and embedded system integration.
The AT45DB041B-SC-2.5 belongs to Microchip's legacy DataFlash family, designed specifically for applications needing high-density serial flash with integrated SRAM buffers to enable real-time data streaming and in-system reprogrammability without external RAM.
FAQ
What is the maximum clock frequency supported by the AT45DB041B-SC-2.5?
AT45DB041B-SC-2.5 supports a maximum SPI clock frequency of 20 MHz, validated across its full operating voltage range (2.5V–3.6V) and commercial temperature range (0°C to +70°C). This enables high-throughput continuous array reads and fast buffer transfers, with timing margins maintained per the AC characteristics table in the official datasheet (3443D–DFLSH–2/08).
Does the AT45DB041B-SC-2.5 require high-voltage programming signals?
No, the AT45DB041B-SC-2.5 does not require high-voltage programming signals. All program and erase operations are performed using only the standard 2.5V–3.6V supply rail. Internal charge pumps generate necessary voltages, eliminating the need for external VPP pins or voltage translators - a key advantage for low-complexity embedded designs.
How does the dual-buffer architecture of the AT45DB041B-SC-2.5 improve system performance?
The AT45DB041B-SC-2.5 uses two independent 264-byte SRAM buffers to enable overlapping operations: while one buffer streams data to the Flash array, the other simultaneously accepts new data from the host. This pipelining reduces effective write latency by up to 100% compared to single-buffer flash, critical for real-time data loggers and firmware updaters where host CPU cannot stall.
Can the AT45DB041B-SC-2.5 be used in place of standard SPI NOR flash?
Yes, the AT45DB041B-SC-2.5 is SPI-compatible and supports standard opcodes for read, write, and erase, but differs fundamentally in architecture: it uses page-organized Flash with SRAM buffers rather than uniform-sector NOR. It excels in streaming and partial-page updates but lacks random-access byte addressing. Use it where sequential access and concurrent buffering matter more than direct XIP execution.
What is the purpose of the RDY/BUSY pin on the AT45DB041B-SC-2.5?
The RDY/BUSY pin on the AT45DB041B-SC-2.5 is an open-drain output that goes low during any self-timed operation - including page program, block erase, buffer transfer, or compare. It allows the host microcontroller to poll status without reading the status register, reducing SPI traffic and simplifying timing-critical firmware. An external 1 kΩ pull-up resistor is required for proper operation.
AT45DB041B-SC-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 4Mbit
- Memory Organization:
- 264 Bytes x 2048 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:
- 8-SOIC
AT45DB041B-SC-2.5 FAQ
1.How can I place an order for AT45DB041B-SC-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB041B-SC-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 AT45DB041B-SC-2.5 reliable?
The price and inventory of AT45DB041B-SC-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 AT45DB041B-SC-2.5 is usually 5 days.
3.What payment methods are accepted for AT45DB041B-SC-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB041B-SC-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB041B-SC-2.5?
AT45DB041B-SC-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB041B-SC-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 AT45DB041B-SC-2.5?
For technical support, including AT45DB041B-SC-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB041B-SC-2.5 requirements.
6.How does Aetrix verify that AT45DB041B-SC-2.5 is sourced from the original manufacturer or authorized distributors?
All AT45DB041B-SC-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 AT45DB041B-SC-2.5 meets industry standards.
7.What is the process for return or replacement of AT45DB041B-SC-2.5?
All AT45DB041B-SC-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB041B-SC-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 AT45DB041B-SC-2.5 part is unused and in its original packaging.
Return procedure for AT45DB041B-SC-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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