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Microchip Technology AT45DB041B-RI-2.5
- Part No.:
- AT45DB041B-RI-2.5
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.342", 8.69mm Width)
- Datasheet:
-
AT45DB041B-RI-2.5.pdf
- Description:
- IC FLASH 4MBIT SPI 15MHZ 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,088
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Product details
Overview
AT45DB041B-RI-2.5 from Microchip Technology (formerly Atmel) is a 4-Mbit serial DataFlash memory IC with SPI interface, organized as 2048 pages × 264 bytes (4,325,376 bits), supporting single-cycle reprogram (erase + program), dual 264-byte SRAM buffers, and continuous array read for code shadowing in embedded microcontroller systems.
For engineers reviewing the AT45DB041B-RI-2.5 datasheet, AT45DB041B-RI-2.5 pinout, AT45DB041B-RI-2.5 application, or AT45DB041B-RI-2.5 equivalent, key selection considerations include 2.5V–3.6V supply compatibility, 20 MHz max SPI clock, hardware write protection (WP), RDY/BUSY open-drain status signaling, and 8-pin SOIC package with 5.0V-tolerant control inputs.
Technical Context
The AT45DB041B-RI-2.5 implements a dedicated SPI serial interface compliant with modes 0 and 3, using a three-wire protocol (CS, SCK, SI/SO) to eliminate parallel address/data buses. Its architecture separates main Flash memory (2048 × 264 B) from two independent 264-byte SRAM buffers, enabling concurrent buffer loading and Flash page programming.
All erase and program operations-including page erase, block erase (8-page), buffer-to-Flash program with/without built-in erase, and auto page rewrite-are internally self-timed and require no external high-voltage programming signals. The RDY/BUSY pin provides real-time status feedback during these operations, while the WP pin enables hardware-level protection of the first 256 pages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (4,325,376 bits), organized as 2048 pages × 264 bytes - supports byte-alterable EEPROM emulation via Read-Modify-Write |
| Supply Voltage | 2.5V–3.6V or 2.7V–3.6V - single-supply operation eliminates need for charge pumps or auxiliary rails |
| Max SPI Clock | 20 MHz - enables high-throughput data streaming for firmware updates and audio buffering |
| Active Read Current | 4 mA typical - low power consumption suitable for battery-backed or energy-constrained systems |
| Standby Current | 2 µA typical - enables ultra-low-power retention during system sleep modes |
| Input Tolerance | 5.0V-tolerant on SI, SCK, CS, RESET, WP - simplifies level-shifting in mixed-voltage designs |
| Operating Temp | Commercial (0°C to +70°C) and Industrial (–40°C to +85°C) ranges - validated for industrial control and automotive accessory applications |
Pinout & Package
AT45DB041B-RI-2.5 is supplied in an 8-pin Small Outline Integrated Circuit (SOIC) package with 150 mil body width, RoHS-compliant and halide-free. Pinout conforms to standard SPI serial flash layout with dedicated RDY/BUSY and hardware write protect functionality.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; falling edge initiates command sequence; high state tri-states SO output |
| SCK | Serial Clock | Input-only clock; data latched on rising edge, output shifted on falling edge; supports SPI modes 0 and 3 |
| SI | Serial Input | Input-only data line for opcodes, addresses, and buffer writes; 5.0V-tolerant |
| SO | Serial Output | Output-only data line for read data and status register; high-impedance when CS is high |
| WP | Hardware Write Protect | Active-low pin disabling program/erase of first 256 pages; 5.0V-tolerant; must be pulled high if unused |
| RESET | Chip Reset | Active-low asynchronous reset; terminates ongoing operation and returns state machine to idle; 5.0V-tolerant |
| RDY/BUSY | Ready/Busy Indicator | Open-drain output pulled low during self-timed operations (program/erase/transfer); requires external 1 kΩ pull-up |
| VCC / GND | Power Supply | Single 2.5V–3.6V supply; decoupling capacitor required near VCC pin for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM Buffers | Two independent 264-byte buffers enable simultaneous data reception and Flash reprogramming - critical for seamless firmware updates |
| Continuous Array Read | Supports uninterrupted sequential read across entire memory without address re-entry - ideal for boot code shadowing and audio playback |
| Page-Level Erase/Program | 2048 individually erasable pages allow fine-grained data management without full-chip erase delays |
| Self-Timed Operations | All program and erase cycles complete autonomously with no external timing control - reduces host MCU overhead and firmware complexity |
| Hardware Page Protection | WP pin blocks modification of first 256 pages - prevents accidental corruption of bootloader or calibration data |
Applications
| Firmware Storage | Audio Data Buffering |
|---|---|
Use Scenario: Storing and updating microcontroller firmware images in field-deployed IoT gateways. IC Role / Device Role / Timing Role: Nonvolatile storage medium accessed via SPI for secure, in-system firmware upgrades. Use Value: Dual-buffer architecture allows new firmware to be loaded into one buffer while current code executes from Flash - zero-downtime updates. | Use Scenario: Capturing and playing back voice prompts or alarm tones in smart home controllers. IC Role / Device Role / Timing Role: High-reliability serial Flash providing continuous read capability for real-time audio streaming. Use Value: Continuous Array Read mode delivers uninterrupted 20 MHz data flow - eliminates gaps or stutter in playback. |
| Industrial Sensor Calibration Data | Embedded Configuration Storage |
Use Scenario: Retaining factory-calibrated sensor coefficients and temperature compensation tables in PLC modules. IC Role / Device Role / Timing Role: EEPROM-emulation-capable Flash used for infrequent but critical parameter writes. Use Value: Page-level erase and Read-Modify-Write support enable bit/byte-level updates without full-page overwrites - extends endurance life. | Use Scenario: Storing user-configurable settings (network IDs, thresholds, display preferences) in medical diagnostic devices. IC Role / Device Role / Timing Role: Low-power nonvolatile memory accessed during boot and runtime for persistent configuration recall. Use Value: 2 µA standby current minimizes battery drain in portable units; 2.5V operation ensures compatibility with Li-ion battery discharge profiles. |
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-RI | Successor device with enhanced reliability, extended endurance (100K program/erase cycles vs. 10K), and updated EOL status; identical pinout and command set | Recommended for new designs requiring longer product lifecycle and higher write endurance | Select AT45DB041D-RI when long-term supply assurance and improved data retention are required; AT45DB041B-RI-2.5 remains valid for legacy repair or cost-sensitive volume production |
| W25Q40EWUXIE | 4 Mbit Quad SPI Flash with DTR support, 104 MHz max clock, and 100K program/erase cycles; requires different command set and lacks dual SRAM buffers | Better suited for high-speed code XIP or multi-I/O throughput; not drop-in compatible due to bufferless architecture and QSPI interface | Choose W25Q40EWUXIE only when migrating to Quad SPI infrastructure and accepting firmware driver changes; not a functional substitute for AT45DB041B-RI-2.5's buffer-assisted streaming workflow |
Compared with AT45DB041D-RI, the AT45DB041B-RI-2.5 offers proven field reliability but lower endurance and no future supply guarantee; versus W25Q40EWUXIE, it delivers unique dual-buffer concurrency at lower clock speeds but lacks quad I/O performance and modern process node advantages.
Availability
AT45DB041B-RI-2.5 is available at Aetrix Electronics and suitable for firmware storage, audio buffering, sensor calibration data retention, and embedded configuration storage requiring stable component supply across industrial and commercial product lifecycles.
Supply support for AT45DB041B-RI-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 components, and memory solutions for industrial, automotive, and consumer applications.
The AT45DB041B-RI-2.5 belongs to Microchip's legacy DataFlash family, designed specifically for SPI-based embedded systems needing concurrent data buffering and Flash reprogramming - targeting cost-sensitive, low-pin-count applications where EEPROM emulation and code shadowing are essential.
FAQ
What voltage range does the AT45DB041B-RI-2.5 support for reliable operation?
The AT45DB041B-RI-2.5 operates reliably across two supply ranges: 2.5V to 3.6V and 2.7V to 3.6V. This dual-range support allows direct integration with 2.5V logic systems and backward compatibility with 3.3V platforms. All program, read, and erase functions are fully specified within these ranges, and no external voltage translation is needed for standard SPI host interfaces. The AT45DB041B-RI-2.5 maintains full timing compliance and data integrity across the entire operating window.
Does the AT45DB041B-RI-2.5 support true byte-level writes like EEPROM?
The AT45DB041B-RI-2.5 does not support native byte-level writes, but enables EEPROM emulation through a self-contained three-step Read-Modify-Write operation using its dual SRAM buffers. This allows individual byte or bit alterations within a 264-byte page without requiring full-page erasure. The AT45DB041B-RI-2.5 implements this entirely in hardware - no external controller logic is needed beyond issuing the defined command sequence per the datasheet.
How does the RDY/BUSY pin function during AT45DB041B-RI-2.5 operations?
The RDY/BUSY pin on the AT45DB041B-RI-2.5 is an open-drain output that pulls low during all internally self-timed operations - including page/block erase, buffer-to-Flash programming, page transfers, and compare operations. It remains high otherwise, indicating readiness to accept new commands. An external 1 kΩ pull-up resistor is required. The AT45DB041B-RI-2.5 also reflects this status in bit 7 of its status register, enabling polling as an alternative to pin monitoring.
Can the AT45DB041B-RI-2.5 be used in place of standard SPI NOR Flash devices?
The AT45DB041B-RI-2.5 is not a drop-in replacement for standard SPI NOR Flash due to architectural differences: it uses page-based addressing (2048 × 264 B), lacks uniform sector erase, and relies on dual buffers for streaming workflows. While command opcodes overlap partially, features like Continuous Array Read and Main Memory Page to Buffer Transfer are unique to the DataFlash architecture. Direct substitution requires firmware adaptation - the AT45DB041B-RI-2.5 excels where concurrent buffering matters more than raw NOR compatibility.
What is the purpose of the WP pin on the AT45DB041B-RI-2.5, and how is it implemented?
The WP (Write Protect) pin on the AT45DB041B-RI-2.5 is an active-low hardware feature that disables program and erase operations on the first 256 pages (pages 0–255) of main memory when held low. This protects critical firmware or calibration data from accidental overwrite. The AT45DB041B-RI-2.5 requires the WP pin to be externally pulled high if unused; leaving it floating may cause undefined behavior. Unlike software lock bits, WP operates independently of command execution and cannot be overridden by SPI instructions.
AT45DB041B-RI-2.5 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:
- 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
AT45DB041B-RI-2.5 FAQ
1.How can I place an order for AT45DB041B-RI-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB041B-RI-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-RI-2.5 reliable?
The price and inventory of AT45DB041B-RI-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-RI-2.5 is usually 5 days.
3.What payment methods are accepted for AT45DB041B-RI-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB041B-RI-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB041B-RI-2.5?
AT45DB041B-RI-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB041B-RI-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-RI-2.5?
For technical support, including AT45DB041B-RI-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB041B-RI-2.5 requirements.
6.How does Aetrix verify that AT45DB041B-RI-2.5 is sourced from the original manufacturer or authorized distributors?
All AT45DB041B-RI-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-RI-2.5 meets industry standards.
7.What is the process for return or replacement of AT45DB041B-RI-2.5?
All AT45DB041B-RI-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB041B-RI-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-RI-2.5 part is unused and in its original packaging.
Return procedure for AT45DB041B-RI-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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