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Microchip Technology AT45DB041B-SI
- Part No.:
- AT45DB041B-SI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT45DB041B-SI.pdf
- Description:
- IC FLASH 4MBIT SPI 20MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,317
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Product details
Overview
AT45DB041B-SI 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, hardware write protection, and 20 MHz max clock frequency. It enables concurrent data buffering and flash reprogramming for code shadowing and firmware update applications in embedded systems.
For engineers reviewing the AT45DB041B-SI datasheet, AT45DB041B-SI pinout, AT45DB041B-SI application, or AT45DB041B-SI equivalent, key selection considerations include its 2.5–3.6 V single-supply operation, 5.0 V-tolerant control pins (CS, SCK, SI, WP, RESET), continuous array read capability, and self-timed page program/erase functions without high-voltage programming.
Technical Context
The AT45DB041B-SI implements a serial flash architecture with two independent 264-byte SRAM buffers that operate asynchronously to the main memory array, enabling simultaneous data reception into one buffer while reprogramming a page in flash. Its SPI interface supports Mode 0 and Mode 3, with all instructions initiated by CS low and MSB-first data transfer.
Internal operations-including page erase, buffer-to-flash program with built-in erase, and auto page rewrite-are fully self-timed and reported via the RDY/BUSY pin and Status Register bit 7. The device uses a three-level memory hierarchy (sector/block/page) and supports block-erase (8-page units) and individual page-erase for flexible data management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4,325,376 bits (2048 pages × 264 bytes), enabling compact storage of firmware images or voice/audio segments |
| Supply Voltage | 2.5–3.6 V or 2.7–3.6 V single supply - eliminates need for charge pumps or external voltage translators |
| Max Clock Frequency | 20 MHz - supports high-throughput serial data streaming up to ~2.5 MB/s in continuous read mode |
| Active Read Current | 4 mA typical - enables low-power operation in battery-backed or energy-constrained embedded systems |
| Standby Current | 2 µA typical - allows ultra-low-power retention during system sleep states |
| Input Voltage Tolerance | 5.0 V-tolerant on SI, SCK, CS, RESET, WP - simplifies level-shifting design when interfacing with 5 V microcontrollers |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade reliability in harsh environments |
Pinout & Package
AT45DB041B-SI is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with gull-wing leads, RoHS-compliant and halide-free. Pin 1 is marked with a dot or notch; package dimensions conform to JEDEC MS-012AA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must be held low for instruction initiation and remains low throughout command execution |
| SCK | Serial Clock | Input-only clock; data latched on rising edge (SI), output shifted on falling edge (SO); supports SPI Modes 0 and 3 |
| SI | Serial Input | Input-only data line for opcodes, addresses, and buffer data; MSB-first protocol |
| SO | Serial Output | Output-only data line for read data and status register; tri-stated when CS is high |
| WP | Hardware Write Protect | Active-low pin protecting first 256 pages; driven high externally if unused to prevent accidental lockout |
| RESET | Chip Reset | Active-low asynchronous reset; terminates ongoing operations and returns state machine to idle |
| RDY/BUSY | Open-drain Ready/Busy Indicator | Drives low during internal self-timed operations (e.g., program, erase, compare); requires 1 kΩ external pull-up |
| VCC / GND | Power Supply / Ground | Single 2.5–3.6 V supply; decoupling capacitor (0.1 µF) recommended near VCC pin |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM Buffers | Two independent 264-byte buffers allow pipelined operation: receive new data into one buffer while programming flash from the other |
| Continuous Array Read | Enables seamless code shadowing from flash to RAM without address reinitialization across page boundaries |
| Self-Timed Page Program | No external timing control needed; erase-and-program completed internally in ≤20 ms (tEP) |
| Hardware Page Protection | WP pin disables reprogramming of first 256 pages (132 KB), safeguarding boot code or calibration data |
| Flexible Erase Granularity | Supports both page-erase (single 264-byte unit) and block-erase (8 pages = 2112 bytes) for optimized wear leveling |
Applications
| Firmware Storage & Update | Audio Data Buffering |
|---|---|
Use Scenario: Storing and updating bootloader and application firmware in resource-constrained microcontroller-based devices. IC Role / Device Role / Timing Role: Nonvolatile storage medium accessed via SPI; provides atomic page reprogramming for safe over-the-air updates. Use Value: Dual-buffer architecture enables background firmware download while maintaining active execution from flash, minimizing system downtime. | Use Scenario: Recording and playback of voice prompts or audio clips in industrial HMI or medical alert systems. IC Role / Device Role / Timing Role: Serial flash memory with continuous read capability; used for sequential audio stream storage and retrieval. Use Value: 20 MHz clock support and no inter-page delay in continuous read mode ensure uninterrupted audio playback at CD-quality sampling rates. |
| Embedded Code Shadowing | Calibration Data Archiving |
Use Scenario: Copying critical application code from flash to faster SRAM at startup in DSP or real-time control systems. IC Role / Device Role / Timing Role: High-density serial memory providing fast, contiguous read access across full 4 Mbit array. Use Value: Continuous Array Read command eliminates address overhead, achieving sustained throughput ideal for shadowing large code sections. | Use Scenario: Storing sensor calibration coefficients, manufacturing test results, or field-service logs in automotive ECUs or test equipment. IC Role / Device Role / Timing Role: Reliable nonvolatile storage with hardware write protection on designated pages. Use Value: WP pin prevents accidental overwrite of factory-set calibration data, ensuring long-term measurement traceability and regulatory compliance. |
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 endurance (100k vs. 10k program/erase cycles), same pinout and command set | Preferred for new designs requiring longer field life or frequent firmware updates | Select AT45DB041D-SU where extended reliability and lifecycle support are required; AT45DB041B-SI remains valid for legacy compatibility |
| W25Q40EWUXIE | 4 Mbit Quad SPI flash (QSPI), 104 MHz max clock, no internal buffers, different command set and timing | Better suited for high-speed XIP or multi-I/O bandwidth-critical applications, not direct functional replacement | Choose W25Q40EWUXIE only if QSPI interface and higher clock rate are mandatory; requires firmware and driver changes |
Compared with AT45DB041D-SU, the AT45DB041B-SI offers proven stability but lower endurance; compared with W25Q40EWUXIE, it delivers unique dual-buffer concurrency and simpler SPI-3-wire interface at the cost of lower peak bandwidth and no quad-mode support.
Availability
AT45DB041B-SI is available at Aetrix Electronics and suitable for firmware storage, audio buffering, code shadowing, and calibration archiving requiring stable component supply and industrial temperature operation.
Supply support for AT45DB041B-SI 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 focus on reliability, security, and ease of design.
The AT45DB041B-SI belongs to Microchip's DataFlash® family, engineered specifically for embedded systems needing efficient serial flash with integrated buffering to simplify firmware update, audio playback, and data logging architectures.
FAQ
What is the memory organization of the AT45DB041B-SI?
The AT45DB041B-SI contains 4,325,376 bits of flash memory organized as 2048 pages of 264 bytes each (256 data + 8 overhead bytes). It also integrates two independent 264-byte SRAM data buffers. This structure supports page-level programming, block-erase (8 pages), and continuous array read without boundary delays - all accessible via standard SPI commands. The AT45DB041B-SI uses a hierarchical sector/block/page architecture for flexible data management.
Does the AT45DB041B-SI require high-voltage programming?
No, the AT45DB041B-SI does not require high-voltage programming. It operates from a single 2.5–3.6 V supply for both read and program/erase operations. All internal programming cycles - including page program with built-in erase and block erase - are self-timed and executed using standard logic-level signals. The AT45DB041B-SI eliminates external charge pumps or voltage translators, simplifying power design and reducing BOM count.
How does the dual-buffer architecture of the AT45DB041B-SI improve system performance?
The AT45DB041B-SI's two 264-byte SRAM buffers enable true concurrency: while one buffer streams incoming data from the host, the other can simultaneously program a page in flash memory. This eliminates wait states during firmware updates or audio recording. The AT45DB041B-SI leverages this for features like Auto Page Rewrite and Main Memory Page to Buffer Transfer - critical for robust field-upgrade and data-integrity workflows.
What is the function of the RDY/BUSY pin on the AT45DB041B-SI?
The RDY/BUSY pin on the AT45DB041B-SI is an open-drain output that drives low during any self-timed internal operation - including page program, block erase, buffer-to-memory transfer, or compare - and returns high when complete. It provides hardware-ready signaling without polling the status register. The AT45DB041B-SI requires a 1 kΩ external pull-up resistor on this pin to ensure proper logic levels and reliable timing coordination in real-time systems.
Can the AT45DB041B-SI be used with 5 V microcontrollers?
Yes, the AT45DB041B-SI supports 5.0 V-tolerant inputs on SI, SCK, CS, RESET, and WP pins, allowing direct connection to 5 V microcontrollers without level shifters. Its core logic and I/O operate from 2.5–3.6 V (VCC), but input pins accept up to 5.5 V. This simplifies mixed-voltage system design. The AT45DB041B-SI maintains full functionality and timing compliance under these conditions, provided VCC remains within specification.
AT45DB041B-SI 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:
- 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:
- 8-SOIC
AT45DB041B-SI FAQ
1.How can I place an order for AT45DB041B-SI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB041B-SI 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-SI reliable?
The price and inventory of AT45DB041B-SI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB041B-SI is usually 5 days.
3.What payment methods are accepted for AT45DB041B-SI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB041B-SI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB041B-SI?
AT45DB041B-SI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB041B-SI 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-SI?
For technical support, including AT45DB041B-SI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB041B-SI requirements.
6.How does Aetrix verify that AT45DB041B-SI is sourced from the original manufacturer or authorized distributors?
All AT45DB041B-SI 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-SI meets industry standards.
7.What is the process for return or replacement of AT45DB041B-SI?
All AT45DB041B-SI units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB041B-SI, 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-SI part is unused and in its original packaging.
Return procedure for AT45DB041B-SI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT45DB041B-SI Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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24LC01BT-I/OT
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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AT24C08C-STUM-T
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