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Microchip Technology AT45DB041B-CI-2.5
- Part No.:
- AT45DB041B-CI-2.5
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 14-LBGA, CSPBGA
- Datasheet:
-
AT45DB041B-CI-2.5.pdf
- Description:
- IC FLASH 4MBIT SPI 15MHZ 14CBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,770
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Product details
Overview
AT45DB041B-CI-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, 20 MHz max clock, and single 2.5V–3.6V supply. It enables concurrent data buffering and flash reprogramming for embedded code shadowing and firmware update applications.
For engineers reviewing the AT45DB041B-CI-2.5 datasheet, AT45DB041B-CI-2.5 pinout, AT45DB041B-CI-2.5 application, or AT45DB041B-CI-2.5 equivalent, key selection considerations include page-level erase/program timing, buffer-to-memory transfer capability, RDY/BUSY open-drain signaling, 5.0V-tolerant control pins, and industrial temperature support (−40°C to +85°C).
Technical Context
The AT45DB041B-CI-2.5 implements a dedicated SPI serial interface supporting Mode 0 and Mode 3, with all instructions initiated by CS low and MSB-first data transfer. Its architecture separates main memory (2048 × 264 B) from two independent SRAM buffers (264 B each), enabling simultaneous receive-and-reprogram operation without CPU intervention.
Internally self-timed operations-including page program with built-in erase (tEP), block erase (tBE), and buffer transfers (tXFR)-are managed by an on-chip state machine. The RDY/BUSY pin reflects Flash array and buffer access contention, while status register bit 7 provides real-time busy indication for synchronous polling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4,325,376 bits (2048 pages × 264 bytes), enabling compact firmware storage with byte-addressable emulation via Read-Modify-Write |
| Supply Voltage | 2.5V–3.6V (single supply); eliminates need for charge pumps or external high-voltage programming circuits |
| Max Clock Frequency | 20 MHz SPI interface; supports high-throughput streaming reads and buffered writes in resource-constrained MCUs |
| Active Read Current | 4 mA typical; reduces power budget impact during boot-time code shadowing or configuration loading |
| Standby Current | 2 µA typical; enables ultra-low-power retention in battery-backed systems and sleep-mode operation |
| Page Erase Time | tPE ≤ 25 ms; allows rapid field updates of individual 264-byte firmware segments without full-sector erasure |
| Buffer Size | Two independent 264-byte SRAM buffers; permits pipelined write-to-buffer + program-from-buffer sequences for zero-gap data streaming |
Pinout & Package
AT45DB041B-CI-2.5 is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with 150 mil body width, 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; initiates instruction decoding on falling edge and terminates operation on rising edge |
| SCK | Serial Clock | Input-only; controls data sampling (SI on rising edge, SO on falling edge); supports SPI Mode 0/3 |
| SI | Serial Input | Input-only; receives opcodes, addresses, and data; 5.0V-tolerant for mixed-voltage system interfacing |
| SO | Serial Output | Output-only; returns read data and status register bits; tri-stated when CS is high |
| WP | Hardware Write Protect | Active-low; locks first 256 pages (64 KiB) against accidental overwrite; 5.0V-tolerant |
| RESET | Chip Reset | Active-low; forces internal state machine into idle; no external pull-up required due to internal POR circuit |
| RDY/BUSY | Ready/Busy Indicator | Open-drain output; pulled low during self-timed operations (erase, program, compare, transfer) |
| VCC / GND | Power Supply | Single 2.5V–3.6V supply; GND referenced; no separate VIO or auxiliary rails needed |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM Buffers | Enables concurrent data reception into one buffer while reprogramming flash from the other-eliminates CPU wait states during firmware updates |
| Continuous Array Read | Supports seamless code shadowing from flash to RAM without address reinitialization across page boundaries or array wraparound |
| Page-Level Reprogramming | Single-cycle erase-and-program per 264-byte page removes need for external erase management logic or sector alignment overhead |
| 5.0V-Tolerant Control Pins | Allows direct connection to 5V microcontrollers or FPGAs without level shifters on CS, SCK, SI, RESET, and WP lines |
| Industrial Temp Range | Rated for −40°C to +85°C operation-validated for use in automotive infotainment head units, industrial HMIs, and outdoor IoT gateways |
Applications
| Code Shadowing | Firmware Over-the-Air (OTA) Updates |
|---|---|
Use Scenario: Bootloader copies executable code from flash to RAM before execution to improve MCU instruction fetch speed. IC Role / Device Role / Timing Role: Nonvolatile storage medium with continuous-read capability and automatic page-wrap addressing. Use Value: Eliminates external parallel NOR flash and associated address/data bus routing; reduces PCB layer count and EMI emissions. | Use Scenario: Remote device receives encrypted firmware image over cellular/Wi-Fi and stores it in flash prior to validation and activation. IC Role / Device Role / Timing Role: Dual-buffered storage node supporting background download while maintaining active application execution. Use Value: Enables atomic firmware swap using buffer-to-page program with built-in erase-no risk of partial corruption during power loss. |
| Configuration & Calibration Data Storage | Audio Voice Prompt Playback |
Use Scenario: Industrial sensor node stores factory calibration coefficients, user preferences, and runtime logs across power cycles. IC Role / Device Role / Timing Role: EEPROM-emulation target via Read-Modify-Write; supports byte-level updates without full-page erasure. Use Value: Extends effective endurance beyond 100k cycles per page using auto-page-rewrite and sector wear leveling in firmware. | Use Scenario: Smart speaker plays localized voice prompts (e.g., "Door Open", "Low Battery") stored as PCM audio in flash. IC Role / Device Role / Timing Role: High-fidelity serial playback device leveraging continuous array read mode at 20 MHz for glitch-free streaming. Use Value: Delivers >1.6 MB/s sustained read throughput-sufficient for 16-bit/44.1 kHz mono audio without DMA bottlenecks. |
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-CU | Successor generation with enhanced reliability, improved tEP (≤20 ms), and extended data retention (20 years vs. 10 years) | Same pinout and command set; supports identical firmware but adds margin for long-life deployments | Select for new designs requiring longer product lifecycle support and tighter program timing |
| W25Q40EWSSIG | Quad SPI (QSPI) capable, 40 MHz max clock, 1.65–1.95V supply; lacks dual SRAM buffers and continuous array read | Higher bandwidth but requires host-side buffering logic; not drop-in compatible for DataFlash-specific commands | Choose when system demands faster random access or lower voltage operation, and firmware can be adapted to standard SPI flash protocols |
Compared with AT45DB041D-CU, the AT45DB041B-CI-2.5 offers proven field reliability but lacks newer endurance and retention specs; versus W25Q40EWSSIG, it delivers deterministic buffer-assisted streaming and simpler command protocol at the cost of peak bandwidth and voltage flexibility.
Availability
AT45DB041B-CI-2.5 is available at Aetrix Electronics and suitable for industrial HMI panels, medical diagnostic peripherals, and automotive telematics modules requiring stable component supply, long-term obsolescence planning, and RoHS-compliant sourcing.
Supply support for AT45DB041B-CI-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 acquired Atmel in 2016 and maintains full support for legacy DataFlash products, including documentation, errata, and long-term manufacturing commitments.
The AT45DB041B-CI-2.5 belongs to the DataFlash family-designed specifically for embedded systems needing SPI-based nonvolatile storage with integrated buffering to simplify firmware update, code shadowing, and configuration management without external logic.
FAQ
What is the maximum clock frequency supported by the AT45DB041B-CI-2.5?
The AT45DB041B-CI-2.5 supports a maximum SPI clock frequency of 20 MHz under specified operating conditions (2.5V–3.6V supply, industrial temperature range). This timing enables high-throughput continuous array reads and efficient buffer-to-memory transfers. Exceeding this limit may cause command rejection or data corruption, as validated in the official Microchip datasheet revision 3443D–DFLSH–2/08. The AT45DB041B-CI-2.5 does not support overclocking or dynamic frequency scaling.
Does the AT45DB041B-CI-2.5 require high-voltage programming signals?
No, the AT45DB041B-CI-2.5 operates entirely from its single 2.5V–3.6V supply for both read and program operations-no external 12V or 5V programming voltage is needed. All erase and program cycles are internally self-timed and powered from VCC. This eliminates charge pump circuitry and simplifies board design. The AT45DB041B-CI-2.5 achieves this through optimized floating-gate transistor architecture and on-chip voltage regulation, as confirmed in Section 1 and Table 5-4 of the datasheet.
How does the dual-buffer architecture of the AT45DB041B-CI-2.5 improve system performance?
The AT45DB041B-CI-2.5's two independent 264-byte SRAM buffers allow simultaneous data reception into one buffer while reprogramming flash from the other-enabling zero-gap streaming for OTA updates or audio playback. This eliminates CPU polling or interrupt-driven handshaking. For example, while Buffer 1 writes to Page 1024, Buffer 2 accepts new data from the host. The AT45DB041B-CI-2.5 manages buffer arbitration internally, as detailed in Sections 4 and 5.2.6 of the datasheet.
Can the AT45DB041B-CI-2.5 be used in industrial temperature environments?
Yes, the AT45DB041B-CI-2.5 is rated for industrial temperature operation from −40°C to +85°C, as explicitly stated in the Features section and validated across AC/DC parametric testing per Microchip specification 3443D–DFLSH–2/08. It is qualified for use in motor drives, PLC I/O modules, and outdoor surveillance equipment. The CI suffix denotes industrial grade; the AT45DB041B-CI-2.5 undergoes extended burn-in and temperature cycling to ensure reliability under thermal stress.
What is the purpose of the RDY/BUSY pin on the AT45DB041B-CI-2.5?
RDY/BUSY is an open-drain output that goes low during internally self-timed operations-including page erase, buffer-to-memory program, page compare, and main memory-to-buffer transfer. It provides hardware flow control so the host MCU can avoid issuing conflicting commands. The AT45DB041B-CI-2.5 also exposes this status in bit 7 of the status register for software polling. External 1 kΩ pull-up is required, as documented in Section 5.5.7 and Figure 5-1 of the datasheet.
AT45DB041B-CI-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 14-LBGA, CSPBGA
- Packaging:
- Tray
- 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:
- 14-CBGA (4.5x7)
AT45DB041B-CI-2.5 FAQ
1.How can I place an order for AT45DB041B-CI-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB041B-CI-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-CI-2.5 reliable?
The price and inventory of AT45DB041B-CI-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-CI-2.5 is usually 5 days.
3.What payment methods are accepted for AT45DB041B-CI-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB041B-CI-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB041B-CI-2.5?
AT45DB041B-CI-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB041B-CI-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-CI-2.5?
For technical support, including AT45DB041B-CI-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB041B-CI-2.5 requirements.
6.How does Aetrix verify that AT45DB041B-CI-2.5 is sourced from the original manufacturer or authorized distributors?
All AT45DB041B-CI-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-CI-2.5 meets industry standards.
7.What is the process for return or replacement of AT45DB041B-CI-2.5?
All AT45DB041B-CI-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB041B-CI-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-CI-2.5 part is unused and in its original packaging.
Return procedure for AT45DB041B-CI-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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