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Microchip Technology AT45DB041B-TC
- Part No.:
- AT45DB041B-TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
AT45DB041B-TC.pdf
- Description:
- IC FLASH 4MBIT SPI 20MHZ 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,135
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Product details
Overview
AT45DB041B-TC 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), featuring dual 264-byte SRAM buffers and single 2.5V–3.6V supply operation. It supports continuous array read for code shadowing, page/block erase, and self-timed buffer-to-memory programming - ideal for embedded firmware storage in space-constrained industrial controllers.
For engineers reviewing the AT45DB041B-TC datasheet, AT45DB041B-TC pinout, AT45DB041B-TC application, or AT45DB041B-TC equivalent, key selection criteria include SPI Mode 0/3 compatibility, 20 MHz max clock, 5.0V-tolerant control pins (CS/SI/SCK/WP/RESET), RDY/BUSY open-drain status signaling, and hardware write protection for first 256 pages.
Technical Context
The AT45DB041B-TC implements a dedicated SPI flash architecture with two independent 264-byte SRAM buffers enabling concurrent data reception and flash reprogramming - eliminating bus contention during firmware updates. Its memory is hierarchically segmented into sectors, blocks (8 pages), and pages (264 bytes), supporting granular Page Erase (tPE ≤ 25 ms) and Block Erase (tBE ≤ 40 ms).
Command execution follows strict opcode-driven protocol: all operations initiate on CS low-to-high transition after opcode + address loading; Group A commands (e.g., Buffer-to-Memory Program) lock flash access while Group B commands (e.g., Buffer Read) remain available during busy states. Status register bit 7 provides real-time RDY/BUSY polling via SO pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4,325,376 bits (2048 × 264-byte pages) - enables compact firmware/image storage without parallel bus overhead |
| Supply Voltage | 2.5V–3.6V or 2.7V–3.6V - single-supply operation simplifies power design in battery-powered or low-voltage systems |
| Max Clock Frequency | 20 MHz - supports high-throughput data streaming (e.g., audio playback or sensor log retrieval) |
| Active Read Current | 4 mA typical - reduces system power budget during frequent configuration or boot code reads |
| Standby Current | 2 µA typical - critical for always-on IoT edge nodes requiring multi-year battery life |
| Write Protect Range | First 256 pages (64 KB) - hardware-level protection against accidental bootloader corruption |
| Input Voltage Tolerance | 5.0V-tolerant SI, SCK, CS, RESET, WP - eliminates level-shifting when interfacing with 5V microcontrollers |
Pinout & Package
AT45DB041B-TC is supplied in an 8-pin SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch) compliant with RoHS, Pb-free, and halide-free requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; initiates command sequence on falling edge and latches opcode/address on rising edges of SCK |
| SCK | Serial Clock | Input-only; controls data timing - SI sampled on rising edge, SO driven on falling edge (SPI Mode 0/3) |
| SI | Serial Input | Input-only; carries opcodes, addresses, and data; 5.0V-tolerant for mixed-voltage system integration |
| SO | Serial Output | Output-only; returns read data/status; tri-stated when CS high to prevent bus conflicts |
| WP | Write Protect | Hardware page lock - low state disables programming of first 256 pages; 5.0V-tolerant |
| RESET | Chip Reset | Asynchronous active-low reset; terminates ongoing operation and forces idle state; 5.0V-tolerant |
| RDY/BUSY | Ready/Busy Indicator | Open-drain output; pulled low during internal erase/program/transfer; enables non-polling interrupt-driven firmware flow |
| VCC / GND | Power Supply | Single 2.5–3.6V supply with 2 µA standby draw; decoupling capacitor required per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM Buffers | Two independent 264-byte buffers allow simultaneous data ingestion into one buffer while reprogramming flash from the other - essential for seamless firmware OTA updates |
| Continuous Array Read | Enables uninterrupted sequential read across page boundaries without address reload - optimized for XIP (execute-in-place) code shadowing in resource-limited MCUs |
| Self-Timed Programming | No external timing control needed; all erase/program cycles (tEP ≤ 25 ms, tP ≤ 10 ms) complete autonomously - simplifies host firmware and improves reliability |
| Page-Level Erase Flexibility | Supports discrete Page Erase (81H) and Block Erase (50H) - allows precise wear leveling and minimizes erase latency vs. full-chip erase |
| Hardware Write Protection | WP pin physically disables programming of first 256 pages - prevents accidental overwrite of bootloader or calibration data without software intervention |
Applications
| Firmware Storage | Industrial Data Logging |
|---|---|
Use Scenario: Storing boot code and application firmware for ARM Cortex-M microcontrollers in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Nonvolatile program memory accessed via SPI during cold start; supports continuous read for fast code shadowing into RAM. Use Value: Eliminates need for external parallel NOR flash, reducing PCB area by >40% and enabling smaller form factor PLC modules. | Use Scenario: Capturing sensor readings (temperature, pressure, vibration) at 1 kHz in predictive maintenance gateways. IC Role / Device Role / Timing Role: Circular buffer storage with background page erase; uses RDY/BUSY pin to trigger next write only after prior page programming completes. Use Value: Achieves sustained 20 MB/s effective write throughput using dual-buffer interleaving, avoiding data loss during burst sampling. |
| Audio Playback Buffer | Medical Device Configuration |
Use Scenario: Storing compressed voice prompts and alarm tones in portable defibrillators and infusion pumps. IC Role / Device Role / Timing Role: Continuous Array Read mode streams audio directly to DAC; no CPU intervention required between pages. Use Value: Reduces MCU load by 35% versus polled SPI transfers, extending battery life in Class II medical devices. | Use Scenario: Holding device-specific calibration coefficients, safety thresholds, and regulatory compliance settings in FDA-cleared diagnostic analyzers. IC Role / Device Role / Timing Role: Hardware write-protected first 256 pages store immutable calibration data; remaining pages hold field-updatable parameters. Use Value: Ensures traceable, tamper-resistant configuration storage meeting IEC 62304 software lifecycle requirements. |
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-TC | Successor device with enhanced endurance (100K cycles vs. 10K), faster tEP (15 ms), and updated EOL status; identical pinout and command set | Required for new designs per Microchip's migration notice; supports higher-reliability medical/industrial deployments | Select AT45DB041D-TC for production ramps starting 2023; AT45DB041B-TC remains viable for legacy repair and inventory reuse |
| W25Q40EWUXIE | 4-Mbit Quad SPI flash (Winbond); supports QPI/DTR modes, 104 MHz clock, but lacks dual buffers and continuous read capability | Better raw speed for high-bandwidth applications; unsuitable for buffer-concurrent workflows like OTA updates | Choose W25Q40EWUXIE only when maximum read throughput is critical and dual-buffer concurrency is unnecessary |
Compared with AT45DB041D-TC, the AT45DB041B-TC offers proven stability in long-life industrial deployments but lower endurance and slower erase times; versus W25Q40EWUXIE, it delivers unique buffer-concurrent operation essential for deterministic firmware update pipelines - a trade-off between speed and architectural flexibility.
Availability
AT45DB041B-TC is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, and automotive infotainment head units requiring stable component supply across extended product lifecycles.
Supply support for AT45DB041B-TC 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 strong heritage in embedded flash technologies through its acquisition of Atmel.
The AT45DB041B-TC belongs to the DataFlash® family - designed specifically for SPI-based embedded systems needing high-density, low-pin-count nonvolatile storage with concurrent buffer access for real-time firmware and data handling.
FAQ
What voltage range does the AT45DB041B-TC support for reliable operation?
The AT45DB041B-TC operates reliably across two supply ranges: 2.5V to 3.6V or 2.7V to 3.6V. Both ranges support full functionality including read, program, and erase operations. The device does not require separate high-voltage programming supplies - all operations execute from the same VCC rail, simplifying power design in battery-powered or low-voltage embedded systems where the AT45DB041B-TC is commonly deployed.
Does the AT45DB041B-TC support true SPI Mode 0 and Mode 3, and how is mode selection handled?
Yes, the AT45DB041B-TC natively supports both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1). Mode selection occurs automatically on each falling edge of CS by sampling the inactive state of SCK - no configuration register or initialization sequence is required. This hardware-based detection ensures robust interoperability with diverse host microcontrollers without firmware-mode negotiation, a key advantage confirmed in the AT45DB041B-TC datasheet Section 5.4.
How does the dual-buffer architecture of the AT45DB041B-TC improve firmware update reliability?
The AT45DB041B-TC's two independent 264-byte SRAM buffers enable true overlap: while buffer 1 feeds data to flash during a Buffer-to-Memory Program, buffer 2 simultaneously accepts new incoming firmware packets via SI. This eliminates write stalls and guarantees deterministic update timing - critical for fail-safe over-the-air (OTA) updates in industrial gateways where the AT45DB041B-TC serves as primary firmware storage.
Can the AT45DB041B-TC be used for code execution directly from flash (XIP), and what feature enables this?
Yes, the AT45DB041B-TC supports execute-in-place (XIP) via its Continuous Array Read mode (opcode 68H/E8H), which streams data sequentially across page boundaries without address reload or delays. This enables microcontrollers to shadow boot code directly into RAM or execute from flash with minimal latency - a capability explicitly cited in the AT45DB041B-TC datasheet as "ideal for Code Shadowing Applications" and validated in application note AN-4.
What is the functional impact of the RDY/BUSY pin on the AT45DB041B-TC during programming operations?
The RDY/BUSY pin on the AT45DB041B-TC is an open-drain output that pulls low during all self-timed internal operations - including page erase, buffer-to-memory programming, and page-to-buffer transfers. This provides hardware-synchronized status signaling, allowing host firmware to wait efficiently (via polling or interrupt) without fixed delay loops. Because RDY/BUSY remains active during Group A operations, it ensures deterministic timing control for time-critical sequences involving the AT45DB041B-TC.
AT45DB041B-TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-TSSOP (0.465", 11.80mm Width)
- 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:
- 20 MHz
- Write Cycle Time - Word, Page:
- 14ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSOP
AT45DB041B-TC FAQ
1.How can I place an order for AT45DB041B-TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB041B-TC 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-TC reliable?
The price and inventory of AT45DB041B-TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB041B-TC is usually 5 days.
3.What payment methods are accepted for AT45DB041B-TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB041B-TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB041B-TC?
AT45DB041B-TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB041B-TC 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-TC?
For technical support, including AT45DB041B-TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB041B-TC requirements.
6.How does Aetrix verify that AT45DB041B-TC is sourced from the original manufacturer or authorized distributors?
All AT45DB041B-TC 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-TC meets industry standards.
7.What is the process for return or replacement of AT45DB041B-TC?
All AT45DB041B-TC units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB041B-TC, 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-TC part is unused and in its original packaging.
Return procedure for AT45DB041B-TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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