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Microchip Technology AT45DB041B-TC-2.5
- Part No.:
- AT45DB041B-TC-2.5
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
AT45DB041B-TC-2.5.pdf
- Description:
- IC FLASH 4MBIT SPI 15MHZ 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,790
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Product details
Overview
AT45DB041B-TC-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 frequency, and single 2.5V–3.6V supply operation. It enables code shadowing, in-system reprogrammability, and concurrent buffer access during flash programming - ideal for embedded firmware storage in resource-constrained microcontroller systems.
For engineers reviewing the AT45DB041B-TC-2.5 datasheet, AT45DB041B-TC-2.5 pinout, AT45DB041B-TC-2.5 application, or AT45DB041B-TC-2.5 equivalent, key selection considerations include its page-erase flexibility, hardware write protection (WP), RDY/BUSY open-drain signaling, 5.0V-tolerant SI/SCK/CS/RESET/WP inputs, and support for SPI Mode 0/3 with continuous array read capability.
Technical Context
The AT45DB041B-TC-2.5 implements a three-level memory architecture (sector/block/page) with 256-byte main data + 8-byte overhead per page, enabling efficient partial-page updates via buffer-assisted read-modify-write. Its dual SRAM buffers allow pipelined operation: while one buffer feeds data to flash, the other accepts new input - eliminating bus contention during reprogramming.
Internally self-timed operations eliminate external timing control; all program/erase cycles (page, block, auto-rewrite) complete within specified tEP/tPE/tBE limits. The device defaults to SPI Mode 3 at power-on and uses MSB-first serial framing with opcode-driven command set, supporting both inactive-low and inactive-high clock polarity configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4,325,376 bits (2048 × 264-byte pages), providing 512 KiB usable storage with built-in 8-byte overhead per page |
| Supply Voltage | 2.5V–3.6V (single supply); eliminates need for charge pumps or auxiliary voltage rails during program/read |
| Max Clock Frequency | 20 MHz SPI interface; supports high-throughput streaming reads and fast buffer writes in real-time systems |
| Active Read Current | 4 mA typical; enables low-power operation in battery-backed or energy-sensitive applications |
| Standby Current | 2 µA typical CMOS standby; allows deep-sleep retention without external power gating |
| Input Tolerance | 5.0V-tolerant SI, SCK, CS, RESET, WP pins; simplifies level-shifting in mixed-voltage MCU designs |
| Temperature Range | -40°C to +85°C industrial grade; qualified for extended ambient operation in industrial controllers and automotive ECUs |
Pinout & Package
AT45DB041B-TC-2.5 is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with 150 mil body width, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; initiates command sequence on falling edge and terminates operation on rising edge |
| SCK | Serial Clock | Input-only; controls data transfer timing; rising edge clocks data in, falling edge clocks data out |
| SI | Serial Input | Input-only; receives opcodes, addresses, and data; 5.0V-tolerant for direct MCU GPIO connection |
| 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 against accidental overwrite; 5.0V-tolerant |
| RESET | Chip Reset | Active-low; aborts ongoing operation and resets internal state machine; 5.0V-tolerant |
| 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; no separate VIO required; GND referenced for all I/O |
Key Features
| Feature | Design Value |
|---|---|
| Dual 264-byte SRAM buffers | Enables simultaneous data reception into one buffer while reprogramming flash from the other - critical for uninterrupted firmware updates |
| Continuous Array Read | Supports seamless code shadowing: automatic address wrap across page boundaries with no latency penalty at page edges |
| Page-level erase & program | Allows granular updates without erasing full sectors; reduces wear and improves endurance in frequently modified data regions |
| Hardware page write protection | Physically blocks reprogramming of first 256 pages via WP pin - prevents corruption of boot code or calibration tables |
| 5.0V-tolerant control inputs | Eliminates level shifters when interfacing with 3.3V or 5V MCUs - reduces BOM count and layout complexity |
Applications
| Firmware Storage | Industrial Data Logging |
|---|---|
Use Scenario: Storing bootloader, application firmware, and configuration parameters in a microcontroller-based edge node with limited PCB space. IC Role / Device Role / Timing Role: Nonvolatile program memory accessed via SPI; provides deterministic read latency and page-atomic update capability. Use Value: Enables field-upgradable firmware without external programming hardware; dual buffers allow background download while maintaining runtime execution. | Use Scenario: Capturing sensor readings (temperature, pressure, vibration) at 100 Hz in a factory-floor PLC with power-loss resilience. IC Role / Device Role / Timing Role: Cyclic data ring buffer implemented across multiple pages; RDY/BUSY signal synchronizes write commits to avoid data loss during brownouts. Use Value: 2 µA standby current extends backup battery life; page-erase granularity minimizes wear when rotating log entries. |
| Audio Playback Buffer | Medical Device Configuration |
Use Scenario: Streaming pre-recorded voice prompts or alarm tones from flash to a DAC in a portable diagnostic instrument. IC Role / Device Role / Timing Role: Continuous Array Read mode delivers uninterrupted 16-bit PCM audio at up to 20 MHz SCK - no gaps at page boundaries. Use Value: Eliminates need for large external RAM buffers; reduces system cost and power vs. parallel NOR flash alternatives. | Use Scenario: Storing calibrated sensor offsets, user preferences, and regulatory audit logs in an FDA-cleared patient monitor. IC Role / Device Role / Timing Role: Secure parameter store with hardware write protection (WP pin) locking critical calibration pages against runtime corruption. Use Value: Ensures traceable, tamper-resistant configuration persistence across power cycles and software updates. |
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-TCU | Successor generation with enhanced reliability, same pinout and command set; supports 2.3V–3.6V supply (wider than AT45DB041B-TC-2.5's 2.5V–3.6V) | Drop-in replacement for new designs requiring longer product lifecycle and improved data retention | Select for new designs where long-term availability and extended voltage margin are priorities |
| W25Q40EWUXIE | 4-Mbit Quad SPI flash; supports QPI/DTR modes, faster erase times (typ. 40 ms vs. 25 ms), but lacks dual SRAM buffers and continuous array read | Better throughput in high-speed host interfaces; unsuitable for true code shadowing or buffer-pipelined writes | Choose when host MCU supports Quad SPI and concurrent buffer operation is not required |
Compared with AT45DB041B-TC-2.5, AT45DB041D-TCU offers broader voltage range and extended longevity, while W25Q40EWUXIE trades buffer-assisted pipelining for higher raw bandwidth - making AT45DB041B-TC-2.5 uniquely suited for deterministic, low-latency embedded firmware and streaming applications.
Availability
AT45DB041B-TC-2.5 is available at Aetrix Electronics and suitable for firmware storage, industrial data logging, audio playback buffering, and medical device configuration requiring stable component supply across extended production lifecycles.
Supply support for AT45DB041B-TC-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 devices, and memory solutions for industrial, automotive, and consumer applications.
The AT45DB041B-TC-2.5 belongs to Microchip's legacy DataFlash family, designed specifically for SPI-based embedded systems needing reliable, low-pin-count nonvolatile storage with concurrent buffer access and page-granular reprogrammability.
FAQ
What is the maximum clock frequency supported by the AT45DB041B-TC-2.5?
The AT45DB041B-TC-2.5 supports a maximum SPI clock frequency of 20 MHz for all read, write, and command operations. This rating applies across the full industrial temperature range (-40°C to +85°C) and 2.5V–3.6V supply voltage. Timing compliance must be verified against the tSCLK (min 50 ns) and tSU/SUH (setup/hold) specifications in the official Microchip datasheet 3443D.
Does the AT45DB041B-TC-2.5 require high-voltage programming signals?
No, the AT45DB041B-TC-2.5 does not require high-voltage programming signals. All program and erase operations execute from the same 2.5V–3.6V supply used for read operations. Internal charge pumps generate necessary voltages, eliminating external HV circuitry and simplifying system design - a core advantage of the DataFlash architecture over traditional parallel NOR flash.
How does the dual-buffer architecture of the AT45DB041B-TC-2.5 improve system performance?
The AT45DB041B-TC-2.5's two independent 264-byte SRAM buffers enable overlapping operations: while one buffer streams data to flash memory during a page program, the other accepts new incoming data via SI. This pipelining reduces effective write latency by up to 100% compared to single-buffer flash, critical for real-time firmware updates and continuous data acquisition without CPU stalls.
What is the function of the RDY/BUSY pin on the AT45DB041B-TC-2.5?
The RDY/BUSY pin on the AT45DB041B-TC-2.5 is an open-drain output that goes low during any internally self-timed operation - including page/block erase, buffer-to-flash programming, page-to-buffer transfer, and compare operations. It remains low until completion, allowing the host MCU to poll asynchronously without reading the status register, reducing SPI traffic and improving determinism in time-critical applications.
Is the AT45DB041B-TC-2.5 compatible with standard SPI Mode 0 and Mode 3?
Yes, the AT45DB041B-TC-2.5 fully supports both SPI Mode 0 (CPOL=0, CPHA=0) and SPI Mode 3 (CPOL=1, CPHA=0). The device automatically detects the inactive clock polarity on each CS falling edge and adapts accordingly. This dual-mode compatibility ensures interoperability with diverse microcontrollers - including legacy 8-bit MCUs and modern ARM Cortex-M devices - without firmware modification.
AT45DB041B-TC-2.5 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:
- 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:
- 28-TSOP
AT45DB041B-TC-2.5 FAQ
1.How can I place an order for AT45DB041B-TC-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB041B-TC-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-TC-2.5 reliable?
The price and inventory of AT45DB041B-TC-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-TC-2.5 is usually 5 days.
3.What payment methods are accepted for AT45DB041B-TC-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB041B-TC-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB041B-TC-2.5?
AT45DB041B-TC-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB041B-TC-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-TC-2.5?
For technical support, including AT45DB041B-TC-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB041B-TC-2.5 requirements.
6.How does Aetrix verify that AT45DB041B-TC-2.5 is sourced from the original manufacturer or authorized distributors?
All AT45DB041B-TC-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-TC-2.5 meets industry standards.
7.What is the process for return or replacement of AT45DB041B-TC-2.5?
All AT45DB041B-TC-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB041B-TC-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-TC-2.5 part is unused and in its original packaging.
Return procedure for AT45DB041B-TC-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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