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Microchip Technology AT45DB081B-TC
- Part No.:
- AT45DB081B-TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
AT45DB081B-TC.pdf
- Description:
- IC FLASH 8MBIT SPI 20MHZ 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,309
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Product details
Overview
AT45DB081B-TC from Microchip Technology (formerly Atmel) is an 8-Mbit serial DataFlash memory IC designed for embedded code shadowing, firmware storage, and data logging in resource-constrained systems. It features 4096 pages × 264 bytes, dual 264-byte SRAM buffers, SPI interface (modes 0/3), 20 MHz max clock, and 2.5V–3.6V or 2.7V–3.6V single-supply operation.
For engineers reviewing the AT45DB081B-TC datasheet, AT45DB081B-TC pinout, AT45DB081B-TC application, or AT45DB081B-TC equivalent, key selection considerations include continuous array read capability, hardware write protection (WP), RDY/BUSY signaling, 5.0V-tolerant control pins, and page/block erase flexibility for in-system reprogramming.
Technical Context
The AT45DB081B-TC implements a three-level memory architecture (pages → blocks → sectors) with 4096 × 264-byte pages organized into 512 blocks of 8 pages each. Its dual-buffer architecture enables concurrent data reception (into one buffer) while reprogramming nonvolatile memory (from the other buffer), supporting uninterrupted streaming.
It uses standard SPI protocol with no external high-voltage programming required; all operations-including page program with built-in erase, block erase, and auto page rewrite-are self-timed and controlled via 8-bit opcodes. The device supports both SPI Mode 0 and Mode 3, with SCK inactive state sampled on CS fall to auto-detect mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 8,650,752 bits (4096 pages × 264 bytes) |
| Interface | SPI-compatible, modes 0 and 3; 3-wire (SI/SO/SCK) + CS/RESET/WP |
| Max Clock Frequency | 20 MHz - enables fast sequential reads and buffered writes |
| Supply Voltage | 2.5V–3.6V or 2.7V–3.6V - single supply simplifies power design |
| Active Read Current | 4 mA typical - low power for battery-backed or portable applications |
| Standby Current | 2 µA typical - ultra-low quiescent draw during idle states |
| Input Tolerance | 5.0V-tolerant on SI, SCK, CS, RESET, WP - eases level-shifting with 5V controllers |
| Temperature Range | Commercial (0°C to +70°C) and Industrial (–40°C to +85°C) |
Pinout & Package
AT45DB081B-TC is supplied in a 28-pin TSOP-I (Thin Small Outline Package) with Type 1 pinout, 0.55 mm pitch, and JEDEC MO-153 compliant footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; falling edge initiates command sequence |
| SCK | Serial Clock | Input-only; controls data timing; rising edge latches SI, falling edge outputs SO |
| SI | Serial Input | Input-only; receives opcodes, addresses, and data (MSB first) |
| SO | Serial Output | Output-only; returns read data and status register bits |
| WP | Hardware Write Protect | Low = locks first 256 pages; enables secure boot code storage |
| RESET | Chip Reset | Active-low; aborts ongoing operation and resets internal state machine |
| RDY/BUSY | Open-drain Status Indicator | Pulled low during self-timed operations (erase/program/transfer); requires 1 kΩ external pull-up |
| VCC / GND | Power Supply | Single 2.5V–3.6V supply; decoupling capacitor recommended near VCC pin |
Key Features
| Feature | Design Value |
|---|---|
| Continuous Array Read | Enables seamless code shadowing without address retransmission across page boundaries |
| Dual SRAM Buffers | 2 × 264-byte buffers allow pipelined data flow: receive new data while programming flash |
| Page Program with Built-in Erase | Single-cycle reprogram (erase + write) eliminates separate erase step; reduces firmware update latency |
| Hardware Data Protection | WP pin + RESET pin + status register monitoring provide layered reliability for critical storage |
| 5.0V-Tolerant Control Pins | Eliminates level shifters when interfacing with legacy 5V microcontrollers or FPGAs |
| Backward Compatibility | 100% pin- and function-compatible with AT45DB081 and AT45DB081A - drop-in upgrade path |
Applications
| Firmware Storage | Code Shadowing |
|---|---|
Use Scenario: Storing bootloader and application firmware in industrial PLCs where field updates must be reliable and atomic. IC Role / Device Role / Timing Role: Nonvolatile storage medium accessed via SPI during boot and OTA update cycles. Use Value: Page-erase granularity and built-in erase-on-program reduce update time and wear leveling complexity vs. conventional NOR Flash. | Use Scenario: Copying executable code from flash to RAM at startup in audio DSP systems with tight boot-time constraints. IC Role / Device Role / Timing Role: Serial memory source for continuous instruction fetch via SPI DMA controller. Use Value: Continuous Array Read mode delivers uninterrupted 20 MHz data stream across page boundaries-no CPU intervention needed. |
| Data Logging | Secure Configuration Storage |
Use Scenario: Recording sensor readings in environmental monitors operating on coin-cell batteries for >5 years. IC Role / Device Role / Timing Role: Low-power persistent storage with burst-write capability using dual buffers. Use Value: 2 µA standby current and buffer-assisted write minimize energy per logged sample; avoids full-page erase overhead. | Use Scenario: Storing cryptographic keys and calibration parameters in medical diagnostic equipment requiring tamper resistance. IC Role / Device Role / Timing Role: Protected configuration memory with hardware write lock (WP) and reset-safe initialization. Use Value: WP pin prevents accidental overwrite of first 256 pages-ideal for immutable boot assets and security-critical data. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| W25Q80DVSSIG | 8 Mbit Quad SPI (QSPI) interface; 104 MHz max clock; no dual buffers; no continuous array read | Better throughput for random access; lacks pipelined streaming capability | Select if system uses QSPI controller and prioritizes peak bandwidth over streaming efficiency |
| MX25L8006EM1I-12G | 8 Mbit standard SPI; 85 MHz max clock; no SRAM buffers; no hardware WP pin | Higher clock speed but no concurrent buffer operation; requires software-managed write protection | Select for cost-sensitive designs where buffer concurrency and hardware WP are not required |
Compared with W25Q80DVSSIG and MX25L8006EM1I-12G, the AT45DB081B-TC uniquely delivers dual-buffer pipelining and continuous array read-critical for deterministic streaming and code shadowing-while maintaining 5.0V-tolerant control pins and backward compatibility with legacy Atmel DataFlash designs.
Availability
AT45DB081B-TC is available at Aetrix Electronics and suitable for firmware storage, code shadowing, data logging, and secure configuration storage requiring stable component supply across long-lifecycle industrial and medical programs.
Supply support for AT45DB081B-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 delivering microcontrollers, analog, FPGA, and memory solutions with emphasis on reliability, longevity, and embedded control.
The AT45DB081B-TC belongs to Microchip's DataFlash family-designed specifically for SPI-based embedded systems needing high-density serial memory with streaming efficiency, low-voltage operation, and robust in-system programmability.
FAQ
What is the memory organization of the AT45DB081B-TC?
The AT45DB081B-TC organizes its 8,650,752-bit capacity as 4096 pages of 264 bytes each (256 data + 8 spare bytes). It also includes two independent 264-byte SRAM buffers. This structure supports page-level programming, block erases (8 pages), and sector-level management-enabling flexible firmware partitioning and wear leveling in the AT45DB081B-TC.
Does the AT45DB081B-TC require high-voltage programming?
No, the AT45DB081B-TC operates entirely from a single 2.5V–3.6V or 2.7V–3.6V supply for both read and program operations. All erase and program functions-including page program with built-in erase-are self-timed and require no external high-voltage generator. This simplifies board design and improves reliability in the AT45DB081B-TC.
How does the RDY/BUSY pin function in the AT45DB081B-TC?
The RDY/BUSY pin on the AT45DB081B-TC is an open-drain output pulled low during internally self-timed operations (e.g., page program, block erase, buffer transfer). It remains high otherwise. A 1 kΩ external pull-up resistor is required. Monitoring this pin allows host processors to avoid polling the status register and enables deterministic timing control in the AT45DB081B-TC.
Can the AT45DB081B-TC be used with 5V microcontrollers?
Yes-the SI, SCK, CS, RESET, and WP pins of the AT45DB081B-TC are 5.0V-tolerant, allowing direct connection to 5V logic without level shifters. VCC must still be within 2.5V–3.6V. This interoperability simplifies integration with legacy 5V MCUs and FPGAs while preserving low-power benefits in the AT45DB081B-TC.
Is the AT45DB081B-TC compatible with earlier Atmel DataFlash devices?
Yes-the AT45DB081B-TC is 100% compatible with AT45DB081 and AT45DB081A in pinout, command set, and timing. It serves as a drop-in replacement with identical functionality and improved manufacturing consistency. Designers can migrate to the AT45DB081B-TC without PCB or firmware changes.
AT45DB081B-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:
- 8Mbit
- Memory Organization:
- 264 Bytes x 4096 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
AT45DB081B-TC FAQ
1.How can I place an order for AT45DB081B-TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB081B-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 AT45DB081B-TC reliable?
The price and inventory of AT45DB081B-TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB081B-TC is usually 5 days.
3.What payment methods are accepted for AT45DB081B-TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB081B-TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB081B-TC?
AT45DB081B-TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB081B-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 AT45DB081B-TC?
For technical support, including AT45DB081B-TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB081B-TC requirements.
6.How does Aetrix verify that AT45DB081B-TC is sourced from the original manufacturer or authorized distributors?
All AT45DB081B-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 AT45DB081B-TC meets industry standards.
7.What is the process for return or replacement of AT45DB081B-TC?
All AT45DB081B-TC units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB081B-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 AT45DB081B-TC part is unused and in its original packaging.
Return procedure for AT45DB081B-TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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