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AT45DB642D-TU
AT45DB642D-TU
| Part Number | AT45DB642D-TU |
|---|---|
| Manufacturer | Adesto Technologies (Formerly Atmel) |
| Category | Integrated Circuits (ICs) > Memory – Flash Memory |
| Description | 64-Mbit DataFlash Serial Flash Memory, 2.7V~3.6V, 66MHz SPI & RapidS, Dual SRAM Buffers, 28-TSOP (8.0mm×13.4mm). |
| Stock Status | In Stock |
| Origin | Original Factory |
Product Overview
The AT45DB642D-TU is a 64-Megabit (67,108,864-bit) serial DataFlash memory manufactured by Adesto Technologies (Formerly Atmel). Adopting reliable DataFlash architecture, it consists of 32,768 pages with 256/264 bytes per page. Equipped with dual SRAM data buffers, it supports continuous data buffering and page reprogramming without halting system operation. Supporting SPI and RapidS interface with maximum 66MHz clock frequency, it operates from 2.7V to 3.6V. Packaged in standard 28-TSOP Type I and rated for -40°C ~ +85°C industrial temperature range, it is ideal for code storage, data logging, boot program and voice/image buffering in embedded systems.
Core Advantages
Dual SRAM Buffer Architecture
Two independent 256/264-byte SRAM buffers support seamless read, write and background programming, improving throughput for data logging and firmware upgrade.
Flexible Page Size Configuration
Selectable 256-byte binary page or 264-byte extended page with spare bytes for metadata, convenient for integration into mainstream embedded file systems.
High-Speed Serial SPI & RapidS
Supports SPI Mode 0 / Mode 3 with clock up to 66MHz, delivering fast sequential read speed and low-latency command response for microcontroller hosts.
Comprehensive Security & Protection
Built-in hardware and software protection functions including sector locking, 128-byte OTP security register to prevent unauthorized data modification and copy.
Key Specifications
| Brand | Adesto Technologies |
|---|---|
| RoHS Status | RoHS Compliant / Lead-Free / Green |
| EDA/CAD Model | Schematic symbol models, 3D CAD step profiles, and 28-TSOP PCB footprint land patterns are available on request |
| Warranty | 1-Year Standard Quality Warranty |
| Package / Case | 28-TSOP (8.0mm × 13.4mm) |
| Mounting Type | Surface Mount (SMT / SMD) |
| Surface Marking / Silkscreen | AT45DB642D TU Marking |
| Memory Size | 64 Megabit (64Mb / 8 Megabyte) |
| Memory Type | DataFlash (Serial Flash) |
| Interface | SPI (Serial Peripheral Interface), RapidS |
| Clock Frequency | Up to 66 MHz |
| Page Size | 264 Bytes / 256 Bytes (User Configurable) |
| Supply Voltage (Vcc) | 2.7V to 3.6V |
| Operating Temperature Range | -40°C to +85°C (Industrial Grade) |
| Packaging Format | Tray / Tube |
| Data Retention | 20 Years (Typical) |
| Endurance | ≥100,000 Page Erase/Write Cycles |
| Read Supply Current | 10 ~ 15mA Typical |
| Standby Current | 25μA Typical |
| Deep Power-down Current | 15μA Typical |
Typical Applications
- Embedded system boot code storage, program memory, and parameter storage
- Industrial data loggers, smart utility meters, and telemetry terminals
- Consumer electronics, digital voice recorders, and smart home appliances
- Networking routers, switches, gateways, and telecom access points
- Medical monitoring devices and portable diagnostic equipment
Order & Shipping Info
| Minimum Order Quantity (MOQ) | 1 Piece |
|---|---|
| Shipping Time | Shipped within 1-2 business days |
| Delivery Time | 3-7 working days worldwide |
| Shipping Methods | DHL, UPS, FedEx, EMS |
| Payment Methods | T/T (Bank Transfer), PayPal, Credit Card, Western Union |
Technical Support
For datasheet, sample requests, stock check, or bulk pricing, please use the Quick Inquiry form. We will reply within 24 hours.
Frequently Asked Questions
Q1: What does the “TU” suffix mean in AT45DB642D-TU?
A1: The “T” represents 28-TSOP package. “U” stands for Matte Sn lead-free / RoHS compliant finish, supporting industrial temperature range (-40°C ~ +85°C).
Q2: What is the difference between DataFlash and standard SPI NOR Flash?
A2: DataFlash supports small-page (256/264-byte) erase & programming, equipped with dual SRAM buffers. No need to erase large 4K/64K blocks before writing compared to ordinary NOR flash.
Q3: Can the page size be permanently switched from 264 bytes to 256 bytes?
A3: Yes. Send a one-time configuration command to lock the chip into 256-byte binary page mode, making address alignment easier for common embedded file systems.
Q4: Is AT45DB642D-TU pin-to-pin compatible with older AT45DB642 revisions?
A4: Yes. AT45DB642D is an upgraded version of legacy “B” / “C” variants. It provides higher clock speed and lower power consumption while maintaining full pin compatibility on the 28-TSOP footprint.
Q5: What alternative & compatible models can replace AT45DB642D-TU?
A5: Direct alternatives: AT45DB641E (64Mb DataFlash). If switching architecture, W25Q64JV (64Mb SPI NOR) can be considered, but note page size and erase operation rules are different, firmware modification may be required.
Q6: What is the typical data retention and write endurance of AT45DB642D-TU?
A6: Typical data retention reaches 20 years. It supports minimum 100,000 times page erase/write cycles under standard operating temperature.
Q7: Can this memory work with 3.3V microcontrollers?
A7: Yes. The operating voltage range is 2.7V ~ 3.6V, perfectly matching common 3.3V MCU systems.
Q8: Does AT45DB642D-TU support RapidS high-speed read mode?
A8: Yes. Apart from standard SPI Mode 0/3, it supports RapidS interface to achieve faster sequential read speeds for data logging applications.
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