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Renesas AT25SF081-SHD-T
- Part No.:
- AT25SF081-SHD-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25SF081-SHD-T.pdf
- Description:
- IC FLASH 8MBIT SPI/QUAD 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,221
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Product details
Overview
AT25SF081-SHD-T from Dialog Semiconductor is an 8-Mbit serial flash memory IC designed for code shadowing and data storage in embedded systems. It operates from a single 2.3V–3.6V supply, supports SPI Modes 0/3, delivers up to 104 MHz clock frequency, achieves 6 ns clock-to-output delay, and features uniform 4/32/64-Kbyte block erase plus full chip erase.
For engineers reviewing the AT25SF081-SHD-T datasheet, AT25SF081-SHD-T pinout, AT25SF081-SHD-T application, or AT25SF081-SHD-T equivalent, key selection criteria include dual/quad I/O read throughput, hardware write protection via WP pin, security register programmability, industrial temperature support (−40°C to +85°C), and RoHS-compliant 8-lead SOIC (208-mil) packaging.
Technical Context
The AT25SF081-SHD-T implements a flexible erase architecture with four granular erase levels-256-byte page, 4-Kbyte, 32-Kbyte, and 64-Kbyte blocks-enabling efficient co-location of code modules and data segments without memory waste. Its memory array is organized to allow independent erasure of logically distinct regions.
It supports multiple high-speed read modes: standard SPI (03h/0Bh), Dual-Output Read (3Bh), Dual-I/O Read (BBh), Quad-Output Read (6Bh), and Quad-I/O Read (EBh), all requiring explicit Quad Enable (QE) bit setting in Status Register for quad modes. All operations are controlled via 8-bit opcodes with MSB-first addressing and configurable dummy cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 8 Mbit (1,048,576 bytes); sufficient for firmware images and configuration data in resource-constrained microcontrollers. |
| Supply Voltage | 2.3 V to 3.6 V; compatible with modern low-voltage MCU I/O domains without level shifting. |
| Max Clock Frequency | 104 MHz; enables fast instruction fetch and data streaming in high-performance boot and logging applications. |
| Read Latency | 6 ns tV (clock-to-output); minimizes wait states during sequential code execution from flash. |
| Erase Granularity | Uniform 4-Kbyte, 32-Kbyte, 64-Kbyte blocks + full chip; allows precise field-upgrade partitioning without over-erasing. |
| Security Registers | 3 programmable, individually lockable pages; supports ESN storage, device serialization, and secure key management. |
| Endurance & Retention | 100,000 program/erase cycles and 20-year data retention; meets long-life requirements for industrial and automotive control units. |
Pinout & Package
AT25SF081-SHD-T is packaged in an industry-standard 8-lead SOIC (208-mil) body with 1.27 mm pitch. Pin functions are electrically defined per JEDEC MS-012, with all I/O pins supporting bidirectional operation in quad/dual modes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select input | Active-low enable; initiates all commands and places SO/SI in high-Z when deasserted. |
| SCK | Serial clock input | Controls data latching (rising edge) and output timing (falling edge); polarity/phase configurable for SPI Modes 0/3. |
| SI (I/O0) | Serial input / Quad/Dual I/O | Accepts opcodes, addresses, and data; becomes output (I/O0) in Dual/Quad Read modes for parallel data transfer. |
| SO (I/O1) | Serial output / Quad/Dual I/O | Outputs read data; becomes output (I/O1) in Dual/Quad Read modes; high-Z when CS is deasserted. |
| WP (I/O2) | Write protect input / Quad I/O | Hardware lock for protected blocks; becomes I/O2 in Quad Read mode; internally pulled high. |
| HOLD (I/O3) | Communication pause input / Quad I/O | Halts ongoing transfers without deselecting device; becomes I/O3 in Quad Read mode; internally pulled high. |
| VCC | Power supply | 2.3–3.6 V main supply; powers core logic and I/O buffers; decoupling required per layout guidelines. |
| GND | Ground reference | System ground return path; must be low-impedance and adjacent to VCC for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual/Quad I/O Read Support | Enables 2× or 4× read bandwidth vs. standard SPI-critical for reducing boot time and real-time data streaming latency. |
| Flexible Erase Architecture | Four uniform erase block sizes eliminate wasted space in mixed code+data layouts, increasing effective usable density. |
| Hardware Write Protection | WP pin provides immediate, glitch-immune locking of protected sectors-essential for bootloader and calibration data integrity. |
| Security Register Pages | Three dedicated, individually lockable pages enable secure storage of unique identifiers and cryptographic keys without external EEPROM. |
| Low-Power Operation | 2 µA deep power-down current allows battery-backed retention in always-on IoT nodes and portable devices. |
Applications
| Industrial PLC Firmware Storage | Automotive Infotainment Boot Memory |
|---|---|
|
Use Scenario: Storing firmware images and runtime configuration for programmable logic controllers operating in harsh environments. IC Role / Device Role / Timing Role: Nonvolatile code storage with fast random-access read capability and deterministic erase timing for field updates. Use Value: Uniform 4-Kbyte erase blocks align precisely with PLC firmware module boundaries, preventing corruption during partial reprogramming. |
Use Scenario: Hosting boot code and UI assets for head-unit systems requiring rapid startup and secure OTA update handling. IC Role / Device Role / Timing Role: Primary SPI flash for XIP-capable MCUs; supports Quad-I/O Read at 104 MHz for sub-100ms boot sequence. Use Value: 6 ns tV and 104 MHz interface reduce CPU wait states, while security registers store vehicle-specific ESN and encryption keys. |
| Smart Meter Data Logging | Medical Diagnostic Device Calibration Storage |
|
Use Scenario: Recording time-stamped energy consumption data across 10+ years of field operation with periodic overwrite. IC Role / Device Role / Timing Role: High-endurance data logger with wear-leveling enabled by 100K-cycle endurance and fine-grained 4-Kbyte erase. Use Value: 20-year data retention and 2 µA deep power-down ensure accurate historical records even during extended mains outages. |
Use Scenario: Storing factory-calibrated sensor coefficients and regulatory compliance metadata in portable diagnostic tools. IC Role / Device Role / Timing Role: Tamper-resistant nonvolatile storage with hardware write protection and locked security registers. Use Value: Individually lockable security pages prevent unauthorized modification of calibration data, satisfying IEC 62304 traceability 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 |
|---|---|---|---|
| AT25SF081B-SHD-T | Direct successor with enhanced reliability, same pinout and command set; supports identical voltage, timing, and package. | Recommended for new designs; offers improved endurance and qualification for extended temperature ranges. | Select AT25SF081B-SHD-T for production ramp; AT25SF081-SHD-T remains viable for legacy replacement only. |
| Winbond W25Q80DVSSIG | 8-Mbit SPI flash with Quad I/O, but lacks security register pages and uses different status register bit mapping. | Requires firmware adaptation for security and status polling; suitable where cryptographic key storage is not required. | Choose W25Q80DVSSIG only if existing software stack already supports its command set and no security registers are needed. |
Compared with AT25SF081B-SHD-T, the AT25SF081-SHD-T lacks updated process qualifications and has no security register lock granularity beyond page-level; versus W25Q80DVSSIG, it provides native ESN/key storage but requires different initialization sequences for quad mode enablement.
Availability
AT25SF081-SHD-T is available at Aetrix Electronics and suitable for industrial automation, automotive infotainment, and medical diagnostics requiring stable component supply and long-term lifecycle support.
Supply support for AT25SF081-SHD-T 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
Dialog Semiconductor, acquired Adesto Technologies in 2021, specializes in low-power integrated circuits for mobile, IoT, and industrial applications.
The AT25SF081-SHD-T belongs to Dialog's serial flash memory product line, engineered for robust code execution and secure data storage in resource-constrained embedded systems operating across industrial temperature ranges.
FAQ
What is the maximum operating frequency supported by the AT25SF081-SHD-T?
The AT25SF081-SHD-T supports a maximum clock frequency of 104 MHz for Quad-I/O and Dual-I/O Read operations, and up to 85 MHz for standard Read Array and Dual-Output Read. This enables high-throughput data access critical for fast boot and real-time logging applications using the AT25SF081-SHD-T.
Does the AT25SF081-SHD-T support hardware write protection?
Yes, the AT25SF081-SHD-T includes hardware-controlled write protection via the WP pin, allowing physical locking of protected memory blocks without software intervention. This feature ensures bootloader and calibration data integrity in the AT25SF081-SHD-T, especially during power transitions or firmware updates.
How many security register pages does the AT25SF081-SHD-T provide?
The AT25SF081-SHD-T provides three programmable security register pages, each individually lockable to store unique device identifiers, electronic serial numbers (ESN), or encrypted keys. These pages are accessible only through dedicated security commands in the AT25SF081-SHD-T instruction set.
What erase block sizes are available on the AT25SF081-SHD-T?
The AT25SF081-SHD-T supports uniform 4-Kbyte, 32-Kbyte, and 64-Kbyte block erase, plus full chip erase and byte/page programming (1–256 bytes). This multi-level granularity optimizes memory utilization for both code and data storage in the AT25SF081-SHD-T, minimizing wasted space during partial updates.
Is the AT25SF081-SHD-T pin-compatible with the AT25SF081B-SHD-T?
Yes, the AT25SF081-SHD-T is pin-compatible and functionally interoperable with the AT25SF081B-SHD-T, sharing identical SOIC-8 (208-mil) footprint, pinout, command set, and electrical specifications. However, the AT25SF081B-SHD-T is the recommended replacement for new designs due to enhanced process reliability.
AT25SF081-SHD-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH - NOR
- Memory Size:
- 8Mbit
- Memory Organization:
- 1M x 8
- Memory Interface:
- SPI - Quad I/O
- Clock Frequency:
- 104 MHz
- Write Cycle Time - Word, Page:
- 5µs, 5ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25SF081-SHD-T FAQ
1.How can I place an order for AT25SF081-SHD-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25SF081-SHD-T 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 AT25SF081-SHD-T reliable?
The price and inventory of AT25SF081-SHD-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25SF081-SHD-T is usually 5 days.
3.What payment methods are accepted for AT25SF081-SHD-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25SF081-SHD-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25SF081-SHD-T?
AT25SF081-SHD-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25SF081-SHD-T 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 AT25SF081-SHD-T?
For technical support, including AT25SF081-SHD-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25SF081-SHD-T requirements.
6.How does Aetrix verify that AT25SF081-SHD-T is sourced from the original manufacturer or authorized distributors?
All AT25SF081-SHD-T 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 AT25SF081-SHD-T meets industry standards.
7.What is the process for return or replacement of AT25SF081-SHD-T?
All AT25SF081-SHD-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25SF081-SHD-T, 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 AT25SF081-SHD-T part is unused and in its original packaging.
Return procedure for AT25SF081-SHD-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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