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Renesas AT25SF081-SSHF-T
- Part No.:
- AT25SF081-SSHF-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25SF081-SSHF-T.pdf
- Description:
- IC FLASH 8MBIT SPI/QUAD 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:200
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Product details
Overview
AT25SF081-SSHF-T from Dialog Semiconductor (formerly Adesto) is an 8-Mbit SPI 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-SSHF-T datasheet, AT25SF081-SSHF-T pinout, AT25SF081-SSHF-T application, or AT25SF081-SSHF-T equivalent, this page provides verified functional specifications, validated SOIC-8 (208-mil) package mapping, confirmed dual/quad I/O read support, and real-world use context for industrial and consumer firmware storage.
Technical Context
The AT25SF081-SSHF-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 wasted space. Its memory array is organized as 1 Mbyte (0x000000–0xFFFFF) with address bits A23–A0, though A23–A20 are ignored due to 8-Mbit capacity.
It supports hardware write protection via the WP pin, three programmable security register pages for ESN or key storage, and deep power-down mode drawing only 2 µA typical. Quad-I/O operation requires the Status Register QE bit to be set, and all high-speed read modes (Dual/Quad Output and I/O) rely on dedicated I/O pin reconfiguration (SI/SO/WP/HOLD as I/O0–I/O3).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 8 Mbit (1 Mbyte), enabling compact firmware storage without external memory expansion |
| Supply Voltage | 2.3V–3.6V single supply, compatible with modern low-voltage microcontrollers and PMIC rails |
| Max Clock Frequency | 104 MHz, supporting high-throughput boot code loading and OTA update streaming |
| Read Latency | 6 ns clock-to-output (tV), minimizing wait states during instruction fetch from flash |
| Erase Granularity | Uniform 4-Kbyte / 32-Kbyte / 64-Kbyte blocks + full chip erase, optimizing wear leveling and partitioned updates |
| Endurance & Retention | 100,000 program/erase cycles and 20-year data retention, suitable for field-upgradable embedded devices |
| Power Consumption | 2 µA deep power-down current (typical), enabling ultra-low-power sleep modes in battery-operated systems |
Pinout & Package
AT25SF081-SSHF-T is packaged in an 8-lead SOIC (208-mil) with gull-wing leads, RoHS-compliant and halide-free per JEDEC standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select input | Active-low enable signal; rising edge terminates operations and places SO in high-Z state |
| SCK | Serial clock input | Controls data timing; commands and addresses latched on rising edge, data output on falling edge |
| SI (I/O0) | Serial input / quad I/O | Input for commands/addresses; becomes I/O0 during Dual/Quad Read for parallel data output |
| SO (I/O1) | Serial output / quad I/O | Output for read data; becomes I/O1 during Dual/Quad Read; MSB always appears on SO/I/O1 |
| WP (I/O2) | Write protect / quad I/O | Hardware lock control for protected blocks; becomes I/O2 during Quad Read for 4-bit parallel output |
| HOLD (I/O3) | Communication pause / quad I/O | Halts SPI transfer without deselecting device; becomes I/O3 during Quad Read for full 4-bit bus |
| VCC | Power supply | 2.3V–3.6V main supply; invalid voltage causes spurious behavior and must be regulated |
| GND | Ground reference | System ground connection; required for stable logic thresholds and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Dual/Quad Output Read | Enables 2× or 4× read throughput vs standard SPI, reducing boot time and firmware update latency |
| Flexible Erase Architecture | Four uniform erase block sizes eliminate wasted space when storing mixed code/data partitions |
| Security Register Pages | Three programmable, individually lockable pages for ESN, cryptographic keys, or calibration data |
| Hardware Write Protection | WP pin enables physical lock of protected memory regions without software intervention or status register dependency |
| Deep Power-Down Mode | 2 µA typical standby current allows integration into energy-sensitive IoT endpoints and portable devices |
Applications
| Firmware Boot Storage | Industrial HMI Data Logging |
|---|---|
Use Scenario: Microcontroller boots application code from external flash into RAM for execution. IC Role / Device Role / Timing Role: Non-volatile code storage with fast random-access read capability and deterministic 6 ns tV latency. Use Value: Enables reliable cold-start operation and eliminates need for larger, more expensive parallel NOR flash. |
Use Scenario: Programmable logic controller records sensor history, configuration changes, and event timestamps. IC Role / Device Role / Timing Role: Persistent data buffer with uniform 4-Kbyte erase blocks aligned to log segment boundaries. Use Value: Prevents partial-sector corruption during power loss and supports wear-leveling across 100k-cycle endurance. |
| Consumer IoT OTA Updates | Medical Device Calibration Storage |
Use Scenario: Smart home hub receives encrypted firmware patches over Wi-Fi and writes them to flash before validation. IC Role / Device Role / Timing Role: High-speed quad-I/O interface (up to 104 MHz) accelerates patch ingestion and reduces radio-on time. Use Value: Cuts OTA window by >60% vs standard SPI, lowering power consumption and improving user experience. |
Use Scenario: Portable diagnostic instrument stores factory calibration coefficients and user-adjusted offsets. IC Role / Device Role / Timing Role: Security register pages store tamper-resistant calibration data with hardware lock via WP pin. Use Value: Ensures regulatory compliance (IEC 62304) by preventing unauthorized modification of critical measurement parameters. |
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-SSHF-T | Successor part with enhanced reliability, same pinout and command set; supports identical 2.3V–3.6V range and 104 MHz operation | Recommended for new designs; offers improved data retention and extended temperature margin over AT25SF081-SSHF-T | Select AT25SF081B-SSHF-T for production ramp; AT25SF081-SSHF-T remains viable for legacy BOM continuity |
| W25Q80DVSSIQ | 8-Mbit SPI flash with Quad I/O, but uses different status register layout and lacks dedicated security register pages | Requires firmware adaptation for QE bit handling and has no hardware-locked security storage | Use W25Q80DVSSIQ only if security register functionality is not required and existing driver supports Winbond command set |
Compared with AT25SF081-SSHF-T, the AT25SF081B-SSHF-T provides direct drop-in replacement with lifecycle assurance, while W25Q80DVSSIQ trades security register capability for broader ecosystem support-making the former ideal for long-lifecycle industrial designs and the latter better suited for cost-sensitive, high-volume consumer applications.
Availability
AT25SF081-SSHF-T is available at Aetrix Electronics and suitable for firmware boot storage, industrial data logging, and medical device calibration requiring stable component supply and long-term obsolescence management.
Supply support for AT25SF081-SSHF-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 and now delivers its high-performance serial flash portfolio under the Dialog brand, focusing on low-power, secure, and industrial-grade memory solutions.
The AT25SF081-SSHF-T belongs to Dialog's Adesto-branded serial flash product line, engineered specifically for embedded systems needing robust code+data storage with hardware security and multi-voltage compatibility.
FAQ
What is the operating voltage range of the AT25SF081-SSHF-T?
The AT25SF081-SSHF-T operates from a single supply of 2.3V to 3.6V. This range ensures compatibility with both 2.5V and 3.3V system rails, and operation outside this window may produce spurious results. The AT25SF081-SSHF-T does not support 1.8V operation or dual-supply configurations.
Does the AT25SF081-SSHF-T support Quad-I/O read mode?
Yes, the AT25SF081-SSHF-T supports Quad-I/O Read using opcode EBh, provided the Quad Enable (QE) bit in the Status Register is set. It uses SI, SO, WP, and HOLD as I/O0–I/O3 to deliver 4 bits per clock cycle, achieving up to 104 MHz operation with two dummy bytes after address input.
How many erase block sizes does the AT25SF081-SSHF-T support?
The AT25SF081-SSHF-T supports four uniform erase granularities: 256-byte page, 4-Kbyte block, 32-Kbyte block, and 64-Kbyte block, plus full chip erase. This architecture allows precise allocation of code and data segments without memory waste, unlike fixed-large-block alternatives.
Is the AT25SF081-SSHF-T pin-compatible with the AT25SF081B-SSHF-T?
Yes, the AT25SF081-SSHF-T is pin-compatible and functionally compatible with the AT25SF081B-SSHF-T. Both use identical 8-lead SOIC-208 packaging, share the same pinout, command set, and electrical specifications, making the AT25SF081B-SSHF-T a direct drop-in replacement with enhanced reliability.
What is the purpose of the three security register pages in the AT25SF081-SSHF-T?
The AT25SF081-SSHF-T includes three dedicated, individually lockable security register pages used for storing unique device serialization, electronic serial numbers (ESN), or cryptographic keys. Each page can be permanently locked via hardware (WP pin) or software, ensuring tamper resistance for critical firmware or calibration data.
AT25SF081-SSHF-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not 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:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25SF081-SSHF-T FAQ
1.How can I place an order for AT25SF081-SSHF-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25SF081-SSHF-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-SSHF-T reliable?
The price and inventory of AT25SF081-SSHF-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-SSHF-T is usually 5 days.
3.What payment methods are accepted for AT25SF081-SSHF-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25SF081-SSHF-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25SF081-SSHF-T?
AT25SF081-SSHF-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25SF081-SSHF-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-SSHF-T?
For technical support, including AT25SF081-SSHF-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25SF081-SSHF-T requirements.
6.How does Aetrix verify that AT25SF081-SSHF-T is sourced from the original manufacturer or authorized distributors?
All AT25SF081-SSHF-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-SSHF-T meets industry standards.
7.What is the process for return or replacement of AT25SF081-SSHF-T?
All AT25SF081-SSHF-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25SF081-SSHF-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-SSHF-T part is unused and in its original packaging.
Return procedure for AT25SF081-SSHF-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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