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Renesas AT25SF081-SSHD-T
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- Part No.:
- AT25SF081-SSHD-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25SF081-SSHD-T.pdf
- Description:
- IC FLASH 8MBIT SPI/QUAD 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,173
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Product details
Overview
AT25SF081-SSHD-T from Dialog Semiconductor (formerly Adesto) is an 8-Mbit serial flash memory IC with SPI interface, supporting Dual-I/O and Quad-I/O read modes, 104 MHz max clock frequency, 6 ns clock-to-output delay, and uniform 4/32/64-Kbyte block erase for code+data storage in embedded microcontroller systems.
For engineers reviewing the AT25SF081-SSHD-T datasheet, AT25SF081-SSHD-T pinout, AT25SF081-SSHD-T application, or AT25SF081-SSHD-T equivalent, key selection criteria include SPI Mode 0/3 compatibility, hardware write protection via WP pin, deep power-down current (2 µA), security register programmability, and SOIC-8 (150-mil) package suitability for space-constrained industrial PCBs.
Technical Context
The AT25SF081-SSHD-T implements a flexible erase architecture with four granular erase levels-256-byte page, 4-Kbyte block, 32-Kbyte block, and full-chip-enabling efficient co-location of firmware code and runtime data without memory waste. Its dual/quad I/O read modes use SI/SO/WP/HOLD as bidirectional I/O pins under command control, not fixed-direction signals.
It integrates three programmable security register pages for device serialization or ESN storage, each individually lockable via hardware-controlled WP pin or software commands. The status register includes a Quad Enable (QE) bit required to activate Quad-Output and Quad-I/O Read operations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 8 Mbit (1,048,576 bytes) - supports boot code shadowing and firmware updates in resource-limited MCUs. |
| Supply Voltage | 2.3 V – 3.6 V - compatible with 2.5 V and 3.3 V logic domains without level shifting. |
| Max Clock Frequency | 104 MHz - enables up to 52 MB/s effective throughput in Quad-I/O mode (4 bits/cycle). |
| Read Latency | 6 ns tV (clock-to-output) - minimizes wait states during XIP (execute-in-place) operation. |
| Erase Performance | 70 ms typical 4-Kbyte block erase - balances speed and endurance for frequent data logging. |
| Endurance & Retention | 100,000 program/erase cycles / 20 years data retention - meets industrial lifecycle requirements. |
| Power Consumption | 2 µA deep power-down current - enables ultra-low-power sleep modes in battery-operated devices. |
Pinout & Package
AT25SF081-SSHD-T is packaged in an 8-lead SOIC (150-mil body width, 1.27 mm pitch), RoHS-compliant, surface-mount format with standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select input | Active-low enable; rising edge terminates all operations and places SO/SI/WP/HOLD in high-Z state. |
| SCK | Serial clock input | Drives all timing; data latched on rising edge, output shifted on falling edge (SPI Modes 0/3). |
| SI (I/O0) | Serial input / Quad I/O | Command/address/data input; becomes I/O0 output in Dual/Quad Read modes for parallel data transfer. |
| SO (I/O1) | Serial output / Quad I/O | Data output in standard/Dual Read; becomes I/O1 output in Quad modes; high-Z when CS deasserted. |
| WP (I/O2) | Write protect / Quad I/O | Hardware lock for protected blocks; becomes I/O2 output in Quad Read; internally pulled-high. |
| HOLD (I/O3) | Communication pause / Quad I/O | Halts ongoing transfers without deselecting device; becomes I/O3 output in Quad Read; internally pulled-high. |
| VCC | Power supply | 2.3–3.6 V core and I/O supply; decoupling capacitor required per layout guidelines. |
| GND | Ground reference | System ground return path; must be low-impedance connection to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Dual/Quad I/O Read Support | Enables 2× or 4× read bandwidth vs. standard SPI, reducing firmware load time and improving XIP responsiveness. |
| Uniform Block Erase Architecture | 4/32/64-Kbyte erase blocks eliminate wasted space when storing independent code modules or data logs. |
| Three Security Register Pages | Individually lockable nonvolatile pages for secure device ID, calibration data, or encrypted keys-no external EEPROM needed. |
| Hardware Write Protection | WP pin provides immediate, glitch-immune locking of protected memory regions during power-up or brownout. |
| Deep Power-Down Mode | 2 µA standby current extends battery life in always-on sensors or IoT endpoints without sacrificing fast wake-up. |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot Memory |
|---|---|
Use Scenario: Storing firmware images and configuration parameters in programmable logic controllers operating across -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Primary nonvolatile boot memory mapped to MCU's external memory interface; executes code via XIP with ≤6 ns latency. Use Value: Uniform 4-Kbyte erase blocks allow field-upgradable function modules without erasing entire firmware; 20-year retention ensures long-term deployment integrity. | Use Scenario: Holding certified bootloader, safety-critical diagnostics, and calibrated sensor offsets in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage for regulatory-compliant firmware; security registers store cryptographic keys and device-specific certificates. Use Value: Hardware WP pin prevents accidental overwrite during power transitions; 100,000-cycle endurance supports repeated calibration updates over product lifetime. |
| Smart Meter Code + Data Log | Automotive Infotainment UI Assets |
Use Scenario: Concurrent storage of metering application code and time-stamped energy consumption logs in utility-grade smart meters. IC Role / Device Role / Timing Role: Dual-function memory partitioned into code region (64-Kbyte blocks) and log region (4-Kbyte blocks) for independent update cycles. Use Value: Optimized erase granularity avoids erasing multi-Kbyte firmware to append small log entries-reducing wear and extending flash lifetime. | Use Scenario: Caching graphical assets (icons, fonts, animations) and UI firmware in automotive head units requiring fast GUI rendering. IC Role / Device Role / Timing Role: High-speed Quad-I/O read memory interfaced to application processor's SPI controller for sub-100 ms UI asset loading. Use Value: 104 MHz clock support and 6 ns tV enable near-zero-latency asset streaming, eliminating UI stutter during navigation or media switching. |
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-SSHD-T | Direct successor with enhanced reliability, same pinout/package, identical command set, but not recommended for new designs per Dialog documentation. | Same industrial temperature range and security register functionality; improved ECC and endurance specs. | Select AT25SF081B-SSHD-T only for legacy design continuity where AT25SF081-SSHD-T is obsolete or unavailable. |
| Winbond W25Q80DVSSIQ | 8-Mbit SPI flash with Quad-I/O, 104 MHz, but uses different security register implementation and lacks HOLD pin functionality. | Compatible for basic code storage; not suitable where HOLD-assisted partial reads or Adesto-style security page locking is required. | Choose W25Q80DVSSIQ for cost-sensitive consumer applications where full feature parity is not mandatory. |
Compared with AT25SF081B-SSHD-T, the AT25SF081-SSHD-T offers identical pinout and command compatibility but lower endurance and no enhanced ECC; versus W25Q80DVSSIQ, it provides dedicated HOLD functionality and Adesto-specific security register behavior critical for regulated medical/industrial firmware.
Availability
AT25SF081-SSHD-T is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, smart metering systems, and automotive infotainment platforms requiring stable component supply and long-term lifecycle support.
Supply support for AT25SF081-SSHD-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 manages its ultra-low-power memory portfolio, including serial flash and conductive-bridging RAM products.
The AT25SF081-SSHD-T belongs to Adesto's AT25SF family of SPI flash memories, designed specifically for code+data co-storage in battery-powered and thermally constrained embedded systems.
FAQ
What is the operating voltage range for the AT25SF081-SSHD-T?
The AT25SF081-SSHD-T operates from 2.3 V to 3.6 V. This single-supply range ensures compatibility with both 2.5 V and 3.3 V system rails without external level shifters. Operation outside this range may cause data corruption or functional failure, and is not guaranteed by Dialog Semiconductor's specifications for the AT25SF081-SSHD-T.
Does the AT25SF081-SSHD-T support Quad-I/O read mode?
Yes, the AT25SF081-SSHD-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/O3–I/O0 to deliver 4 bits per clock cycle, achieving up to 52 MB/s effective throughput at 104 MHz. This capability is confirmed in the AT25SF081-SSHD-T datasheet Section 6.5.
How many security register pages does the AT25SF081-SSHD-T have?
The AT25SF081-SSHD-T contains three programmable security register pages, each 256 bytes in size. These pages support unique device serialization, ESN storage, and locked key management, and can be individually locked via hardware (WP pin) or software commands (42h/44h/48h). This feature is documented in the AT25SF081-SSHD-T datasheet Section 9.
What package type is used for the AT25SF081-SSHD-T?
The AT25SF081-SSHD-T uses an 8-lead SOIC package with 150-mil body width (MS-012AC), RoHS-compliant and halogen-free. Pin 1 is marked with a notch or dot; the footprint matches JEDEC standard dimensions and is compatible with reflow soldering per Dialog's assembly guidelines for the AT25SF081-SSHD-T.
Is the AT25SF081-SSHD-T still recommended for new designs?
No-the AT25SF081-SSHD-T is marked "Not recommended for new designs" in Dialog's official documentation, with AT25SF081B-SSHD-T designated as its functional successor. While AT25SF081-SSHD-T remains available for existing production, new designs should evaluate AT25SF081B-SSHD-T for improved reliability and extended lifecycle support per Dialog's AT25SF081-SSHD-T product notice.
AT25SF081-SSHD-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:
- 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-SSHD-T FAQ
1.How can I place an order for AT25SF081-SSHD-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25SF081-SSHD-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-SSHD-T reliable?
The price and inventory of AT25SF081-SSHD-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-SSHD-T is usually 5 days.
3.What payment methods are accepted for AT25SF081-SSHD-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25SF081-SSHD-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25SF081-SSHD-T?
AT25SF081-SSHD-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25SF081-SSHD-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-SSHD-T?
For technical support, including AT25SF081-SSHD-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25SF081-SSHD-T requirements.
6.How does Aetrix verify that AT25SF081-SSHD-T is sourced from the original manufacturer or authorized distributors?
All AT25SF081-SSHD-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-SSHD-T meets industry standards.
7.What is the process for return or replacement of AT25SF081-SSHD-T?
All AT25SF081-SSHD-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25SF081-SSHD-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-SSHD-T part is unused and in its original packaging.
Return procedure for AT25SF081-SSHD-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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