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Renesas AT25SF081-SHF-T
- Part No.:
- AT25SF081-SHF-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25SF081-SHF-T.pdf
- Description:
- IC FLASH 8MBIT SPI/QUAD 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,496
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Product details
Overview
AT25SF081-SHF-T from Dialog Semiconductor (acquired Adesto) is an 8-Mbit SPI serial flash memory IC designed for code shadowing and data storage in consumer electronics. It operates from 2.3V–3.6V, supports SPI Modes 0/3, delivers 104 MHz max 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-SHF-T datasheet, AT25SF081-SHF-T pinout, AT25SF081-SHF-T application, or AT25SF081-SHF-T equivalent, this page provides verified technical context, real-world use cases, validated alternatives, and supply-chain support for industrial and embedded design-in.
Technical Context
The AT25SF081-SHF-T implements a flexible multi-granularity erase architecture with uniform 4-Kbyte, 32-Kbyte, 64-Kbyte, and full-chip erase blocks-optimized to minimize wasted space in mixed code+data applications. Its memory array is organized to allow independent placement of code modules and data segments in dedicated erase regions.
It supports four read modes: standard single-I/O (03h/0Bh), dual-output (3Bh), dual-I/O (BBh), and quad-output (6Bh) or quad-I/O (EBh), all requiring explicit Quad Enable (QE) bit setting for quad variants. All operations are controlled via SPI master interface using CS, SCK, SI, SO, WP, and HOLD pins with defined timing and state transitions.
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 systems. |
| Supply Voltage | 2.3V–3.6V; compatible with modern low-voltage microcontrollers and SoCs without level-shifting. |
| Max Clock Frequency | 104 MHz (quad/dual modes); enables high-throughput boot code loading and OTA update streaming. |
| Read Latency | 6 ns clock-to-output (tV); reduces wait states during instruction fetch and real-time data access. |
| Erase Granularity | Uniform 4/32/64-Kbyte blocks + full chip; allows precise field-upgrade of firmware sections without erasing entire image. |
| Endurance & Retention | 100,000 program/erase cycles; 20-year data retention; suitable for long-life industrial deployments. |
| Power Consumption | 2 µA deep power-down current; enables ultra-low-power sleep modes in battery-powered devices. |
Pinout & Package
AT25SF081-SHF-T is packaged in an 8-lead SOIC (208-mil) with gull-wing leads, RoHS-compliant, and rated for industrial temperature range (−40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; initiates all commands and places device in standby when deasserted. |
| SCK | Serial Clock | Master-generated clock; data latched on rising edge (input), output shifted on falling edge. |
| SI (I/O0) | Serial Input / Quad/Dual I/O | Command/address/data input in standard mode; becomes bidirectional I/O0 in dual/quad modes. |
| SO (I/O1) | Serial Output / Quad/Dual I/O | Data output in standard mode; becomes bidirectional I/O1 in dual/quad modes. |
| WP (I/O2) | Write Protect / Quad I/O | Hardware lock control for protected blocks; becomes I/O2 in quad-output/quad-I/O modes. |
| HOLD (I/O3) | Communication Hold / Quad I/O | Pauses ongoing SPI transfer without deselecting; becomes I/O3 in quad-output/quad-I/O modes. |
| VCC | Power Supply | 2.3V–3.6V core supply; powers internal logic, memory array, and I/O buffers. |
| GND | Ground Reference | System ground return path; required for stable operation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual/Quad Read Support | Enables 2× or 4× read bandwidth vs. standard SPI-critical for fast boot and high-speed data logging. |
| Flexible Erase Architecture | Four uniform block sizes eliminate over-erasure; improves memory utilization in mixed-code-and-data firmware partitions. |
| Security Register Pages | Three programmable, individually lockable pages for ESN, keys, or calibration data-no external secure element needed. |
| Low-Power Deep Power-Down | 2 µA typical current extends battery life in always-on IoT nodes and portable medical devices. |
| JEDEC ID Compliance | Standard manufacturer/device ID (9Fh) and legacy ID (90h) support automated BOM validation and factory programming. |
Applications
| Smart Home Hub Firmware Storage | Industrial PLC Configuration Memory |
|---|---|
Use Scenario: Storing boot firmware, OTA update images, and device-specific configuration in a Wi-Fi/BLE mesh hub. IC Role / Device Role / Timing Role: Nonvolatile code storage with fast read access and selective erase capability for incremental updates. Use Value: 104 MHz quad-read speed reduces boot time by >60% vs. legacy 50 MHz SPI flash; 4-Kbyte erase enables patch-level firmware updates. |
Use Scenario: Holding ladder logic programs, I/O mapping tables, and calibration coefficients in a DIN-rail mounted controller. IC Role / Device Role / Timing Role: Field-upgradable persistent memory with hardware write protection against accidental overwrite. Use Value: WP pin hardware locking prevents corruption during brown-out events; 20-year retention ensures 15+ year product lifecycle support. |
| Wearable Health Monitor Data Logger | Automotive Infotainment Boot Loader |
Use Scenario: Capturing sensor streams (ECG, SpO₂) between sync intervals in a rechargeable wrist-worn device. IC Role / Device Role / Timing Role: Low-power data buffer with deep power-down between sampling bursts. Use Value: 2 µA deep power-down current extends battery runtime to >7 days per charge; 32-Kbyte erase aligns with daily log partitioning. |
Use Scenario: Storing primary bootloader and fail-safe recovery image in a head-unit with ASIL-B functional safety requirements. IC Role / Device Role / Timing Role: Secure, high-reliability boot memory with programmable security registers for signature verification keys. Use Value: Three lockable security register pages store encrypted keys; 100K-cycle endurance supports lifetime diagnostic reprogramming. |
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-SHF-T | Successor with enhanced reliability, improved QE bit behavior, and updated qualification; same pinout and command set. | Recommended for new designs; supports identical use cases but with extended lifecycle and reduced risk of early obsolescence. | Select AT25SF081B-SHF-T for new projects; AT25SF081-SHF-T remains viable for legacy repair or continuity builds. |
| Winbond W25Q80DVSSIG | 8-Mbit SPI flash with quad I/O, 104 MHz max, 2.7–3.6V supply; lacks security register pages and 2.3V minimum operation. | Lower-cost alternative where security registers and wide voltage range are not required; requires VCC ≥2.7V. | Choose W25Q80DVSSIG only if system VCC is ≥2.7V and no secure key storage is needed. |
Compared with AT25SF081B-SHF-T, the AT25SF081-SHF-T offers identical functionality but lacks updated reliability screening and QE bit robustness; versus W25Q80DVSSIG, it adds 2.3V operation and hardware-secured registers at slightly higher cost and obsolescence risk.
Availability
AT25SF081-SHF-T is available at Aetrix Electronics and suitable for smart home hubs, industrial PLCs, wearable health monitors, and automotive infotainment systems requiring stable component supply across multi-year production cycles.
Supply support for AT25SF081-SHF-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 (now part of Renesas) is a fabless semiconductor company specializing in low-power mixed-signal ICs for mobile, IoT, and industrial applications.
The AT25SF081-SHF-T belongs to Dialog's Adesto-branded serial flash memory product line, engineered for high-density, low-voltage, and secure code+data storage in cost-sensitive, power-constrained embedded systems.
FAQ
What is the operating voltage range of the AT25SF081-SHF-T?
The AT25SF081-SHF-T operates from 2.3V to 3.6V. This wide low-voltage range allows direct interfacing with 2.5V and 3.3V microcontrollers without level shifters, and supports battery-powered systems down to 2.3V before brown-out reset. The AT25SF081-SHF-T maintains full functionality-including 104 MHz quad-read and 6 ns tV-across this entire range.
Does the AT25SF081-SHF-T support quad-I/O read mode?
Yes, the AT25SF081-SHF-T supports Quad-I/O Read (opcode EBh) at up to 104 MHz, but only after the Quad Enable (QE) bit in Status Register Byte 2 is set. In this mode, SI, SO, WP, and HOLD function as I/O3–I/O0, enabling four bits per clock cycle. The AT25SF081-SHF-T requires a mode byte and two dummy bytes after the address to initiate Quad-I/O Read.
How many erase block sizes does the AT25SF081-SHF-T support?
The AT25SF081-SHF-T supports four uniform erase granularities: 4-Kbyte, 32-Kbyte, 64-Kbyte blocks, and full chip erase. Each size is implemented as contiguous, non-overlapping sectors-for example, 256 × 4-Kbyte blocks or 32 × 64-Kbyte sectors. This eliminates partial-block waste and enables efficient firmware partitioning in the AT25SF081-SHF-T.
What is the purpose of the three security register pages in the AT25SF081-SHF-T?
The AT25SF081-SHF-T includes three dedicated, individually lockable 256-byte security register pages used for storing sensitive data such as electronic serial numbers (ESN), cryptographic keys, or calibration constants. Once locked via Write Protection instructions, these pages cannot be overwritten-even during full chip erase-ensuring persistent, tamper-resistant storage within the AT25SF081-SHF-T.
Is the AT25SF081-SHF-T pin-compatible with the AT25SF081B-SHF-T?
Yes, the AT25SF081-SHF-T is pin-compatible and command-set compatible with the AT25SF081B-SHF-T. Both share identical 8-lead SOIC (208-mil) packaging, identical pin functions (CS, SCK, SI, SO, WP, HOLD, VCC, GND), and identical instruction opcodes. However, the AT25SF081B-SHF-T is the recommended replacement due to enhanced reliability and updated qualification-making it the preferred choice for new designs involving the AT25SF081-SHF-T.
AT25SF081-SHF-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:
- 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-SHF-T FAQ
1.How can I place an order for AT25SF081-SHF-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25SF081-SHF-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-SHF-T reliable?
The price and inventory of AT25SF081-SHF-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-SHF-T is usually 5 days.
3.What payment methods are accepted for AT25SF081-SHF-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25SF081-SHF-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25SF081-SHF-T?
AT25SF081-SHF-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25SF081-SHF-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-SHF-T?
For technical support, including AT25SF081-SHF-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25SF081-SHF-T requirements.
6.How does Aetrix verify that AT25SF081-SHF-T is sourced from the original manufacturer or authorized distributors?
All AT25SF081-SHF-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-SHF-T meets industry standards.
7.What is the process for return or replacement of AT25SF081-SHF-T?
All AT25SF081-SHF-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25SF081-SHF-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-SHF-T part is unused and in its original packaging.
Return procedure for AT25SF081-SHF-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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