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Renesas AT25SF081B-SHD-T
- Part No.:
- AT25SF081B-SHD-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25SF081B-SHD-T.pdf
- Description:
- IC FLASH 8MBIT SPI/QUAD 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:11,856
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Product details
Overview
AT25SF081B-SHD-T from Renesas Electronics is an 8 M-bit SPI serial flash memory IC designed for embedded code storage and execute-in-place (XiP) applications. It supports dual- and quad-I/O operations (1-1-2, 1-1-4, 1-4-4, 0-4-4), operates up to 108 MHz, delivers 13.3 µA standby current, and features 4 kB sector erase (60 ms typ), 100,000 program/erase cycles, and industrial temperature range (–40°C to +85°C).
For engineers reviewing the AT25SF081B-SHD-T datasheet, AT25SF081B-SHD-T pinout, AT25SF081B-SHD-T application, or AT25SF081B-SHD-T equivalent, key selection criteria include XiP support via continuous quad-I/O read (0-4-4), flexible protection with WP pin and OTP security registers, low-power deep power-down (1.2 µA), and JEDEC-standard SFDP register compatibility.
Technical Context
The AT25SF081B-SHD-T implements a multi-level erase architecture-4 kB sectors, 32/64 kB blocks, and full-chip-with dedicated command sets (20h/52h/D8h/60h) and suspend/resume capability (75h/7Ah). Its interface logic supports SPI modes 0 and 3, with configurable I/O pin roles (SI/SO/WP/HOLD as I/O0–I/O3) controlled by the Quad Enable bit in Status Register 2.
Memory access leverages burst wrap addressing (8/16/32/64-byte), fast read at 108 MHz, and dual/quad output timing optimized for minimal latency in boot and firmware update sequences. The internal SRAM data buffer and Y-gating architecture enable efficient page programming (1–256 bytes) with 0.4 ms typical time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 8 M-bit (1 MByte) - sufficient for MCU boot code, firmware images, and configuration data in space-constrained designs. |
| Max Clock Frequency | 108 MHz - enables high-throughput read operations critical for XiP performance and rapid firmware loading. |
| Erase Granularity | 4 kB sector / 32 kB block / 64 kB block / full chip - allows selective firmware updates without disturbing adjacent code or data sections. |
| Program Endurance | 100,000 cycles - supports field firmware upgrades over product lifetime in industrial and automotive ECUs. |
| Data Retention | 20 years - ensures long-term reliability of stored calibration data, security keys, and boot parameters. |
| Supply Voltage | 2.5 V – 3.6 V - compatible with modern low-voltage SoCs and battery-powered IoT nodes without level-shifting. |
| Deep Power-Down Current | 1.2 µA - extends battery life in always-on sensor nodes and wearable devices during idle periods. |
Pinout & Package
AT25SF081B-SHD-T is packaged in an 8-lead SOIC (208-mil wide), per ordering code suffix "-SHD-T". Pin functions are fully defined in Renesas DS-AT25SF081B-189 Rev. H.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must transition high-to-low to initiate commands and low-to-high to terminate operations; requires external 10 kΩ pull-up to VCC for reliable power-up sequencing. |
| SCK | Serial Clock | Master-generated clock; rising edge latches input (SI/I/O0), falling edge clocks out output (SO/I/O1); defines timing for all SPI transactions. |
| SI (I/O0) | Serial Input / Quad I/O 0 | Primary command/address/data input; becomes bidirectional I/O0 during dual/quad read modes; ignored when CS is high. |
| SO (I/O1) | Serial Output / Quad I/O 1 | Primary data output; becomes bidirectional I/O1 during dual/quad read modes; high-impedance when CS is deasserted. |
| WP (I/O2) | Write Protect / Quad I/O 2 | Configurable: hardware write-protection when QE=0 and SRP bits set; or I/O2 in quad mode when QE=1; internally pulled high. |
| HOLD (I/O3) | Hold / Quad I/O 3 | Pauses ongoing SPI transfer without resetting state when QE=0; serves as I/O3 in quad mode when QE=1; internally pulled high. |
| VCC | Power Supply | 2.5–3.6 V supply; powers core logic and I/O buffers; decoupling capacitor required per layout guidelines. |
| GND | Ground Reference | System ground return path; must be low-impedance and connected directly to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Quad-I/O Execute-in-Place (XiP) | Enables direct CPU execution from flash via 0-4-4 command format, eliminating need for opcode retransmission and reducing instruction fetch latency. |
| Serial Flash Discoverable Parameters (SFDP) | JEDEC-standard register (5Ah) provides host with programmable, versioned memory topology and timing parameters-enabling automatic driver initialization. |
| Three 256-byte OTP Security Registers | Immutable storage for cryptographic keys, device IDs, or secure boot hashes; erased only via dedicated 44h command and programmed with 42h. |
| User-Definable Memory Protection | Software- or hardware-configurable lock on top/bottom memory regions using Status Register bits and WP pin, preventing accidental overwrite of boot code or calibration data. |
| Erase/Program Suspend & Resume | Allows interruption of long-duration erase (up to 3 s) or program operations to service higher-priority host requests, then resume without data loss. |
Applications
| Industrial PLC Firmware Storage | Automotive ADAS Boot Memory |
|---|---|
Use Scenario: Storing firmware and configuration data for programmable logic controllers operating in harsh factory environments with wide temperature swings. IC Role / Device Role / Timing Role: Non-volatile code storage with execute-in-place capability, enabling deterministic boot and real-time task scheduling without RAM copy overhead. Use Value: 20-year data retention and –40°C to +85°C operation ensure firmware integrity across extended equipment lifecycles and thermal cycling. | Use Scenario: Holding boot code and safety-critical sensor fusion algorithms for camera/radar processing units in advanced driver assistance systems. IC Role / Device Role / Timing Role: High-speed XiP flash memory supporting 108 MHz quad-I/O reads to meet ASIL-B boot timing requirements under ISO 26262. Use Value: 4 kB sector erase enables atomic firmware patching without disrupting active safety functions during over-the-air updates. |
| IoT Edge Node Configuration | Medical Diagnostic Equipment Data Log |
Use Scenario: Storing device-specific calibration tables, network credentials, and OTA update staging area in battery-powered wireless sensors. IC Role / Device Role / Timing Role: Low-power serial flash with 1.2 µA deep power-down current and hardware write protection to preserve settings during multi-year deployments. Use Value: WP pin-based protection and OTP registers prevent unauthorized credential extraction or malicious firmware modification in unattended field installations. | Use Scenario: Archiving time-stamped diagnostic waveforms and patient metadata in portable ultrasound or ECG devices requiring regulatory-compliant data persistence. IC Role / Device Role / Timing Role: Reliable, high-endurance non-volatile memory for cyclic logging with guaranteed 100,000 program/erase cycles per sector. Use Value: Sector-erase granularity isolates log entries from firmware partitions, ensuring audit trail integrity even after repeated firmware updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Winbond W25Q80DVSSIG | Same density (8 M-bit), 3.3 V only (2.7–3.6 V), no 2.5 V option; lacks SFDP register and 0-4-4 XiP mode. | Supports standard quad-I/O but not continuous-read XiP; lower flexibility for ultra-low-latency boot scenarios. | Select when cost sensitivity outweighs XiP performance needs and 2.5 V operation is unnecessary. |
| Micron MT25QL80ABB8E12-0SIT | Identical voltage range (2.5–3.6 V), includes SFDP and 0-4-4 mode; rated for –40°C to +105°C, higher endurance (200k cycles). | Broadens thermal margin for under-hood automotive use; longer lifecycle for high-write medical or industrial logging. | Select when extended temperature range or doubled endurance justifies potential sourcing or qualification overhead. |
Compared with W25Q80DVSSIG and MT25QL80ABB8E12-0SIT, the AT25SF081B-SHD-T uniquely balances 2.5 V compatibility, 0-4-4 XiP, and integrated OTP security in a widely available SOIC package-making it optimal for cost-sensitive, space-constrained embedded systems requiring secure, low-power boot memory.
Availability
AT25SF081B-SHD-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive ADAS boot memory, and IoT edge node configuration requiring stable component supply and long-term manufacturability.
Supply support for AT25SF081B-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
Renesas Electronics is a global semiconductor leader delivering trusted microcontrollers, analog, power, and memory solutions for automotive, industrial, infrastructure, and IoT applications.
The AT25SF081B belongs to Renesas' serial flash memory product line, engineered specifically for robust, low-power, high-reliability code storage and execute-in-place operation in resource-constrained embedded systems.
FAQ
What is the maximum SPI clock frequency supported by the AT25SF081B-SHD-T?
The AT25SF081B-SHD-T supports a maximum SPI clock frequency of 108 MHz during fast read operations-including quad-output (6Bh) and quad-I/O (EBh, E7h) modes. This enables high-bandwidth data retrieval essential for execute-in-place (XiP) applications and rapid firmware loading in microcontroller-based systems. The 108 MHz rating is specified under standard 2.5–3.6 V supply and industrial temperature conditions per DS-AT25SF081B-189 Rev. H.
Does the AT25SF081B-SHD-T support execute-in-place (XiP) functionality?
Yes, the AT25SF081B-SHD-T explicitly supports execute-in-place (XiP) through its 0-4-4 command mode (EBh), which eliminates opcode transmission overhead and enables continuous quad-I/O reads. This feature allows host processors to fetch instructions directly from flash memory without intermediate RAM buffering-reducing boot time and system memory footprint. The AT25SF081B-SHD-T datasheet confirms XiP optimization via high-frequency operation, burst wrap addressing, and low-latency read timing.
How does the write protection mechanism work on the AT25SF081B-SHD-T?
The AT25SF081B-SHD-T implements dual-layer write protection: (1) hardware-based via the WP pin, which-when asserted low and configured with SRP0=1/SRP1=0-locks status registers and protected memory regions; and (2) software-configurable protection of top or bottom memory arrays using Status Register bits. Protection granularity is user-definable down to 4 kB sectors. The WP pin is internally pulled high and may be left floating if unused, simplifying board design.
What are the erase times for different block sizes on the AT25SF081B-SHD-T?
The AT25SF081B-SHD-T specifies typical erase times of 60 ms for 4 kB sectors (20h command), 120 ms for 32 kB blocks (52h), 200 ms for 64 kB blocks (D8h), and 3 seconds for full-chip erase (60h/C7h). These values are measured at VCC = 3.0 V and TA = 25°C per DS-AT25SF081B-189 Rev. H. Actual times may vary slightly across voltage and temperature ranges but remain within published limits for industrial-grade operation.
Does the AT25SF081B-SHD-T include security features beyond basic write protection?
Yes, the AT25SF081B-SHD-T integrates three 256-byte One-Time Programmable (OTP) security registers accessible via dedicated commands (42h/44h/48h). These registers provide immutable storage for cryptographic keys, unique device identifiers, or secure boot hashes. Once programmed, OTP contents cannot be altered-ensuring tamper-resistant identity and authentication capabilities critical for IoT and medical device security compliance.
AT25SF081B-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:
- Active
- 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:
- 108 MHz
- Write Cycle Time - Word, Page:
- 50µs, 2.4ms
- 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
AT25SF081B-SHD-T FAQ
1.How can I place an order for AT25SF081B-SHD-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25SF081B-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 AT25SF081B-SHD-T reliable?
The price and inventory of AT25SF081B-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 AT25SF081B-SHD-T is usually 5 days.
3.What payment methods are accepted for AT25SF081B-SHD-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25SF081B-SHD-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25SF081B-SHD-T?
AT25SF081B-SHD-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25SF081B-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 AT25SF081B-SHD-T?
For technical support, including AT25SF081B-SHD-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25SF081B-SHD-T requirements.
6.How does Aetrix verify that AT25SF081B-SHD-T is sourced from the original manufacturer or authorized distributors?
All AT25SF081B-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 AT25SF081B-SHD-T meets industry standards.
7.What is the process for return or replacement of AT25SF081B-SHD-T?
All AT25SF081B-SHD-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25SF081B-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 AT25SF081B-SHD-T part is unused and in its original packaging.
Return procedure for AT25SF081B-SHD-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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