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Renesas AT25SF081B-SHD-B
- Part No.:
- AT25SF081B-SHD-B
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25SF081B-SHD-B.pdf
- Description:
- IC FLASH 8MBIT SPI/QUAD 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,679
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Product details
Overview
AT25SF081B-SHD-B from Renesas Electronics is an 8 M-bit SPI serial flash memory IC designed for embedded boot code storage and execute-in-place (XiP) applications. It supports dual/quad I/O read modes (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-B datasheet, AT25SF081B-SHD-B pinout, AT25SF081B-SHD-B application, or AT25SF081B-SHD-B 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), SFDP compliance, and JEDEC-standard device ID.
Technical Context
The AT25SF081B-SHD-B implements a unified SPI interface supporting modes 0 and 3, with configurable I/O width (single/dual/quad) controlled by Status Register 2's Quad Enable (QE) bit. Its memory array uses 4 kB sectors, 32/64 kB blocks, and full-chip erase - enabling granular firmware updates without disrupting adjacent code or configuration data.
Command execution leverages dedicated hardware acceleration: fast read operations use internal address wrap logic for continuous burst reads (8/16/32/64-byte), while program/erase suspend/resume enables real-time host interruption of background operations. Security is enforced via three 256-byte OTP registers and non-volatile status register protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 8 M-bit (1 MByte) - sufficient for boot loaders, firmware images, and configuration data in resource-constrained microcontrollers. |
| Max Clock Frequency | 108 MHz - enables high-throughput code fetch for XiP in real-time embedded systems. |
| Erase Time (Sector) | 60 ms typical - allows rapid field firmware patching at sector granularity without full reflash delays. |
| Page Program Time | 0.4 ms typical - supports efficient runtime parameter logging and over-the-air update staging. |
| Endurance & Retention | 100,000 cycles / 20 years - meets industrial lifecycle requirements for infrequently updated but mission-critical storage. |
| Supply Voltage Range | 2.5 V – 3.6 V - compatible with modern low-voltage SoCs and battery-powered edge devices. |
| Deep Power-Down Current | 1.2 µA typical - extends battery life in always-on IoT sensors and wearables during idle periods. |
Pinout & Package
AT25SF081B-SHD-B is packaged in an 8-lead SOIC (208-mil wide), with pins arranged as follows:
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select | Active-low enable signal; must transition high-to-low to initiate commands and low-to-high to terminate operations. |
| 2 SO (I/O1) | Serial Output / Quad I/O Line 1 | Outputs data on falling SCK edge; functions as I/O1 in dual/quad read modes for parallel bit transfer. |
| 3 WP (I/O2) | Write Protect / Quad I/O Line 2 | Configurable: protects status registers when QE=0; serves as I/O2 in quad mode when QE=1. |
| 4 GND | Ground Reference | System ground connection; required for stable voltage reference and noise immunity. |
| 5 VCC | Power Supply | 2.5–3.6 V supply input; internal regulation ensures consistent core voltage across operating range. |
| 6 HOLD (I/O3) | Hold Input / Quad I/O Line 3 | Pauses ongoing SPI transfers without resetting clock state; repurposed as I/O3 in quad mode when QE=1. |
| 7 SCK | Serial Clock | Master-generated clock; rising edge latches SI input, falling edge clocks SO output. |
| 8 SI (I/O0) | Serial Input / Quad I/O Line 0 | Latches command/address/data on rising SCK edge; becomes I/O0 in dual/quad read modes. |
Key Features
| Feature | Design Value |
|---|---|
| Quad I/O & XiP Support | Enables 0-4-4 continuous read mode - eliminates opcode overhead and doubles effective bandwidth vs standard SPI, critical for deterministic boot and real-time code execution. |
| Erase/Program Suspend | Allows host CPU to interrupt long-running erase or program cycles (e.g., during system diagnostics), then resume - preserving system responsiveness. |
| 3×256-byte OTP Security Registers | Stores immutable keys, calibration data, or device-specific identifiers - prevents cloning and supports secure boot chain integrity. |
| User-Definable Memory Protection | Configurable protected region at memory start/end via status register bits - safeguards bootloader or factory calibration data from accidental overwrite. |
| SFDP Compliance | Provides standardized, software-readable parameter table - enables automatic driver configuration and cross-vendor firmware portability. |
Applications
| Industrial PLC Firmware Storage | Automotive Infotainment Boot Memory |
|---|---|
Use Scenario: Storing and executing boot firmware and safety-critical control logic in programmable logic controllers with extended temperature operation. IC Role / Device Role / Timing Role: Primary non-volatile boot memory enabling XiP execution directly from flash, reducing RAM footprint and boot latency. Use Value: 108 MHz quad-I/O read speed and 4 kB sector erase allow sub-100ms firmware updates without halting machine control loops. |
Use Scenario: Hosting boot code and UI assets for head-unit systems requiring AEC-Q100-compliant components and robust ESD immunity. IC Role / Device Role / Timing Role: SPI-connected flash memory providing secure, fast-access storage for verified boot images and graphics resources. Use Value: 3×256-byte OTP registers store cryptographic keys for secure boot validation; deep power-down (1.2 µA) minimizes parasitic drain during vehicle sleep mode. |
| Medical Sensor Data Logger | Smart Home Gateway Configuration |
Use Scenario: Capturing calibrated sensor readings and diagnostic logs in portable medical devices with strict power budget constraints. IC Role / Device Role / Timing Role: Non-volatile storage for runtime parameters and event logs, leveraging page-program flexibility (1–256 bytes). Use Value: 0.4 ms page program time enables low-latency logging during transient events; 20-year data retention ensures regulatory compliance for long-term patient records. |
Use Scenario: Storing network credentials, firmware version metadata, and user preferences in Wi-Fi/Zigbee gateways deployed in residential environments. IC Role / Device Role / Timing Role: Configuration memory with hardware write protection (WP pin) to prevent corruption during OTA updates or brown-out conditions. Use Value: User-definable protected area prevents accidental overwrite of MAC addresses or encryption keys; SFDP support simplifies driver integration across multiple gateway SKUs. |
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), 104 MHz max clock, 2.7–3.6 V supply only; lacks 2.5 V support and 0-4-4 continuous read mode. | Compatible for basic SPI boot storage but not optimized for XiP latency-critical systems. | Select if cost sensitivity outweighs XiP performance and dual-voltage flexibility. |
| Micron MT25QL80ABB8E12-0SIT | 8 M-bit, 133 MHz max clock, 2.7–3.6 V, supports octal DTR mode; requires different command set and layout changes. | Higher bandwidth for advanced applications but incompatible pinout and initialization sequence. | Choose for future-proofing with higher-speed interfaces where redesign is acceptable. |
Compared with W25Q80DVSSIG and MT25QL80ABB8E12-0SIT, the AT25SF081B-SHD-B uniquely combines 2.5 V operation, 0-4-4 XiP mode, and integrated OTP security - making it optimal for low-power, secure, real-time embedded boot applications without layout revision.
Availability
AT25SF081B-SHD-B is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive infotainment boot memory, and medical sensor data logging requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AT25SF081B-SHD-B 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 embedded solutions for automotive, industrial, infrastructure, and IoT markets, with emphasis on reliability, security, and energy efficiency.
The AT25SF081B-SHD-B belongs to Renesas' AT25SF family of SPI flash memories engineered specifically for execute-in-place (XiP) and low-power embedded applications demanding fast read access, flexible erase granularity, and hardware-level security.
FAQ
What is the maximum operating frequency supported by the AT25SF081B-SHD-B?
The AT25SF081B-SHD-B supports a maximum SPI clock frequency of 108 MHz, achievable in quad-I/O read modes (1-4-4 and 0-4-4). This enables high-bandwidth code execution for XiP applications, significantly reducing instruction fetch latency compared to standard SPI flash devices limited to 80 MHz or lower. The 108 MHz rating is validated across the full industrial temperature range (–40°C to +85°C).
Does the AT25SF081B-SHD-B support execute-in-place (XiP) functionality?
Yes, the AT25SF081B-SHD-B explicitly supports XiP through its 0-4-4 continuous quad-I/O read command, which eliminates the need to retransmit opcodes between data bursts. Combined with 108 MHz operation and internal address wrap logic, this allows deterministic, low-latency instruction fetching directly from flash - essential for real-time embedded systems where external RAM footprint or boot time must be minimized.
How does memory protection work on the AT25SF081B-SHD-B?
The AT25SF081B-SHD-B provides two-tiered protection: (1) hardware-based write protection via the WP pin, configurable to lock status registers when SRP1/SRP0 = 0/1; and (2) user-definable protected memory regions at the start or end of the array, controlled by status register bits. Protection can be enabled/disabled without requiring VCC power cycling, and both mechanisms persist across power cycles due to non-volatile status register settings.
What are the package dimensions and lead count for the AT25SF081B-SHD-B?
The AT25SF081B-SHD-B is supplied in an 8-lead SOIC package with 208-mil width (5.29 mm × 5.29 mm × 2.34 mm body height). Pin pitch is 1.27 mm, and the package complies with JEDEC MS-012 standards. It is RoHS-compliant, halogen-free, and qualified for industrial temperature operation (–40°C to +85°C).
Can the AT25SF081B-SHD-B operate at 2.5 V supply voltage?
Yes, the AT25SF081B-SHD-B supports dual supply voltage ranges: 2.5 V – 3.6 V and 2.7 V – 3.6 V. Operation at 2.5 V enables compatibility with ultra-low-power microcontrollers and battery-powered edge devices, while maintaining full functionality including 108 MHz read speed, quad-I/O modes, and all protection/security features - unlike many competing flash devices that restrict features below 2.7 V.
AT25SF081B-SHD-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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, 800µs
- 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-B FAQ
1.How can I place an order for AT25SF081B-SHD-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25SF081B-SHD-B 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-B reliable?
The price and inventory of AT25SF081B-SHD-B 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-B is usually 5 days.
3.What payment methods are accepted for AT25SF081B-SHD-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25SF081B-SHD-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25SF081B-SHD-B?
AT25SF081B-SHD-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25SF081B-SHD-B 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-B?
For technical support, including AT25SF081B-SHD-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25SF081B-SHD-B requirements.
6.How does Aetrix verify that AT25SF081B-SHD-B is sourced from the original manufacturer or authorized distributors?
All AT25SF081B-SHD-B 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-B meets industry standards.
7.What is the process for return or replacement of AT25SF081B-SHD-B?
All AT25SF081B-SHD-B units undergo pre-shipment inspection (PSI). If there is an issue with AT25SF081B-SHD-B, 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-B part is unused and in its original packaging.
Return procedure for AT25SF081B-SHD-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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