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Renesas AT25SF081B-SHB-T
- Part No.:
- AT25SF081B-SHB-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25SF081B-SHB-T.pdf
- Description:
- IC FLASH 8MBIT SPI/QUAD 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:40,269
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Product details
Overview
AT25SF081B-SHB-T 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- 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 -40°C to +85°C industrial temperature range.
For engineers reviewing the AT25SF081B-SHB-T datasheet, AT25SF081B-SHB-T pinout, AT25SF081B-SHB-T application, or AT25SF081B-SHB-T equivalent, key selection considerations include XiP support via continuous quad-I/O read (0-4-4), flexible memory protection using WP pin and status register bits, OTP security registers, SFDP compliance, and dual supply options (2.5–3.6 V / 2.7–3.6 V).
Technical Context
The AT25SF081B-SHB-T implements a SPI-compatible interface with hardware-selectable modes (0 and 3), enabling high-speed command/data transfer via SI/SO pins in standard mode or I/O0–I/O3 in dual/quad configurations. Its internal architecture includes a 2 Mbit physical block structure, SRAM data buffer, and Y/X-decoder logic optimized for fast random and sequential access.
Quad-I/O operation requires Status Register 2's QE bit to be set, reassigning WP and HOLD pins as I/O2 and I/O3; write protection remains active only when QE = 0 and SRP1/SRP0 = 0/1. Erase suspend/resume functionality allows background operations without halting host communication.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 8 M-bit (1 MByte) - sufficient for firmware images, configuration tables, and boot code in resource-constrained microcontrollers. |
| Max Clock Frequency | 108 MHz - enables sub-100 ns effective read latency in quad-I/O mode, critical for XiP performance. |
| Read Command Modes | Supports 1-1-2, 1-1-4, 1-4-4, and 0-4-4 - 0-4-4 eliminates opcode overhead for burst reads, improving throughput in streaming applications. |
| Erase Granularity | 4 kB sector / 32 kB & 64 kB blocks / full chip - allows precise firmware update partitioning without disturbing adjacent code or data regions. |
| Endurance & Retention | 100,000 program/erase cycles / 20-year data retention - meets long-life requirements for industrial controllers and medical devices. |
| Supply Voltage Range | 2.5 V–3.6 V or 2.7 V–3.6 V - compatible with both 2.5 V and 3.3 V system rails, simplifying power domain design. |
| Standby Current | 13.3 µA (typ) - minimizes quiescent power in battery-backed or always-on edge nodes. |
Pinout & Package
AT25SF081B-SHB-T is packaged in an 8-lead SOIC (208-mil wide), per ordering code suffix "-SHB-T". Pin functions are electrically defined and validated per Renesas DS-AT25SF081B-189 Rev. H.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must transition low-to-high after each command sequence to complete internal operations before entering standby. |
| SCK | Serial Clock | Master-generated clock; rising edge latches input (SI/I/O0), falling edge clocks output (SO/I/O1); timing-critical for 108 MHz operation. |
| SI (I/O0) | Serial Input / Quad I/O Lane 0 | Primary command/address/data input; becomes bidirectional I/O0 during dual/quad reads - requires pull-up if unused in quad mode. |
| SO (I/O1) | Serial Output / Quad I/O Lane 1 | Data output in standard mode; becomes bidirectional I/O1 in dual/quad reads - high-impedance when CS is deasserted. |
| WP (I/O2) | Write Protect / Quad I/O Lane 2 | Hardware write lock for status registers when QE = 0; repurposed as I/O2 when QE = 1 - cannot serve both roles simultaneously. |
| HOLD (I/O3) | Communication Hold / Quad I/O Lane 3 | Pauses ongoing SPI transaction without resetting state; becomes I/O3 in quad mode - internally pulled high, safe to float if unused. |
| VCC | Power Supply | 2.5–3.6 V nominal; decoupling capacitor required within 1 cm of pin to maintain signal integrity at 108 MHz. |
| GND | Ground Reference | System ground return path; must be low-impedance and routed separately from digital noise sources. |
Key Features
| Feature | Design Value |
|---|---|
| Execute-in-Place (XiP) Support | Enabled via 0-4-4 continuous quad-I/O read mode - eliminates instruction fetch latency by removing opcode transmission overhead per burst. |
| Flexible Memory Protection | User-definable protected region at memory start/end, controlled via WP pin and SRP bits - prevents accidental firmware overwrite during field updates. |
| OTP Security Registers | Three 256-byte one-time programmable registers - store cryptographic keys or device-specific identifiers with irreversible write capability. |
| Serial Flash Discoverable Parameters (SFDP) | Standardized JEDEC SFDP v1.6 register (5Ah command) - enables automatic driver configuration without hard-coded timing parameters. |
| Erase/Program Suspend & Resume | Allows host to pause long erase cycles (e.g., 200 ms block erase) to service time-critical interrupts, then resume without data loss. |
Applications
| Industrial PLC Firmware Storage | IoT Edge Node Configuration |
|---|---|
Use Scenario: Storing ladder logic firmware and runtime configuration in programmable logic controllers operating continuously in factory environments. IC Role / Device Role / Timing Role: Non-volatile boot memory and XiP execution target for ARM Cortex-M7 microcontrollers. Use Value: 20-year data retention and 100,000-cycle endurance ensure firmware integrity over 10+ years of unattended operation without refresh. |
Use Scenario: Holding sensor calibration data, network credentials, and OTA update staging area in battery-powered smart meters and environmental monitors. IC Role / Device Role / Timing Role: Low-power configuration store interfaced to ESP32 or Nordic nRF52840 via quad-SPI. Use Value: 1.2 µA deep power-down current extends battery life beyond 5 years; SFDP simplifies driver portability across firmware versions. |
| Medical Diagnostic Device Boot Code | Automotive Infotainment System Assets |
Use Scenario: Hosting bootloader and safety-critical application code in portable ultrasound or ECG units requiring regulatory-compliant firmware persistence. IC Role / Device Role / Timing Role: Primary boot source for Cortex-R5F SoC with hardware ECC and secure boot chain integration. Use Value: Dual voltage support (2.5 V/3.3 V) matches mixed-voltage SoC power domains; OTP registers store device-unique cryptographic keys for secure boot. |
Use Scenario: Caching UI assets, voice recognition models, and map tiles in head-unit systems where rapid GUI response is essential. IC Role / Device Role / Timing Role: High-bandwidth XiP memory accessed via 108 MHz quad-I/O to reduce UI rendering latency. Use Value: 0-4-4 continuous read mode achieves >40 MB/s effective throughput - sufficient for real-time video overlay and audio streaming buffers. |
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, no 0-4-4 mode, lacks OTP registers and SFDP v1.6 compliance. | Supports basic XiP but not continuous quad-I/O; lower security assurance for key storage. | Select when cost sensitivity outweighs XiP optimization and cryptographic key requirements. |
| Micron MT25QL80ABB8E12-0SIT | 8 M-bit, 133 MHz max clock, supports 0-4-4 and SFDP v1.6, includes 3×256-byte OTP, but requires 2.7–3.6 V only (no 2.5 V option). | Better raw speed and identical XiP/security features, but incompatible with 2.5 V logic domains. | Select when system uses 3.3 V exclusively and demands maximum read bandwidth. |
Compared with W25Q80DVSSIG and MT25QL80ABB8E12-0SIT, the AT25SF081B-SHB-T uniquely combines dual-voltage operation, 0-4-4 XiP acceleration, and OTP-based key storage - making it optimal for mixed-rail industrial and medical designs requiring long-term firmware integrity and secure boot.
Availability
AT25SF081B-SHB-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, IoT edge node configuration, medical diagnostic device boot code, and automotive infotainment system assets requiring stable component supply across multi-year production cycles.
Supply support for AT25SF081B-SHB-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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, power, and memory solutions for industrial, automotive, and enterprise markets.
The AT25SF081B belongs to Renesas' AT25SF family of SPI flash memories engineered for robustness in extended-temperature industrial applications and secure, high-performance XiP execution in resource-constrained embedded systems.
FAQ
What is the primary function of the AT25SF081B-SHB-T in embedded systems?
The AT25SF081B-SHB-T serves as a high-reliability SPI serial flash memory for storing boot code, firmware images, and configuration data. It enables execute-in-place (XiP) operation via quad-I/O modes, allowing microcontrollers to run code directly from flash without copying to RAM - reducing startup time and memory footprint. Its 8 M-bit capacity, 100,000-cycle endurance, and -40°C to +85°C rating make it ideal for industrial and medical embedded systems where long-term data integrity is critical. The AT25SF081B-SHB-T integrates features like SFDP and OTP registers to simplify driver development and enhance security.
Does the AT25SF081B-SHB-T support true execute-in-place (XiP) operation?
Yes, the AT25SF081B-SHB-T supports hardware-accelerated XiP through its 0-4-4 quad-I/O continuous read mode, which eliminates the need to resend command opcodes during burst reads. This reduces bus overhead and enables sustained high-throughput instruction fetches directly from flash memory. Combined with 108 MHz clock support and low-latency access timing, the AT25SF081B-SHB-T delivers deterministic performance for Cortex-M and R-series microcontrollers executing code in place. Its memory protection and OTP registers further ensure firmware authenticity and integrity during XiP operation.
How does the WP pin function on the AT25SF081B-SHB-T?
The WP (Write Protect) pin on the AT25SF081B-SHB-T operates in two mutually exclusive modes: as a hardware write-lock for status registers when Quad Enable (QE) = 0 and SRP1/SRP0 = 0/1, or as I/O2 in quad-SPI commands when QE = 1. In protection mode, pulling WP low prevents modification of status bits controlling memory locking. In quad mode, it becomes an active bidirectional data lane - meaning the pin cannot provide write protection while quad-I/O is enabled. The AT25SF081B-SHB-T's dual-role pin design requires careful configuration sequencing during initialization to avoid functional conflict.
What package type does the AT25SF081B-SHB-T use, and what are its dimensions?
The AT25SF081B-SHB-T uses an 8-lead, 208-mil wide SOIC (Small Outline Integrated Circuit) package, as indicated by the "-SHB-T" ordering suffix. Its body dimensions are 5.3 mm × 5.3 mm × 1.75 mm (L × W × H), with 1.27 mm lead pitch and gull-wing leads. This JEDEC-standard package offers mechanical robustness and thermal performance suitable for reflow soldering in industrial PCB assemblies. It is pin-compatible with other 8-lead SOIC flash devices but requires verification of footprint land patterns against Renesas' packaging drawing PS0001-A (Rev. 1.0) for reliable manufacturability. The AT25SF081B-SHB-T does not use UDFN or die form variants.
Can the AT25SF081B-SHB-T be used in battery-powered applications?
Yes, the AT25SF081B-SHB-T is well-suited for battery-powered applications due to its ultra-low power states: 13.3 µA typical standby current and 1.2 µA typical deep power-down current. Its dual supply range (2.5–3.6 V or 2.7–3.6 V) accommodates declining battery voltages across discharge cycles. The deep power-down mode (entered via B9h command) retains memory contents while minimizing energy draw - extending operational life in wireless sensors and portable diagnostics. Additionally, fast page programming (0.4 ms typ) and suspend/resume capability allow efficient background writes without prolonged active periods. For such use cases, the AT25SF081B-SHB-T delivers verified low-power performance without sacrificing XiP capability or security features.
AT25SF081B-SHB-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:
- 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:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25SF081B-SHB-T FAQ
1.How can I place an order for AT25SF081B-SHB-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25SF081B-SHB-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-SHB-T reliable?
The price and inventory of AT25SF081B-SHB-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-SHB-T is usually 5 days.
3.What payment methods are accepted for AT25SF081B-SHB-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25SF081B-SHB-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25SF081B-SHB-T?
AT25SF081B-SHB-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25SF081B-SHB-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-SHB-T?
For technical support, including AT25SF081B-SHB-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25SF081B-SHB-T requirements.
6.How does Aetrix verify that AT25SF081B-SHB-T is sourced from the original manufacturer or authorized distributors?
All AT25SF081B-SHB-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-SHB-T meets industry standards.
7.What is the process for return or replacement of AT25SF081B-SHB-T?
All AT25SF081B-SHB-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25SF081B-SHB-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-SHB-T part is unused and in its original packaging.
Return procedure for AT25SF081B-SHB-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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