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Renesas AT25SF081B-SSHB-B
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- Part No.:
- AT25SF081B-SSHB-B
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25SF081B-SSHB-B.pdf
- Description:
- IC FLASH 8MBIT SPI/QUAD 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:184,543
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Product details
Overview
AT25SF081B-SSHB-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, features 4 kB sector erase (60 ms typ), and delivers 13.3 µA standby current - enabling low-power, high-speed firmware access in industrial controllers and IoT edge nodes.
For engineers reviewing the AT25SF081B-SSHB-B datasheet, AT25SF081B-SSHB-B pinout, AT25SF081B-SSHB-B application, or AT25SF081B-SSHB-B equivalent, key selection criteria include quad-SPI XiP support, 2.5–3.6 V dual-voltage operation, deep power-down (1.2 µA), OTP security registers, and JEDEC-standard SFDP compliance for automatic configuration.
Technical Context
The AT25SF081B-SSHB-B implements a flexible SPI interface supporting modes 0 and 3, with configurable dual-output (1-1-2), dual-I/O (1-2-2), quad-output (1-1-4), and quad-I/O (1-4-4, 0-4-4) read protocols. Its architecture includes dedicated SRAM data buffers, Y/X decoders, and control logic enabling continuous read with 8/16/32/64-byte wrap - eliminating opcode retransmission overhead during sequential fetches.
Memory protection is enforced via non-volatile status register bits (SRP0/SRP1), hardware WP pin control, and user-definable protected regions at memory start or end. The device integrates three 256-byte One-Time Programmable (OTP) security registers and supports program/erase suspend-resume for real-time system responsiveness during background operations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory density | 8 M-bit (1 MByte) - sufficient for full MCU boot images and firmware overlays in resource-constrained systems. |
| Max clock frequency | 108 MHz - enables sub-100 ns effective read latency in quad-I/O mode, critical for XiP performance. |
| Erase granularity | 4 kB sectors / 32 kB & 64 kB blocks / full chip - allows fine-grained firmware updates without disturbing adjacent code/data. |
| Program time | 0.4 ms typical per 1–256 byte page - supports fast field firmware patching and parameter storage. |
| Power consumption | 13.3 µA standby / 1.2 µA deep power-down - extends battery life in always-on IoT sensors and wearables. |
| Data retention | 20 years - ensures long-term reliability for industrial equipment with 10+ year service lifecycles. |
| Endurance | 100,000 program/erase cycles - supports frequent OTA update deployments in connected devices. |
Pinout & Package
AT25SF081B-SSHB-B is supplied in an 8-lead SOIC (208-mil wide) package per JEDEC MS-012, with gull-wing leads and RoHS-compliant finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must transition high→low to initiate commands and low→high to terminate - controls device activation and standby entry timing. |
| SCK | Serial Clock | Master-generated clock; rising edge latches SI input, falling edge clocks SO output - defines SPI timing boundaries for all transactions. |
| SI (I/O0) | Serial Input / Quad I/O 0 | Command/address/data input in standard SPI; becomes bidirectional I/O0 in dual/quad modes - enables 1-, 2-, or 4-bit parallel data transfer per clock cycle. |
| SO (I/O1) | Serial Output / Quad I/O 1 | Data output in standard SPI; becomes bidirectional I/O1 in dual/quad modes - supports simultaneous 2- or 4-bit read bursts without bus turnaround delay. |
| WP (I/O2) | Write Protect / Quad I/O 2 | Hardware write lock when QE=0 and SRP=01; repurposed as I/O2 when QE=1 - provides physical security or expands quad bandwidth depending on configuration. |
| HOLD (I/O3) | Hold / Quad I/O 3 | Pauses ongoing SPI transfers without resetting SCK state when QE=0; becomes I/O3 in quad mode - enables deterministic interrupt handling during flash access. |
| VCC | Power Supply | 2.5–3.6 V operation - compatible with both 2.5 V and 3.3 V system rails, simplifying mixed-voltage board design. |
| GND | Ground Reference | System ground return path - requires low-impedance connection to minimize noise coupling into sensitive SPI signaling. |
Key Features
| Feature | Design Value |
|---|---|
| Quad-SPI XiP support | Enables direct CPU instruction execution from flash via 0-4-4 command mode, eliminating RAM copy overhead and reducing BOM cost. |
| Flexible memory protection | User-configurable protected zones at memory start/end + WP pin hardware lock - prevents accidental firmware corruption during field updates. |
| Three 256-byte OTP registers | Immutable storage for cryptographic keys, device IDs, or calibration data - ensures secure identity binding across product lifetime. |
| Serial Flash Discoverable Parameters (SFDP) | Standardized JEDEC register allowing host to auto-detect timing, voltage, and command set - eliminates hard-coded driver dependencies. |
| Erase/program suspend-resume | Allows immediate interruption of background erase/program by higher-priority reads - guarantees deterministic latency for real-time systems. |
Applications
| Industrial PLC Firmware Storage | IoT Edge Node Boot Memory |
|---|---|
|
Use Scenario: Storing and executing ladder logic firmware in programmable logic controllers with strict uptime requirements. IC Role / Device Role / Timing Role: Primary boot memory and XiP code store; delivers <100 ns effective read latency via 108 MHz quad-I/O mode. Use Value: Eliminates external RAM copy step, reduces boot time by 35% vs. standard SPI, and supports field-upgradable firmware with 4 kB sector granularity. |
Use Scenario: Hosting bootloader and sensor fusion firmware in battery-powered smart meters and environmental monitors. IC Role / Device Role / Timing Role: Low-power persistent memory with deep power-down (1.2 µA) and fast wake-up for intermittent sensing cycles. Use Value: Extends 2xAA battery life to >5 years while enabling secure OTA updates via OTP-protected keys and SFDP-automated timing adaptation. |
| Automotive Infotainment Bootloader | Medical Diagnostic Device Code Storage |
|
Use Scenario: Storing certified bootloader and safety-critical firmware in automotive head units requiring ASIL-B compliance. IC Role / Device Role / Timing Role: Secure, high-reliability code storage with 20-year data retention and 100K endurance for diagnostic software updates. Use Value: Meets AEC-Q100 Grade 3 (-40°C to +85°C) requirements and supports hardware write protection to prevent unauthorized modification. |
Use Scenario: Holding FDA-cleared firmware and calibration tables in portable ultrasound and ECG analyzers. IC Role / Device Role / Timing Role: Certified non-volatile memory with traceable manufacturing ID (9Fh command) and OTP-locked calibration constants. Use Value: Ensures regulatory auditability through unique ID readout and prevents calibration drift via immutable OTP storage of sensor coefficients. |
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 8 M-bit density, 104 MHz max clock, but lacks 0-4-4 continuous read mode and OTP registers. | Supports basic XiP but not optimized for ultra-low-latency instruction fetch; no hardware security key storage. | Choose for cost-sensitive designs where OTP and continuous-read XiP are not required. |
| Micron MT25QL80BA8ESF-0SIT | Identical 8 M-bit density, 133 MHz max clock, SFDP v1.6, and 1.8/3.3 V dual supply - but requires separate 1.8 V rail. | Better peak bandwidth but adds power rail complexity; supports octal DTR mode not available in AT25SF081B-SSHB-B. | Choose when maximum throughput justifies additional voltage regulation and layout overhead. |
Compared with W25Q80DVSSIG and MT25QL80BA8ESF-0SIT, the AT25SF081B-SSHB-B uniquely combines 0-4-4 continuous-read XiP, integrated OTP security, and single 2.5–3.6 V supply - delivering optimal balance of performance, security, and design simplicity for industrial and medical edge devices.
Availability
AT25SF081B-SSHB-B is available at Aetrix Electronics and suitable for industrial automation, IoT edge node development, and medical diagnostics equipment requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for AT25SF081B-SSHB-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 specializing in microcontrollers, analog, power, and memory solutions for industrial, automotive, and infrastructure markets.
The AT25SF081B-SSHB-B belongs to Renesas' AT25SF family of SPI flash memories engineered for high-reliability embedded boot and XiP applications - emphasizing low-power operation, security features, and seamless integration with Renesas MCUs and third-party SoCs.
FAQ
What voltage ranges does the AT25SF081B-SSHB-B support?
The AT25SF081B-SSHB-B supports two operating voltage ranges: 2.7 V to 3.6 V and 2.5 V to 3.6 V. This dual-voltage capability allows direct compatibility with both legacy 3.3 V systems and newer low-power 2.5 V designs without level-shifting circuitry, simplifying power architecture in mixed-signal embedded platforms.
Does the AT25SF081B-SSHB-B support execute-in-place (XiP) operation?
Yes, the AT25SF081B-SSHB-B explicitly supports XiP via its 0-4-4 quad-I/O continuous read mode, which eliminates opcode transmission overhead during sequential instruction fetches. This enables CPUs to execute code directly from flash with sub-100 ns effective latency at 108 MHz, reducing RAM footprint and boot time in AT25SF081B-SSHB-B-based systems.
How many One-Time Programmable (OTP) registers does the AT25SF081B-SSHB-B include?
The AT25SF081B-SSHB-B includes three 256-byte One-Time Programmable (OTP) security registers, accessible via dedicated commands (42h/44h/48h). These registers provide immutable storage for cryptographic keys, device identifiers, or calibration data - ensuring secure identity binding and tamper-resistant firmware integrity in AT25SF081B-SSHB-B deployments.
What is the purpose of the HOLD pin on the AT25SF081B-SSHB-B?
The HOLD pin on the AT25SF081B-SSHB-B pauses ongoing SPI transactions without resetting the clock sequence - enabling deterministic interrupt response during flash access. When QE=0, it functions as HOLD; when QE=1, it becomes I/O3 for quad-mode expansion. Its internal pull-up allows floating use if unused, simplifying PCB layout for AT25SF081B-SSHB-B designs.
Is the AT25SF081B-SSHB-B compliant with JEDEC Serial Flash Discoverable Parameters (SFDP)?
Yes, the AT25SF081B-SSHB-B implements JEDEC SFDP v1.5, accessible via command 5Ah. This standardized parameter table allows hosts to automatically detect supported commands, timing parameters, voltage ranges, and block protection schemes - eliminating hardcoded driver assumptions and improving interoperability across AT25SF081B-SSHB-B-based platforms.
AT25SF081B-SSHB-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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, 800µs
- 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-SSHB-B FAQ
1.How can I place an order for AT25SF081B-SSHB-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25SF081B-SSHB-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-SSHB-B reliable?
The price and inventory of AT25SF081B-SSHB-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-SSHB-B is usually 5 days.
3.What payment methods are accepted for AT25SF081B-SSHB-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25SF081B-SSHB-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25SF081B-SSHB-B?
AT25SF081B-SSHB-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25SF081B-SSHB-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-SSHB-B?
For technical support, including AT25SF081B-SSHB-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25SF081B-SSHB-B requirements.
6.How does Aetrix verify that AT25SF081B-SSHB-B is sourced from the original manufacturer or authorized distributors?
All AT25SF081B-SSHB-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-SSHB-B meets industry standards.
7.What is the process for return or replacement of AT25SF081B-SSHB-B?
All AT25SF081B-SSHB-B units undergo pre-shipment inspection (PSI). If there is an issue with AT25SF081B-SSHB-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-SSHB-B part is unused and in its original packaging.
Return procedure for AT25SF081B-SSHB-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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