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Renesas AT25SF081B-MAHD-T
- Part No.:
- AT25SF081B-MAHD-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
AT25SF081B-MAHD-T.pdf
- Description:
- IC FLASH 8MBIT SPI/QUAD 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:9,773
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Product details
Overview
AT25SF081B-MAHD-T from Renesas Electronics is an 8 M-bit SPI serial flash memory IC designed for embedded boot code and XiP (execute-in-place) applications. It supports dual I/O (1-2-2) and quad I/O (1-4-4, 0-4-4) read modes, operates up to 108 MHz, features 4 kB sector erase (60 ms typ), and delivers 1.2 µA deep power-down current. Used in industrial controllers and IoT edge nodes requiring fast, low-power nonvolatile storage.
For engineers reviewing the AT25SF081B-MAHD-T datasheet, AT25SF081B-MAHD-T pinout, AT25SF081B-MAHD-T application, or AT25SF081B-MAHD-T equivalent, this page provides verified electrical specs, validated SPI command support (including SFDP and XiP-enabling 0-4-4 continuous read), package mapping to 8-pin SOIC (208-mil wide), and real-world design guidance for secure firmware storage and boot acceleration.
Technical Context
The AT25SF081B-MAHD-T implements a flexible SPI interface with hardware-selectable dual/quad I/O operation via 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 active code regions.
It integrates three 256-byte OTP security registers, JEDEC-standard Manufacturer/Device ID, and Serial Flash Discoverable Parameters (SFDP) v1.6 for automatic host configuration. The HOLD and WP pins serve dual roles: as control signals (HOLD suspend, WP write protection) or as I/O2/I/O3 in quad mode - configurable only via status register bits, not hardwired.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 8 M-bit (1 MByte) - sufficient for full MCU boot images and parameter storage in space-constrained designs. |
| Max Clock Frequency | 108 MHz - enables high-throughput XiP execution and rapid firmware loading over SPI. |
| Erase Granularity | 4 kB sector / 32 kB block / 64 kB block / full chip - supports atomic OTA updates and isolated data logging. |
| Program Time | 0.4 ms typical per 256-byte page - balances speed and reliability for field firmware patching. |
| Power Consumption | 1.2 µA deep power-down current - extends battery life in always-on sensor nodes and wearables. |
| Data Retention | 20 years - meets long-lifecycle requirements for industrial automation and medical devices. |
| Endurance | 100,000 program/erase cycles - suitable for frequent logging or configuration storage. |
Pinout & Package
AT25SF081B-MAHD-T is packaged in an 8-lead, 208-mil wide EIAJ SOIC (JEDEC MS-012AC) with standard pinout and RoHS-compliant finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must transition high-to-low to initiate commands and low-to-high to terminate - critical for multi-device SPI bus arbitration. |
| SCK | Serial Clock | Master-generated clock; rising edge latches SI input, falling edge clocks SO output - timing governs max 108 MHz operation. |
| SI (I/O0) | Serial Input / Quad I/O Lane 0 | Primary command/address/data input; becomes bidirectional I/O0 in dual/quad modes - requires tristate control during SO output phases. |
| SO (I/O1) | Serial Output / Quad I/O Lane 1 | Standard output for single/dual reads; functions as I/O1 in quad mode - shares pin with dual-output functionality. |
| WP (I/O2) | Write Protect / Quad I/O Lane 2 | Hardware write lock when QE=0 and SRP=01; reconfigured as I/O2 when QE=1 - prevents accidental register modification during quad transfers. |
| HOLD (I/O3) | Communication Hold / Quad I/O Lane 3 | Pauses ongoing SPI transfer without resetting state; becomes I/O3 in quad mode - enables seamless context switching in real-time systems. |
| VCC | Supply Voltage | 2.5 V–3.6 V operation - compatible with modern 3.3 V and mixed-voltage SoC interfaces. |
| GND | Ground Reference | System ground return path - must be low-impedance to maintain signal integrity at 108 MHz. |
Key Features
| Feature | Design Value |
|---|---|
| Quad I/O with Continuous Read (0-4-4) | Eliminates opcode transmission overhead, enabling sustained high-bandwidth XiP execution without command reissuance. |
| Erase/Program Suspend & Resume | Allows foreground interrupt handling (e.g., sensor sampling) while background flash operations continue - essential for deterministic real-time response. |
| User-Definable Memory Protection | Configurable protected zones at memory start/end via WP pin or status register - secures bootloader and calibration data against corruption. |
| Three 256-byte OTP Security Registers | Stores immutable keys, device IDs, or cryptographic seeds - enables secure boot chain binding and anti-cloning measures. |
| SFDP v1.6 Compliance | Enables automatic host driver initialization of timing parameters, read commands, and voltage settings - reduces firmware integration effort. |
Applications
| Industrial PLC Firmware Storage | IoT Edge Node Boot Memory |
|---|---|
Use Scenario: Storing and executing ladder logic firmware in programmable logic controllers with cold-start reliability requirements. IC Role / Device Role / Timing Role: Primary boot memory providing XiP-capable instruction fetch directly to ARM Cortex-M7 core. Use Value: 108 MHz quad-I/O read and 0-4-4 continuous mode reduce boot time by >40% vs. legacy SPI flash, accelerating machine startup. |
Use Scenario: Hosting firmware and OTA update payload in battery-powered environmental sensors deployed in remote locations. IC Role / Device Role / Timing Role: Nonvolatile storage with ultra-low deep power-down (1.2 µA) to extend 10-year battery life. Use Value: Sector-erase granularity enables safe delta updates without erasing telemetry history - preserving data continuity across reboots. |
| Medical Diagnostic Device Configuration | Automotive ADAS Camera Module |
Use Scenario: Storing calibrated sensor offsets, user preferences, and regulatory audit logs in portable ultrasound units. IC Role / Device Role / Timing Role: Secure parameter storage using OTP registers and write-protected memory regions. Use Value: Three 256-byte OTP registers bind calibration data to hardware identity, preventing unauthorized recalibration or tampering. |
Use Scenario: Holding camera ISP firmware and lens correction tables in automotive surround-view systems operating at -40°C to +85°C. IC Role / Device Role / Timing Role: High-reliability code storage meeting AEC-Q100 Grade 3 temperature requirements. Use Value: 20-year data retention and 100K endurance ensure firmware integrity over vehicle lifetime, even with frequent firmware patches. |
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 continuous read mode; supports only 1-1-4 and 1-4-4. | Lacks XiP-optimized continuous read - higher CPU overhead during code execution from flash. | Choose when cost sensitivity outweighs XiP performance needs and existing Winbond driver stack is leveraged. |
| Micron MT25QL80BA8E12-0SIT | 8 M-bit, 133 MHz max clock, supports 0-4-4, but requires external VIO supply (1.7–2.0 V) for quad I/O - adds BOM complexity. | Higher speed potential but incompatible with single-supply 3.3 V systems without level-shifting. | Prefer when system already includes 1.8 V rail and maximum read bandwidth is critical for video buffer loading. |
Compared with W25Q80DVSSIG and MT25QL80BA8E12-0SIT, the AT25SF081B-MAHD-T uniquely combines 108 MHz operation, true 0-4-4 continuous read, single 2.5–3.6 V supply, and integrated OTP security - making it optimal for resource-constrained XiP designs requiring firmware integrity and low-power longevity.
Availability
AT25SF081B-MAHD-T is available at Aetrix Electronics and suitable for industrial PLCs, IoT edge nodes, medical diagnostics, and automotive ADAS modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AT25SF081B-MAHD-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 microcontrollers, analog, power, and memory solutions for automotive, industrial, and IoT markets.
The AT25SF081B belongs to Renesas' serial flash memory product line, engineered specifically for embedded boot and execute-in-place applications demanding high-speed, low-power, and secure nonvolatile storage.
FAQ
What is the maximum SPI clock frequency supported by the AT25SF081B-MAHD-T?
The AT25SF081B-MAHD-T supports a maximum SPI clock frequency of 108 MHz in quad I/O mode. This applies to both 1-4-4 and 0-4-4 read operations, enabling high-bandwidth data access for execute-in-place (XiP) execution. AC characteristics in the official datasheet confirm timing margins are validated up to this rate under 2.5–3.6 V supply and industrial temperature conditions.
Does the AT25SF081B-MAHD-T support execute-in-place (XiP) operation?
Yes, the AT25SF081B-MAHD-T is explicitly designed for XiP applications. Its support for 0-4-4 continuous read mode eliminates opcode transmission overhead, and its 108 MHz quad I/O capability ensures low-latency instruction fetch. The datasheet confirms XiP suitability in Section 1 (Product Overview) and highlights timing optimizations for direct code execution from flash memory.
How is memory protection implemented on the AT25SF081B-MAHD-T?
The AT25SF081B-MAHD-T implements memory protection via software-configurable status register bits (SRP0/SRP1) and hardware WP pin control. Users can define protected zones at the start or end of the memory array, with granularity down to 4 kB sectors. Protection is enforced during write/erase commands and remains active across power cycles when non-volatile bits are set - verified in Section 9 of the datasheet.
What package type does the AT25SF081B-MAHD-T use?
The AT25SF081B-MAHD-T uses an 8-lead, 208-mil wide EIAJ SOIC package (also referenced as MS-012AC). This is confirmed in the Ordering Information table (Page 55) and Packaging Information section (Page 57) of the datasheet. The "MAHD" suffix in the part number explicitly denotes this 208-mil SOIC variant.
Can the AT25SF081B-MAHD-T be used in automotive applications?
The AT25SF081B-MAHD-T is rated for industrial temperature range (–40°C to +85°C) and meets RoHS compliance, but it is not AEC-Q200 qualified. While functionally suitable for some automotive infotainment or body-control modules, Renesas does not certify it for safety-critical ADAS or powertrain applications. For automotive-grade use, consult Renesas' AEC-Q200-qualified serial flash portfolio.
AT25SF081B-MAHD-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-UFDFN Exposed Pad
- 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-UDFN (2x3)
AT25SF081B-MAHD-T FAQ
1.How can I place an order for AT25SF081B-MAHD-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25SF081B-MAHD-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-MAHD-T reliable?
The price and inventory of AT25SF081B-MAHD-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-MAHD-T is usually 5 days.
3.What payment methods are accepted for AT25SF081B-MAHD-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25SF081B-MAHD-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25SF081B-MAHD-T?
AT25SF081B-MAHD-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25SF081B-MAHD-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-MAHD-T?
For technical support, including AT25SF081B-MAHD-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25SF081B-MAHD-T requirements.
6.How does Aetrix verify that AT25SF081B-MAHD-T is sourced from the original manufacturer or authorized distributors?
All AT25SF081B-MAHD-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-MAHD-T meets industry standards.
7.What is the process for return or replacement of AT25SF081B-MAHD-T?
All AT25SF081B-MAHD-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25SF081B-MAHD-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-MAHD-T part is unused and in its original packaging.
Return procedure for AT25SF081B-MAHD-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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