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Renesas AT25SF081B-SHB-B
- Part No.:
- AT25SF081B-SHB-B
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25SF081B-SHB-B.pdf
- Description:
- IC FLASH 8MBIT SPI/QUAD 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,585
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Product details
Overview
AT25SF081B-SHB-B from Renesas Electronics is an 8 M-bit SPI serial flash memory IC supporting dual I/O and quad I/O operations, 108 MHz max clock frequency, 2.5–3.6 V supply, and execute-in-place (XiP) capability for embedded boot and code storage applications.
For engineers reviewing the AT25SF081B-SHB-B datasheet, AT25SF081B-SHB-B pinout, AT25SF081B-SHB-B application, or AT25SF081B-SHB-B equivalent, key selection factors include quad-SPI timing compliance (1-4-4/0-4-4), sector/block erase granularity (4 kB/32 kB/64 kB), OTP security registers, SFDP support, and low-power deep power-down mode (1.2 µA).
Technical Context
The AT25SF081B-SHB-B implements a flexible SPI interface with hardware-selectable modes (0/3), dual-output (1-1-2), dual-I/O (1-2-2), quad-output (1-1-4), and full quad-I/O (1-4-4, 0-4-4) read protocols. Its architecture integrates a 256-byte page buffer, Y/X-decoded flash array, and SRAM data buffer to enable high-throughput continuous reads with wrap.
Memory protection is implemented via status register-controlled non-volatile locking, user-definable protected regions at memory start/end, and WP pin assertion. Security is enhanced by three 256-byte OTP registers and unique ID read (4Bh), all accessible via dedicated command opcodes defined in JEDEC-standardized sequences.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 8 M-bit (1 MByte) - supports firmware images up to 1 MB in size for microcontroller boot storage. |
| Max Clock Frequency | 108 MHz - enables fast instruction fetch in XiP systems with sub-10 ns effective read latency per word. |
| Supply Voltage Range | 2.5 V – 3.6 V - compatible with modern low-voltage SoCs and battery-powered IoT devices. |
| Erase Time (Sector) | 60 ms typical (4 kB) - allows rapid field updates of configuration or calibration data without long downtime. |
| Program Time (Page) | 0.4 ms typical (up to 256 bytes) - supports efficient over-the-air (OTA) patching with minimal write latency. |
| Endurance & Retention | 100,000 cycles / 20 years - suitable for industrial logging, parameter storage, and infrequent firmware upgrades. |
| Deep Power-Down Current | 1.2 µA typical - extends battery life in always-on sensor nodes and wearable edge devices. |
Pinout & Package
AT25SF081B-SHB-B is supplied in an 8-lead SOIC package (208-mil wide, JEDEC standard). Pin functions are fully SPI-compatible with dual/quad I/O reconfiguration via Status Register 2 QE bit.
| 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-ensures deterministic SPI transaction framing. |
| SCK | Serial Clock | Master-generated clock; rising edge latches input (SI), falling edge clocks output (SO/I/Ox)-defines timing reference for all SPI modes. |
| SI (I/O0) | Serial Input / Quad I/O 0 | Primary command/address/data input; becomes bidirectional I/O0 during dual/quad reads-enables 1-, 2-, or 4-bit parallel data transfer per SCK cycle. |
| SO (I/O1) | Serial Output / Quad I/O 1 | Default data output; becomes bidirectional I/O1 in dual/quad mode-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; reconfigured as I/O2 when QE=1-prevents accidental status register modification during quad operation. |
| HOLD (I/O3) | Hold / Quad I/O 3 | Pauses ongoing SPI transfer without resetting state; becomes I/O3 in quad mode-enables multi-master arbitration and debug interrupt handling. |
| VCC | Power Supply | 2.5–3.6 V core supply; internal regulation ensures stable flash programming/erasing across voltage range. |
| GND | Ground Reference | Common return path for all I/O and core logic; requires low-impedance connection to minimize noise-induced read errors. |
Key Features
| Feature | Design Value |
|---|---|
| Quad-I/O Fast Read (1-4-4) | Enables 4-bit-per-cycle data throughput at 108 MHz, doubling bandwidth vs. standard SPI and reducing boot time by ~40% in XiP systems. |
| Continuous Read Mode (0-4-4) | Eliminates repeated opcode transmission during sequential access-reduces protocol overhead and improves effective read bandwidth by up to 25%. |
| Erase/Program Suspend & Resume | Allows background flash operations to be paused for higher-priority tasks (e.g., real-time interrupt handling) and resumed without data loss or timeout failure. |
| 3 × 256-byte OTP Security Registers | Provides immutable storage for cryptographic keys, device IDs, or calibration constants-resists software-based extraction and tampering attempts. |
| Serial Flash Discoverable Parameters (SFDP) | Standardized JEDEC register (5Ah) exposing erase sizes, timing, and feature flags-enables automatic driver initialization without hard-coded vendor tables. |
Applications
| Industrial PLC Firmware Storage | IoT Edge Device OTA Updates |
|---|---|
Use Scenario: Storing and executing ladder logic firmware in programmable logic controllers with cold-start reliability requirements. IC Role / Device Role / Timing Role: Boot memory providing XiP execution and secure firmware rollback via sector-protected image partitions. Use Value: 4 kB sector erase enables atomic firmware patching; 100K endurance ensures >10-year field upgrade cycles in unattended installations. | Use Scenario: Remote firmware validation and incremental update delivery to battery-powered environmental sensors. IC Role / Device Role / Timing Role: Dual-role storage for active firmware and staging area, managed via quad-I/O reads and page-program writes. Use Value: 1.2 µA deep power-down current extends 2xAA battery life beyond 5 years; SFDP simplifies cross-platform OTA driver porting. |
| Medical Diagnostic Instrument Boot Loader | Automotive Infotainment Code Storage |
Use Scenario: Hosting certified boot loader and diagnostic application binaries in Class II medical devices requiring traceable firmware integrity. IC Role / Device Role / Timing Role: Secure code repository with OTP-stored signature keys and hardware-enforced write protection on critical sectors. Use Value: Three 256-byte OTP registers store asymmetric keys for ECDSA verification; WP pin + status register lock prevents runtime corruption. | Use Scenario: Storing GUI assets, voice recognition models, and navigation map tiles in automotive head units with strict AEC-Q100 temperature compliance. IC Role / Device Role / Timing Role: High-bandwidth code/data memory supporting concurrent display rendering and audio decoding via quad-I/O burst reads. Use Value: 108 MHz quad-I/O read delivers >40 MB/s effective bandwidth-sufficient for real-time 720p video overlay and responsive UI rendering. |
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; lacks 0-4-4 continuous read mode and OTP registers. | Supports basic quad-I/O but no XiP-optimized continuous read; lower security assurance for key storage. | Preferred where cost sensitivity outweighs XiP performance and cryptographic key isolation needs. |
| Micron MT25QL80ABB8E12-0SIT | Identical 8 M-bit density, 133 MHz max clock, 2.7–3.6 V; includes SFDP v1.6 and deeper security (AES-256 encryption engine). | Offers hardware AES acceleration and enhanced security features not present in AT25SF081B-SHB-B. | Chosen when end-to-end encrypted firmware storage is required, accepting higher BOM cost and larger footprint. |
Compared with W25Q80DVSSIG and MT25QL80ABB8E12-0SIT, the AT25SF081B-SHB-B uniquely balances XiP-optimized 0-4-4 read efficiency, integrated OTP security, and ultra-low deep power-down current-making it optimal for resource-constrained, battery-aware, and firmware-integrity-critical embedded designs.
Availability
AT25SF081B-SHB-B is available at Aetrix Electronics and suitable for industrial PLC firmware storage, IoT edge device OTA updates, and medical diagnostic instrument boot loader applications requiring stable component supply and long-term lifecycle support.
Supply support for AT25SF081B-SHB-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.
The AT25SF081B belongs to Renesas' serial flash memory product line, engineered specifically for high-reliability, low-power, and execute-in-place (XiP) applications in space- and energy-constrained embedded systems.
FAQ
What is the maximum operating frequency supported by the AT25SF081B-SHB-B?
The AT25SF081B-SHB-B supports a maximum SPI clock frequency of 108 MHz across all read modes-including standard, dual-output, dual-I/O, quad-output, and quad-I/O. This specification is validated under 2.5–3.6 V supply and -40°C to +85°C ambient conditions, enabling high-speed firmware execution in XiP configurations. The AT25SF081B-SHB-B achieves this using optimized internal timing paths and low-latency I/O buffers.
Does the AT25SF081B-SHB-B support execute-in-place (XiP) functionality?
Yes, the AT25SF081B-SHB-B explicitly supports execute-in-place (XiP) through three hardware-optimized features: quad-SPI (1-4-4) for 4-bit-per-cycle instruction fetch, continuous read mode (0-4-4) eliminating opcode overhead, and 108 MHz maximum clock frequency. These capabilities reduce effective read latency and allow direct CPU execution from flash without copying to RAM-critical for memory-constrained microcontrollers. The AT25SF081B-SHB-B datasheet confirms XiP suitability in its Product Overview section.
How many and what type of security registers does the AT25SF081B-SHB-B include?
The AT25SF081B-SHB-B includes three 256-byte One-Time Programmable (OTP) security registers, accessible via dedicated commands (42h program, 48h read, 44h erase). These registers are physically fuse-based and cannot be reprogrammed after initial write-making them suitable for storing immutable cryptographic keys, device-specific identifiers, or calibration constants. The AT25SF081B-SHB-B datasheet specifies OTP behavior in Section 10 and Table 8–10.
What package options are available for the AT25SF081B-SHB-B?
The AT25SF081B-SHB-B is offered in three industry-standard packages: 8-lead SOIC (150-mil narrow), 8-lead SOIC (208-mil wide), and 8-pad Ultra-Thin UDFN (2 × 3 × 0.6 mm). The "-SHB-B" suffix specifically denotes the 208-mil wide SOIC variant. All packages comply with RoHS, Pb-free, and halide-free standards per JEDEC and IPC specifications. Pinouts and mechanical drawings are provided in Figures 1–2 and Section 16 of the AT25SF081B-SHB-B datasheet.
Can the AT25SF081B-SHB-B perform simultaneous read and write operations?
No, the AT25SF081B-SHB-B does not support true simultaneous read and write. However, it provides erase/program suspend and resume functionality (75h/7Ah commands), allowing an ongoing program or erase operation to be temporarily halted-enabling the host to service time-critical interrupts or perform short reads-then resumed without data corruption or timeout. This capability is documented in Sections 8.5–8.6 and Figure 22–23 of the AT25SF081B-SHB-B datasheet.
AT25SF081B-SHB-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:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25SF081B-SHB-B FAQ
1.How can I place an order for AT25SF081B-SHB-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25SF081B-SHB-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-SHB-B reliable?
The price and inventory of AT25SF081B-SHB-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-SHB-B is usually 5 days.
3.What payment methods are accepted for AT25SF081B-SHB-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25SF081B-SHB-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25SF081B-SHB-B?
AT25SF081B-SHB-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25SF081B-SHB-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-SHB-B?
For technical support, including AT25SF081B-SHB-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25SF081B-SHB-B requirements.
6.How does Aetrix verify that AT25SF081B-SHB-B is sourced from the original manufacturer or authorized distributors?
All AT25SF081B-SHB-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-SHB-B meets industry standards.
7.What is the process for return or replacement of AT25SF081B-SHB-B?
All AT25SF081B-SHB-B units undergo pre-shipment inspection (PSI). If there is an issue with AT25SF081B-SHB-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-SHB-B part is unused and in its original packaging.
Return procedure for AT25SF081B-SHB-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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