My Inquiry
My Account
Renesas AT25SF081-SHF-B
- Part No.:
- AT25SF081-SHF-B
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25SF081-SHF-B.pdf
- Description:
- IC FLASH 8MBIT SPI/QUAD 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,010
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT25SF081-SHF-B from Dialog Semiconductor (acquired Adesto) is an 8-Mbit SPI serial flash memory IC designed for code shadowing and data storage in embedded systems. It operates from 2.3V–3.6V, supports SPI Modes 0/3, delivers 104 MHz max clock frequency, achieves 6 ns clock-to-output delay, and features uniform 4/32/64-Kbyte block erase plus full chip erase.
For engineers reviewing the AT25SF081-SHF-B datasheet, AT25SF081-SHF-B pinout, AT25SF081-SHF-B application, or AT25SF081-SHF-B equivalent, key selection criteria include dual/quad I/O read throughput, hardware write protection via WP pin, security register programmability, industrial temperature support (−40°C to +85°C), and RoHS-compliant 8-lead SOIC (208-mil) packaging.
Technical Context
The AT25SF081-SHF-B implements a flexible erase architecture with four granular erase levels-256-byte page, 4-Kbyte, 32-Kbyte, and 64-Kbyte blocks-enabling efficient co-location of code modules and data segments without memory waste. Its memory array spans 0x000000–0xFFFFF (1 Mbyte address space), with address bits A23–A20 ignored.
It supports multiple high-speed read modes: standard Read Array (03h/0Bh), Dual-Output Read (3Bh), Dual-I/O Read (BBh), Quad-Output Read (6Bh), and Quad-I/O Read (EBh), all requiring QE bit enablement for quad modes. Command execution relies on SPI master control with CS assertion, opcode transmission, and optional address/dummy/data bytes per Table 5-1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 8 Mbit (1 Mbyte); sufficient for firmware images and configuration data in resource-constrained microcontrollers. |
| Supply Voltage | 2.3V–3.6V; compatible with modern low-voltage MCU I/O domains and eliminates need for level shifters. |
| Max Clock Frequency | 104 MHz; enables up to 104 MB/s effective throughput in Quad-I/O mode (4 bits/cycle × 104 MHz). |
| Read Latency | 6 ns tV (clock-to-output); ensures minimal wait states during instruction fetch or real-time data access. |
| Erase Granularity | Uniform 4/32/64-Kbyte blocks + full chip; allows precise over-the-air update partitioning and wear leveling. |
| Endurance & Retention | 100,000 program/erase cycles and 20-year data retention; validated for long-life industrial deployments. |
| Power Consumption | 2 µA deep power-down current; supports battery-backed or energy-harvesting applications with ultra-low quiescent draw. |
Pinout & Package
AT25SF081-SHF-B uses an 8-lead SOIC package (208-mil width, 0.15 mm lead thickness, JEDEC MS-012AC). Pin functions are electrically validated per DS-25SF081–045K–06/2023.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select input | Active-low enable; initiates all commands and places SO/SI in high-Z when deasserted. |
| SCK | Serial clock input | Drives timing for all SPI transfers; data latched on rising edge, output on falling edge. |
| SI (I/O0) | Serial input / Quad/Dual I/O | Receives opcodes, addresses, and data; becomes bidirectional I/O0 in Dual/Quad read modes. |
| SO (I/O1) | Serial output / Quad/Dual I/O | Outputs read data; becomes bidirectional I/O1 in Dual/Quad read modes; high-Z when CS inactive. |
| WP (I/O2) | Write protect input / Quad I/O | Hardware lock for protected sectors; becomes I/O2 in Quad modes; internally pulled-high. |
| HOLD (I/O3) | Communication hold input / Quad I/O | Pauses ongoing transfers without deselecting device; becomes I/O3 in Quad modes; internally pulled-high. |
| VCC | Power supply | 2.3V–3.6V main supply; powers core logic and I/O buffers. |
| GND | Ground reference | System ground return path; must be low-impedance for stable read/write margins. |
Key Features
| Feature | Design Value |
|---|---|
| Dual/Quad I/O Read Support | Enables 2× or 4× bandwidth vs standard SPI: 208 MB/s theoretical peak in Quad-I/O mode at 104 MHz. |
| Flexible Erase Architecture | Four erase granularities (256B page, 4/32/64KB blocks) reduce wasted space and improve firmware update efficiency. |
| Three Security Register Pages | Individually lockable 256-byte pages for ESN, cryptographic keys, or device serialization-no external secure element needed. |
| Hardware Write Protection | WP pin enables sector-level locking independent of software state-critical for bootloader integrity. |
| Low-Power Deep Power-Down | 2 µA typical current extends battery life in always-on sensor nodes or portable diagnostics equipment. |
Applications
| Industrial HMI Display Boot | Medical Sensor Firmware Storage |
|---|---|
|
Use Scenario: Embedded ARM Cortex-M7 HMI controller boots Linux kernel and GUI assets from external flash. IC Role / Device Role / Timing Role: Primary nonvolatile code storage with fast Quad-I/O read enabling sub-500 ms boot time. Use Value: 104 MHz Quad-I/O read and 6 ns tV minimize CPU wait states; 4-Kbyte erase aligns with Yocto OS partitioning. |
Use Scenario: Portable ECG monitor stores calibrated sensor algorithms and patient history logs. IC Role / Device Role / Timing Role: Dual-function code + data storage with hardware write protection for FDA-critical firmware. Use Value: WP pin prevents accidental overwrite during field updates; 20-year retention meets medical device lifecycle requirements. |
| Smart Meter Firmware Vault | Automotive Telematics OTA Module |
|
Use Scenario: ANSI C12.22-compliant smart meter retains encrypted firmware and tariff tables across 15+ year deployments. IC Role / Device Role / Timing Role: Secure, long-life flash with programmable security registers for utility-specific keys. Use Value: Three lockable security pages store AES-128 keys and digital certificates; 100K endurance supports frequent OTA patches. |
Use Scenario: Cellular-connected telematics unit downloads and validates firmware deltas over LTE. IC Role / Device Role / Timing Role: Dual-bank capable flash supporting A/B firmware partitioning and atomic updates. Use Value: Uniform 64-Kbyte erase blocks match CAN FD message payload sizes; Quad-I/O accelerates delta patch application. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT25SF081B-SHF-B | Direct revision with improved reliability and updated qualification; same pinout, timing, and command set. | Identical use cases; recommended for new designs per Dialog's "Not recommended for new designs" notice. | Select AT25SF081B-SHF-B for production ramp; AT25SF081-SHF-B remains viable for legacy BOM continuity. |
| Winbond W25Q80DVSSIG | 8-Mbit SPI flash with Quad I/O, 104 MHz max, but lacks security register pages and HOLD pin functionality. | Suitable for cost-sensitive consumer apps where ESN/key storage is handled externally. | Choose W25Q80DVSSIG only if security registers and HOLD-assisted pause are not required. |
Compared with AT25SF081-SHF-B, AT25SF081B-SHF-B offers assured long-term supply and enhanced process stability, while W25Q80DVSSIG trades security and communication control features for broader distributor availability and lower unit cost in non-critical applications.
Availability
AT25SF081-SHF-B is available at Aetrix Electronics and suitable for industrial HMI, medical sensor, smart meter, and automotive telematics applications requiring stable component supply and long-lifecycle support.
Supply support for AT25SF081-SHF-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
Dialog Semiconductor, now part of Renesas Electronics, specializes in highly integrated mixed-signal ICs for power management, audio, and memory solutions.
The AT25SF081-SHF-B belongs to Dialog's Adesto-acquired serial flash portfolio, engineered for robust code execution and secure data logging in industrial and medical edge devices.
FAQ
What is the operating voltage range of the AT25SF081-SHF-B?
The AT25SF081-SHF-B operates from 2.3V to 3.6V. This single-supply range ensures compatibility with 2.5V and 3.3V microcontroller I/O interfaces without level-shifting circuitry. Operation outside this range may cause unpredictable behavior or data corruption, and is not characterized per the datasheet DS-25SF081–045K–06/2023.
Does the AT25SF081-SHF-B support Quad-I/O read mode, and what is required to enable it?
Yes, the AT25SF081-SHF-B supports Quad-I/O Read (EBh command) at up to 104 MHz, but requires the Quad Enable (QE) bit in Status Register Byte 2 to be set first. The QE bit is programmed using the Write Status Register command (01h) after issuing Write Enable (06h). Once enabled, SI, SO, WP, and HOLD function as I/O0–I/O3 during Quad-I/O reads.
How many security register pages does the AT25SF081-SHF-B provide, and how are they protected?
The AT25SF081-SHF-B provides three programmable 256-byte security register pages. Each page can be individually locked using dedicated status bits, preventing further writes until unlocked via specific security commands. These pages support unique device serialization, ESN storage, and locked key management without requiring external secure elements.
What erase block sizes are available on the AT25SF081-SHF-B, and why does granularity matter?
The AT25SF081-SHF-B supports uniform 256-byte page, 4-Kbyte, 32-Kbyte, and 64-Kbyte block erases, plus full chip erase. Granular erase minimizes wasted space when updating small firmware modules or data records-unlike legacy flash with only 64-Kbyte blocks, where modifying a 1-Kbyte parameter would require erasing 63 Kbytes of unused data.
Is the AT25SF081-SHF-B pin-compatible with the AT25SF081B-SHF-B, and what is the key difference?
Yes, the AT25SF081-SHF-B is pin-, package-, and command-set compatible with the AT25SF081B-SHF-B. The primary difference is that AT25SF081B-SHF-B is the qualified successor with enhanced reliability testing and extended manufacturing support; Dialog explicitly marks AT25SF081-SHF-B as "Not recommended for new designs" in the datasheet.
AT25SF081-SHF-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 104 MHz
- Write Cycle Time - Word, Page:
- 5µs, 5ms
- Access Time:
- -
- Voltage - Supply:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25SF081-SHF-B FAQ
1.How can I place an order for AT25SF081-SHF-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25SF081-SHF-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 AT25SF081-SHF-B reliable?
The price and inventory of AT25SF081-SHF-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25SF081-SHF-B is usually 5 days.
3.What payment methods are accepted for AT25SF081-SHF-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25SF081-SHF-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25SF081-SHF-B?
AT25SF081-SHF-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25SF081-SHF-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 AT25SF081-SHF-B?
For technical support, including AT25SF081-SHF-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25SF081-SHF-B requirements.
6.How does Aetrix verify that AT25SF081-SHF-B is sourced from the original manufacturer or authorized distributors?
All AT25SF081-SHF-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 AT25SF081-SHF-B meets industry standards.
7.What is the process for return or replacement of AT25SF081-SHF-B?
All AT25SF081-SHF-B units undergo pre-shipment inspection (PSI). If there is an issue with AT25SF081-SHF-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 AT25SF081-SHF-B part is unused and in its original packaging.
Return procedure for AT25SF081-SHF-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT25SF081-SHF-B Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
