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Renesas AT25SF081-MAHD-T
- Part No.:
- AT25SF081-MAHD-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
AT25SF081-MAHD-T.pdf
- Description:
- IC FLASH 8MBIT SPI/QUAD 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,912
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Product details
Overview
AT25SF081-MAHD-T from Dialog Semiconductor (formerly Adesto) is an 8-Mbit serial flash memory IC designed for code shadowing and data storage in embedded systems. It operates from a single 2.3V–3.6V supply, supports SPI Modes 0/3, delivers up to 104 MHz 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-MAHD-T datasheet, AT25SF081-MAHD-T pinout, AT25SF081-MAHD-T application, or AT25SF081-MAHD-T equivalent, this page provides verified technical context, validated pin functions, real-world use cases, and confirmed alternative parts for industrial-grade serial flash selection.
Technical Context
The AT25SF081-MAHD-T implements a flexible multi-granularity erase architecture with uniform 4-Kbyte, 32-Kbyte, 64-Kbyte, and full-chip erase blocks-optimized to minimize wasted space in mixed code-and-data applications. Its SPI interface supports standard, dual-output, dual-I/O, quad-output, and quad-I/O read modes, all requiring explicit command opcodes and address latching.
Hardware write protection is enabled via the WP pin, while HOLD enables communication pause without deselection. The device includes three programmable security register pages for ESN, serialization, or key storage, each individually lockable. Quad-mode operation requires explicit QE bit setting in the status register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 8 Mbit (1,048,576 bytes), sufficient for firmware images and configuration data in resource-constrained devices |
| Supply Voltage | 2.3 V – 3.6 V - compatible with modern low-voltage microcontrollers and SoCs without level-shifting |
| Max Clock Frequency | 104 MHz - enables high-throughput reads (e.g., 52 MB/s in Quad-I/O mode) |
| Read Latency | 6 ns tV - ensures minimal wait states during code execution from flash |
| Erase Granularity | Uniform 4-Kbyte / 32-Kbyte / 64-Kbyte blocks + full chip - supports fine-grained firmware updates and data logging |
| Endurance & Retention | 100,000 program/erase cycles and 20-year data retention - suitable for field-deployed industrial firmware |
| Power Consumption | 2 µA deep power-down current - enables ultra-low-power sleep modes in battery-operated edge nodes |
Pinout & Package
AT25SF081-MAHD-T uses an 8-lead SOIC (150-mil) package with standard SPI-compatible pinout and dual/quad I/O reconfiguration capability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must transition low-to-high to complete any operation, including self-timed erase/program |
| SCK | Serial Clock | Input clock controlling data sampling (rising edge) and output timing (falling edge); polarity/phase defines SPI Mode 0 or 3 |
| SI (I/O0) | Serial Input / Quad I/O Lane 0 | Primary command/address/data input; becomes bidirectional I/O0 in Dual/Quad modes for parallel data transfer |
| SO (I/O1) | Serial Output / Quad I/O Lane 1 | Primary data output; becomes bidirectional I/O1 in Dual/Quad modes - MSB always appears on SO/I/O1 first |
| WP (I/O2) | Write Protect / Quad I/O Lane 2 | Hardware lock control for protected sectors; repurposed as I/O2 in Quad modes - internally pulled high |
| HOLD (I/O3) | Communication Hold / Quad I/O Lane 3 | Pauses ongoing SPI transfers without deselecting; becomes I/O3 in Quad modes - internally pulled high |
| VCC | Power Supply | Single 2.3–3.6 V supply rail; powers internal logic, charge pumps, and I/O buffers |
| GND | Ground Reference | System ground return path for all internal circuitry and I/O signaling |
Key Features
| Feature | Design Value |
|---|---|
| Dual/Quad Read Support | Enables 2× or 4× read bandwidth vs standard SPI - reduces boot time and firmware load latency |
| Flexible Erase Architecture | Four uniform block sizes eliminate over-erasure waste - improves usable density for mixed code/data layouts |
| Security Register Pages | Three dedicated, individually lockable pages for secure device ID, ESN, or cryptographic keys - no external EEPROM needed |
| Hardware Write Protection | WP pin enables sector-level hardware locking independent of software state - prevents accidental firmware corruption |
| Low-Power Deep Power-Down | 2 µA typical current draw extends battery life in always-on sensor nodes and IoT endpoints |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot Code |
|---|---|
Use Scenario: Storing and executing firmware for programmable logic controllers operating in extended temperature ranges (-40°C to +85°C). IC Role / Device Role / Timing Role: Non-volatile code storage with fast random-access read capability and deterministic 6 ns tV for tight real-time interrupt response. Use Value: Uniform 4-Kbyte erase blocks allow incremental firmware patching without disrupting operational logic modules. |
Use Scenario: Holding certified boot loader and application binaries in Class II medical instruments requiring long-term data integrity. IC Role / Device Role / Timing Role: Secure, high-reliability flash memory supporting 20-year data retention and hardware write protection against runtime corruption. Use Value: Three programmable security register pages store device-specific cryptographic keys and regulatory compliance identifiers. |
| Smart Meter Configuration Data | Automotive Infotainment UI Assets |
Use Scenario: Logging tariff schedules, calibration parameters, and tamper-event logs in utility smart meters with limited write cycles. IC Role / Device Role / Timing Role: Data storage element with 100,000 program/erase endurance and low active current (4 mA typical) during metering intervals. Use Value: 32-Kbyte and 64-Kbyte erase blocks align with firmware update partitioning schemes used in ANSI C12.22-compliant meters. |
Use Scenario: Caching graphical assets and voice prompt audio in automotive head units where rapid UI rendering is required. IC Role / Device Role / Timing Role: High-speed serial flash delivering up to 104 MHz Quad-I/O reads to feed GPU texture pipelines without DRAM buffering. Use Value: 104 MHz maximum clock and 6 ns tV reduce asset load latency, improving perceived responsiveness of infotainment interfaces. |
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-MAHD-T | Direct successor with enhanced reliability, same pinout and command set; supports identical voltage, timing, and erase architecture | Recommended for new designs per Dialog's "Not recommended for new designs" notice on AT25SF081 | Select AT25SF081B-MAHD-T when long-term supply assurance and latest process node benefits are required |
| Winbond W25Q80DVSSIG | 8-Mbit SPI flash with Quad-I/O, 104 MHz max, but lacks security register pages and uses different status register layout | Used in cost-sensitive consumer electronics where security registers are unnecessary | Choose W25Q80DVSSIG only if security page functionality is not required and legacy driver compatibility is verified |
Compared with AT25SF081-MAHD-T, the AT25SF081B-MAHD-T offers identical functionality with improved manufacturing consistency, while the W25Q80DVSSIG trades security features for broader third-party ecosystem support - making the B-version optimal for continuity and the Winbond part viable only in non-security-critical contexts.
Availability
AT25SF081-MAHD-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device boot code, smart meter configuration data, and automotive infotainment UI assets requiring stable component supply across extended product lifecycles.
Supply support for AT25SF081-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
Dialog Semiconductor (now part of Renesas) is a fabless semiconductor company specializing in low-power, mixed-signal ICs for mobile, IoT, and industrial applications.
The AT25SF081-MAHD-T belongs to Dialog's serial flash memory product line, engineered for robust code execution and secure data storage in harsh environments with extended temperature operation and high endurance.
FAQ
What is the operating voltage range for the AT25SF081-MAHD-T?
The AT25SF081-MAHD-T operates from a single supply of 2.3 V to 3.6 V. This range ensures compatibility with modern low-voltage microcontrollers and eliminates the need for external level shifters in most embedded designs. Operation outside this range may cause unreliable behavior or data corruption, and is not supported per the official datasheet DS-25SF081–045K.
Does the AT25SF081-MAHD-T support Quad-I/O read commands?
Yes, the AT25SF081-MAHD-T supports Quad-I/O Read (opcode EBh) at up to 104 MHz, provided the Quad Enable (QE) bit in the status register is set. All four I/O pins (SI/I/O0, SO/I/O1, WP/I/O2, HOLD/I/O3) function as bidirectional data lanes during Quad-I/O mode, enabling 4-bit-per-cycle throughput for accelerated firmware loading.
How many erase block sizes does the AT25SF081-MAHD-T support?
The AT25SF081-MAHD-T supports four uniform erase granularities: 4-Kbyte, 32-Kbyte, 64-Kbyte, and full-chip erase. This architecture allows precise allocation of code and data segments into dedicated erase regions, minimizing wasted space compared to fixed-large-block alternatives - a key advantage for firmware update efficiency.
Is the AT25SF081-MAHD-T pin-compatible with the AT25SF081B-MAHD-T?
Yes, the AT25SF081-MAHD-T is pin-compatible and command-compatible with the AT25SF081B-MAHD-T. The B-version is a direct replacement introduced by Dialog to supersede the original AT25SF081, offering enhanced process reliability while maintaining identical SOIC-8 packaging, pinout, electrical characteristics, and instruction set.
What is the purpose of the three security register pages in the AT25SF081-MAHD-T?
The AT25SF081-MAHD-T includes three dedicated, individually lockable security register pages used for storing unique device identifiers, electronic serial numbers (ESN), or cryptographic keys. These pages are accessed via specific opcodes (42h/44h/48h) and can be permanently locked to prevent overwrite - eliminating the need for external secure elements in many embedded applications.
AT25SF081-MAHD-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-UFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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:
- 2.5V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-UDFN (2x3)
AT25SF081-MAHD-T FAQ
1.How can I place an order for AT25SF081-MAHD-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25SF081-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 AT25SF081-MAHD-T reliable?
The price and inventory of AT25SF081-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 AT25SF081-MAHD-T is usually 5 days.
3.What payment methods are accepted for AT25SF081-MAHD-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25SF081-MAHD-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25SF081-MAHD-T?
AT25SF081-MAHD-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25SF081-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 AT25SF081-MAHD-T?
For technical support, including AT25SF081-MAHD-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25SF081-MAHD-T requirements.
6.How does Aetrix verify that AT25SF081-MAHD-T is sourced from the original manufacturer or authorized distributors?
All AT25SF081-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 AT25SF081-MAHD-T meets industry standards.
7.What is the process for return or replacement of AT25SF081-MAHD-T?
All AT25SF081-MAHD-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25SF081-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 AT25SF081-MAHD-T part is unused and in its original packaging.
Return procedure for AT25SF081-MAHD-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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