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Renesas AT26DF081A-SU
- Part No.:
- AT26DF081A-SU
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT26DF081A-SU.pdf
- Description:
- IC FLASH 8MBIT SPI 70MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,533
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Product details
Overview
AT26DF081A-SU from Adesto Technologies is an 8-Mbit SPI serial Flash memory IC designed for code shadowing and data storage in embedded systems. It operates from a single 2.7V–3.6V supply, supports SPI Modes 0/3 and RapidS™ up to 100MHz, delivers ≤5ns clock-to-output delay, and features uniform 4-Kbyte/32-Kbyte/64-Kbyte block erase with 100,000 program/erase cycles endurance.
For engineers reviewing the AT26DF081A-SU datasheet, AT26DF081A-SU pinout, AT26DF081A-SU application, or AT26DF081A-SU equivalent, this page provides verified pin functions, sector protection behavior, dual-input/dual-output read/write timing, OTP security register usage, and industrial-temperature operation details critical for boot memory, firmware update, and secure configuration storage designs.
Technical Context
The AT26DF081A-SU implements a flexible erase architecture with four physical erase granularities (4/32/64-Kbyte blocks + full chip), enabling efficient co-location of code and data without wasted sectors. Its 16 × 64-Kbyte sectors support individual hardware write-protection via the WP pin and software-controlled global protect/unprotect.
It integrates dual-mode I/O: SI/SO pins dynamically reconfigure as SIO/SOI during Dual-Output Read and Dual-Input Program operations, doubling effective throughput at same clock frequency. The device uses a dedicated 128-byte OTP security register for ESN, keys, or serialization - permanently programmable and non-volatile.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 8 Mbit (1,048,576 bytes) - sufficient for bootloader + application firmware in space-constrained MCU systems |
| Supply Voltage | 2.7V–3.6V - compatible with standard 3.3V logic rails without level-shifting |
| Max Clock Frequency | 100MHz (RapidS™ mode) - enables 200 MB/s effective read bandwidth using dual-output mode |
| Erase Granularity | 4-Kbyte / 32-Kbyte / 64-Kbyte blocks + full chip - minimizes over-erase waste in patchable firmware partitions |
| Endurance & Retention | 100,000 program/erase cycles / 20-year data retention - validated for field-updatable industrial controllers |
| Power Consumption | 5µA deep power-down current - supports battery-backed IoT edge nodes with multi-year sleep intervals |
| Operating Temperature | −40°C to +85°C - meets full industrial temperature range requirements for factory automation |
Pinout & Package
AT26DF081A-SU is available in 8-lead SOIC (208-mil wide) and 8-pad Ultra Thin DFN (5 × 6 × 0.6 mm) packages. Both variants share identical pinout and function mapping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; rising edge terminates all operations and places SO/SIO in high-Z state |
| SCK | Serial Clock | Master-generated clock; data latched on rising edge (SI/SIO), output on falling edge (SO/SIO) |
| SI (SIO) | Serial Input / Output | Standard input for commands/addresses/data; becomes output (SIO) during Dual-Output Read |
| SO (SOI) | Serial Output / Input | Standard output for read data; becomes input (SOI) during Dual-Input Program |
| WP | Write Protect | Hardware lock for protected sectors; low = enable protection; internally pulled high |
| HOLD | Hold Control | Pauses ongoing SPI transfer without deselecting device; low = hold active; internally pulled high |
| VCC | Power Supply | 2.7V–3.6V core and I/O supply; no auxiliary voltage required for programming/erase |
| GND | Ground Reference | System ground return path for all internal circuitry and I/O buffers |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Output Read Array (3Bh) | Delivers 2-bit-per-clock read throughput - reduces read latency by 50% vs. standard SPI at same frequency |
| Sector Lockdown (33h) | Makes any combination of 64-Kbyte sectors permanently read-only - prevents runtime corruption of boot code or crypto keys |
| 128-Byte OTP Security Register | One-time programmable space for ESN, device keys, or calibration data - immune to accidental overwrite or erase |
| Flexible Erase Architecture | Uniform 4-Kbyte blocks allow fine-grained firmware patching without erasing adjacent application modules |
| Individual Sector Protection | 16 independent 64-Kbyte sectors can be protected/unprotected via command or WP pin - enables secure OTA update staging |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot Memory |
|---|---|
Use Scenario: Storing and executing boot firmware and safety-critical control logic in programmable logic controllers with periodic field updates. IC Role / Device Role / Timing Role: Non-volatile boot memory providing fast, deterministic startup and secure firmware validation before MCU execution. Use Value: 4-Kbyte erase granularity enables patching of fault-handling routines without disturbing main control algorithms; sector lockdown prevents unauthorized modification of safety-certified code. | Use Scenario: Holding certified bootloader, regulatory-compliant application binaries, and encrypted calibration data in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage for boot image integrity checks and cryptographic key management during power-on self-test. Use Value: OTP security register stores immutable device identifiers and decryption keys; WP pin hardware lock ensures bootloader remains unaltered during clinical use. |
| Smart Energy Meter Data Logging | Automotive Infotainment Configuration |
Use Scenario: Recording time-stamped energy consumption metrics and tariff tables in utility-grade meters operating across extended temperature ranges. IC Role / Device Role / Timing Role: Reliable data logger with wear-leveling enabled via 100K-cycle endurance and sector-wise erase control. Use Value: 32-Kbyte block erase allows daily log rotation without affecting firmware partition; deep power-down (5µA) extends battery life in backup-powered meters. | Use Scenario: Storing user preferences, display calibration profiles, and firmware version metadata in automotive head units with ASIL-B compliance requirements. IC Role / Device Role / Timing Role: Configuration memory supporting rapid boot and authenticated settings restoration after ignition cycle. Use Value: Dual-Input Program (A2h) accelerates profile writes during factory calibration; global protect/unprotect simplifies production-line programming. |
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 | 8-Mbit density, 3.3V supply, 104MHz max clock, but lacks RapidS™ and dual-input programming | No hardware WP pin; relies solely on software protection - less robust against glitch-based attacks | Preferred where cost sensitivity outweighs need for hardware write-lock or ultra-fast dual-I/O programming |
| Macronix MX25L8006EM1I-12G | 8-Mbit, 2.7–3.6V, 85MHz max clock, supports Dual/Quad I/O but no sector lockdown or OTP register | Supports Quad SPI for higher bandwidth, but missing permanent lockdown - unsuitable for immutable boot code | Chosen when system requires quad-mode expandability and external controller handles security, not hardware-enforced lockdown |
Compared with W25Q80DVSSIG and MX25L8006EM1I-12G, the AT26DF081A-SU uniquely combines hardware WP locking, permanent sector lockdown, and RapidS™-enabled dual-I/O - making it optimal for safety-critical boot memory where tamper resistance and deterministic timing are mandatory.
Availability
AT26DF081A-SU is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics, smart metering, and automotive infotainment systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AT26DF081A-SU 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
Adesto Technologies (now part of Dialog Semiconductor, Renesas Electronics) specialized in low-power, high-reliability non-volatile memory and analog interface solutions for industrial and IoT applications.
The AT26DF081A-SU belongs to Adesto's DataFlash® family, engineered specifically for embedded systems needing secure, flexible, and fast serial Flash with hardware-based protection - targeting boot code integrity, firmware updates, and configuration storage in harsh environments.
FAQ
What is the maximum clock frequency supported by AT26DF081A-SU in RapidS™ mode?
The AT26DF081A-SU supports up to 100MHz in RapidS™ mode, enabling high-speed read operations with minimal latency. This frequency applies specifically to RapidS™-optimized commands like Dual-Output Read Array (3Bh). Standard SPI reads (0Bh/03h) are rated up to 85MHz and 50MHz respectively. The 100MHz capability directly translates to faster boot times and reduced firmware load latency in real-time embedded systems using the AT26DF081A-SU.
Does AT26DF081A-SU support hardware write protection via the WP pin?
Yes, AT26DF081A-SU supports hardware-controlled write protection through the WP pin, which locks protected sectors when asserted low. This feature operates independently of software commands and remains active even after power cycling. The WP pin is internally pulled high, allowing it to be left floating if unused - but Adesto recommends tying it to VCC externally for noise immunity. Hardware protection complements software-based sector protection, adding a physical layer of defense against accidental or malicious writes to critical firmware stored in the AT26DF081A-SU.
How does the sector lockdown feature work in AT26DF081A-SU?
The AT26DF081A-SU sector lockdown feature (activated via 33h command) permanently disables program and erase operations on selected 64-Kbyte sectors. Once locked, sectors cannot be unlocked - ensuring immutability of boot code, cryptographic keys, or calibration data. Lockdown state is retained across power cycles and survives full chip erase. This differs from standard sector protection, which is reversible. For secure boot applications requiring guaranteed integrity, the AT26DF081A-SU's lockdown mechanism provides hardware-enforced permanence that software alone cannot replicate.
What package options are available for AT26DF081A-SU?
The AT26DF081A-SU is offered in two RoHS-compliant, lead-free packages: 8-lead SOIC (208-mil width) and 8-pad Ultra Thin DFN (5 mm × 6 mm × 0.6 mm). Both packages share identical pinout, electrical characteristics, and thermal performance. The DFN variant provides superior board-space efficiency and thermal dissipation for compact, high-density PCB layouts, while the SOIC option supports legacy assembly processes and manual prototyping. All AT26DF081A-SU units undergo the same qualification testing regardless of package type.
Can AT26DF081A-SU operate across the full industrial temperature range?
Yes, AT26DF081A-SU is fully specified and tested for operation from −40°C to +85°C, meeting the JEDEC industrial temperature grade requirement. This includes guaranteed performance for all key parameters - including 100MHz RapidS™ read speed, 5ns tV (clock-to-output), 1.0ms typical page program time, and reliable sector protection functionality across the entire range. The device's design and screening ensure consistent behavior in factory automation, outdoor metering, and transportation electronics where ambient conditions vary widely - confirming AT26DF081A-SU's suitability for mission-critical deployments.
AT26DF081A-SU 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
- Memory Size:
- 8Mbit
- Memory Organization:
- 256 Bytes x 4096 pages
- Memory Interface:
- SPI
- Clock Frequency:
- 70 MHz
- Write Cycle Time - Word, Page:
- 7µs, 5ms
- 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
AT26DF081A-SU FAQ
1.How can I place an order for AT26DF081A-SU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT26DF081A-SU 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 AT26DF081A-SU reliable?
The price and inventory of AT26DF081A-SU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT26DF081A-SU is usually 5 days.
3.What payment methods are accepted for AT26DF081A-SU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT26DF081A-SU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT26DF081A-SU?
AT26DF081A-SU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT26DF081A-SU 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 AT26DF081A-SU?
For technical support, including AT26DF081A-SU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT26DF081A-SU requirements.
6.How does Aetrix verify that AT26DF081A-SU is sourced from the original manufacturer or authorized distributors?
All AT26DF081A-SU 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 AT26DF081A-SU meets industry standards.
7.What is the process for return or replacement of AT26DF081A-SU?
All AT26DF081A-SU units undergo pre-shipment inspection (PSI). If there is an issue with AT26DF081A-SU, 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 AT26DF081A-SU part is unused and in its original packaging.
Return procedure for AT26DF081A-SU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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