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Renesas AT26DF081A-SSU
- Part No.:
- AT26DF081A-SSU
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT26DF081A-SSU.pdf
- Description:
- IC FLASH 8MBIT SPI 70MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,610
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Product details
Overview
AT26DF081A-SSU 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 for mixed code+data applications.
For engineers reviewing the AT26DF081A-SSU datasheet, AT26DF081A-SSU pinout, AT26DF081A-SSU application, or AT26DF081A-SSU equivalent, this page provides verified technical context, real-world use cases, validated alternatives, and supply-chain support for industrial, consumer, and automotive-grade designs requiring high-speed, sector-protected nonvolatile storage.
Technical Context
The AT26DF081A-SSU implements a dual-input/dual-output SPI interface: SI/SO pins dynamically reconfigure as SIO/SOI during Dual-Input Program and Dual-Output Read operations, enabling 2-bit-per-clock throughput. Its internal architecture includes a 128-byte OTP security register, sector lockdown logic, and hardware write protection via the WP pin.
Erase granularity is optimized across four levels-4-Kbyte, 32-Kbyte, 64-Kbyte blocks, and full chip-with 16 physical 64-Kbyte sectors. Protection is enforced through individual sector lock/unlock commands, global protect/unprotect, and permanent sector lockdown, all managed via status register bits and dedicated opcodes (36h/39h/33h/34h).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 8 Mbit (1,048,576 bytes) - supports firmware images up to ~1 MB in size |
| Supply Voltage | 2.7V–3.6V - compatible with standard 3.3V I/O domains without level shifting |
| Max Clock Frequency | 100 MHz (RapidS™ mode) - enables 200 MB/s effective read bandwidth with dual-output |
| Read Latency | ≤5 ns tV (clock-to-output) - minimizes wait states in high-performance microcontroller boot sequences |
| Erase Granularity | 4-Kbyte / 32-Kbyte / 64-Kbyte blocks + full chip - allows fine-grained firmware patching and data logging |
| Endurance & Retention | 100,000 program/erase cycles; 20-year data retention - suitable for field-upgradable industrial controllers |
| Power Consumption | 5 µA deep power-down current - enables ultra-low-power sleep modes in battery-backed systems |
Pinout & Package
AT26DF081A-SSU is packaged in an 8-lead SOIC (208-mil wide), pin-compatible with JEDEC MS-012AC. All signals conform to standard SPI quad-wire interface plus HOLD and WP for hardware control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; initiates command sequence on high-to-low transition and terminates on low-to-high |
| SCK | Serial Clock | Master-generated clock; data latched on rising edge (SI/SIO), output on falling edge (SO/SOI) |
| SI (SIO) | Serial Input / Dual-Output | Standard input for commands/addresses/data; becomes output during Dual-Output Read (3Bh) |
| SO (SOI) | Serial Output / Dual-Input | Standard output for read data; becomes input during Dual-Input Program (A2h) |
| WP | Write Protect | Hardware lock for protected sectors; low-active; internally pulled high |
| HOLD | Communication Pause | Halts ongoing SPI transfer without deselecting device; low-active; internally pulled high |
| VCC | Power Supply | 2.7V–3.6V main supply; powers core logic, memory array, and I/O buffers |
| GND | Ground Reference | System ground return path for all internal circuits and I/O drivers |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Output Read (3Bh) | Delivers 2 bits per SCK cycle - doubles effective read throughput vs. standard SPI at same frequency |
| Flexible Erase Architecture | Four erase granularities (4/32/64-Kbyte + full chip) - eliminates need for external EEPROM in mixed-code-and-data systems |
| Permanent Sector Lockdown | Any combination of 64-Kbyte sectors can be made irreversibly read-only - secures bootloader or cryptographic keys |
| 128-Byte OTP Security Register | Stores unique device identifiers, ESNs, or locked encryption keys - immune to field reprogramming |
| Individual + Global Sector Protection | Per-sector lock/unlock (36h/39h) plus global protect/unprotect (01h byte 1) - simplifies manufacturing and field updates |
Applications
| Industrial PLC Firmware Storage | Automotive Infotainment Boot Memory |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers with over-the-air capability. IC Role / Device Role / Timing Role: Nonvolatile code storage with rapid sector-erase for safe firmware patching without full reflash. Use Value: 4-Kbyte block erase enables subroutine-level updates; sector lockdown prevents corruption of safety-critical boot code. |
Use Scenario: Holding boot firmware and UI assets in head-unit systems requiring fast startup and secure update paths. IC Role / Device Role / Timing Role: Primary boot memory interfaced to ARM Cortex-A application processor via SPI. Use Value: 100MHz RapidS™ read speed reduces boot time; OTP register stores vehicle-specific calibration data. |
| Smart Home Gateway Configuration | Medical Diagnostic Device Data Logging |
Use Scenario: Persisting network credentials, user preferences, and OTA update metadata across power cycles. IC Role / Device Role / Timing Role: Dual-purpose code+data storage with hardware write protection for configuration integrity. Use Value: WP pin hardens against accidental overwrite; 5 µA deep power-down extends battery life in mains-off standby. |
Use Scenario: Recording sensor calibration parameters and diagnostic logs in portable ultrasound or ECG units. IC Role / Device Role / Timing Role: High-reliability data archive with 100K-cycle endurance and 20-year retention. Use Value: 32-Kbyte block erase aligns with log buffer sizes; sector lockdown protects factory calibration constants. |
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, 3.3V, 104MHz max clock; no RapidS™; no dual-input programming; 256-byte page only | Lacks dual-mode I/O and sector lockdown; uses standard SPI read/write only | Choose when RapidS™ or hardware security features are unnecessary and cost is primary driver |
| Micron MT25QL80ABB8E12-0SIT | 8-Mbit, 3.3V, 133MHz octal DTR capable; requires different command set and layout; no OTP register | Higher bandwidth but needs octal-capable controller; no built-in sector lockdown or 128-byte OTP | Choose for systems already using Micron's QSPI ecosystem and requiring >100MHz sustained throughput |
Compared with W25Q80DVSSIG and MT25QL80ABB8E12-0SIT, the AT26DF081A-SSU uniquely combines RapidS™ acceleration, dual-input/dual-output flexibility, permanent sector lockdown, and a dedicated 128-byte OTP register - making it optimal for secure, field-upgradable embedded systems where code integrity and mixed-use efficiency are critical.
Availability
AT26DF081A-SSU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive infotainment boot memory, and smart home gateway configuration requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AT26DF081A-SSU 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, part of Renesas Electronics) specialized in low-power, high-performance nonvolatile memory and IoT connectivity solutions.
The AT26DF081A-SSU belongs to Adesto's DataFlash® family, engineered for embedded systems needing fast, flexible, and secure serial Flash with advanced protection and low-power operation.
FAQ
What is the maximum operating frequency of the AT26DF081A-SSU in RapidS™ mode?
The AT26DF081A-SSU supports up to 100 MHz in RapidS™ mode, enabling high-speed sequential reads with dual-output capability. This frequency applies specifically to the 1Bh and 3Bh opcodes (Read Array and Dual-Output Read Array). Standard SPI Mode 0/3 operation supports up to 85 MHz using the 0Bh opcode, while legacy 03h reads are rated to 50 MHz. The 100 MHz rating assumes proper signal integrity and VCC ≥2.7V.
Does the AT26DF081A-SSU support true dual-input programming?
Yes, the AT26DF081A-SSU supports Dual-Input Byte/Page Program using opcode A2h, where both SI and SO pins act as inputs simultaneously - clocking two bits per SCK cycle. This feature reduces programming time by up to 50% compared to standard single-input mode (02h) for the same data volume, provided the host controller supports bidirectional SO pin control during write cycles.
How many physical sectors does the AT26DF081A-SSU have, and what is their size?
The AT26DF081A-SSU contains 16 uniform physical sectors, each 64 Kbytes in size, totaling 1,048,576 bytes (8 Mbit). Each sector can be individually protected, unprotected, or permanently locked down. The memory map also supports smaller erase blocks (4-Kbyte and 32-Kbyte) that subdivide these sectors for finer-grained updates without affecting adjacent protected regions.
Can the AT26DF081A-SSU's OTP security register be reprogrammed after initial write?
No, the 128-byte OTP (One-Time Programmable) Security Register in the AT26DF081A-SSU is permanently programmable only once. After programming via opcode 9Bh, further writes to that register are blocked. This ensures immutability of stored data such as device serial numbers, cryptographic keys, or calibration constants - a key requirement for secure boot and anti-counterfeiting implementations using the AT26DF081A-SSU.
What package options are available for the AT26DF081A-SSU, and what does 'SSU' denote?
The 'SSU' suffix in AT26DF081A-SSU specifies the 8-lead SOIC package with 208-mil body width (standard JEDEC MS-012AC footprint). Adesto also offered an 8-pad Ultra Thin DFN (5 × 6 × 0.6 mm) variant ('UD' suffix), but AT26DF081A-SSU is exclusively the SOIC version. Both packages are Pb/Halide-free and RoHS compliant, with identical pinout and electrical behavior.
AT26DF081A-SSU 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-SSU FAQ
1.How can I place an order for AT26DF081A-SSU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT26DF081A-SSU 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-SSU reliable?
The price and inventory of AT26DF081A-SSU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT26DF081A-SSU is usually 5 days.
3.What payment methods are accepted for AT26DF081A-SSU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT26DF081A-SSU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT26DF081A-SSU?
AT26DF081A-SSU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT26DF081A-SSU 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-SSU?
For technical support, including AT26DF081A-SSU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT26DF081A-SSU requirements.
6.How does Aetrix verify that AT26DF081A-SSU is sourced from the original manufacturer or authorized distributors?
All AT26DF081A-SSU 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-SSU meets industry standards.
7.What is the process for return or replacement of AT26DF081A-SSU?
All AT26DF081A-SSU units undergo pre-shipment inspection (PSI). If there is an issue with AT26DF081A-SSU, 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-SSU part is unused and in its original packaging.
Return procedure for AT26DF081A-SSU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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