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Renesas AT26DF161A-SSU
- Part No.:
- AT26DF161A-SSU
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT26DF161A-SSU.pdf
- Description:
- IC FLASH 16MBIT SPI 70MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,583
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Product details
Overview
AT26DF161A-SSU from Adesto Technologies (now part of Dialog Semiconductor) is a 16-Mbit 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 up to 70 MHz, features uniform 4/32/64-Kbyte erase blocks, and delivers 100,000 program/erase cycles with 20-year data retention - deployed in industrial controllers and firmware-updatable IoT edge nodes.
For engineers reviewing the AT26DF161A-SSU datasheet, AT26DF161A-SSU pinout, AT26DF161A-SSU application, or AT26DF161A-SSU equivalent, key selection criteria include its flexible sector protection architecture, deep power-down current (10 µA), JEDEC-compliant ID read, and dual-package availability (8-lead SOIC and 8-pad MLF) for space-constrained PCB layouts.
Technical Context
The AT26DF161A-SSU implements a SPI-compatible serial interface with hardware-controlled write protection via dedicated WP and HOLD pins, enabling secure, low-overhead firmware updates without external logic. Its internal address counter supports sequential byte programming and wrap-around reads, eliminating host-side address management overhead.
Memory organization comprises thirty-two 64-Kbyte physical sectors, each individually lockable, plus hierarchical erase granularity (4/32/64-Kbyte blocks and full-chip erase). Protection is enforced by status register bits and hardware pin assertion, ensuring robust immunity against accidental writes during power transients or software faults.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 16 Mbit (2 MByte) - sufficient for boot code + configuration + firmware patch storage in resource-limited microcontrollers. |
| Supply Voltage | 2.7V–3.6V - compatible with standard 3.3V I/O domains; no auxiliary voltage required for programming/erase. |
| Max Clock Frequency | 70 MHz - enables high-throughput firmware loading and real-time parameter logging at >8 MB/s effective read rate. |
| Erase Granularity | 4-Kbyte blocks - allows fine-grained update of individual bootloader sections without disturbing adjacent application code. |
| Endurance | 100,000 program/erase cycles - supports field firmware upgrades over 10+ years in industrial gateways. |
| Data Retention | 20 years at 85°C - validated for long-life deployment in automotive telematics and energy metering applications. |
| Deep Power-down Current | 10 µA typical - extends battery life in always-on sensor nodes during idle periods without sacrificing wake-up latency. |
Pinout & Package
AT26DF161A-SSU is available in an 8-lead SOIC package (208-mil width), pin-compatible with industry-standard serial Flash footprints. Pin functions are electrically isolated and fully defined per JEDEC MS-012.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; rising edge terminates all operations and places SO in high-impedance state - critical for multi-device SPI bus arbitration. |
| SCK | Serial Clock | Master-generated clock; data latched on rising edge (SI), output on falling edge (SO) - defines timing margin for 70 MHz operation. |
| SI | Serial Input | Command, address, and data input path; MSB-first protocol ensures deterministic opcode decoding across temperature range. |
| SO | Serial Output | Read data and status register output; high-impedance when CS deasserted - prevents bus contention in shared SPI configurations. |
| WP | Write Protect | Hardware lock for protected sectors; internally pulled-high - eliminates need for external pull-up in most designs. |
| HOLD | Hold | Pauses ongoing transfers without deselecting device; requires CS asserted and SCK low - preserves transaction state during interrupt servicing. |
| VCC | Power Supply | Single 2.7–3.6V rail powers core logic and charge pump - simplifies power tree in 3.3V systems. |
| GND | Ground | Reference for all I/O and internal circuitry; must be connected to system ground plane for EMI control and stable erase verification. |
Key Features
| Feature | Design Value |
|---|---|
| Uniform Erase Architecture | Four granularities (4/32/64-Kbyte blocks + full chip) - minimizes wasted space when updating partial firmware images or logging cyclic data buffers. |
| Individual Sector Protection | 32 × 64-Kbyte sectors with hardware lock/unlock - enables secure separation of bootloader, application, and user-configurable data regions. |
| Automatic Program/Erase Verification | On-chip error detection reports failures via EPE bit in status register - eliminates need for external CRC checking or host-side retransmission logic. |
| Deep Power-down Mode | 10 µA typical current draw with instant wake-up - reduces average power in duty-cycled wireless sensors without sacrificing responsiveness. |
| JEDEC Standard ID Read | 9Fh command returns manufacturer (0x1F) and device (0x46) IDs - enables runtime flash identification and BOM validation in automated test systems. |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Storing and updating ladder logic programs and I/O mapping tables in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Non-volatile code and parameter storage with hardware write protection to prevent corruption during brown-out events or ESD transients. Use Value: 4-Kbyte erase blocks allow incremental updates of control algorithms without erasing calibration data stored in adjacent sectors. |
Use Scenario: Holding device-specific calibration coefficients, patient history logs, and regulatory-compliant audit trails in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, long-retention data logger with global protect capability to safeguard FDA-mandated records from accidental overwrite. Use Value: 20-year data retention at 85°C ensures integrity of lifetime calibration data across product service life without periodic refresh. |
| Automotive Infotainment Bootloader | Smart Energy Meter Firmware |
Use Scenario: Hosting primary bootloader and secure firmware update partition in head-unit ECUs requiring AEC-Q100 compliance and OTA resilience. IC Role / Device Role / Timing Role: Trusted code execution anchor with sector-level protection to isolate verified boot chain from untrusted application layers. Use Value: Hardware WP/HOLD pins provide fail-safe write inhibition during power cycling - critical for ASIL-B functional safety requirements. |
Use Scenario: Storing tariff tables, communication stack binaries, and tamper-evident usage logs in utility-grade electricity meters deployed outdoors. IC Role / Device Role / Timing Role: Industrial-temperature-rated non-volatile memory supporting remote firmware patches and regulatory firmware versioning. Use Value: 100,000 endurance cycles support 5+ daily firmware updates over 50 years - exceeding ANSI C12.22 lifecycle mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT25DF161-SSHN-T | Successor device with identical density, voltage, and pinout; adds Quad SPI support and faster 85 MHz clock rating. | Required for new designs targeting higher throughput or future-proofing against bandwidth constraints in next-gen MCU platforms. | Select AT25DF161-SSHN-T for new designs where Quad SPI compatibility or extended speed margin is needed; AT26DF161A-SSU remains valid for legacy-replacement scenarios. |
| MX25L1606EM2I-12G | 16-Mbit SPI Flash with same 2.7–3.6V range and SOIC-8 package; differs in command set (e.g., 0x06/0x04 vs. 0x06/0x04), sector protection granularity (64-Kbyte only), and 50,000-cycle endurance. | Suitable for cost-sensitive consumer applications where reduced endurance and simplified protection model are acceptable. | Choose MX25L1606EM2I-12G when budget constraints outweigh need for 100K-cycle endurance or 4-Kbyte erase flexibility. |
Compared with AT25DF161-SSHN-T, the AT26DF161A-SSU lacks Quad SPI but offers proven field reliability in existing industrial deployments; versus MX25L1606EM2I-12G, it provides double the endurance and finer erase control - critical for firmware update-intensive applications.
Availability
AT26DF161A-SSU is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and automotive infotainment systems requiring stable component supply and long-term manufacturing continuity.
Supply support for AT26DF161A-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, acquired by Dialog Semiconductor in 2020, specialized in low-power, high-reliability non-volatile memory solutions for industrial and IoT applications.
The AT26DF161A-SSU belongs to Adesto's DataFlash® family, engineered specifically for embedded code execution and secure data logging in 3.3V systems with stringent power and endurance requirements.
FAQ
What is the maximum SPI clock frequency supported by the AT26DF161A-SSU?
The AT26DF161A-SSU supports a maximum clock frequency of 70 MHz for read operations using the 0Bh opcode. This enables high-speed data streaming in applications such as firmware loading and real-time logging. The device also supports a low-frequency read mode (03h opcode) for slower clock domains, maintaining compatibility across diverse host controller designs while ensuring timing margin integrity.
Does the AT26DF161A-SSU require a separate VPP voltage for programming or erase operations?
No, the AT26DF161A-SSU performs all program and erase operations using only the main VCC supply (2.7V–3.6V). It integrates an internal charge pump to generate the necessary high-voltage programming pulses, eliminating the need for external VPP circuitry or additional power rails - simplifying board design and reducing BOM cost in space-constrained embedded systems.
How many physical sectors does the AT26DF161A-SSU have, and what is their size?
The AT26DF161A-SSU contains thirty-two 64-Kbyte physical sectors, totaling 2 MBytes of addressable memory. Each sector can be individually protected or unprotected via hardware (WP pin) or command (36h/39h), enabling secure partitioning of bootloader, application, and user data - a key requirement for certified firmware update architectures in industrial and medical devices.
What is the purpose of the HOLD pin on the AT26DF161A-SSU?
The HOLD pin on the AT26DF161A-SSU temporarily suspends SPI communication without deselecting the device or resetting internal state. When asserted (low), it ignores SCK transitions and SI data while placing SO in high-impedance - allowing the host MCU to service interrupts or perform other tasks mid-transfer. This preserves transaction context and avoids reinitialization delays, improving real-time responsiveness in time-critical embedded applications.
Is the AT26DF161A-SSU RoHS compliant and halogen-free?
Yes, the AT26DF161A-SSU complies with RoHS Directive 2011/65/EU and is halogen-free (Pb-free, Br-free, Cl-free per IEC 61249-2-21). Its 8-lead SOIC package uses green molding compound and matte-tin lead finish, meeting environmental requirements for industrial, medical, and automotive end equipment without compromising solderability or thermal performance.
AT26DF161A-SSU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 16Mbit
- Memory Organization:
- 256 Bytes x 8192 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
AT26DF161A-SSU FAQ
1.How can I place an order for AT26DF161A-SSU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT26DF161A-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 AT26DF161A-SSU reliable?
The price and inventory of AT26DF161A-SSU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT26DF161A-SSU is usually 5 days.
3.What payment methods are accepted for AT26DF161A-SSU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT26DF161A-SSU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT26DF161A-SSU?
AT26DF161A-SSU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT26DF161A-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 AT26DF161A-SSU?
For technical support, including AT26DF161A-SSU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT26DF161A-SSU requirements.
6.How does Aetrix verify that AT26DF161A-SSU is sourced from the original manufacturer or authorized distributors?
All AT26DF161A-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 AT26DF161A-SSU meets industry standards.
7.What is the process for return or replacement of AT26DF161A-SSU?
All AT26DF161A-SSU units undergo pre-shipment inspection (PSI). If there is an issue with AT26DF161A-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 AT26DF161A-SSU part is unused and in its original packaging.
Return procedure for AT26DF161A-SSU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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