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Renesas AT26DF161A-SU
- Part No.:
- AT26DF161A-SU
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT26DF161A-SU.pdf
- Description:
- IC FLASH 16MBIT SPI 70MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,406
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Product details
Overview
AT26DF161A-SU from Microchip Technology is a 16-Mbit serial Flash memory IC designed for code shadowing and embedded data storage in 2.7V–3.6V systems. It supports SPI Modes 0/3, delivers up to 70 MHz clock frequency, features uniform 4/32/64-Kbyte erase blocks, and provides hardware write protection via WP pin - deployed in industrial controllers and firmware-updatable IoT edge nodes.
For engineers reviewing the AT26DF161A-SU datasheet, AT26DF161A-SU pinout, AT26DF161A-SU application, or AT26DF161A-SU equivalent, this page delivers verified electrical specs, sector protection behavior, Deep Power-down current (10 µA), JEDEC ID read capability, and real-world use context for firmware storage, boot code retention, and field-upgradable parameter tables.
Technical Context
The AT26DF161A-SU implements a SPI-compatible serial interface with rising-edge input latch (SCK) and falling-edge output clocking (SO), supporting dual read opcodes (0Bh/03h) for high- and low-frequency operation. Its internal address counter enables continuous read and sequential program modes without repeated address transmission.
Memory architecture comprises thirty-two 64-Kbyte physical sectors, each individually protectable via hardware (WP pin) or command-based locking. Erase granularity spans 4-Kbyte blocks (smallest unit), 32-Kbyte blocks, 64-Kbyte blocks, and full-chip erase - optimized to minimize wasted space in mixed code/data layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 16 Mbit (2 MByte) - sufficient for full bootloader + application firmware + configuration tables in compact embedded designs |
| Supply Voltage | 2.7V–3.6V - single-supply operation compatible with 3.3V logic rails; no VPP required for programming/erase |
| Max Clock Frequency | 70 MHz - enables fast firmware loading and high-throughput parameter updates over SPI |
| Erase Granularity | 4-Kbyte blocks - allows fine-grained patching of code modules without disturbing adjacent firmware sections |
| Endurance | 100,000 program/erase cycles - supports frequent field firmware updates across product lifetime |
| Data Retention | 20 years at 85°C - ensures long-term reliability of stored calibration data and security keys |
| Deep Power-down Current | 10 µA typical - reduces system standby power in battery-powered sensors and portable devices |
Pinout & Package
AT26DF161A-SU is available in two RoHS-compliant packages: 8-lead SOIC (208-mil wide) and 8-pad MLF (6 × 5 × 1.00 mm). Both share identical pin functions and ordering (CS, SO, WP, GND, VCC, HOLD, SCK, SI).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select input | Active-low enable; must transition high→low to initiate any command; deassertion halts ongoing operations and places SO in high-Z |
| SCK | Serial clock input | Controls timing: data latched on rising edge (SI), data output on falling edge (SO); supports SPI Modes 0 and 3 |
| SI | Serial input | Receives opcodes, addresses, and program data; MSB-first; requires complete byte alignment on CS deassertion |
| SO | Serial output | Transmits read data, status register contents, and JEDEC IDs; high-impedance when CS is deasserted |
| WP | Write Protect input | Hardware lock for protected sectors; internally pulled-high; low assertion enables global sector protection override |
| HOLD | Communication pause input | Halts SPI transfer without deselecting device; requires CS asserted and SCK low to activate; preserves internal state during bus arbitration |
| VCC | Power supply | 2.7V–3.6V main supply; powers all logic and memory array; invalid voltage causes undefined behavior |
| GND | Ground reference | System ground connection; required for stable operation and noise immunity in mixed-signal environments |
Key Features
| Feature | Design Value |
|---|---|
| Flexible erase architecture | Four erase granularities (4/32/64-Kbyte blocks + full chip) reduce wasted memory in mixed code/data partitions |
| Individual sector protection | 32 × 64-Kbyte physical sectors can be locked/unlocked independently - enables safe in-field firmware patching |
| Sequential Program Mode | Eliminates repeated address transmission for consecutive byte writes - cuts SPI overhead by >40% vs. discrete byte programming |
| Automatic failure reporting | EPE bit in Status Register flags failed program/erase operations - enables robust error recovery in safety-critical firmware updates |
| JEDEC-standard ID read | 9Fh opcode returns manufacturer (0x1F) and device (0x46) IDs - simplifies automated BOM verification and supply-chain traceability |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader Retention |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers operating across -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Non-volatile code storage with hardware write protection to prevent accidental corruption during brown-out events. Use Value: 4-Kbyte erase blocks allow patching of individual function blocks without reprogramming entire firmware image - reducing update time by 65%. |
Use Scenario: Holding certified bootloader and cryptographic keys in Class II medical instruments requiring FDA-compliant firmware integrity. IC Role / Device Role / Timing Role: Secure, tamper-resistant firmware repository with Global Protect capability for manufacturing lockdown. Use Value: Hardware-controlled WP pin prevents runtime modification of bootloader region - meeting IEC 62304 software safety requirements. |
| Smart Meter Parameter Tables | Automotive Telematics OTA Updates |
Use Scenario: Storing tariff schedules, calibration coefficients, and utility-specific configuration data in ANSI C12.22-compliant electricity meters. IC Role / Device Role / Timing Role: Field-updatable data storage with sector-level protection to isolate critical calibration parameters from user-modifiable settings. Use Value: 32-Kbyte block erase enables atomic update of full tariff table without interrupting metering accuracy - zero downtime during firmware sync. |
Use Scenario: Hosting vehicle firmware images and ECU configuration profiles in cellular-connected telematics control units (TCUs). IC Role / Device Role / Timing Role: High-reliability code storage supporting AEC-Q100 Grade 2 temperature range and 100K endurance for multi-year OTA cycles. Use Value: 70 MHz SPI interface accelerates download of 1.2 MB firmware patches - achieving sub-90-second update windows over LTE Cat-M1. |
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-SH-B | Same 16-Mbit density and SPI interface, but uses newer process node; supports 85 MHz max clock and deeper power-down (5 µA) | Higher performance and lower standby power; pinout and command set fully compatible with AT26DF161A-SU | Select for new designs requiring extended speed margin or ultra-low-power sleep modes |
| W25Q16JVSSIQ | 16-Mbit Quad SPI Flash; supports standard, dual, and quad I/O modes; 104 MHz clock; 2.7–3.6V supply | Delivers 4× higher throughput via Quad SPI; lacks hardware WP/HOLD pins - protection managed via status register only | Choose when system MCU supports QSPI peripheral and bandwidth >30 MB/s is required for firmware streaming |
Compared with AT26DF161A-SU, AT25DF161-SH-B offers drop-in compatibility with improved speed and power efficiency, while W25Q16JVSSIQ trades pin-count simplicity for significantly higher data rates - making it suitable only where QSPI hardware support exists and legacy SPI-only designs are not constrained.
Availability
AT26DF161A-SU is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and smart energy metering requiring stable component supply across extended product lifecycles.
Supply support for AT26DF161A-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
Microchip Technology is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and non-volatile memory solutions for industrial, automotive, and communications markets.
The AT26DF161A-SU belongs to Microchip's DataFlash® family - engineered specifically for reliable, low-voltage serial code and data storage in resource-constrained embedded systems with stringent endurance and retention requirements.
FAQ
What is the maximum SPI clock frequency supported by the AT26DF161A-SU?
The AT26DF161A-SU supports a maximum clock frequency of 70 MHz for standard read and program operations. This rating applies under specified VCC (2.7–3.6 V) and temperature (-40°C to +85°C) conditions. The device also supports a low-frequency read mode (03h opcode) with reduced timing constraints for slower host controllers - ensuring interoperability across diverse MCU platforms while maintaining full AT26DF161A-SU functionality.
Does the AT26DF161A-SU require a separate programming voltage (VPP)?
No, the AT26DF161A-SU does not require a separate programming or erase voltage. All read, program, and erase operations execute using only the main VCC supply (2.7V–3.6V). This eliminates external charge-pump circuitry and simplifies PCB layout - a key design advantage of the AT26DF161A-SU in space-constrained embedded applications where board area and BOM count are critical.
How many physical sectors does the AT26DF161A-SU have, and what is their size?
The AT26DF161A-SU contains thirty-two 64-Kbyte physical sectors, totaling 2 MBytes of addressable memory. Each sector can be individually protected or unprotected via command or hardware (WP pin). Sector boundaries align with 64-Kbyte offsets (e.g., 0x000000–0x00FFFF, 0x010000–0x01FFFF), enabling precise isolation of firmware modules and configuration data - a core architectural feature of the AT26DF161A-SU.
Can the AT26DF161A-SU be used in automotive applications?
The AT26DF161A-SU is rated for the full industrial temperature range (-40°C to +85°C) and meets RoHS compliance, but it is not qualified to AEC-Q100 standards. While it has been deployed in non-safety-critical automotive subsystems (e.g., infotainment UI storage), Microchip does not certify the AT26DF161A-SU for under-hood or ASIL-B/C applications. For such use cases, designers should select AEC-Q100-qualified alternatives - the AT26DF161A-SU is intended for industrial and commercial environments.
What happens if the WP pin is left unconnected on the AT26DF161A-SU?
The WP pin on the AT26DF161A-SU is internally pulled high, so leaving it floating defaults to "unprotected" mode - allowing all protection commands to function normally. However, Microchip recommends externally tying WP to VCC for noise immunity and deterministic behavior. Floating WP may cause intermittent protection failures in electrically noisy environments, compromising the reliability of sector-locking features critical to secure AT26DF161A-SU deployments.
AT26DF161A-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:
- 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-SU FAQ
1.How can I place an order for AT26DF161A-SU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT26DF161A-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 AT26DF161A-SU reliable?
The price and inventory of AT26DF161A-SU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT26DF161A-SU is usually 5 days.
3.What payment methods are accepted for AT26DF161A-SU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT26DF161A-SU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT26DF161A-SU?
AT26DF161A-SU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT26DF161A-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 AT26DF161A-SU?
For technical support, including AT26DF161A-SU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT26DF161A-SU requirements.
6.How does Aetrix verify that AT26DF161A-SU is sourced from the original manufacturer or authorized distributors?
All AT26DF161A-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 AT26DF161A-SU meets industry standards.
7.What is the process for return or replacement of AT26DF161A-SU?
All AT26DF161A-SU units undergo pre-shipment inspection (PSI). If there is an issue with AT26DF161A-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 AT26DF161A-SU part is unused and in its original packaging.
Return procedure for AT26DF161A-SU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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