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Microchip Technology AT26DF161-SU
- Part No.:
- AT26DF161-SU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT26DF161-SU.pdf
- Description:
- IC FLASH 16MBIT SPI 66MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,029
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Product details
Overview
AT26DF161-SU from Microchip Technology 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 66 MHz, features uniform 4/32/64-Kbyte erase blocks, and delivers 7 mA typical active read current with 4 µA deep power-down current.
For engineers reviewing the AT26DF161-SU datasheet, AT26DF161-SU pinout, AT26DF161-SU application, or AT26DF161-SU equivalent, this page provides verified technical context, real-world use cases, validated alternatives, and supply-ready sourcing guidance for industrial and consumer firmware storage designs.
Technical Context
The AT26DF161-SU implements a SPI-compatible serial interface with hardware-controlled write protection via dedicated WP pin and software-based sector locking using 16 × 128-Kbyte physical sectors. Its flexible erase architecture enables granular updates without full-chip erasure-critical for field firmware patching and secure data logging.
Internally, it uses an SRAM data buffer and intelligent programming/erasing algorithms that auto-detect failures (EPE bit) and report status via a readable Status Register. All operations-including Byte/Page Program (1–256 bytes), Block Erase (4/32/64-Kbyte), and Chip Erase-are self-timed and require prior Write Enable (06h) assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 16 Mbit (2 Mbyte) non-volatile Flash array with uniform sectoring |
| Supply Voltage | 2.7V–3.6V single supply-no VPP required for program/erase |
| Max Clock Frequency | 66 MHz SPI clock-enables high-throughput firmware reads in resource-constrained hosts |
| Erase Granularity | Four levels: 4-Kbyte, 32-Kbyte, 64-Kbyte blocks, and full chip-minimizes wasted space during partial updates |
| Endurance & Retention | 100,000 program/erase cycles and 20-year data retention-validated for long-life industrial deployments |
| Power Consumption | 7 mA typical active read current; 4 µA deep power-down-supports battery-backed or low-power IoT nodes |
| Operating Temperature | −40°C to +85°C industrial range-suitable for automotive infotainment and industrial HMI applications |
Pinout & Package
AT26DF161-SU is packaged in an 8-lead SOIC (200-mil wide) with standard SPI interface pins and hardware write protection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal-must transition high-to-low to start and low-to-high to end any operation |
| SCK | Serial Clock | Input clock controlling data flow; rising edge latches SI, falling edge clocks out SO |
| SI | Serial Input | Command, address, and data input line-MSB-first, synchronized to SCK rising edge |
| SO | Serial Output | Data output line-MSB-first, synchronized to SCK falling edge; high-impedance when CS deasserted |
| WP | Write Protect | Hardware lock control-low enables hardware sector protection; internally pulled high, can be left floating if unused |
| VCC | Power Supply | 2.7V–3.6V main supply-powers all internal logic and memory array |
| GND | Ground | Reference return path for VCC and all I/O signals |
| NC | No Connect | Unused pin-no internal connection; must remain unconnected per design |
Key Features
| Feature | Design Value |
|---|---|
| Flexible Erase Architecture | Supports 4-Kbyte, 32-Kbyte, 64-Kbyte block erases and full-chip erase-enables efficient firmware module updates without disturbing adjacent code or data |
| Individual Sector Protection | 16 × 128-Kbyte physical sectors with independent software lock/unlock-allows selective patching of bootloader while keeping application code secured |
| Hardware Write Protection | WP pin provides physical override of software protection-prevents accidental writes during system power-up or brown-out conditions |
| Automatic Failure Reporting | EPE (Erase/Program Error) bit in Status Register flags failed operations-eliminates need for external verification polling in safety-critical firmware updates |
| JEDEC ID Read Support | 9Fh command returns manufacturer (0x1F) and device (0x46) IDs-enables runtime device identification and BOM validation in production firmware |
Applications
| Firmware Code Storage | Data Logging |
|---|---|
Use Scenario: Storing boot firmware and application code in microcontroller-based medical devices where code integrity and update reliability are critical. IC Role / Device Role / Timing Role: Non-volatile serial Flash memory providing shadowed execution support-code is loaded into RAM at startup and executed from there. Use Value: Uniform 4-Kbyte erase blocks allow patching of individual diagnostic modules without reprogramming entire firmware image, reducing field update time and risk. | Use Scenario: Recording sensor calibration data and operational logs in industrial PLCs operating across extended temperature ranges. IC Role / Device Role / Timing Role: Dedicated data storage element with sector-level protection-calibration tables reside in locked sectors, logs in unlocked ones. Use Value: 16 individually protected 128-Kbyte sectors prevent corruption of factory-set parameters during routine log writes, ensuring traceability and regulatory compliance. |
| Consumer Electronics Boot Memory | Automotive Infotainment Update Storage |
Use Scenario: Holding boot loader and recovery images in smart home hubs requiring fast, reliable cold-start behavior. IC Role / Device Role / Timing Role: Primary SPI Flash for initial boot sequence-read at up to 66 MHz to minimize boot latency. Use Value: 7 mA typical read current and 4 µA deep power-down enable ultra-low standby consumption-extends battery life in always-on voice assistant devices. | Use Scenario: Storing over-the-air (OTA) firmware updates in vehicle head units before installation during maintenance windows. IC Role / Device Role / Timing Role: Secure update staging area-global protect/unprotect allows bulk OTA image loading followed by atomic activation. Use Value: Global Protect/Unprotect feature reduces manufacturing and service overhead-entire memory array can be unlocked once for image programming, then relocked before deployment. |
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 W25Q16JVSSIQ | 16-Mbit SPI Flash with Quad I/O support, 104 MHz max clock, 1.65–1.95V/2.7–3.6V dual supply | Requires Quad-mode configuration and voltage translation for 3.3V-only hosts; lacks hardware WP pin | Select when higher throughput or dual-voltage operation is needed; verify host SPI controller supports Quad commands |
| Cypress S25FL116K0XMFI001 | 16-Mbit SPI Flash with 85 MHz clock, 2.7–3.6V supply, no hardware WP pin, supports SFDP | Relies solely on software protection; no dedicated WP terminal for hardware lockout | Prefer for designs already using Cypress ecosystem tools or requiring SFDP-based auto-configuration |
Compared with W25Q16JVSSIQ and S25FL116K0XMFI001, the AT26DF161-SU offers unique hardware write protection via the WP pin and guaranteed 66 MHz operation across full industrial temperature range-making it optimal for safety-aware or legacy SPI host designs lacking Quad I/O capability.
Availability
AT26DF161-SU is available at Aetrix Electronics and suitable for firmware storage, embedded boot memory, and industrial data logging requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AT26DF161-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 consumer markets.
The AT26DF161-SU belongs to Microchip's DataFlash® family-designed specifically for high-reliability, low-pin-count serial Flash applications where code shadowing, modular firmware updates, and hardware-assisted data protection are essential.
FAQ
What is the maximum SPI clock frequency supported by the AT26DF161-SU?
The AT26DF161-SU supports a maximum SPI clock frequency of 66 MHz for standard read operations using the 0Bh opcode. This enables high-speed firmware loading in performance-sensitive embedded systems. The device also supports a lower-frequency read mode (03h opcode) for compatibility with slower host controllers, though timing margins and signal integrity must be verified per application layout.
Does the AT26DF161-SU require a separate programming voltage (VPP)?
No, the AT26DF161-SU does not require a separate programming voltage. All program and erase operations are performed using only the main VCC supply (2.7V–3.6V). This simplifies power design and eliminates the need for charge pumps or external VPP circuitry-reducing bill-of-materials cost and board space in compact embedded systems using the AT26DF161-SU.
How many physical sectors does the AT26DF161-SU have, and what is their size?
The AT26DF161-SU has sixteen 128-Kbyte physical sectors, each independently software-protectable. This structure supports secure partitioning of firmware (e.g., bootloader in one sector, application in another) and enables targeted updates without affecting protected regions. Sector boundaries align with erase block sizes (4/32/64-Kbyte), allowing precise memory management in the AT26DF161-SU.
Can the AT26DF161-SU be used in systems operating outside the industrial temperature range?
The AT26DF161-SU is specified and tested for operation across the full industrial temperature range of −40°C to +85°C. While some units may function outside this range, Microchip does not guarantee performance, endurance, or data retention beyond these limits. For automotive under-hood or extended-temperature applications, consult Microchip's qualified AEC-Q100 variants or validate the AT26DF161-SU under actual thermal stress conditions.
What happens if the WP pin is left unconnected on the AT26DF161-SU?
The WP pin on the AT26DF161-SU is internally pulled high, so leaving it unconnected defaults to hardware write protection disabled-allowing full software control of sector locking. However, Microchip recommends externally tying WP to VCC if hardware protection is not used, to prevent noise-induced glitches from inadvertently enabling protection. This ensures deterministic behavior during power-up and ESD events in production systems using the AT26DF161-SU.
AT26DF161-SU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- 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:
- 66 MHz
- Write Cycle Time - Word, Page:
- 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
AT26DF161-SU FAQ
1.How can I place an order for AT26DF161-SU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT26DF161-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 AT26DF161-SU reliable?
The price and inventory of AT26DF161-SU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT26DF161-SU is usually 5 days.
3.What payment methods are accepted for AT26DF161-SU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT26DF161-SU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT26DF161-SU?
AT26DF161-SU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT26DF161-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 AT26DF161-SU?
For technical support, including AT26DF161-SU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT26DF161-SU requirements.
6.How does Aetrix verify that AT26DF161-SU is sourced from the original manufacturer or authorized distributors?
All AT26DF161-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 AT26DF161-SU meets industry standards.
7.What is the process for return or replacement of AT26DF161-SU?
All AT26DF161-SU units undergo pre-shipment inspection (PSI). If there is an issue with AT26DF161-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 AT26DF161-SU part is unused and in its original packaging.
Return procedure for AT26DF161-SU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT26DF161-SU Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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AT24C08C-STUM-T
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