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Microchip Technology AT26DF161A-MU
- Part No.:
- AT26DF161A-MU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
AT26DF161A-MU.pdf
- Description:
- IC FLASH 16MBIT SPI 70MHZ 8VDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,107
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Product details
Overview
AT26DF161A-MU 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-MU datasheet, AT26DF161A-MU pinout, AT26DF161A-MU application, or AT26DF161A-MU equivalent, key selection considerations include sector-level hardware protection granularity, Deep Power-down current (10 µA), JEDEC-compliant ID read, endurance (100,000 cycles), and dual-package availability (8-SOIC/8-MLF).
Technical Context
The AT26DF161A-MU implements a SPI-compatible serial interface with rising-edge input latch (SCK) and falling-edge output clocking, supporting both high-speed (0Bh opcode) and low-frequency (03h opcode) read modes. Its internal address counter enables sequential reads and page programming without repeated address retransmission.
Memory architecture includes thirty-two 64-Kbyte physical sectors, each individually protectable via hardware (WP pin) or command-based locking. Erase operations are internally self-timed and validated via Status Register polling (EPE bit for program failure, WIP bit for busy state), eliminating need for fixed timing delays.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 16 Mbit (2 MByte) - sufficient for boot code + configuration + firmware patch storage in resource-constrained microcontrollers. |
| Supply Voltage | 2.7V–3.6V - single-supply operation compatible with 3.3V logic domains; no VPP required for programming/erase. |
| Max Clock Frequency | 70 MHz - enables fast read throughput (up to ~8.75 MB/s theoretical) for real-time code execution from Flash. |
| Erase Granularity | 4 Kbyte / 32 Kbyte / 64 Kbyte blocks + full chip - allows precise firmware module updates without erasing unrelated code or data segments. |
| Endurance & Retention | 100,000 program/erase cycles / 20 years data retention - validated for field-deployed devices requiring long-term reliability. |
| Power Consumption | 5 mA active read current (typ), 10 µA deep power-down current (typ) - supports battery-backed or energy-harvesting applications. |
| Operating Temperature | −40°C to +85°C - meets full industrial temperature range requirements for factory automation and outdoor electronics. |
Pinout & Package
AT26DF161A-MU is available in two RoHS-compliant, green packages: 8-lead SOIC (208-mil wide) and 8-pad MLF (6 × 5 × 1.00 mm). Both packages share identical pin functions and ordering suffix "-MU" denotes the MLF variant per Microchip's packaging nomenclature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; rising edge ends all operations and places SO in high-impedance state - essential for multi-device SPI bus arbitration. |
| SCK | Serial Clock | Input clock controlling data timing; rising edge latches SI, falling edge clocks SO - defines SPI Mode 0/3 compatibility. |
| SI | Serial Input | Command, address, and data input line; MSB-first protocol requires strict byte alignment on CS deassertion. |
| SO | Serial Output | Data output during read/status commands; high-impedance when CS is deasserted - prevents bus contention. |
| WP | Write Protect | Hardware lock control; low-active signal enables sector-level physical write inhibition - complements software protection for critical firmware regions. |
| HOLD | Hold | Pauses ongoing SPI transfers without deselecting device; requires CS asserted and SCK low - preserves context during interrupt servicing. |
| VCC | Power Supply | 2.7V–3.6V supply input; invalid voltage causes spurious behavior - requires local decoupling per layout guidelines. |
| GND | Ground | Reference return path for all signals and power - must be connected to system ground plane with low-inductance routing. |
Key Features
| Feature | Design Value |
|---|---|
| Flexible Erase Architecture | Four granularities (4/32/64-Kbyte + full chip) reduce wasted space vs. monolithic-block Flash - improves memory utilization for mixed code/data layouts. |
| Individual Sector Protection | 32 × 64-Kbyte sectors support independent lock/unlock; Global Protect/Unprotect simplifies factory programming - eliminates risk of accidental overwrite during field updates. |
| Deep Power-down Mode | 10 µA typical current draw extends battery life in always-on sensor nodes - resumed via ABh command without reset or reinitialization. |
| Intelligent Program/Erase Validation | Automatic EPE (Erase/Program Error) flagging in Status Register enables fail-safe firmware update verification - avoids silent corruption in mission-critical applications. |
| JEDEC Standard ID Read | 9Fh command returns manufacturer (0x1F) and device ID (0x47) - ensures runtime compatibility detection across supply chain revisions and second-source alternatives. |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Storing ladder logic programs and I/O mapping tables in programmable logic controllers subject to frequent field updates. IC Role / Device Role / Timing Role: Non-volatile code and parameter storage with hardware-sector locking to prevent corruption during partial reprogramming. Use Value: 4-Kbyte erase blocks allow updating individual function modules without erasing safety-critical watchdog routines or calibration data. |
Use Scenario: Retaining patient-specific calibration profiles and regulatory audit logs in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, long-retention data archive with Global Protect enabled during power-up to block unauthorized writes. Use Value: 20-year data retention and 100,000-cycle endurance ensure compliance with FDA 21 CFR Part 11 record-keeping requirements. |
| Automotive Telematics Bootloader | Smart Energy Meter Firmware |
Use Scenario: Hosting secure bootloader and OTA update staging area in vehicle infotainment gateways operating across −40°C to +85°C. IC Role / Device Role / Timing Role: Primary boot image storage with Deep Power-down mode reducing quiescent current during sleep states. Use Value: Industrial temperature rating and 10 µA deep power-down current meet ISO 16750-4 automotive environmental and power budget constraints. |
Use Scenario: Storing tariff schedules, firmware patches, and tamper-event logs in ANSI C12.22-compliant electricity meters with 15+ year field life. IC Role / Device Role / Timing Role: Dual-role memory for executable code and encrypted usage history - protected via WP pin during meter certification testing. Use Value: Hardware write protection prevents malicious or accidental overwrites of revenue-grade billing parameters during field maintenance. |
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-MU | Successor device with identical density, voltage, and pinout; adds Quad SPI support and faster 85 MHz clock. | Enables higher throughput in new designs requiring quad I/O or enhanced security features (e.g., secure boot). | Select AT25DF161-MU for new designs; AT26DF161A-MU remains valid for legacy compatibility and cost-sensitive volume production. |
| SST25VF016B-20-4I-SAE | 16-Mbit SPI Flash with 20 MHz max clock, 3.0V–3.6V supply, and 30 µA deep power-down current. | Limited to lower-speed interfaces; lacks 4-Kbyte erase granularity and hardware WP/HOLD pins. | Use SST25VF016B only where timing margins permit slower access and sector protection flexibility is not required. |
Compared with AT25DF161-MU and SST25VF016B-20-4I-SAE, the AT26DF161A-MU offers optimal balance of fine-grained erase control, ultra-low deep power-down current, and mature industrial qualification - making it preferred for field-upgradable embedded systems where firmware integrity and battery life are co-prioritized.
Availability
AT26DF161A-MU is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and automotive telematics requiring stable component supply, long-lifecycle support, and traceable green packaging.
Supply support for AT26DF161A-MU 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 AT26DF161A-MU belongs to Microchip's DataFlash® family, engineered specifically for reliable code shadowing and embedded data logging in 3.3V systems with stringent power and endurance requirements.
FAQ
What is the maximum SPI clock frequency supported by the AT26DF161A-MU?
The AT26DF161A-MU supports a maximum clock frequency of 70 MHz for standard read operations using the 0Bh opcode. This enables high-throughput code execution and firmware loading. The device also supports a low-frequency read mode (03h opcode) for systems requiring reduced EMI or operating below 20 MHz. All timing specifications are guaranteed across the full industrial temperature range (−40°C to +85°C) and 2.7V–3.6V supply.
Does the AT26DF161A-MU require a separate programming voltage (VPP)?
No, the AT26DF161A-MU does not require a separate programming or erase voltage. All read, program, and erase operations are performed using the same 2.7V–3.6V VCC supply. This simplifies power design and eliminates need for charge pumps or external voltage generators - a key advantage over older parallel Flash architectures. The device integrates internal high-voltage generation circuitry compliant with JEDEC standards.
How many physical sectors does the AT26DF161A-MU have, and what is their size?
The AT26DF161A-MU contains thirty-two 64-Kbyte physical sectors, totaling 2,097,152 bytes (16 Mbit). Each sector can be individually protected or unprotected via hardware (WP pin) or command (36h/39h opcodes). Sector boundaries align with 64-Kbyte erase blocks (D8h command), and smaller 4-Kbyte (20h) and 32-Kbyte (52h) erase blocks are implemented within those sectors for flexible data management.
What is the purpose of the HOLD pin on the AT26DF161A-MU?
The HOLD pin on the AT26DF161A-MU allows temporary suspension of 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 - preserving ongoing operations like internal erase or program cycles. This is especially useful in interrupt-driven systems where host MCU must service higher-priority tasks mid-transfer without aborting Flash operations.
Can the AT26DF161A-MU be used in place of the AT25DF161-MU?
The AT26DF161A-MU is not a direct drop-in replacement for the AT25DF161-MU. While both share identical pinout, density, voltage range, and core SPI functionality, the AT25DF161-MU adds Quad SPI support, faster 85 MHz timing, and enhanced security registers. For new designs, Microchip recommends AT25DF161-MU; however, AT26DF161A-MU remains fully functional in legacy systems where Quad SPI or extended features are unused.
AT26DF161A-MU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- Packaging:
- Tray
- 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-VDFN (6x5)
AT26DF161A-MU FAQ
1.How can I place an order for AT26DF161A-MU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT26DF161A-MU 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-MU reliable?
The price and inventory of AT26DF161A-MU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT26DF161A-MU is usually 5 days.
3.What payment methods are accepted for AT26DF161A-MU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT26DF161A-MU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT26DF161A-MU?
AT26DF161A-MU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT26DF161A-MU 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-MU?
For technical support, including AT26DF161A-MU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT26DF161A-MU requirements.
6.How does Aetrix verify that AT26DF161A-MU is sourced from the original manufacturer or authorized distributors?
All AT26DF161A-MU 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-MU meets industry standards.
7.What is the process for return or replacement of AT26DF161A-MU?
All AT26DF161A-MU units undergo pre-shipment inspection (PSI). If there is an issue with AT26DF161A-MU, 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-MU part is unused and in its original packaging.
Return procedure for AT26DF161A-MU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT26DF161A-MU Tags
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