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Microchip Technology AT93C66A-10SU-2.7-T
- Part No.:
- AT93C66A-10SU-2.7-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT93C66A-10SU-2.7-T.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,630
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Product details
Overview
AT93C66A-10SU-2.7-T from Microchip Technology (formerly Atmel) is a 4-kbit serial EEPROM with three-wire interface, user-selectable 512×8 or 256×16 organization via ORG pin, 2.7V–5.5V supply operation, 2 MHz max clock rate at 5V, and self-timed write cycle ≤10 ms. It is used for configuration storage in industrial controllers, embedded system boot parameters, and sensor calibration data retention.
For engineers reviewing the AT93C66A-10SU-2.7-T datasheet, AT93C66A-10SU-2.7-T pinout, AT93C66A-10SU-2.7-T application, or AT93C66A-10SU-2.7-T equivalent, key selection considerations include voltage range compatibility (2.7–5.5 V), x8/x16 organization flexibility, 1 million write endurance, 100-year data retention, and JEDEC SOIC-8 package footprint.
Technical Context
The AT93C66A-10SU-2.7-T implements a synchronous three-wire serial interface (CS, SK, DI/DO) with instruction-based command set including READ, WRITE, ERASE, EWEN, EWDS, ERAL, and WRAL. Addressing supports 9-bit (x8 mode) or 8-bit (x16 mode) addressing with automatic sequential read capability.
It features dual-voltage support (2.7–5.5 V), internal organization selection via ORG pin (VCC = x16, GND = x8), and Ready/Busy status reporting on DO during write/erase cycles. Write enable state must be explicitly entered via EWEN before programming, and disabled via EWDS to prevent accidental writes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16 words), enabling compact nonvolatile storage for firmware flags or device IDs |
| Supply Voltage | 2.7 V to 5.5 V - compatible with 3.3 V and 5 V logic systems without level shifting |
| Max Clock Rate | 2 MHz at VCC = 5 V - supports fast configuration reads in time-critical boot sequences |
| Write Cycle Time | ≤10 ms - enables predictable timing budgeting for firmware update routines |
| Endurance | 1 million write cycles - suitable for dynamic parameter logging in industrial HMI or metering applications |
| Data Retention | 100 years at TA ≤ 85 °C - ensures long-term reliability in unattended equipment |
| Operating Temp | −40 °C to +85 °C - qualified for industrial temperature range deployment |
Pinout & Package
AT93C66A-10SU-2.7-T is supplied in an 8-lead JEDEC SOIC (8S1) package, 0.150" wide body, RoHS-compliant, green finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must be held low for entire instruction sequence; high state places DO in high-impedance or outputs Ready/Busy |
| SK | Serial Clock | Synchronous edge-triggered clock input; rising edge latches DI, falling edge clocks DO; tSKH/tSKL ≥250 ns min at 2.7 V |
| DI | Data Input | Serial command and address/data input; accepts Start Bit (1), Op Code, address, and data bits per instruction |
| DO | Data Output | Serial data output during READ; outputs Ready/Busy status (1 = ready, 0 = busy) when CS goes high mid-cycle |
| GND | Ground | Reference return path for VCC and all I/O signals; requires low-impedance connection to minimize noise coupling |
| VCC | Power Supply | Primary power rail (2.7–5.5 V); powers internal logic and memory array; decoupling capacitor required near pin |
| ORG | Organization Select | Configures memory map: tied to VCC → 256×16 (x16), tied to GND → 512×8 (x8); unconnected defaults to x16 via internal 1 MΩ pull-up |
| NC | No Connect | Internally unused pin; must remain floating or grounded per PCB layout best practices; no electrical function |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configurable x8 or x16 word width via ORG pin, eliminating need for software remapping or external logic |
| Self-timed write cycle | No external timing control needed; internal circuitry manages erase/write duration (≤10 ms), simplifying host firmware design |
| Three-wire serial interface | Minimal pin count (CS/SK/DI/DO shared) reduces PCB routing complexity and MCU GPIO usage versus SPI or I²C |
| Write protection architecture | Explicit EWEN/EWDS instruction sequence prevents accidental writes, enhancing field reliability in deployed systems |
| Industrial temperature rating | −40 °C to +85 °C operation validated across full voltage range, supporting use in factory automation and outdoor electronics |
Applications
| Industrial PLC Configuration Storage | Embedded System Boot Parameter Retention |
|---|---|
Use Scenario: Storing I/O mapping tables, PID tuning constants, and alarm thresholds in programmable logic controllers operating in factory environments. IC Role / Device Role / Timing Role: Nonvolatile configuration register providing persistent settings accessible during cold start and runtime reconfiguration. Use Value: Enables deterministic boot behavior and field-updatable logic without requiring battery-backed SRAM or external flash management. | Use Scenario: Holding bootloader configuration flags, secure boot keys, and hardware revision identifiers in ARM Cortex-M based edge devices. IC Role / Device Role / Timing Role: Dedicated serial EEPROM accessed early in boot sequence to configure memory remapping and peripheral initialization. Use Value: Reduces dependency on main processor's internal flash wear and avoids contention during firmware updates. |
| Sensor Calibration Data Archive | Consumer Appliance User Preference Storage |
Use Scenario: Recording factory-calibrated offset/gain coefficients and temperature compensation curves for analog sensor modules in HVAC and instrumentation. IC Role / Device Role / Timing Role: High-reliability data archive with 1M write cycles, accessed only during sensor commissioning or recalibration events. Use Value: Guarantees calibration integrity over product lifetime without degradation from frequent writes typical of flash-based alternatives. | Use Scenario: Saving user-selected display brightness, timer presets, and language preferences in smart kitchen appliances with infrequent UI interaction. IC Role / Device Role / Timing Role: Low-power, low-pin-count nonvolatile memory interfaced directly to 8-bit microcontrollers with minimal firmware overhead. Use Value: Achieves <1 µA standby current at 1.8 V, extending battery life in cordless or energy-harvesting variants. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95640-DRMN6TP/K | 4-kbit SPI interface (4-wire), 1.8–5.5 V, 20 MHz max clock, 5 ms write cycle, same JEDEC SOIC-8 package | Requires SPI master instead of custom 3-wire driver; faster throughput but higher pin count | Select if existing design uses SPI peripherals and requires higher bandwidth than AT93C66A-10SU-2.7-T's 2 MHz limit |
| AT25640B-MAHL-T | 4-kbit SPI interface, 1.8–5.5 V, 20 MHz, 5 ms write, 1M endurance, same SOIC-8, but newer generation with enhanced ESD robustness | Drop-in SPI replacement; not pin-compatible with AT93C66A-10SU-2.7-T's 3-wire interface | Choose for new designs prioritizing vendor longevity and extended lifecycle support beyond AT93C66A-10SU-2.7-T's "Not Recommended for New Design" status |
Compared with M95640-DRMN6TP/K and AT25640B-MAHL-T, the AT93C66A-10SU-2.7-T offers unique 3-wire simplicity and legacy compatibility but lacks SPI speed and modern qualification; its ORG-pin flexibility remains unmatched among direct alternatives.
Availability
AT93C66A-10SU-2.7-T is available at Aetrix Electronics and suitable for industrial PLCs, embedded boot loaders, and sensor calibration systems requiring stable component supply and long-term obsolescence planning.
Supply support for AT93C66A-10SU-2.7-T 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 acquired Atmel in 2016 and maintains legacy EEPROM product lines with full documentation and support.
The AT93C66A-10SU-2.7-T belongs to Microchip's legacy serial EEPROM family, designed for cost-sensitive, low-pin-count applications where 3-wire simplicity and proven reliability outweigh newer interface requirements.
FAQ
What is the maximum clock frequency supported by AT93C66A-10SU-2.7-T?
The AT93C66A-10SU-2.7-T supports up to 2 MHz at VCC = 5.0 V. At 2.7 V, the maximum clock frequency is 1 MHz, and at 1.8 V it drops to 0.25 MHz per AC characteristics table. These limits ensure reliable setup/hold timing for DI and DO signals across voltage ranges.
How does the ORG pin affect memory organization in AT93C66A-10SU-2.7-T?
In AT93C66A-10SU-2.7-T, connecting ORG to VCC selects 256 × 16-bit organization (16-bit words), while tying ORG to GND selects 512 × 8-bit organization (8-bit words). If left unconnected, the internal 1 MΩ pull-up defaults to x16 mode. This hardware-selectable mapping eliminates software configuration overhead.
Is AT93C66A-10SU-2.7-T suitable for automotive applications?
No. AT93C66A-10SU-2.7-T is specified for industrial temperature range (−40 °C to +85 °C) and is not qualified to AEC-Q100 standards. Microchip's official documentation states their EEPROM products are "not intended, authorized, or warranted for use in automotive applications." Use automotive-grade alternatives like the 25AA640A for such use cases.
What is the write endurance and data retention specification for AT93C66A-10SU-2.7-T?
The AT93C66A-10SU-2.7-T guarantees 1 million write/erase cycles and 100 years of data retention at TA ≤ 85 °C. These values are characterized (not 100% tested) per datasheet Note 1, and apply across the full 2.7–5.5 V operating range under recommended conditions.
Does AT93C66A-10SU-2.7-T require a separate erase cycle before writing?
No. The AT93C66A-10SU-2.7-T performs automatic erase-before-write internally. A WRITE instruction initiates a self-timed cycle that erases the target location and programs new data in one atomic operation. No explicit ERASE instruction is needed unless selective single-location erasure is required.
AT93C66A-10SU-2.7-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 4Kbit
- Memory Organization:
- 512 x 8, 256 x 16
- Memory Interface:
- 3-Wire Serial
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 10ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT93C66A-10SU-2.7-T FAQ
1.How can I place an order for AT93C66A-10SU-2.7-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66A-10SU-2.7-T 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 AT93C66A-10SU-2.7-T reliable?
The price and inventory of AT93C66A-10SU-2.7-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT93C66A-10SU-2.7-T is usually 5 days.
3.What payment methods are accepted for AT93C66A-10SU-2.7-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66A-10SU-2.7-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66A-10SU-2.7-T?
AT93C66A-10SU-2.7-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66A-10SU-2.7-T 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 AT93C66A-10SU-2.7-T?
For technical support, including AT93C66A-10SU-2.7-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66A-10SU-2.7-T requirements.
6.How does Aetrix verify that AT93C66A-10SU-2.7-T is sourced from the original manufacturer or authorized distributors?
All AT93C66A-10SU-2.7-T 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 AT93C66A-10SU-2.7-T meets industry standards.
7.What is the process for return or replacement of AT93C66A-10SU-2.7-T?
All AT93C66A-10SU-2.7-T units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66A-10SU-2.7-T, 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 AT93C66A-10SU-2.7-T part is unused and in its original packaging.
Return procedure for AT93C66A-10SU-2.7-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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