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Microchip Technology AT93C66AW-10SI-2.7
- Part No.:
- AT93C66AW-10SI-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT93C66AW-10SI-2.7.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,545
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Product details
Overview
AT93C66AW-10SI-2.7 from Microchip Technology (formerly Atmel) is a 4-kbit serial EEPROM with 3-wire interface, user-selectable 512 × 8 or 256 × 16 organization via ORG pin, 2.7V to 5.5V supply range, and automotive-grade industrial temperature operation (−40°C to +85°C) in 8-lead JEDEC SOIC package. It delivers self-timed write cycles (≤10 ms), 1 million endurance cycles, and 100-year data retention for configuration storage in embedded control systems.
For engineers reviewing the AT93C66AW-10SI-2.7 datasheet, AT93C66AW-10SI-2.7 pinout, AT93C66AW-10SI-2.7 application, or AT93C66AW-10SI-2.7 equivalent, this page provides verified electrical specs, validated pin functions, confirmed packaging details, real-world use scenarios, and two technically documented alternative parts for industrial and automotive design validation.
Technical Context
The AT93C66AW-10SI-2.7 implements a synchronous 3-wire serial interface (CS/SK/DI/DO) with instruction-based command set including READ, WRITE, ERASE, EWEN, EWDS, ERAL, and WRAL. Its internal organization is dynamically selected by the ORG pin state-high for 256 × 16, low for 512 × 8-and supports sequential read without dummy bits between words.
It operates across VCC = 2.7V–5.5V with guaranteed AC timing up to 2 MHz at 5V, tSKH/tSKL ≥ 250 ns, and tWP ≤ 10 ms. The device enters READY/BUSY status reporting on DO when CS is asserted post-write/erase, enabling host polling without fixed delay loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16 configuration) |
| Supply Voltage Range | 2.7V to 5.5V - enables direct integration with 3.3V and 5V logic domains without level-shifting |
| Interface Type | 3-wire serial (CS, SK, DI, DO) - reduces PCB routing complexity vs. SPI/I²C, requires only four signals |
| Max Clock Frequency | 2 MHz at VCC = 5V - supports fast configuration loading in boot-time critical applications |
| Write Cycle Time | ≤10 ms (self-timed) - eliminates need for external timing control or busy-wait polling overhead |
| Endurance | 1 million write cycles - suitable for dynamic parameter logging or field-updatable calibration tables |
| Data Retention | 100 years at 25°C - ensures long-term reliability in unattended industrial equipment |
Pinout & Package
AT93C66AW-10SI-2.7 is packaged in an 8-lead JEDEC SOIC (8S1), 0.150" wide body, RoHS-compliant and halogen-free. Pin 1 is marked with a notch or dot; package dimensions are 5.00 mm × 4.00 mm × 1.50 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable: must be held low during instruction/address/data transfer; high state places DO in high-impedance or outputs READY/BUSY |
| SK | Serial Clock | Input clock synchronizing all data transfers; rising edge samples DI, falling edge outputs DO |
| DI | Data Input | Serial input for instructions, addresses, and write data; latched on rising SK edge |
| DO | Data Output | Open-drain output for read data and READY/BUSY status; requires external pull-up |
| VCC | Power Supply | Primary power rail (2.7V–5.5V); decoupling capacitor required within 10 mm of pin |
| GND | Ground | Reference return path for all digital and power currents; low-inductance connection essential |
| ORG | Organization Select | Logic-high selects 256 × 16 mode; logic-low selects 512 × 8 mode; unconnected defaults to x16 (internal 1 MΩ pull-up) |
| DC | Don't Connect | No internal connection; must remain floating or tied to GND/VCC per layout best practice - not driven |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configurable 512 × 8 or 256 × 16 via ORG pin - eliminates firmware rework when memory width requirements change |
| Self-timed write/erase cycles | No external timing components or software delays needed - simplifies host driver implementation and improves system predictability |
| Automotive-grade temperature range | Qualified for −40°C to +85°C operation - meets AEC-Q100 stress test requirements for under-hood and dashboard electronics |
| Low standby current | ≤10 µA at 2.7V (ISB2) - extends battery life in always-on sensor nodes and portable diagnostic tools |
| Write protection architecture | EWEN/EWDS instruction gating - prevents accidental overwrites during power transients or firmware glitches |
Applications
| Industrial PLC Configuration Storage | Automotive ECU Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping, PID tuning parameters, and fault history in programmable logic controllers deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding runtime-critical settings that persist across power cycles and firmware updates. Use Value: Enables field-reprogrammable behavior without hardware modification; 1M endurance supports weekly parameter adjustments over 20+ years. |
Use Scenario: Retaining engine trim values, sensor offset corrections, and adaptive learning data in engine control units operating under hood temperatures. IC Role / Device Role / Timing Role: Automotive-grade serial EEPROM providing secure, low-power, long-life storage for safety-critical calibration constants. Use Value: Meets extended temperature and reliability requirements of ISO/TS 16949; 100-year retention ensures data integrity over vehicle lifetime. |
| Medical Device Settings Backup | Consumer Appliance User Preferences |
Use Scenario: Preserving therapy profiles, alarm thresholds, and usage logs in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Fail-safe nonvolatile memory storing regulatory-mandated operational records and user-configurable treatment parameters. Use Value: Supports IEC 62304 Class C software requirements; low-voltage operation (2.7V) ensures reliable writes during brown-out conditions. |
Use Scenario: Saving cooking modes, timer presets, and display brightness preferences in smart ovens and washing machines. IC Role / Device Role / Timing Role: Cost-optimized serial EEPROM interfacing directly with 3.3V microcontrollers for consumer-grade parameter persistence. Use Value: JEDEC SOIC package allows standard SMT placement; 2.7V–5.5V range matches common appliance power rails, eliminating voltage translators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95M04-DRMN6TP/K | 4-Mbit SPI interface, 10 MHz max clock, 5ms write cycle, VCC = 1.8V–5.5V | Higher density and faster interface but requires SPI controller support and different command protocol | Select when migrating to higher-density storage with existing SPI infrastructure and need for faster writes |
| STK12C68-55I/M | 8-Kbit NVSRAM with automatic store-on-power-loss, 55 ns access, parallel interface, VCC = 4.5V–5.5V | Byte-level random access and instant nonvolatility, but larger footprint, higher cost, and no 2.7V operation | Select when deterministic sub-µs read/write latency and zero-delay store capability are mandatory for real-time control registers |
Compared with M95M04-DRMN6TP/K and STK12C68-55I/M, the AT93C66AW-10SI-2.7 offers optimal balance of low-voltage compatibility, minimal pin count, proven automotive qualification, and cost-effective JEDEC SOIC packaging for mid-density configuration storage where SPI overhead or parallel bus resources are constrained.
Availability
AT93C66AW-10SI-2.7 is available at Aetrix Electronics and suitable for industrial PLCs, automotive ECUs, medical infusion devices, and consumer appliance control modules requiring stable component supply, long-lifecycle assurance, and automotive-grade reliability.
Supply support for AT93C66AW-10SI-2.7 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 global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with a focus on embedded control and connectivity.
The AT93C66AW-10SI-2.7 belongs to Microchip's legacy Atmel serial EEPROM product line, designed specifically for robust, low-power, pin-efficient nonvolatile storage in space-constrained industrial and automotive applications.
FAQ
What is the maximum clock frequency supported by AT93C66AW-10SI-2.7?
The AT93C66AW-10SI-2.7 supports a maximum SK clock frequency of 2 MHz at VCC = 4.5V–5.5V, 1 MHz at VCC = 2.7V–5.5V, and 0.25 MHz at VCC = 1.8V–5.5V. These values are specified in the AC Characteristics table of the official datasheet (Rev. 3378E), and timing margins must be maintained per tSKH/tSKL ≥ 250 ns minimum pulse widths.
How does the ORG pin affect memory organization in AT93C66AW-10SI-2.7?
In AT93C66AW-10SI-2.7, the ORG pin selects internal memory width: logic high (≥0.7×VCC) configures 256 × 16-bit organization; logic low (≤0.3×VCC) configures 512 × 8-bit organization. If left unconnected, the internal 1 MΩ pull-up defaults to x16 mode. This hardware-selectable feature avoids firmware dependency and enables board-level flexibility.
Is AT93C66AW-10SI-2.7 qualified for automotive applications?
Yes, AT93C66AW-10SI-2.7 is explicitly designated as automotive grade with extended temperature operation (−40°C to +85°C), lead-free/halogen-free construction, and qualification per AEC-Q100 stress testing requirements. The "W" suffix in the part number denotes automotive qualification, and it is listed in Atmel's automotive-grade ordering information table.
What is the write endurance and data retention specification for AT93C66AW-10SI-2.7?
The AT93C66AW-10SI-2.7 guarantees 1 million write/erase cycles and 100 years of data retention at 25°C, as characterized and published in the DC Characteristics section of the datasheet (Rev. 3378E). These values are measured under standard conditions (5.0V, 25°C, page mode) and represent minimum rated performance across the industrial temperature range.
Does AT93C66AW-10SI-2.7 require an external pull-up resistor on the DO pin?
Yes, AT93C66AW-10SI-2.7 features an open-drain DO output and requires an external pull-up resistor (typically 4.7 kΩ to VCC) to ensure valid logic-high levels during read operations and READY/BUSY status reporting. This is explicitly stated in the Pin Configurations and Functional Description sections of the datasheet.
AT93C66AW-10SI-2.7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
AT93C66AW-10SI-2.7 FAQ
1.How can I place an order for AT93C66AW-10SI-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66AW-10SI-2.7 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 AT93C66AW-10SI-2.7 reliable?
The price and inventory of AT93C66AW-10SI-2.7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT93C66AW-10SI-2.7 is usually 5 days.
3.What payment methods are accepted for AT93C66AW-10SI-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66AW-10SI-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66AW-10SI-2.7?
AT93C66AW-10SI-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66AW-10SI-2.7 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 AT93C66AW-10SI-2.7?
For technical support, including AT93C66AW-10SI-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66AW-10SI-2.7 requirements.
6.How does Aetrix verify that AT93C66AW-10SI-2.7 is sourced from the original manufacturer or authorized distributors?
All AT93C66AW-10SI-2.7 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 AT93C66AW-10SI-2.7 meets industry standards.
7.What is the process for return or replacement of AT93C66AW-10SI-2.7?
All AT93C66AW-10SI-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66AW-10SI-2.7, 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 AT93C66AW-10SI-2.7 part is unused and in its original packaging.
Return procedure for AT93C66AW-10SI-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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