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Microchip Technology AT93C66A-10PU-1.8
- Part No.:
- AT93C66A-10PU-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT93C66A-10PU-1.8.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 2MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,679
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Product details
Overview
AT93C66A-10PU-1.8 from Microchip Technology (formerly Atmel) is a 4-kbit serial EEPROM with three-wire interface, configurable 512×8 or 256×16 organization via ORG pin, 1.8V–5.5V supply range, and 10 ms max self-timed write cycle. It supports sequential read, automotive-grade operation, and is housed in an 8-lead PDIP package.
For engineers reviewing the AT93C66A-10PU-1.8 datasheet, AT93C66A-10PU-1.8 pinout, AT93C66A-10PU-1.8 application, or AT93C66A-10PU-1.8 equivalent, this page delivers verified electrical specs, JEDEC PDIP pin mapping, low-voltage EEPROM use cases in embedded control and sensor calibration, and two validated alternative parts with documented functional and voltage-range differences.
Technical Context
The AT93C66A-10PU-1.8 implements a synchronous three-wire serial interface (CS/SK/DI/DO) with start-bit–driven instruction decoding and internal address pointer auto-increment for sequential reads. Its ORG pin selects between x8 and x16 memory organization, and its Erase/Write Enable (EWEN) state machine enforces write protection until explicitly enabled.
It operates across industrial temperature (−40°C to +85°C), features 1 million write cycles and 100-year data retention, and uses no external erase cycle-programming is self-timed with Ready/Busy status output on DO during active write/erase operations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16 words), enabling compact nonvolatile storage for configuration registers or calibration data |
| Supply Voltage Range | 1.8 V to 5.5 V - supports direct interfacing with 1.8V logic and mixed-voltage systems without level shifters |
| Write Cycle Time | Max 10 ms - defines minimum time between successive write commands; impacts firmware polling or timeout design |
| Endurance | 1 million write cycles - ensures long-term reliability in field-updatable applications like metering or industrial settings |
| Data Retention | 100 years at 25°C - guarantees persistent storage integrity over product lifetime without refresh |
| Interface Speed | 2 MHz max clock rate at 5V - sets upper bound on serial transaction throughput for host MCU timing budget |
| Standby Current | 0.4 µA at 1.8V - enables ultra-low-power operation in battery-backed or energy-harvesting systems |
Pinout & Package
AT93C66A-10PU-1.8 is packaged in an 8-lead, 0.300" wide Plastic Dual Inline Package (PDIP), JEDEC MS-001 compliant, with 0.100" lead pitch and through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must be held low for entire instruction sequence; controls DO high-impedance state |
| SK | Serial Clock | Synchronous edge-triggered input; rising edge latches DI, falling edge clocks DO; max 2 MHz at 5V |
| DI | Data Input | Serial instruction and address/data input; accepts start bit (1), op code, address, and payload per instruction set |
| DO | Data Output | Open-drain output; provides read data, Ready/Busy status, or high-impedance when CS high |
| GND | Ground Reference | Primary return path for VCC and all I/O; requires low-impedance PCB connection for noise immunity |
| VCC | Power Supply | 1.8V–5.5V single supply; powers internal logic and EEPROM array; bypass capacitor recommended |
| ORG | Organization Select | Logic-high = 256×16 mode; logic-low = 512×8 mode; unconnected defaults to x16 via internal 1 MΩ pull-up |
| NC | No Connect | Internally unused pin; must remain floating or grounded per layout guidelines; no electrical function |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configurable 512×8 or 256×16 layout via ORG pin, eliminating need for software remapping |
| Self-timed write cycle | No external timing control required; DO outputs Ready/Busy status, simplifying host firmware wait-loop implementation |
| Low-voltage operation down to 1.8V | Enables direct integration with 1.8V microcontrollers and battery-powered devices without voltage translation |
| Three-wire serial interface | Reduces MCU pin count vs. SPI/I²C; compatible with general-purpose GPIOs and minimal external components |
| High reliability | 1M write cycles and 100-year data retention meet industrial and automotive qualification requirements |
Applications
| Industrial Sensor Calibration | Embedded System Configuration |
|---|---|
Use Scenario: Storing factory-calibrated offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter storage accessed at power-on reset; read-only during runtime; write only during calibration procedure. Use Value: Eliminates manual potentiometer adjustment; enables field recalibration via host MCU using the three-wire interface. | Use Scenario: Holding boot-time configuration flags (e.g., UART baud rate, display brightness, network MAC address) in medical diagnostic equipment. IC Role / Device Role / Timing Role: Early-boot configuration loader; accessed before main application starts; write-protected after initialization. Use Value: Enables device personalization without firmware reflash; supports regulatory-compliant traceability via stored serial numbers. |
| Smart Meter Firmware Patch Storage | Automotive Body Control Module Settings |
Use Scenario: Storing small firmware patches or security keys in utility smart meters deployed in remote locations. IC Role / Device Role / Timing Role: Secure update payload storage; write-enabled only during authenticated OTA session; read during patch application. Use Value: Provides tamper-resistant, low-power nonvolatile storage for critical updates where flash endurance is limited. | Use Scenario: Saving user preferences (seat position, mirror angle, lighting profiles) in automotive body control modules. IC Role / Device Role / Timing Role: Persistent settings register; written on change event; read at ignition-on; operates across 1.8V–5.5V battery transients. Use Value: Maintains user experience continuity across power cycles; withstands automotive voltage fluctuations without data corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT93C66B-10PU-1.8 | Successor part with identical pinout, voltage range, and memory size; improved AC timing specs and updated process node | Same use cases; preferred for new designs due to extended lifecycle support and enhanced reliability characterization | Select AT93C66B-10PU-1.8 for new designs requiring full manufacturer support and latest qualification data |
| M95640-DW DW | 64-Kbit SPI EEPROM (8K × 8); 1.8V–5.5V; 20 MHz SPI clock; different 8-pin SO8 package and 4-wire interface | Higher density and faster interface; requires SPI peripheral instead of GPIO-bitbanged three-wire; not drop-in compatible | Choose M95640-DW when higher capacity or faster serial throughput is needed and SPI hardware is available |
Compared with AT93C66A-10PU-1.8, the AT93C66B-10PU-1.8 offers identical functionality with enhanced AC performance and ongoing production support, while the M95640-DW provides greater density and speed but demands SPI hardware and board-level redesign.
Availability
AT93C66A-10PU-1.8 is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, and automotive body control module settings requiring stable component supply and long-term obsolescence management.
Supply support for AT93C66A-10PU-1.8 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 nonvolatile memory solutions, with a focus on embedded control and connectivity.
The AT93C66A-10PU-1.8 belongs to Microchip's legacy serial EEPROM product line, designed for cost-sensitive, low-pin-count applications requiring reliable, low-voltage nonvolatile storage in industrial and automotive environments.
FAQ
What is the maximum clock frequency supported by AT93C66A-10PU-1.8?
The AT93C66A-10PU-1.8 supports up to 2 MHz SK clock frequency at VCC = 5.0 V. At lower voltages (1.8V–2.7V), the maximum clock rate drops to 0.25 MHz per AC characteristics table. This directly affects serial transaction duration and host MCU timing margins.
How does the ORG pin affect memory organization in AT93C66A-10PU-1.8?
In AT93C66A-10PU-1.8, connecting ORG to VCC selects 256 × 16 organization (16-bit words), while grounding ORG selects 512 × 8 (8-bit words). If left unconnected, the internal 1 MΩ pull-up defaults to x16 mode. This hardware selection avoids firmware overhead for address translation.
Is AT93C66A-10PU-1.8 suitable for automotive applications?
Yes - AT93C66A-10PU-1.8 is qualified for automotive use per its datasheet, supporting −40°C to +85°C operation and meeting reliability requirements including 1 million write cycles and 100-year data retention. However, it is not AEC-Q100 certified; consult Microchip for qualified automotive variants.
What is the standby current consumption of AT93C66A-10PU-1.8 at 1.8V?
At VCC = 1.8 V and CS = 0 V, the AT93C66A-10PU-1.8 draws a typical standby current of 0.4 µA, with a maximum of 1.0 µA. This ultra-low quiescent draw makes it suitable for battery-operated systems where power budget is constrained.
Does AT93C66A-10PU-1.8 require an external erase cycle before writing?
No - AT93C66A-10PU-1.8 performs self-timed erase-and-write operations internally. The WRITE instruction automatically erases the target location before programming; no separate ERASE command is needed unless selective erasure is required. The EWEN instruction must precede any write operation.
AT93C66A-10PU-1.8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT93C66A-10PU-1.8 FAQ
1.How can I place an order for AT93C66A-10PU-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66A-10PU-1.8 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-10PU-1.8 reliable?
The price and inventory of AT93C66A-10PU-1.8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT93C66A-10PU-1.8 is usually 5 days.
3.What payment methods are accepted for AT93C66A-10PU-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66A-10PU-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66A-10PU-1.8?
AT93C66A-10PU-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66A-10PU-1.8 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-10PU-1.8?
For technical support, including AT93C66A-10PU-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66A-10PU-1.8 requirements.
6.How does Aetrix verify that AT93C66A-10PU-1.8 is sourced from the original manufacturer or authorized distributors?
All AT93C66A-10PU-1.8 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-10PU-1.8 meets industry standards.
7.What is the process for return or replacement of AT93C66A-10PU-1.8?
All AT93C66A-10PU-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66A-10PU-1.8, 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-10PU-1.8 part is unused and in its original packaging.
Return procedure for AT93C66A-10PU-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT93C66A-10PU-1.8 Tags
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