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Microchip Technology AT93C66A-10TI-1.8
- Part No.:
- AT93C66A-10TI-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT93C66A-10TI-1.8.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,214
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Product details
Overview
AT93C66A-10TI-1.8 from Microchip Technology (formerly Atmel) is a 4-kbit serial EEPROM with 3-wire interface, supporting 512 × 8 or 256 × 16 organization selectable via ORG pin, 1.8V to 5.5V supply range, and automotive-grade industrial temperature operation (–40°C to +85°C) in 8-lead TSSOP package. It delivers 2 MHz clock rate at 5V, 10 ms max self-timed write cycle, and 1 million write endurance for embedded configuration storage.
For engineers reviewing the AT93C66A-10TI-1.8 datasheet, AT93C66A-10TI-1.8 pinout, AT93C66A-10TI-1.8 application, or AT93C66A-10TI-1.8 equivalent, key selection factors include low-voltage compatibility (1.8V min), user-selectable x8/x16 memory mapping, sequential read capability, READY/BUSY status reporting via DO pin, and TSSOP-8 footprint suitability for space-constrained industrial control and automotive subsystems.
Technical Context
The AT93C66A-10TI-1.8 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. Memory organization is dynamically selected by ORG pin voltage - tied to VCC for 256 × 16 mode or GND for 512 × 8 mode - enabling flexible byte- or word-oriented access without hardware redesign.
It features self-timed internal write/erase cycles with no external timing components required, READY/BUSY status output on DO during active programming, and dual-voltage qualification (1.8V–5.5V) ensuring interoperability with modern ultra-low-power microcontrollers and legacy 3.3V/5V systems while maintaining 100-year data retention and 1M write-cycle endurance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16 configurable) |
| Supply Voltage Range | 1.8V to 5.5V - supports direct interface with 1.8V I/O domains and mixed-voltage system partitioning |
| Max Clock Frequency | 2 MHz at VCC = 5V - enables fast configuration loading in boot-time-critical applications |
| Write Cycle Time | 10 ms maximum - defines worst-case latency for nonvolatile parameter updates |
| Endurance | 1 million write cycles - ensures long-term reliability in field-updatable calibration or logging use cases |
| Data Retention | 100 years at +25°C - guarantees persistent storage across product lifetime without refresh |
| Operating Temperature | –40°C to +85°C - qualified for industrial and automotive under-hood environments |
Pinout & Package
AT93C66A-10TI-1.8 is housed in an 8-lead Thin Shrink Small Outline Package (TSSOP), 0.170" wide, with standard JEDEC-compliant pinout and 0.65 mm lead pitch. The package supports reflow soldering and provides mechanical robustness for automated assembly in high-reliability applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable for serial communication - must be held low during instruction/data transfer and pulsed high to sample READY/BUSY status |
| SK | Serial Clock | Synchronous edge-triggered clock input - rising edge latches DI, falling edge outputs DO; controls all timing windows per AC specs |
| DI | Data Input | Serial command/address/data input - accepts 9-bit READ/WRITE instructions and 8-/16-bit payload with strict setup/hold timing requirements |
| DO | Data Output | Tri-state serial output - delivers read data, dummy bit, or READY ('1') / BUSY ('0') status depending on CS timing and instruction state |
| VCC | Power Supply | Primary power rail - supplies core logic and EEPROM array; decoupling capacitor required per DC characteristics |
| GND | Ground | Reference return path - must be low-impedance and shared with host controller ground to minimize noise-induced read errors |
| ORG | Organization Select | Hardware-configurable memory mapping - VCC = 256×16 mode, GND = 512×8 mode; unconnected defaults to x16 but not supported on 1.8V variants |
| DC | Don't Connect | No internal connection - must remain floating or tied to GND/VCC only if required by board layout; no electrical function |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configured 512 × 8 or 256 × 16 layout eliminates firmware overhead for byte vs. word addressing schemes |
| Self-timed write/erase cycles | Internal timing engine removes need for external delay loops or watchdog coordination during nonvolatile updates |
| READY/BUSY status reporting | Real-time DO pin feedback enables deterministic polling without fixed timeout delays or interrupt dependency |
| Low-voltage operation down to 1.8V | Direct interface with 1.8V microcontroller I/O banks avoids level-shifting circuitry and associated BOM cost |
| Automotive-grade temperature range | Qualified for –40°C to +85°C operation - suitable for engine control modules, body electronics, and ADAS sensor nodes |
Applications
| Industrial PLC Configuration Storage | Automotive ECU Parameter Calibration |
|---|---|
Use Scenario: Storing I/O mapping tables, PID tuning coefficients, and fault history logs in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile configuration register providing persistent settings across power cycles with guaranteed 100-year retention. Use Value: Enables field-upgradable logic behavior without hardware modification; 1M write cycles support frequent recalibration during commissioning and maintenance. | Use Scenario: Holding trim values, sensor offset corrections, and adaptive learning parameters in engine control units operating under thermal stress. IC Role / Device Role / Timing Role: Automotive-grade serial EEPROM interfacing directly with MCU SPI-compatible GPIO pins using 3-wire protocol. Use Value: 1.8V–5.5V operation allows seamless integration with 1.8V CAN transceivers and 3.3V microcontrollers; TSSOP-8 footprint fits tight ECU PCB layouts. |
| Medical Device Safety Settings | Smart Energy Meter Firmware Keys |
Use Scenario: Securing critical safety thresholds (e.g., dose limits, alarm triggers) in portable diagnostic equipment requiring regulatory traceability. IC Role / Device Role / Timing Role: Tamper-resistant configuration store accessed only during authorized service mode via authenticated host commands. Use Value: High reliability (1M cycles, 100-yr retention) meets IEC 62304 Class C software requirements; no external erase step simplifies secure update protocols. | Use Scenario: Storing cryptographic keys and tariff tables in utility-grade smart meters exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Low-power serial EEPROM retaining billing data and encryption material during mains dropout events. Use Value: 0.1 µA standby current at 1.8V extends backup battery life; extended temperature rating ensures accuracy across –25°C to +70°C outdoor deployments. |
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, 5V-only supply (4.5–5.5V), no ORG pin, 20 MHz clock | Higher density and speed but incompatible voltage range and interface protocol | Select when migrating to SPI-based systems with 5V infrastructure and >4 kbit capacity needs |
| STK12C68-55I | NVSRAM with parallel interface, 5V supply, 8K × 8 organization, built-in lithium backup | Byte-level random access and instant-write capability, but larger footprint and higher power | Prefer for applications requiring zero-write-latency configuration storage with battery-backed volatility |
Compared with M95M04-DRMN6TP/K and STK12C68-55I, the AT93C66A-10TI-1.8 offers unique 1.8V compatibility, hardware-selectable memory width, and minimal 3-wire interface - making it optimal for resource-constrained, mixed-voltage embedded designs where pin count and voltage flexibility outweigh raw speed or density.
Availability
AT93C66A-10TI-1.8 is available at Aetrix Electronics and suitable for industrial PLCs, automotive ECUs, medical diagnostics, and smart metering applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AT93C66A-10TI-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 belongs to Microchip's legacy serial EEPROM product line, designed specifically for reliable, low-pin-count configuration storage in cost-sensitive and space-constrained industrial and automotive systems.
FAQ
What is the memory organization of AT93C66A-10TI-1.8 and how is it configured?
The AT93C66A-10TI-1.8 provides 4096 bits organized as either 512 × 8 or 256 × 16, selected by the ORG pin: tied to VCC for 256 × 16 mode, GND for 512 × 8 mode. This hardware-selectable configuration eliminates firmware address translation and supports both byte- and word-oriented host interfaces. Note that ORG functionality is not available on 1.8V devices per datasheet specification.
Does AT93C66A-10TI-1.8 support true 1.8V operation across all specifications?
Yes, AT93C66A-10TI-1.8 is fully specified for 1.8V to 5.5V operation, including DC parameters (ISB1 = 0.1 µA max at 1.8V), AC timing (tSKH/tSKL = 1000 ns max at 1.8V), and functional operation across the full industrial temperature range (–40°C to +85°C). All performance metrics in the datasheet apply to the 1.8V variant unless explicitly noted otherwise.
How does the READY/BUSY status reporting work on AT93C66A-10TI-1.8?
During a write or erase cycle, the AT93C66A-10TI-1.8 outputs READY (logic '1') or BUSY (logic '0') on the DO pin when CS is brought high after being held low for ≥250 ns (tCS). This allows the host to poll status synchronously without fixed delays. The feature requires precise CS timing relative to SK and is valid only during active programming - not after tWP completion.
What packages are compatible with AT93C66A-10TI-1.8 and is pinout identical across variants?
AT93C66A-10TI-1.8 is specifically packaged in 8-lead TSSOP (8A2). While the AT93C66A family shares identical pin functions across PDIP, SOIC, MAP, dBGA2, and TSSOP packages, the physical pinout differs - notably, TSSOP places VCC at Pin 5 and GND at Pin 8, whereas SOIC swaps these positions. Always verify mechanical drawings before PCB layout.
Can AT93C66A-10TI-1.8 be used in automotive under-hood applications?
The AT93C66A-10TI-1.8 is rated for industrial temperature (–40°C to +85°C) and carries automotive-grade qualification per its "Automotive Grade, Extended Temperature and Lead-free/Halogen-free Devices Available" designation. However, it is not AEC-Q100 qualified. For under-hood use above +85°C, consider the AT93C66A-10SE-2.7 variant rated to +125°C or consult Microchip's automotive-specific EEPROM portfolio.
AT93C66A-10TI-1.8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm 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:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
AT93C66A-10TI-1.8 FAQ
1.How can I place an order for AT93C66A-10TI-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66A-10TI-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-10TI-1.8 reliable?
The price and inventory of AT93C66A-10TI-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-10TI-1.8 is usually 5 days.
3.What payment methods are accepted for AT93C66A-10TI-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66A-10TI-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66A-10TI-1.8?
AT93C66A-10TI-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66A-10TI-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-10TI-1.8?
For technical support, including AT93C66A-10TI-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66A-10TI-1.8 requirements.
6.How does Aetrix verify that AT93C66A-10TI-1.8 is sourced from the original manufacturer or authorized distributors?
All AT93C66A-10TI-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-10TI-1.8 meets industry standards.
7.What is the process for return or replacement of AT93C66A-10TI-1.8?
All AT93C66A-10TI-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66A-10TI-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-10TI-1.8 part is unused and in its original packaging.
Return procedure for AT93C66A-10TI-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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