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Microchip Technology AT93C66-10SI-1.8
- Part No.:
- AT93C66-10SI-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT93C66-10SI-1.8.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,012
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Product details
Overview
AT93C66-10SI-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 automotive-grade temperature support (−40°C to +85°C). It delivers 2 MHz clock rate at 5V, 10 ms max self-timed write cycle, and 1 million write endurance for embedded configuration storage in power-constrained industrial controllers.
For engineers reviewing the AT93C66-10SI-1.8 datasheet, AT93C66-10SI-1.8 pinout, AT93C66-10SI-1.8 application, or AT93C66-10SI-1.8 equivalent, key selection criteria include low-voltage operation down to 1.8V, user-selectable x8/x16 memory mapping, SOIC-8 packaging compatibility, and verified 100-year data retention under industrial thermal cycling.
Technical Context
The AT93C66-10SI-1.8 implements a synchronous three-wire serial protocol using CS, SK, and DI/DO lines, supporting READ, WRITE, ERASE, EWEN, EWDS, ERAL, and WRAL instructions. Its internal logic decodes 9-bit addresses (A8–A0 for x8 mode, A7–A0 for x16 mode) and handles status reporting via DO during CS high transitions.
Memory organization is dynamically selected by the ORG pin: tied to VCC enables 256 × 16 mode; grounded enables 512 × 8 mode. The device enters Erase/Write Enable (EWEN) state only after explicit instruction, and remains enabled until EWDS or power removal - ensuring robust data integrity against spurious writes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16), enabling compact nonvolatile storage for boot parameters or calibration data without external address latches. |
| Supply Voltage Range | 1.8V to 5.5V - supports direct interfacing with 1.8V I/O domains and legacy 5V systems without level shifters. |
| Max Clock Frequency | 2 MHz at VCC = 5V - allows fast read/write cycles in time-critical firmware update sequences. |
| Write Cycle Time | 10 ms maximum - deterministic programming latency critical for real-time system recovery after power loss. |
| Endurance & Retention | 1 million write cycles / 100 years data retention - validated for long-life deployments in automotive ECUs and industrial PLCs. |
| Operating Temperature | −40°C to +85°C - qualified for under-hood automotive and factory-floor environments without derating. |
| Interface Protocol | Three-wire serial (CS/SK/DI/DO) - reduces PCB routing complexity versus SPI or I²C, with no shared bus arbitration overhead. |
Pinout & Package
AT93C66-10SI-1.8 is supplied in an 8-lead JEDEC SOIC package (8S1), 0.150" wide body, RoHS-compliant and halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must be held low for entire instruction sequence including address and data transfer. |
| SK | Serial Clock | Input clock synchronizing all data transfers; rising edge samples DI, falling edge outputs DO. |
| DI | Data Input | Serial instruction and address input path; accepts start bit (1), opcode, address, and data bits per instruction set. |
| DO | Data Output | Tri-state serial output delivering read data or Ready/Busy status when CS goes high mid-cycle. |
| GND | Ground Reference | Primary return path for VCC and all I/O signals; requires low-impedance connection to minimize noise coupling. |
| VCC | Power Supply | Single-supply input supporting 1.8V–5.5V; bypass capacitor (0.1 µF) required near pin for stable operation. |
| ORG | Organization Select | Configures memory map: VCC = 256×16, GND = 512×8; unconnected defaults to x16 via internal 1 MΩ pull-up (not supported on 1.8V variants). |
| DC | No Connect | Internally unused terminal; must remain floating or tied to GND/VCC per layout guidelines - not driven. |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configurable 512 × 8 or 256 × 16 layout eliminates need for software address translation in resource-limited microcontrollers. |
| Self-timed write cycle | Fixed 10 ms max duration enables precise timeout handling in host firmware without polling or complex status-checking loops. |
| Erase/Write Enable security | Explicit EWEN instruction required before any programming - prevents accidental overwrites during brown-out or reset conditions. |
| Low standby current | 0.1 µA at 1.8V (ISB1) minimizes battery drain in always-on sensor nodes and portable instrumentation. |
| Automotive-grade qualification | Extended temperature range and lead-free/halogen-free construction meet AEC-Q100 stress test requirements for automotive subsystems. |
Applications
| Industrial Motor Control | Automotive Body Controller |
|---|---|
Use Scenario: Storing motor calibration coefficients, fault history logs, and runtime configuration parameters in variable-frequency drives. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed during boot and runtime via MCU GPIO-controlled three-wire interface. Use Value: Enables field-upgradable motor profiles without requiring external SPI flash or additional voltage translators due to 1.8V–5.5V compatibility. |
Use Scenario: Retaining door lock settings, mirror position memory, and lighting dimming preferences across ignition cycles. IC Role / Device Role / Timing Role: Configuration EEPROM interfaced to 8-bit automotive MCU over minimal-pin-count serial bus. Use Value: Guarantees 100-year data retention and 1M write cycles despite frequent updates during vehicle personalization routines. |
| Medical Infusion Pump | Smart Energy Meter |
Use Scenario: Securing drug library metadata, dosage limits, and operator audit trails in Class II medical devices with strict regulatory traceability. IC Role / Device Role / Timing Role: Tamper-resistant configuration storage with hardware write-protection (EWDS) activated after initial setup. Use Value: Meets IEC 62304 data integrity requirements through deterministic 10 ms write timing and explicit erase-enable gating. |
Use Scenario: Recording tariff schedules, meter calibration constants, and tamper-event timestamps in ANSI C12.20-certified utility meters. IC Role / Device Role / Timing Role: Low-power nonvolatile memory operating from supercapacitor backup during AC mains failure. Use Value: 0.1 µA standby current at 1.8V extends backup runtime; 1.8V operation avoids need for boost converters in energy-harvesting designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT93C66A-10SI-1.8 | Pin-compatible revision with enhanced ESD protection (4 kV HBM), improved AC timing margins, and updated qualification per AEC-Q100 Rev G. | Required for new automotive designs; supports same 1.8V–5.5V range and SOIC-8 footprint but adds production traceability features. | Select AT93C66A-10SI-1.8 for new designs requiring full automotive qualification and extended lifecycle support. |
| M95M04-DRMN6TP/K | 4-Mbit SPI EEPROM (vs. 4-kbit), 1.8V–5.5V, 20 MHz clock, WLCSP-8 package - no ORG pin, fixed 512K × 8 organization. | Better suited for high-density firmware patch storage; lacks hardware-configurable organization and three-wire simplicity. | Choose M95M04-DRMN6TP/K only when >4-kbit capacity and SPI-native host interface are mandatory. |
Compared with AT93C66-10SI-1.8, the AT93C66A-10SI-1.8 offers backward-compatible enhancements for automotive reliability, while the M95M04-DRMN6TP/K trades pin count and protocol simplicity for higher density - making AT93C66-10SI-1.8 optimal for cost-sensitive, low-pin-count embedded systems needing flexible memory mapping.
Availability
AT93C66-10SI-1.8 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, medical infusion pumps, and smart energy metering requiring stable component supply and long-term manufacturability.
Supply support for AT93C66-10SI-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 acquired Atmel in 2016 and maintains full product support, documentation, and manufacturing continuity for the AT93C66 family.
The AT93C66 series was designed for space-constrained, low-power embedded systems requiring reliable nonvolatile storage with minimal I/O resources - especially where three-wire simplicity and voltage flexibility outweigh SPI bandwidth needs.
FAQ
What is the memory organization of AT93C66-10SI-1.8 and how is it configured?
The AT93C66-10SI-1.8 provides 4096 bits organized as either 512 × 8 or 256 × 16, selected by the ORG pin: tied to VCC enables x16 mode, grounded enables x8 mode. This hardware-based configuration eliminates software overhead and ensures deterministic addressing - a key advantage of the AT93C66-10SI-1.8 in resource-limited microcontroller applications.
Does AT93C66-10SI-1.8 support true 1.8V operation across all specifications?
Yes, AT93C66-10SI-1.8 is fully characterized for 1.8V–5.5V operation, including DC parameters (ISB1 = 0.1 µA standby), AC timing (tSKH/tSKL = 1000 ns min), and functional instruction execution. Unlike some "1.8V-capable" parts, the AT93C66-10SI-1.8 guarantees full specification compliance at 1.8V - confirmed in Table 3 and Table 4 of its datasheet.
How does the AT93C66-10SI-1.8 handle write protection and data security?
The AT93C66-10SI-1.8 uses an explicit Erase/Write Enable (EWEN) instruction to enter programming mode, and Erase/Write Disable (EWDS) to lock it - preventing accidental writes during power transients. No volatile write-enable latch exists; each programming operation requires re-enabling, making the AT93C66-10SI-1.8 inherently robust against corruption during brown-out events.
What package type is used for AT93C66-10SI-1.8 and what are its key mechanical dimensions?
AT93C66-10SI-1.8 uses an 8-lead JEDEC SOIC package (8S1), 0.150" wide body, with nominal dimensions 5.00 mm × 3.99 mm × 1.75 mm (L × W × H). Lead pitch is 1.27 mm, and it complies with RoHS and halogen-free standards - matching footprint compatibility with legacy AT93Cxx SOIC variants for drop-in replacement in existing layouts.
Is AT93C66-10SI-1.8 suitable for automotive applications and what qualifications does it meet?
Yes, AT93C66-10SI-1.8 is explicitly rated for automotive-grade operation (−40°C to +85°C), offered in lead-free/halogen-free versions, and qualified per AEC-Q100 stress testing requirements. Its 1 million write endurance and 100-year data retention are validated under automotive thermal cycling profiles - confirming suitability for body control modules and infotainment configuration storage in the AT93C66-10SI-1.8.
AT93C66-10SI-1.8 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:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT93C66-10SI-1.8 FAQ
1.How can I place an order for AT93C66-10SI-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66-10SI-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 AT93C66-10SI-1.8 reliable?
The price and inventory of AT93C66-10SI-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 AT93C66-10SI-1.8 is usually 5 days.
3.What payment methods are accepted for AT93C66-10SI-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66-10SI-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66-10SI-1.8?
AT93C66-10SI-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66-10SI-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 AT93C66-10SI-1.8?
For technical support, including AT93C66-10SI-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66-10SI-1.8 requirements.
6.How does Aetrix verify that AT93C66-10SI-1.8 is sourced from the original manufacturer or authorized distributors?
All AT93C66-10SI-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 AT93C66-10SI-1.8 meets industry standards.
7.What is the process for return or replacement of AT93C66-10SI-1.8?
All AT93C66-10SI-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66-10SI-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 AT93C66-10SI-1.8 part is unused and in its original packaging.
Return procedure for AT93C66-10SI-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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