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Microchip Technology AT93C66A-10SI-1.8
- Part No.:
- AT93C66A-10SI-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT93C66A-10SI-1.8.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,691
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Product details
Overview
AT93C66A-10SI-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, and automotive-grade industrial temperature range (−40°C to +85°C). It delivers 2 MHz clock rate at 5V, 10 ms max self-timed write cycle, and is used in embedded system configuration storage where low-voltage operation and long-term data retention are critical.
For engineers reviewing the AT93C66A-10SI-1.8 datasheet, AT93C66A-10SI-1.8 pinout, AT93C66A-10SI-1.8 application, or AT93C66A-10SI-1.8 equivalent, key selection considerations include voltage compatibility (1.8V–5.5V), x8/x16 organization flexibility, sequential read capability, READY/BUSY status reporting via DO, and TSSOP-8 package footprint for space-constrained PCBs.
Technical Context
The AT93C66A-10SI-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. Its internal logic decodes 7-bit opcodes and 9-bit (x8) or 8-bit (x16) addresses, with dummy-bit-prefixed output during READ and automatic address incrementation for sequential reads.
Operation requires explicit Erase/Write Enable (EWEN) before programming; all write cycles are self-timed with DO indicating READY/BUSY status when CS is asserted post-initiation. The ORG pin selects memory width (VCC = x16, GND = x8), but this feature is disabled on 1.8V variants per datasheet note - confirming AT93C66A-10SI-1.8 defaults to fixed x8 organization only.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 organization; x16 not enabled on 1.8V variant) |
| Supply Voltage Range | 1.8V to 5.5V - enables direct interfacing with 1.8V logic and mixed-voltage systems without level shifters |
| Max Clock Frequency | 2 MHz at VCC = 5V - sets upper bound for serial data throughput in configuration loading |
| Write Cycle Time | 10 ms maximum - defines worst-case latency for nonvolatile parameter updates |
| Endurance | 1 million write cycles - supports frequent field calibration or logging in industrial controllers |
| Data Retention | 100 years at 25°C - ensures firmware identifiers or calibration constants remain valid over product lifetime |
| Operating Temperature | −40°C to +85°C - qualified for industrial and automotive under-hood applications |
Pinout & Package
AT93C66A-10SI-1.8 is supplied in an 8-lead JEDEC SOIC (8S1) package, 0.150" wide, with gull-wing leads and standard 1.27 mm pitch. Pin 1 is marked by a beveled corner or notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable: device responds only when CS is low; high state places DO in high-impedance mode |
| SK | Serial Clock | Synchronizes all data transfers; rising edge samples DI, falling edge outputs DO |
| DI | Data Input | Receives instruction opcodes, addresses, and write data; latched on SK rising edge |
| DO | Data Output | Outputs read data or READY/BUSY status; tri-stated when CS is high |
| VCC | Power Supply | 1.8V–5.5V supply input; must be stable during write cycles to prevent corruption |
| GND | Ground | Reference return path for all I/O and internal circuitry |
| ORG | Organization Select | Fixed to x8 mode on 1.8V devices; no functional effect - must be tied to VCC or GND per layout guidelines |
| DC | Don't Connect | No internal connection; must remain unconnected and unstubbed to avoid noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Functional down to 1.8V supply - eliminates need for dedicated 2.7V regulators in battery-powered IoT nodes |
| Self-timed write cycle | No external timing control required - simplifies host firmware by removing wait-state management |
| READY/BUSY status reporting | DO pin signals completion via logic level during CS high - enables polling-based write confirmation without fixed delays |
| Sequential read mode | Continuous data stream across multiple addresses with single CS assertion - reduces SPI transaction overhead in boot-loader configuration reads |
| Automotive-grade qualification | Qualified to extended temperature and reliability standards - suitable for engine control modules and ADAS sensor calibration storage |
Applications
| Industrial PLC Configuration Storage | Automotive Sensor Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping tables, PID tuning parameters, and alarm thresholds in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile configuration register providing persistent settings across power cycles; accessed during startup and runtime reconfiguration. Use Value: Enables field-upgradable control logic without hardware changes; 100-year data retention ensures parameter integrity over multi-decade equipment lifespans. | Use Scenario: Holding temperature-compensated offset/gain coefficients for wheel speed sensors and pressure transducers in engine management systems. IC Role / Device Role / Timing Role: Calibration data repository read once at power-on and applied to analog front-end signal conditioning paths. Use Value: Maintains measurement accuracy across −40°C to +125°C ambient extremes; 1M endurance supports recalibration during service intervals. |
| Medical Device Setup Profiles | Consumer Appliance User Preferences |
Use Scenario: Saving clinician-defined therapy parameters (e.g., infusion rates, alarm limits) in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage for regulatory-compliant device configuration; accessed via microcontroller's GPIO-driven bit-banged interface. Use Value: Meets IEC 62304 data integrity requirements; 1.8V operation allows direct connection to ultra-low-power ARM Cortex-M0+ MCUs. | Use Scenario: Retaining user-selected modes (e.g., spin speed, temperature, delay start) in washing machines and HVAC controllers after AC power loss. IC Role / Device Role / Timing Role: Persistent preference store updated infrequently during UI interaction; read at boot to restore last-known state. Use Value: Eliminates capacitor-backed SRAM; 10 ms write time ensures responsive UI feedback without perceptible lag. |
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 EEPROM, 2.5–5.5V supply, 20 MHz SPI clock, WLCSP-8 package | Higher density and faster interface; lacks ORG pin flexibility and 1.8V support | Choose for high-throughput logging where 1.8V operation is unnecessary and SPI-native hosts exist |
| BR24G64FJ-3GE2 | 64 Kbit I²C EEPROM, 1.7–5.5V, 1 MHz bus speed, SOP-8 package | I²C interface instead of 3-wire; no READY/BUSY pin; lower write endurance (400k cycles) | Prefer when system already uses I²C peripherals and board space permits larger SOP-8 footprint |
Compared with M95M04-DRMN6TP/K and BR24G64FJ-3GE2, the AT93C66A-10SI-1.8 offers unique 1.8V compatibility, deterministic READY/BUSY signaling, and minimal pin count - making it optimal for resource-constrained 3-wire designs requiring guaranteed low-voltage operation and robust status feedback.
Availability
AT93C66A-10SI-1.8 is available at Aetrix Electronics and suitable for industrial PLC configuration storage, automotive sensor calibration data, and medical device setup profiles requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT93C66A-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 is a global semiconductor company specializing in microcontrollers, analog devices, and nonvolatile memory solutions, with emphasis on reliability and long-term product support.
The AT93C66A belongs to Microchip's legacy serial EEPROM family designed for cost-sensitive, low-pin-count embedded systems requiring simple, robust, and voltage-flexible nonvolatile storage - particularly in automotive, industrial, and medical applications.
FAQ
What is the memory organization of AT93C66A-10SI-1.8?
The AT93C66A-10SI-1.8 is configured as 512 × 8 (4096 bits total). Although the AT93C66A family supports x16 organization via the ORG pin, this feature is explicitly disabled on 1.8V variants per the datasheet - meaning AT93C66A-10SI-1.8 operates exclusively in x8 mode regardless of ORG pin state. This simplifies design by eliminating configuration dependency.
Does AT93C66A-10SI-1.8 support true 1.8V operation across all specifications?
Yes, AT93C66A-10SI-1.8 is fully specified for 1.8V to 5.5V operation, including DC characteristics (ISB1 = 0.1 µA max standby current at 1.8V), AC timing (tSKH/tSKL = 1000 ns max at 1.8V), and functionality (READ, WRITE, EWEN). All parameters in the 1.8V row of the DC and AC tables apply directly to AT93C66A-10SI-1.8 without derating.
How is READY/BUSY status reported on AT93C66A-10SI-1.8?
AT93C66A-10SI-1.8 reports READY/BUSY status on the DO pin: after initiating a WRITE or ERASE cycle, assert CS high for ≥250 ns (tCS), then sample DO - logic '1' indicates completion, logic '0' indicates ongoing operation. This mechanism is fully functional at 1.8V and requires no additional control lines, enabling simple polling-based firmware implementation for AT93C66A-10SI-1.8.
What package type is used for AT93C66A-10SI-1.8?
AT93C66A-10SI-1.8 uses the 8-lead JEDEC SOIC (8S1) package: 0.150" body width, gull-wing leads, 1.27 mm pitch, and standard SOIC land pattern. This package is RoHS-compliant, halogen-free, and compatible with automated SMT assembly processes - identical to industry-standard 8-pin SOIC footprints used for numerous other serial EEPROMs and logic devices.
Can AT93C66A-10SI-1.8 be used in automotive under-hood applications?
AT93C66A-10SI-1.8 is rated for −40°C to +85°C operation and qualified as automotive grade per the datasheet, but it is not specified for extended temperature (−40°C to +125°C) operation. For under-hood use where ambient exceeds 85°C, Microchip's AT93C66A-10SE-2.7 (extended temp) or equivalent AEC-Q100 qualified variants should be selected instead of AT93C66A-10SI-1.8.
AT93C66A-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
AT93C66A-10SI-1.8 FAQ
1.How can I place an order for AT93C66A-10SI-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66A-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 AT93C66A-10SI-1.8 reliable?
The price and inventory of AT93C66A-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 AT93C66A-10SI-1.8 is usually 5 days.
3.What payment methods are accepted for AT93C66A-10SI-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66A-10SI-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66A-10SI-1.8?
AT93C66A-10SI-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66A-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 AT93C66A-10SI-1.8?
For technical support, including AT93C66A-10SI-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66A-10SI-1.8 requirements.
6.How does Aetrix verify that AT93C66A-10SI-1.8 is sourced from the original manufacturer or authorized distributors?
All AT93C66A-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 AT93C66A-10SI-1.8 meets industry standards.
7.What is the process for return or replacement of AT93C66A-10SI-1.8?
All AT93C66A-10SI-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66A-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 AT93C66A-10SI-1.8 part is unused and in its original packaging.
Return procedure for AT93C66A-10SI-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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