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Microchip Technology AT93C66W-10SI-1.8
- Part No.:
- AT93C66W-10SI-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT93C66W-10SI-1.8.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,003
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Product details
Overview
AT93C66W-10SI-1.8 from Microchip Technology (formerly Atmel) is a 4-kbit serial EEPROM with three-wire interface, 1.8V to 5.5V supply operation, user-selectable 512 × 8 or 256 × 16 organization via ORG pin, and automotive-grade reliability. It delivers 1 million write cycles and 100-year data retention for nonvolatile configuration storage in embedded control modules.
For engineers reviewing the AT93C66W-10SI-1.8 datasheet, AT93C66W-10SI-1.8 pinout, AT93C66W-10SI-1.8 application, or AT93C66W-10SI-1.8 equivalent, key selection criteria include low-voltage compatibility (1.8V min), self-timed 10 ms write cycle, standby current ≤0.1 µA at 1.8V, and support for industrial temperature range (−40°C to +85°C).
Technical Context
The AT93C66W-10SI-1.8 implements a synchronous three-wire serial interface (CS/SK/DI/DO) with start-bit–driven instruction decoding. It supports seven instructions-READ, EWEN, ERASE, WRITE, ERAL, WRAL, and EWDS-with address lengths of 9 bits (x8) or 8 bits (x16), and includes internal logic to enforce Erase/Write Enable state before programming.
Its dual-voltage capability enables operation across 1.8V–5.5V without external level shifting. The ORG pin selects memory organization, while DC pin must be left unconnected. Ready/Busy status is reported on DO during CS high after write/erase initiation, enabling host polling without fixed timing delays.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16), enabling compact storage of calibration data or device IDs |
| Supply Voltage Range | 1.8V to 5.5V - supports direct interfacing with 1.8V logic and legacy 3.3V/5V systems |
| Write Cycle Time | Max 10 ms - self-timed; no external delay required, simplifies firmware timing control |
| Endurance | 1 million write cycles - suitable for frequent field updates such as sensor offset correction |
| Data Retention | 100 years at 25°C - ensures long-term validity of stored configuration across product lifetime |
| Standby Current | ≤0.1 µA at VCC = 1.8V - critical for battery-powered applications like smart meters or wearables |
| Operating Temperature | −40°C to +85°C - qualified for industrial and automotive under-hood environments |
Pinout & Package
AT93C66W-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; must be held low for entire instruction sequence; initiates communication on rising edge |
| SK | Serial Clock | Input clock synchronizing all data transfers; max frequency 2 MHz at 5V, 0.25 MHz at 1.8V |
| DI | Data Input | Serial instruction and address input; sampled on SK rising edge |
| DO | Data Output | Serial data output during READ; reports Ready/Busy status when CS goes high mid-cycle |
| VCC | Power Supply | 1.8V–5.5V supply; powers internal logic and EEPROM array |
| GND | Ground | Reference return path for all signals and supply |
| ORG | Organization Select | Connect to VCC for 256 × 16 mode, GND for 512 × 8 mode; not functional on 1.8V-only variants per datasheet note |
| DC | Don't Connect | No internal connection; must be left floating - tying to VCC or GND may cause undefined behavior |
Key Features
| Feature | Design Value |
|---|---|
| Three-wire serial interface | Reduces PCB routing complexity vs. SPI/I²C; requires only CS, SK, DI, DO - no bidirectional lines or pull-ups needed |
| User-selectable memory organization | Hardware-configurable 512×8 or 256×16 layout allows optimal byte- or word-aligned access without firmware remapping |
| Self-timed write cycle | Eliminates need for precise software timing loops or external wait-state generation; host polls DO for completion |
| Automotive-grade qualification | Meets extended temperature and reliability requirements for engine control units, ADAS sensors, and infotainment modules |
| Low-power standby mode | 0.1 µA max current at 1.8V enables multi-year operation from coin-cell batteries in IoT endpoint devices |
Applications
| Industrial PLC Configuration Storage | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Storing I/O mapping tables, calibration coefficients, and fault history logs in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding persistent settings that survive power loss and reset events. Use Value: Enables plug-and-play reconfiguration without firmware reflashing; 100-year retention guarantees data integrity over equipment lifetime. | Use Scenario: Saving seat position presets, mirror angles, and lighting profiles in vehicle body control units. IC Role / Device Role / Timing Role: Dedicated parameter memory accessed during power-up and user adjustment events via microcontroller GPIOs. Use Value: Supports 1M write cycles for daily user adjustments; 1.8V operation interfaces directly with 1.8V CAN transceivers and MCU I/O. |
| Smart Energy Meter Firmware Parameters | Medical Infusion Pump Calibration Data |
Use Scenario: Holding tariff schedules, metering constants, and tamper-detection flags in ANSI C12.20-compliant electricity meters. IC Role / Device Role / Timing Role: Secure, low-power storage element isolated from main processor bus; accessed only during initialization or update windows. Use Value: 0.1 µA standby current extends battery backup life beyond 10 years; AEC-Q200–compatible construction ensures field reliability. | Use Scenario: Storing flow-rate calibration curves, motor step compensation values, and safety-critical limits in Class II medical infusion pumps. IC Role / Device Role / Timing Role: Fail-safe configuration memory with deterministic write completion reporting via DO pin polling. Use Value: Self-timed 10 ms writes prevent timing-related race conditions; 100-year retention satisfies FDA 21 CFR Part 11 long-term recordkeeping mandates. |
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 | Successor device with enhanced ESD robustness (4 kV HBM), updated AC specs, and recommended for new designs per datasheet notice | Same pinout and instruction set; supports identical voltage and temperature ranges | Select for new designs requiring latest qualification and improved manufacturing yield |
| M95M04-DRMN6TP/K | 4-Mbit SPI EEPROM (vs. 4-kbit); 1.8V–5.5V; 5 MHz clock; WLCSP package; no ORG pin | Higher density but different interface protocol; lacks hardware organization select; requires SPI driver stack | Choose only if higher capacity and SPI infrastructure already exist; not drop-in compatible |
Compared with AT93C66W-10SI-1.8, the AT93C66A-10SI-1.8 offers identical functionality with improved process reliability, while the M95M04-DRMN6TP/K provides greater density at the cost of interface incompatibility and loss of hardware-configurable organization.
Availability
AT93C66W-10SI-1.8 is available at Aetrix Electronics and suitable for industrial control, automotive electronics, smart metering, and medical device applications requiring stable component supply and long-term lifecycle support.
Supply support for AT93C66W-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 memory solutions, with a focus on embedded control and connectivity.
The AT93C66W-10SI-1.8 belongs to Microchip's legacy serial EEPROM product line, designed for cost-sensitive, low-pin-count applications where simplicity, low voltage operation, and long-term data retention are essential.
FAQ
What is the maximum clock frequency supported by AT93C66W-10SI-1.8 at 1.8V?
The AT93C66W-10SI-1.8 supports a maximum SK clock frequency of 0.25 MHz when operating at 1.8V, as specified in Table 4 of the datasheet. This limit ensures reliable setup/hold timing margins for DI and DO signals under low-voltage conditions. Higher frequencies up to 2 MHz are permitted only at VCC ≥ 4.5V.
Can the ORG pin be left unconnected on AT93C66W-10SI-1.8?
No - the ORG pin must be actively tied to either VCC or GND to select 256 × 16 or 512 × 8 organization. Per the datasheet, the internal 1 MΩ pull-up is not guaranteed on 1.8V devices, so leaving ORG floating results in undefined behavior. AT93C66W-10SI-1.8 requires explicit hardware configuration.
Is AT93C66W-10SI-1.8 pin-compatible with AT93C66A-10SI-1.8?
Yes - AT93C66W-10SI-1.8 and AT93C66A-10SI-1.8 share identical 8-lead SOIC (8S1) packaging, pin assignments, electrical characteristics, and instruction set. The AT93C66A-10SI-1.8 is a direct replacement with enhanced ESD rating and updated process, explicitly recommended for new designs in the datasheet.
Does AT93C66W-10SI-1.8 require a separate erase cycle before writing?
No - the AT93C66W-10SI-1.8 performs automatic erase-before-write within its self-timed 10 ms write cycle. No explicit ERASE instruction is needed prior to WRITE; the device internally erases the target location before programming new data, simplifying firmware implementation.
What is the meaning of the "W" in AT93C66W-10SI-1.8?
The "W" in AT93C66W-10SI-1.8 denotes EIAJ SOIC packaging (8S2), per the Ordering Information table on page 13. However, the full part number AT93C66W-10SI-1.8 uses "SI", indicating JEDEC SOIC (8S1). This reflects a documented variant designation where "W" appears in the base ordering code but the suffix "SI" overrides it to specify the JEDEC-compliant 8-lead SOIC package actually shipped.
AT93C66W-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
AT93C66W-10SI-1.8 FAQ
1.How can I place an order for AT93C66W-10SI-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66W-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 AT93C66W-10SI-1.8 reliable?
The price and inventory of AT93C66W-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 AT93C66W-10SI-1.8 is usually 5 days.
3.What payment methods are accepted for AT93C66W-10SI-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66W-10SI-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66W-10SI-1.8?
AT93C66W-10SI-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66W-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 AT93C66W-10SI-1.8?
For technical support, including AT93C66W-10SI-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66W-10SI-1.8 requirements.
6.How does Aetrix verify that AT93C66W-10SI-1.8 is sourced from the original manufacturer or authorized distributors?
All AT93C66W-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 AT93C66W-10SI-1.8 meets industry standards.
7.What is the process for return or replacement of AT93C66W-10SI-1.8?
All AT93C66W-10SI-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66W-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 AT93C66W-10SI-1.8 part is unused and in its original packaging.
Return procedure for AT93C66W-10SI-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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