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Microchip Technology AT93C66W-10SI-2.7
- Part No.:
- AT93C66W-10SI-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT93C66W-10SI-2.7.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,592
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Product details
Overview
AT93C66W-10SI-2.7 from Microchip Technology (formerly Atmel) is a 4-kbit serial EEPROM with three-wire interface, user-selectable 512 × 8 or 256 × 16 organization via ORG pin, 2.7V to 5.5V supply operation, and automotive-grade temperature range (−40°C to +85°C). It delivers 1 million write cycles and 100-year data retention in an 8-lead EIAJ SOIC package, used for configuration storage in industrial control modules.
For engineers reviewing the AT93C66W-10SI-2.7 datasheet, AT93C66W-10SI-2.7 pinout, AT93C66W-10SI-2.7 application, or AT93C66W-10SI-2.7 equivalent, this page provides verified electrical specs, validated pin functions, confirmed packaging details, and real-world use cases - all extracted from the official Microchip AT93C46/56/66 datasheet Rev. 0172Y.
Technical Context
The AT93C66W-10SI-2.7 implements a synchronous three-wire serial interface (CS, SK, DI/DO) with start-bit–driven instruction decoding. Its internal organization is dynamically selected by the ORG pin state: VCC selects 256 × 16 mode; GND selects 512 × 8 mode. The device supports full-array erase/write (ERAL/WRAL) only at 4.5V–5.5V, and requires EWEN before any programming sequence.
It features self-timed write cycles (max 10 ms), Ready/Busy status reporting via DO during CS high, and dual-voltage support (2.7V–5.5V). Standby current is 6.0–10.0 µA at 2.7V, and AC timing parameters scale with VCC: fSK = 2 MHz at 5V, 1 MHz at 2.7V, and 0.25 MHz at 1.8V - though AT93C66W-10SI-2.7 is specifically the 2.7V-rated variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16 words), enabling compact nonvolatile storage for calibration tables or device IDs |
| Supply Voltage Range | 2.7V to 5.5V - compatible with 3.3V and 5V logic systems without level shifting |
| Write Endurance | 1 million cycles - supports frequent field updates in programmable logic controllers |
| Data Retention | 100 years at 25°C - ensures long-term reliability in unattended infrastructure equipment |
| Max Clock Frequency | 2 MHz at VCC = 5V - enables fast configuration reads during system boot |
| Operating Temperature | −40°C to +85°C - qualified for industrial and automotive under-hood applications |
| Interface Protocol | Three-wire serial (CS/SK/DI/DO) - reduces PCB routing complexity vs. SPI or I²C |
Pinout & Package
AT93C66W-10SI-2.7 is housed in an 8-lead EIAJ SOIC package (package code 8S2), 0.209" body width, gull-wing leads, RoHS-compliant and halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must be held low for entire instruction cycle; determines command validity window |
| SK | Serial Clock | Synchronizes all data transfers; rising edge latches DI, falling edge outputs DO |
| DI | Data Input | Receives start bit, opcode, address, and write data; high-impedance when not selected |
| DO | Data Output | Drives read data or Ready/Busy status; high-impedance when CS is high or during write |
| GND | Ground Reference | Signal and power return path; must be low-impedance to minimize noise on SK/DI/DO |
| VCC | Power Supply | 2.7V–5.5V input; decoupling capacitor (0.1 µF) required within 10 mm of pin |
| ORG | Organization Select | Connect to VCC for 256 × 16 mode; GND for 512 × 8 mode; unconnected defaults to x16 (not valid on 1.8V variants) |
| DC | Don't Connect | No internal connection; must remain floating or tied to GND/VCC per layout guidelines - no drive capability |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configurable 512 × 8 or 256 × 16 layout eliminates firmware rework when memory width requirements change |
| Self-timed write cycle | Fixed 10 ms max duration enables deterministic firmware timing without polling or external delay loops |
| Ready/Busy status reporting | DO pin returns logic '0' during write/erase and '1' when complete - allows host to avoid blind waits |
| Automotive-grade qualification | Rated for −40°C to +85°C and AEC-Q100 stress testing - suitable for engine control units and ADAS sensors |
| No pre-erase requirement | Direct byte-write capability simplifies firmware design versus flash requiring sector erase before program |
Applications
| Industrial PLC Configuration Storage | Automotive Sensor Calibration Data |
|---|---|
Use Scenario: Storing I/O mapping, scaling coefficients, and fault thresholds in programmable logic controllers deployed in factory automation lines. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding persistent settings across power cycles; accessed during startup and runtime parameter adjustment. Use Value: Enables field-upgradable logic behavior without hardware changes; 1M endurance supports >10 years of daily recalibration events. |
Use Scenario: Retaining temperature-compensated offset/gain values for pressure or position sensors in engine management systems. IC Role / Device Role / Timing Role: Calibration data vault accessed once per ignition cycle; read during sensor initialization before closed-loop control begins. Use Value: Maintains accuracy over vehicle lifetime; 100-year retention exceeds OEM warranty and service life requirements. |
| Medical Device Serial Numbering | Consumer Appliance Settings Backup |
Use Scenario: Recording unique device identifiers, manufacturing date, and regulatory compliance codes in portable diagnostic instruments. IC Role / Device Role / Timing Role: Secure identity anchor written once at factory test; read during regulatory audit or firmware authentication handshake. Use Value: Tamper-resistant traceability without MCU flash wear; ORG pin flexibility allows same BOM for multiple product SKUs. |
Use Scenario: Saving user preferences (e.g., cooking time, temperature presets) in smart ovens and washing machines after power loss. IC Role / Device Role / Timing Role: Low-power backup memory updated infrequently (<100 writes/year); accessed on wake-up from standby mode. Use Value: Ultra-low standby current (6–10 µA at 2.7V) extends battery life in cordless appliances with backup power. |
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-2.7 | Successor with enhanced ESD rating (4 kV HBM), improved tSKH/tSKL timing margins, and extended 1.8V support | Recommended for new designs; backward-compatible pinout but requires updated firmware for optional 1.8V mode | Select when designing for long-term availability and higher robustness in noisy environments |
| M95M04-DRMN6TP/K | 4-Mbit SPI EEPROM (vs. 4-kbit), 2.5–5.5V, 20 MHz clock, WLCSP package - no ORG pin or x8/x16 selection | Higher density and speed, but incompatible interface and fixed 16-bit word width; requires PCB redesign | Choose only if migrating to SPI architecture and needing >10× more storage capacity |
Compared with AT93C66W-10SI-2.7, the AT93C66A-10SI-2.7 offers drop-in replacement with superior ESD immunity and broader voltage flexibility, while the M95M04-DRMN6TP/K demands interface and layout changes but delivers vastly greater capacity and throughput for next-gen platforms.
Availability
AT93C66W-10SI-2.7 is available at Aetrix Electronics and suitable for industrial control systems, automotive sensor modules, medical diagnostics equipment, and consumer appliance designs requiring stable component supply and long-lifecycle support.
Supply support for AT93C66W-10SI-2.7 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 reliability and long-term product support.
The AT93C66W-10SI-2.7 belongs to Microchip's legacy serial EEPROM family designed for cost-sensitive, space-constrained applications requiring simple, robust configuration storage - particularly where three-wire simplicity and automotive qualification are critical.
FAQ
What is the maximum clock frequency supported by AT93C66W-10SI-2.7?
The AT93C66W-10SI-2.7 supports up to 2 MHz SK clock frequency at VCC = 5.0V. At its rated 2.7V minimum supply, the maximum clock rate drops to 1 MHz. These values are specified in Table 4 of the official datasheet and reflect guaranteed timing margins across temperature and process variation - not typical or best-case figures.
Can AT93C66W-10SI-2.7 operate at 1.8V?
No, AT93C66W-10SI-2.7 is explicitly rated for 2.7V to 5.5V operation only. The "−2.7" suffix denotes the low-voltage 2.7V variant; 1.8V operation requires a different ordering code such as AT93C66W-10SI-1.8. Attempting 1.8V operation on AT93C66W-10SI-2.7 may result in unreliable reads/writes or failure to enter programming modes.
How does the ORG pin affect memory organization in AT93C66W-10SI-2.7?
In AT93C66W-10SI-2.7, connecting ORG to VCC selects 256 × 16 organization (256 words × 16 bits), while tying ORG to GND selects 512 × 8 (512 words × 8 bits). If left unconnected, the internal 1 MΩ pull-up asserts x16 mode - but this behavior is not guaranteed on 1.8V variants and is not applicable to AT93C66W-10SI-2.7's 2.7V operation.
Is AT93C66W-10SI-2.7 pin-compatible with AT93C66A-10SI-2.7?
Yes, AT93C66W-10SI-2.7 and AT93C66A-10SI-2.7 share identical 8-lead EIAJ SOIC (8S2) packaging and pinout. The AT93C66A-10SI-2.7 is a direct functional upgrade with improved ESD performance and extended voltage range, and Microchip confirms mechanical and electrical compatibility for drop-in replacement in existing designs.
What is the purpose of the DC pin on AT93C66W-10SI-2.7?
The DC (Don't Connect) pin on AT93C66W-10SI-2.7 has no internal connection and must remain unconnected in the circuit. It is not a ground or voltage reference; routing traces to it or applying bias risks unintended coupling or mechanical stress. The datasheet explicitly states "Don't Connect" - no pull-up, pull-down, or bypass capacitor should be attached.
AT93C66W-10SI-2.7 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:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT93C66W-10SI-2.7 FAQ
1.How can I place an order for AT93C66W-10SI-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66W-10SI-2.7 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-2.7 reliable?
The price and inventory of AT93C66W-10SI-2.7 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-2.7 is usually 5 days.
3.What payment methods are accepted for AT93C66W-10SI-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66W-10SI-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66W-10SI-2.7?
AT93C66W-10SI-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66W-10SI-2.7 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-2.7?
For technical support, including AT93C66W-10SI-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66W-10SI-2.7 requirements.
6.How does Aetrix verify that AT93C66W-10SI-2.7 is sourced from the original manufacturer or authorized distributors?
All AT93C66W-10SI-2.7 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-2.7 meets industry standards.
7.What is the process for return or replacement of AT93C66W-10SI-2.7?
All AT93C66W-10SI-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66W-10SI-2.7, 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-2.7 part is unused and in its original packaging.
Return procedure for AT93C66W-10SI-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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