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Microchip Technology AT93C66W-10SC-2.7
- Part No.:
- AT93C66W-10SC-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT93C66W-10SC-2.7.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,510
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Product details
Overview
AT93C66W-10SC-2.7 from Microchip Technology (formerly Atmel) is a 4-kbit serial EEPROM with 3-wire interface, configurable as 512 × 8 or 256 × 16 organization via ORG pin, operating at 2.7V–5.5V supply, supporting up to 2 MHz clock rate at 5V, and delivering 1 million write cycles with 100-year data retention - used for parameter storage in industrial control modules, automotive body electronics, and embedded sensor calibration.
For engineers reviewing the AT93C66W-10SC-2.7 datasheet, AT93C66W-10SC-2.7 pinout, AT93C66W-10SC-2.7 application, or AT93C66W-10SC-2.7 equivalent, key selection criteria include low-voltage operation down to 2.7V, self-timed 10 ms max write cycle, SOIC-8 package compatibility, and ORG-pin-selectable memory width for flexible host MCU interface alignment.
Technical Context
The AT93C66W-10SC-2.7 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. It uses an internal address decoder and shift register architecture to support both byte-wide and word-wide access modes selected by the ORG pin state.
Write operations require explicit Erase/Write Enable (EWEN) before programming; status feedback is provided via DO pin during CS high after tCS ≥ 250 ns. The device features internal pull-up on ORG (≈1 MΩ) for x16 default when unconnected, though this behavior is excluded in 1.8V variants - not applicable here since AT93C66W-10SC-2.7 is 2.7V–5.5V rated.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16 organization) |
| Supply Voltage Range | 2.7V to 5.5V - enables direct interface with 3.3V and 5V microcontrollers without level-shifting |
| Max Clock Frequency | 2 MHz at VCC = 5V; 1 MHz at VCC = 2.7V - defines maximum serial throughput for configuration reads/writes |
| Write Cycle Time | 10 ms maximum - determines minimum time between successive write commands; no external delay required |
| Endurance | 1,000,000 write cycles - supports frequent field updates in telemetry or calibration applications |
| Data Retention | 100 years at 25°C - ensures long-term reliability for firmware-locked configuration data |
| ESD Protection | >4000V HBM - provides robustness against handling and board-level ESD events |
Pinout & Package
AT93C66W-10SC-2.7 is housed in an 8-lead JEDEC-standard SOIC package (8S1), 0.150" wide, with gull-wing leads and standard 1.27 mm pitch. Pin 1 is marked by notch or bevel; rotation matches standard SOIC orientation (non-rotated).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must be held low for entire instruction sequence; controls READY/BUSY status output on DO |
| SK | Serial Clock | Synchronous edge-triggered input; rising edge latches DI, falling edge clocks DO; timing critical for AC compliance |
| DI | Data Input | Serial command/address/data input; accepts Start Bit (1), Op Code, Address, and Data fields per instruction |
| DO | Data Output | Tri-state serial output; delivers read data or READY/BUSY status depending on CS timing and instruction phase |
| VCC | Power Supply | Primary power rail; supports 2.7V–5.5V operation; decoupling capacitor recommended near pin |
| GND | Ground | Reference return path for all I/O and internal circuitry; must be low-impedance connection |
| ORG | Organization Select | Logic-high = 256 × 16 mode; logic-low = 512 × 8 mode; internal ~1 MΩ pull-up defaults to x16 if floating |
| DC | Don't Connect | No internal connection; must remain unconnected and unbonded; not tied to VCC/GND |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configurable 512×8 or 256×16 via ORG pin - eliminates software bit-packing overhead for 8-bit vs 16-bit MCU hosts |
| Self-timed write cycle | No external wait-state logic needed; DO pin signals completion via READY/BUSY - simplifies firmware timing control |
| Multi-voltage compatibility | Single part supports 2.7V–5.5V range - reduces BOM count across 3.3V and 5V system variants |
| Industrial temperature grade | -40°C to +85°C operation - qualified for under-hood automotive and factory-floor industrial environments |
| High-reliability nonvolatile storage | 1M write cycles + 100-year retention - suitable for lifetime-critical calibration and security keys |
Applications
| Automotive Body Control Module | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing door lock settings, mirror position presets, and lighting profiles in vehicle BCMs. IC Role / Device Role / Timing Role: Nonvolatile parameter EEPROM interfaced to 8-bit MCU via 3-wire SPI-compatible bus. Use Value: ORG pin allows 16-bit word access matching MCU's native data width, reducing firmware overhead during profile load/save. |
Use Scenario: Retaining I/O mapping, scaling coefficients, and alarm thresholds across power cycles in modular PLC bases. IC Role / Device Role / Timing Role: Serial configuration memory accessed during boot and runtime reconfiguration. Use Value: 2.7V min supply enables direct connection to 3.3V PLC backplane rails without regulator, saving board space and cost. |
| Medical Sensor Calibration Data | Consumer Appliance User Preferences |
Use Scenario: Holding factory-calibrated offset/gain values for analog front-end sensors in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-power serial EEPROM storing trim data read once at startup. Use Value: 100-year data retention ensures calibration integrity over full product lifecycle without recalibration service. |
Use Scenario: Saving user-selected cooking modes, timer presets, and display brightness in smart ovens and microwaves. IC Role / Device Role / Timing Role: Persistent storage element connected to appliance MCU's GPIO-controlled serial interface. Use Value: 1M endurance supports daily usage over 10+ years - exceeding typical appliance service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95640-WMN6TP | 4-kbit SPI interface (4-wire), 2.5V–5.5V, 20 MHz max clock, WIP/WEL status flags | Requires dedicated SPI peripheral; lacks ORG-pin organization flexibility | Preferred when host has hardware SPI and higher throughput (>2 MHz) is needed |
| CAT93C66VI-GT3 | 4-kbit 3-wire interface, 1.8V–5.5V, same pinout and instruction set, but 5 ms max write time | Lower voltage support enables 1.8V systems; faster write improves update latency | Drop-in replacement for AT93C66W-10SC-2.7 where 1.8V operation or reduced write time is required |
Compared with M95640-WMN6TP and CAT93C66VI-GT3, the AT93C66W-10SC-2.7 offers unique ORG-pin configurability for 8/16-bit alignment and proven industrial-temperature reliability in legacy 3-wire designs, making it optimal for cost-sensitive, pin-constrained, or backward-compatible implementations.
Availability
AT93C66W-10SC-2.7 is available at Aetrix Electronics and suitable for automotive body control, industrial PLC configuration, medical sensor calibration, and consumer appliance preference storage requiring stable component supply across extended product lifecycles.
Supply support for AT93C66W-10SC-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 acquired Atmel in 2016 and maintains full support for the legacy AT93C family of serial EEPROMs, ensuring long-term documentation, qualification, and supply chain continuity.
The AT93C66 series belongs to Microchip's industrial-grade serial EEPROM product line, designed specifically for reliable, low-pin-count nonvolatile storage in resource-constrained embedded systems where 3-wire simplicity and voltage flexibility are critical.
FAQ
What does the "W" in AT93C66W-10SC-2.7 signify?
The "W" suffix in AT93C66W-10SC-2.7 indicates EIAJ SOIC packaging (8S2), distinguishing it from JEDEC SOIC (8S1) versions like AT93C66-10SC-2.7. This affects mechanical footprint and soldering profile but retains identical electrical specifications, pinout, and functionality - both are fully compatible at the schematic and firmware level.
Can AT93C66W-10SC-2.7 operate reliably at 3.3V?
Yes, AT93C66W-10SC-2.7 operates reliably across 2.7V–5.5V, including standard 3.3V systems. At VCC = 3.3V, AC parameters adjust accordingly: max clock frequency is 1 MHz, tSKH/tSKL minimum is 500 ns, and ISB is ≤10 µA - all verified in the official datasheet's DC/AC Characteristics tables.
How is memory organization selected on AT93C66W-10SC-2.7?
Memory organization on AT93C66W-10SC-2.7 is selected via the ORG pin: tied to VCC for 256 × 16 mode, grounded for 512 × 8 mode. If left unconnected, the internal ~1 MΩ pull-up selects x16 mode. This hardware-selectable width eliminates firmware bit manipulation and aligns directly with 8-bit or 16-bit MCU data buses.
Does AT93C66W-10SC-2.7 support write protection?
AT93C66W-10SC-2.7 supports software-based write protection via the EWDS (Erase/Write Disable) instruction, which disables all programming functions until EWEN is issued again. There is no hardware write-protect pin; protection relies on controlled execution of EWDS after configuration writes, preventing accidental overwrites during normal operation.
What is the meaning of "-10SC-2.7" in AT93C66W-10SC-2.7?
In AT93C66W-10SC-2.7, "-10" denotes 10 ms maximum write cycle time, "SC" specifies 8-lead JEDEC SOIC package (8S1), and "-2.7" indicates guaranteed operation from 2.7V to 5.5V supply - confirming low-voltage capability essential for battery-backed or mixed-voltage designs.
AT93C66W-10SC-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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT93C66W-10SC-2.7 FAQ
1.How can I place an order for AT93C66W-10SC-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66W-10SC-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-10SC-2.7 reliable?
The price and inventory of AT93C66W-10SC-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-10SC-2.7 is usually 5 days.
3.What payment methods are accepted for AT93C66W-10SC-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66W-10SC-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66W-10SC-2.7?
AT93C66W-10SC-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66W-10SC-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-10SC-2.7?
For technical support, including AT93C66W-10SC-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66W-10SC-2.7 requirements.
6.How does Aetrix verify that AT93C66W-10SC-2.7 is sourced from the original manufacturer or authorized distributors?
All AT93C66W-10SC-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-10SC-2.7 meets industry standards.
7.What is the process for return or replacement of AT93C66W-10SC-2.7?
All AT93C66W-10SC-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66W-10SC-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-10SC-2.7 part is unused and in its original packaging.
Return procedure for AT93C66W-10SC-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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