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Microchip Technology AT93C66W-10SC
- Part No.:
- AT93C66W-10SC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT93C66W-10SC.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,193
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Product details
Overview
AT93C66W-10SC from Microchip Technology (formerly Atmel) is a 4-kbit serial EEPROM with 3-wire interface, user-selectable 512 × 8 or 256 × 16 organization via ORG pin, 2.7V–5.5V supply range, and self-timed 10 ms max write cycle. It operates in industrial temperature range (−40°C to +85°C) and is used for configuration storage in embedded controllers, power management ICs, and sensor calibration modules.
For engineers reviewing the AT93C66W-10SC datasheet, AT93C66W-10SC pinout, AT93C66W-10SC application, or AT93C66W-10SC equivalent, key selection criteria include voltage compatibility (2.7V min), 8-pin SOIC package footprint, 1 MHz max clock rate at 2.7V, and endurance of 1 million write cycles with 100-year data retention.
Technical Context
The AT93C66W-10SC implements a synchronous 3-wire serial interface (CS, SK, DI/DO) with instruction-based command set including READ, WRITE, ERASE, EWEN, and EWDS. Its internal organization is dynamically selected by the ORG pin: tied to VCC enables 256 × 16 mode; grounded enables 512 × 8 mode.
Write operations require prior execution of EWEN; all programming instructions are disabled after power-on reset until enabled. READY/BUSY status is reported on DO when CS is asserted high during self-timed tWP (≤10 ms), enabling host polling without fixed delay timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16 configurable) |
| Supply Voltage Range | 2.7V to 5.5V - supports mixed-voltage systems and battery-backed operation |
| Max Clock Frequency | 1 MHz at 2.7V - defines minimum SK period of 1000 ns for reliable timing margin |
| Write Cycle Time | ≤10 ms - self-timed; no external erase step required before write |
| Endurance | 1 million write cycles - ensures long-term field reliability in firmware update or logging use cases |
| Data Retention | 100 years at 25°C - guarantees nonvolatile storage integrity over product lifetime |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded applications |
Pinout & Package
AT93C66W-10SC 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 a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; device responds only when CS = low; DO enters high-impedance when CS = high |
| SK | Serial Clock | Synchronizes all data transfers; rising edge latches DI, falling edge samples DO |
| DI | Data Input | Receives instruction opcodes, addresses, and write data; sampled on SK rising edge |
| DO | Data Output | Transmits read data and READY/BUSY status; driven only when CS = low and instruction active |
| VCC | Power Supply | 2.7V–5.5V main supply; powers internal logic and memory array |
| GND | Ground | Reference return path for all signals and supply current |
| ORG | Organization Select | High = 256 × 16 mode; low = 512 × 8 mode; unconnected defaults to x16 via internal pull-up |
| DC | Don't Connect | No internal connection; must be left floating or tied to GND/VCC per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configurable 512 × 8 or 256 × 16 via ORG pin - eliminates need for software reconfiguration or multiple BOM variants |
| Low-voltage operation down to 2.7V | Full functionality at 2.7V supply - enables direct integration with 3.3V or battery-powered subsystems without level-shifting |
| Self-timed write cycle | Automatic internal timing (≤10 ms) - removes requirement for host-controlled write delays or status polling overhead |
| Industrial temperature qualification | −40°C to +85°C operation - validated for use in automotive body control modules and industrial PLC I/O cards |
| ESD protection >4000V | HBM-rated robustness - reduces risk of handling damage during assembly and field service |
Applications
| Printer Firmware Storage | Motor Drive Configuration |
|---|---|
Use Scenario: Storing printer model-specific settings, calibration tables, and firmware patch flags across power cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during boot sequence via SPI-compatible 3-wire interface. Use Value: Enables field-upgradable printer behavior without requiring external microcontroller memory management. |
Use Scenario: Holding motor phase alignment offsets, current limit thresholds, and commutation timing parameters in BLDC drives. IC Role / Device Role / Timing Role: Persistent parameter store read at startup and updated only during factory calibration or service mode. Use Value: Eliminates manual potentiometer adjustment and supports multi-motor variant reuse with same PCB layout. |
| Smart Sensor Calibration | Power Supply Trim Settings |
Use Scenario: Storing temperature-compensated gain/offset coefficients for MEMS accelerometers and environmental sensors. IC Role / Device Role / Timing Role: Low-power serial EEPROM interfaced to sensor hub MCU during production test and field recalibration. Use Value: Maintains sensor accuracy over lifetime without requiring battery-backed RAM or complex flash wear-leveling. |
Use Scenario: Retaining digitally trimmed output voltage and current limit values in programmable DC-DC controllers. IC Role / Device Role / Timing Role: Configuration memory mapped into PMIC's digital control loop during power-on initialization. Use Value: Achieves ±0.5% output regulation tolerance across manufacturing spread and thermal drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95M02-DRMN6TP/K | 2 Mbit SPI EEPROM, 1.8V–5.5V, 20 MHz interface, WLCSP package | Higher density and faster interface; requires SPI protocol stack vs. simpler 3-wire | Select when higher capacity or faster access is needed and SPI is already implemented |
| STK12C68-5BI5T | 8K-bit NVSRAM with automatic store/retrieve, 4.5V–5.5V only, SOIC-28 | Nonvolatile SRAM architecture; byte-write without delay but larger footprint and higher cost | Select when sub-μs random-access writes are critical and 5V-only supply is acceptable |
Compared with M95M02-DRMN6TP/K and STK12C68-5BI5T, the AT93C66W-10SC offers optimal balance of low-voltage support, compact 8-pin SOIC footprint, and minimal host interface complexity-ideal for cost-sensitive industrial controls where 4 kbit suffices and 3-wire simplicity reduces firmware overhead.
Availability
AT93C66W-10SC is available at Aetrix Electronics and suitable for industrial automation, power supply design, and embedded sensor systems requiring stable component supply across extended product lifecycles.
Supply support for AT93C66W-10SC 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 technical and manufacturing continuity for the AT93C family of serial EEPROMs.
The AT93C66W-10SC belongs to Microchip's legacy serial EEPROM product line, designed specifically for space-constrained, low-power embedded systems needing reliable nonvolatile storage with minimal pin count and protocol overhead.
FAQ
What is the maximum clock frequency supported by AT93C66W-10SC at 2.7V?
The AT93C66W-10SC supports a maximum SK clock frequency of 1 MHz when operated at 2.7V, corresponding to a minimum SK period of 1000 ns. This is specified in the AC Characteristics table under fSK for 2.7V ≤ VCC ≤ 5.5V. The AT93C66W-10SC maintains full read/write functionality within this timing constraint without requiring additional wait states or voltage scaling.
How does the ORG pin affect memory organization in AT93C66W-10SC?
In the AT93C66W-10SC, the ORG pin selects between two internal configurations: when tied to VCC, it enables 256 × 16 organization (256 words × 16 bits); when grounded, it enables 512 × 8 organization (512 words × 8 bits). If left unconnected, an internal ~1 MΩ pull-up defaults to x16 mode. This hardware-selectable structure allows one AT93C66W-10SC part number to serve dual data-width requirements without firmware changes.
Is AT93C66W-10SC compatible with 1.8V operation?
No, the AT93C66W-10SC is not rated for 1.8V operation. Its ordering code suffix "-2.7" explicitly denotes the 2.7V–5.5V supply range. While the AT93C66 family includes -1.8 variants (e.g., AT93C66W-10SC-1.8), the AT93C66W-10SC itself requires minimum 2.7V for guaranteed read/write functionality and timing compliance.
What is the purpose of the DC pin on AT93C66W-10SC?
The DC (Don't Connect) pin on the AT93C66W-10SC has no internal connection and must remain unconnected in the circuit. It is a mechanical placeholder to maintain 8-pin SOIC symmetry and is not used for biasing, testing, or any functional role. Leaving it floating is acceptable; tying it to GND or VCC is unnecessary and may risk unintended coupling in high-noise environments.
Does AT93C66W-10SC require a separate erase cycle before writing?
No, the AT93C66W-10SC does not require a separate erase cycle before writing. Each WRITE instruction automatically erases the target location prior to programming, and the entire write cycle-including erase-is self-timed and completes within ≤10 ms. The AT93C66W-10SC only requires prior execution of the EWEN instruction to enable programming modes; no explicit ERASE command is needed for standard single-location writes.
AT93C66W-10SC 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT93C66W-10SC FAQ
1.How can I place an order for AT93C66W-10SC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66W-10SC 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 reliable?
The price and inventory of AT93C66W-10SC 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 is usually 5 days.
3.What payment methods are accepted for AT93C66W-10SC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66W-10SC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66W-10SC?
AT93C66W-10SC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66W-10SC 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?
For technical support, including AT93C66W-10SC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66W-10SC requirements.
6.How does Aetrix verify that AT93C66W-10SC is sourced from the original manufacturer or authorized distributors?
All AT93C66W-10SC 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 meets industry standards.
7.What is the process for return or replacement of AT93C66W-10SC?
All AT93C66W-10SC units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66W-10SC, 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 part is unused and in its original packaging.
Return procedure for AT93C66W-10SC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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