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Microchip Technology AT93C66W-10SC-2.5
- Part No.:
- AT93C66W-10SC-2.5
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT93C66W-10SC-2.5.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,929
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Product details
Overview
AT93C66W-10SC-2.5 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 VCC = 2.5V to 5.5V, and rated for industrial temperature range (−40°C to +85°C). It delivers 1 million write cycles, 100-year data retention, and supports up to 500 kHz clock rate at 2.5V.
For engineers reviewing the AT93C66W-10SC-2.5 datasheet, AT93C66W-10SC-2.5 pinout, AT93C66W-10SC-2.5 application, or AT93C66W-10SC-2.5 equivalent, key selection factors include low-voltage operation down to 2.5V, self-timed 10 ms max write cycle, SOIC-8 EIAJ package with rotated pinout, and compatibility with microcontroller-based configuration storage in constrained power systems.
Technical Context
The AT93C66W-10SC-2.5 implements a synchronous 3-wire serial interface (CS, SK, DI/DO) with start-bit–driven instruction set including READ, WRITE, ERASE, EWEN, and EWDS. Its internal organization is user-selectable via the ORG pin: tied to VCC selects 256 × 16 mode; grounded selects 512 × 8 mode.
It operates without external erase cycles-WRITE and ERASE are self-timed (tWP ≤ 10 ms), and READY/BUSY status is returned on DO when CS is asserted post-instruction. The "W" suffix denotes EIAJ SOIC (8S2) package with rotated pinout, distinct from standard JEDEC SOIC (8S1).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16), enabling compact nonvolatile storage for calibration data or device IDs |
| Supply Voltage Range | 2.5V to 5.5V - supports direct interfacing with 2.5V/3.3V logic without level shifters |
| Max Clock Frequency | 500 kHz at VCC = 2.5V - ensures reliable timing margin in low-power embedded control loops |
| Write Endurance | 1 million cycles - suitable for frequent field-updatable parameter logging |
| Data Retention | 100 years at 25°C - guarantees long-term integrity of factory-programmed settings |
| Operating Temperature | −40°C to +85°C - qualified for industrial automation and automotive body electronics |
| ESD Protection | >4000V HBM - robust against handling and board-level electrostatic discharge |
Pinout & Package
AT93C66W-10SC-2.5 uses an 8-lead EIAJ SOIC (8S2) package with rotated pinout (as specified in Rev. 0172L–10/99, page 2). Pin 1 is CS; pin 2 is SK; pin 3 is DI; pin 4 is DO; pin 5 is VCC; pin 6 is DC (no connect); pin 7 is ORG; pin 8 is GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable: must be held low during instruction transfer; high state returns DO to high-Z or outputs READY/BUSY |
| 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; requires setup/hold timing per AC specs |
| DO | Data Output | Outputs read data or READY/BUSY status; high-impedance when CS is high and no status query active |
| VCC | Power Supply | 2.5V–5.5V supply input; decoupling capacitor required near pin for noise immunity |
| DC | Don't Connect | No internal connection; must remain unconnected to avoid undefined behavior |
| ORG | Organization Select | High = 256 × 16 mode; low = 512 × 8 mode; floating defaults to x16 via internal ~1 MΩ pull-up |
| GND | Ground | Reference return path for VCC and I/O signals; should be low-impedance plane |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configurable 512 × 8 or 256 × 16 layout via ORG pin - eliminates firmware rework across product variants |
| Low-voltage operation | Functional down to 2.5V VCC - enables direct integration into 2.5V system rails without regulator overhead |
| Self-timed write cycle | Max 10 ms tWP with no external timing control - simplifies host software and removes need for polling delays |
| Industrial temperature rating | −40°C to +85°C operation - validated for deployment in motor drives, PLCs, and outdoor IoT nodes |
| Rotated SOIC pinout | EIAJ-compliant 8S2 footprint (pin 1 = CS, pin 7 = ORG) - provides mechanical differentiation from JEDEC SOIC variants |
Applications
| Industrial Sensor Calibration | Embedded System Configuration |
|---|---|
|
Use Scenario: Storing temperature-compensated offset/gain coefficients for analog sensor front-ends in factory-calibrated modules. IC Role / Device Role / Timing Role: Nonvolatile parameter storage accessed during power-on initialization; read-only during runtime. Use Value: Eliminates need for external calibration hardware; retains accuracy across 100-year lifetime without refresh. |
Use Scenario: Holding boot-time configuration flags (e.g., UART baud rate, display orientation, network MAC address) in medical handheld devices. IC Role / Device Role / Timing Role: Serial configuration store interfaced directly to MCU GPIOs using bit-banged 3-wire protocol. Use Value: Reduces BOM count vs. parallel EEPROM; 2.5V compatibility avoids level-shifter components. |
| Automotive Body Control | Consumer Appliance Settings |
|
Use Scenario: Saving user preferences (mirror position, seat memory, lighting profiles) in automotive door modules. IC Role / Device Role / Timing Role: Low-power EEPROM accessed intermittently over LIN or discrete wake-up lines. Use Value: −40°C to +85°C rating ensures reliability under hood temperature cycling; 1M endurance supports daily rewrites. |
Use Scenario: Retaining cooking program history and child-lock state in smart ovens after AC power loss. IC Role / Device Role / Timing Role: Standalone serial memory with <10 µA ISB2 standby current at 2.5V - extends battery backup life. Use Value: Self-timed writes prevent MCU lockup during power brownouts; no erase-before-write simplifies firmware. |
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, SO-8 (JEDEC), 5 MHz max clock | Requires dedicated SPI peripheral; higher speed but less pin-efficient than 3-wire | Choose for systems with available SPI hardware and need for faster bulk reads |
| AT25640B-SSHL-T | 4-kbit SPI interface, 1.8V–5.5V, SO-8 (JEDEC), 20 MHz max clock, 4-byte page write | Lower 1.8V min VCC; supports faster sequential writes but lacks ORG pin flexibility | Prefer when interfacing with 1.8V MCUs or requiring >500 kHz throughput |
Compared with AT93C66W-10SC-2.5, the M95640-WMN6TP and AT25640B-SSHL-T offer SPI compatibility and higher clock rates but require additional chip select and MOSI/MISO lines, whereas AT93C66W-10SC-2.5 achieves minimal GPIO usage and hardware-configurable word width - critical for legacy or resource-constrained designs.
Availability
AT93C66W-10SC-2.5 is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, automotive body control, and consumer appliance settings requiring stable component supply across extended temperature and low-voltage conditions.
Supply support for AT93C66W-10SC-2.5 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 AT93C family of serial EEPROMs, emphasizing reliability, longevity, and broad voltage compatibility.
The AT93C66W-10SC-2.5 belongs to Microchip's legacy serial EEPROM product line, designed specifically for cost-sensitive, low-pin-count embedded systems needing robust nonvolatile storage without complex interface logic.
FAQ
What does the "W" in AT93C66W-10SC-2.5 signify?
The "W" suffix in AT93C66W-10SC-2.5 indicates the EIAJ SOIC package (8S2) with rotated pinout - specifically, pin 1 = CS, pin 2 = SK, pin 3 = DI, pin 4 = DO, pin 5 = VCC, pin 6 = DC, pin 7 = ORG, pin 8 = GND. This differs from standard JEDEC SOIC (8S1) pin assignments and ensures mechanical compatibility with EIAJ footprints.
Can AT93C66W-10SC-2.5 operate reliably at exactly 2.5V?
Yes, AT93C66W-10SC-2.5 is fully specified for operation at VCC = 2.5V to 5.5V. At 2.5V, its maximum clock frequency is 500 kHz, standby current (ISB2) is 6–10 µA, and write cycle time (tWP) remains ≤10 ms - all guaranteed across the industrial temperature range (−40°C to +85°C).
How is memory organization selected on AT93C66W-10SC-2.5?
Memory organization on AT93C66W-10SC-2.5 is selected via the ORG pin: connecting ORG to VCC configures the device as 256 × 16 (16-bit words), while grounding ORG selects 512 × 8 (8-bit words). If left unconnected, an internal ~1 MΩ pull-up defaults to x16 mode - though this behavior is not supported on 1.8V variants.
Does AT93C66W-10SC-2.5 require a separate erase cycle before writing?
No, AT93C66W-10SC-2.5 does not require a separate erase cycle. Each WRITE instruction automatically erases and reprograms the target location in a single self-timed operation (tWP ≤ 10 ms). ERASE instructions are optional and used only for selective or full-array clearing - not prerequisite for WRITE.
What is the purpose of the DC pin on AT93C66W-10SC-2.5?
The DC (Don't Connect) pin on AT93C66W-10SC-2.5 has no internal connection and must remain unconnected in the PCB layout. Routing or soldering to this pin may cause unpredictable behavior or damage; it exists solely for package compatibility and mechanical alignment in the 8S2 SOIC footprint.
AT93C66W-10SC-2.5 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:
- 2.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT93C66W-10SC-2.5 FAQ
1.How can I place an order for AT93C66W-10SC-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66W-10SC-2.5 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-2.5 reliable?
The price and inventory of AT93C66W-10SC-2.5 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-2.5 is usually 5 days.
3.What payment methods are accepted for AT93C66W-10SC-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66W-10SC-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66W-10SC-2.5?
AT93C66W-10SC-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66W-10SC-2.5 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-2.5?
For technical support, including AT93C66W-10SC-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66W-10SC-2.5 requirements.
6.How does Aetrix verify that AT93C66W-10SC-2.5 is sourced from the original manufacturer or authorized distributors?
All AT93C66W-10SC-2.5 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-2.5 meets industry standards.
7.What is the process for return or replacement of AT93C66W-10SC-2.5?
All AT93C66W-10SC-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66W-10SC-2.5, 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-2.5 part is unused and in its original packaging.
Return procedure for AT93C66W-10SC-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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