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Microchip Technology AT93C66-10SC-2.5
- Part No.:
- AT93C66-10SC-2.5
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT93C66-10SC-2.5.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,692
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Product details
Overview
AT93C66-10SC-2.5 from Microchip Technology (formerly Atmel) is a 4-kbit serial EEPROM with 3-wire interface, supporting 512 × 8 or 256 × 16 organization selectable via ORG pin, 2.5V–5.5V supply range, 10 ms max self-timed write cycle, and 1 million write endurance. It serves as nonvolatile configuration storage in embedded controllers, power management units, and sensor calibration modules.
For engineers reviewing the AT93C66-10SC-2.5 datasheet, AT93C66-10SC-2.5 pinout, AT93C66-10SC-2.5 application, or AT93C66-10SC-2.5 equivalent, key selection criteria include low-voltage operation down to 2.5V, dual-word-width flexibility, industrial temperature support (−40°C to +85°C), and JEDEC SOIC-8 package compatibility with legacy board layouts.
Technical Context
The AT93C66-10SC-2.5 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 architecture supports dynamic word-width selection (8-bit or 16-bit) via the ORG pin, enabling memory mapping adaptability without firmware changes.
Write operations are fully self-timed with READY/BUSY status reported on DO when CS is asserted post-instruction; no external timing control is required. The device operates across VCC = 2.5V–5.5V with guaranteed AC timing at 500 kHz maximum clock rate under 2.5V conditions, and maintains data retention for 100 years.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16 words), enabling compact storage of calibration tables or boot parameters |
| Supply Voltage Range | 2.5V to 5.5V - supports direct interfacing with 2.5V/3.3V logic without level shifters |
| Write Cycle Time | Max 10 ms - deterministic erase-and-write eliminates need for timeout polling in time-critical firmware |
| Endurance | 1 million write cycles - suitable for systems requiring frequent field-updatable settings |
| Data Retention | 100 years at 25°C - ensures long-term reliability in unattended industrial deployments |
| Interface Speed | 500 kHz max clock (SK) at 2.5V - balances speed and noise immunity in low-power designs |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded applications |
Pinout & Package
AT93C66-10SC-2.5 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; orientation follows JEDEC MS-001 BA outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable: must be low during entire instruction sequence; high state places DO in high-impedance or reports READY/BUSY |
| SK | Serial Clock | Synchronous edge-triggered input controlling bit transfer timing; rising edge samples DI, falling edge outputs DO |
| DI | Data Input | Serial command/address/data input; accepts 7-bit address + 2-bit opcode + optional data per instruction |
| DO | Data Output | Open-drain output delivering read data or READY/BUSY status; requires external pull-up |
| VCC | Power Supply | Primary supply rail (2.5V–5.5V); powers internal logic and charge pump for write/erase |
| GND | Ground | Reference return path for all signals and internal circuitry |
| ORG | Organization Select | Logic-high selects 256 × 16 mode; logic-low selects 512 × 8 mode; internal ~1 MΩ pull-up defaults to x16 if floating |
| DC | Don't Connect | No internal connection; must remain unconnected or tied to GND/VCC only if required by PCB layout constraints |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configurable 512 × 8 or 256 × 16 layout via ORG pin - avoids firmware rework when memory access patterns change |
| Self-timed write cycle | No external wait-state generation needed; READY/BUSY status accessible on DO after CS assertion - simplifies host controller timing design |
| Low-voltage operation | Functional down to 2.5V with full AC/DC specs - enables direct integration into battery-powered or energy-harvesting subsystems |
| High-reliability nonvolatile storage | 1M write cycles and 100-year data retention - meets long-lifecycle requirements for industrial automation and metering |
| ESD protection | >4000V HBM - reduces risk of field failure during handling or system-level ESD events |
Applications
| Industrial Sensor Calibration | Embedded Power Management |
|---|---|
Use Scenario: Storing factory-trimmed offset/gain coefficients and temperature compensation tables for analog sensor front-ends. IC Role / Device Role / Timing Role: Nonvolatile configuration register providing persistent parameter storage accessed during system boot and runtime recalibration. Use Value: Enables plug-and-play sensor replacement without manual recalibration; ORG pin flexibility allows same firmware to support 8-bit or 16-bit coefficient formats. |
Use Scenario: Holding user-defined voltage/current limits, fault thresholds, and startup sequencing parameters in DC-DC controller modules. IC Role / Device Role / Timing Role: Configuration EEPROM interfaced to PMIC's I²C/SPI bridge or directly to microcontroller GPIOs for secure settings persistence. Use Value: Maintains safety-critical settings across power cycles; 2.5V operation allows direct connection to low-voltage PMIC rails without level translation. |
| Consumer Device Identity Storage | Automotive Body Control Module |
Use Scenario: Storing unique device identifiers (MAC, serial number), regional settings, and user preferences in smart home hubs and audio equipment. IC Role / Device Role / Timing Role: Serial configuration memory accessed during initialization to personalize UI behavior and network stack configuration. Use Value: Supports mass customization in manufacturing; 1M endurance accommodates over-the-air update logging without premature wear-out. |
Use Scenario: Retaining door lock programming, mirror position presets, and lighting profiles in automotive BCMs operating across extended temperature ranges. IC Role / Device Role / Timing Role: Industrial-grade EEPROM interfaced to 8-bit/16-bit MCU via minimal GPIOs, surviving automotive thermal cycling and vibration. Use Value: −40°C to +85°C rating ensures reliable operation in under-hood and cabin environments; SOIC-8 footprint matches legacy automotive PCB designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95M04-DRMN6TP/K | 4-Mbit SPI interface, 1.7V–5.5V supply, 5ms write cycle; uses SPI protocol instead of 3-wire | Requires SPI-capable host; not pin-compatible; higher density but larger package (8-lead TSSOP) | Select when migrating to SPI infrastructure or needing >4kbit capacity; verify host driver compatibility |
| STK12C68-55I | 8-kbit NVSRAM with parallel interface, 4.5V–5.5V only, 55ns access; volatile+nonvolatile hybrid | Parallel bus interface demands more MCU pins; no low-voltage (2.5V) support; faster random access but higher power | Choose for applications requiring nanosecond-level read latency and frequent read-modify-write cycles, not low-voltage operation |
Compared with M95M04-DRMN6TP/K and STK12C68-55I, the AT93C66-10SC-2.5 offers optimal balance of ultra-low-voltage compatibility, minimal pin count (3-wire), proven industrial reliability, and drop-in replaceability in existing SOIC-8 footprints - making it ideal for cost-sensitive, space-constrained, and thermally demanding embedded systems.
Availability
AT93C66-10SC-2.5 is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded power management, consumer device identity storage, and automotive body control module applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT93C66-10SC-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 continues to manufacture, qualify, and support the AT93C family of serial EEPROMs with full backward compatibility and long-term product roadmaps.
The AT93C66-10SC-2.5 belongs to Microchip's legacy serial EEPROM product line, designed specifically for low-pin-count, low-power, and industrial-grade nonvolatile storage where simplicity, reliability, and voltage flexibility outweigh high-speed or high-density requirements.
FAQ
What is the maximum clock frequency supported by AT93C66-10SC-2.5 at 2.5V?
The AT93C66-10SC-2.5 supports a maximum SK clock frequency of 500 kHz when operated at VCC = 2.5V, as specified in the AC Characteristics table. This value is guaranteed across the full industrial temperature range (−40°C to +85°C) and ensures robust signal integrity in low-noise, low-power designs. The AT93C66-10SC-2.5 maintains full functionality at this rate without timing margin violations.
How does the ORG pin affect memory organization in AT93C66-10SC-2.5?
When ORG is tied to VCC, the AT93C66-10SC-2.5 configures as 256 × 16 (256 words × 16 bits); when grounded, it configures as 512 × 8 (512 words × 8 bits). If left unconnected, an internal ~1 MΩ pull-up selects the 256 × 16 mode. This hardware-selectable organization allows one AT93C66-10SC-2.5 part to serve multiple firmware architectures without redesign.
Is AT93C66-10SC-2.5 compatible with 1.8V systems?
No - the AT93C66-10SC-2.5 is rated for 2.5V to 5.5V operation only. While earlier AT93C46 variants support 1.8V, the AT93C66-10SC-2.5 datasheet explicitly lists VCC2 = 2.5V–5.5V as its valid supply range. Attempting 1.8V operation may result in undefined behavior, failed writes, or excessive standby current. Use AT93C66-10SC-1.8 only for 1.8V systems.
What is the purpose of the DC pin on AT93C66-10SC-2.5?
The DC (Don't Connect) pin on AT93C66-10SC-2.5 has no internal connection and must remain unconnected in the circuit. It exists solely for mechanical symmetry in the SOIC-8 package and carries no electrical function. Connecting DC to VCC, GND, or any signal risks unintended leakage paths or package stress; the AT93C66-10SC-2.5 functions correctly with DC floating.
Does AT93C66-10SC-2.5 require an external pull-up resistor on the DO pin?
Yes - the DO pin is open-drain and requires an external pull-up resistor (typically 4.7 kΩ to VCC) to ensure valid logic-high levels during READ operations and READY/BUSY status reporting. Without this pull-up, DO remains indeterminate or weakly driven, causing communication failures. This requirement is consistent across all AT93C66-10SC-2.5 operating voltages and temperatures.
AT93C66-10SC-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
AT93C66-10SC-2.5 FAQ
1.How can I place an order for AT93C66-10SC-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66-10SC-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 AT93C66-10SC-2.5 reliable?
The price and inventory of AT93C66-10SC-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 AT93C66-10SC-2.5 is usually 5 days.
3.What payment methods are accepted for AT93C66-10SC-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66-10SC-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66-10SC-2.5?
AT93C66-10SC-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66-10SC-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 AT93C66-10SC-2.5?
For technical support, including AT93C66-10SC-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66-10SC-2.5 requirements.
6.How does Aetrix verify that AT93C66-10SC-2.5 is sourced from the original manufacturer or authorized distributors?
All AT93C66-10SC-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 AT93C66-10SC-2.5 meets industry standards.
7.What is the process for return or replacement of AT93C66-10SC-2.5?
All AT93C66-10SC-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66-10SC-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 AT93C66-10SC-2.5 part is unused and in its original packaging.
Return procedure for AT93C66-10SC-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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