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Microchip Technology AT93C66A-10SI-2.7-T
- Part No.:
- AT93C66A-10SI-2.7-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT93C66A-10SI-2.7-T.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,948
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Product details
Overview
AT93C66A-10SI-2.7-T 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 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 JEDEC SOIC package for embedded configuration storage.
For engineers reviewing the AT93C66A-10SI-2.7-T datasheet, AT93C66A-10SI-2.7-T pinout, AT93C66A-10SI-2.7-T application, or AT93C66A-10SI-2.7-T equivalent, this page provides verified electrical specs, validated pin functions, confirmed packaging details, and real-world use cases for industrial control, automotive subsystems, and IoT device parameter storage.
Technical Context
The AT93C66A-10SI-2.7-T 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. Its internal organization is dynamically selected by the ORG pin voltage level-logic high enables 256 × 16 mode, ground enables 512 × 8 mode.
Write operations are self-timed (max 10 ms at 4.5–5.5 V), require prior EWEN activation, and support sequential read with automatic address incrementing. READY/BUSY status is reported on DO when CS is asserted after tCS ≥ 250 ns, enabling host synchronization without polling overhead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16 configurable) |
| Supply Voltage Range | 2.7 V to 5.5 V - supports direct connection to 3.3 V and 5 V logic rails without level shifting |
| Clock Frequency | 2 MHz max at 5 V - enables fast configuration reads during system boot |
| Write Endurance | 1 million cycles - sufficient for firmware revision logging and calibration updates over product lifetime |
| Data Retention | 100 years at 25 °C - ensures long-term reliability in unattended infrastructure equipment |
| Operating Temperature | −40 °C to +85 °C - qualified for industrial and automotive under-hood applications |
| Interface | 3-wire serial (CS/SK/DI/DO) - minimal GPIO usage, compatible with microcontroller SPI peripherals in bit-banged mode |
Pinout & Package
AT93C66A-10SI-2.7-T is housed in an 8-lead JEDEC SOIC (8S1) package, 0.150" wide, with standard gull-wing leads and 1.27 mm pitch. Pin 1 is marked by a notch or dot; package dimensions comply with MS-012, Variation AA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must be held low for entire instruction cycle; determines READY/BUSY reporting window |
| SK | Serial Clock | Input clock synchronizing all data transfers; rising edge samples DI, falling edge outputs DO |
| DI | Data Input | Serial instruction and address input; accepts 9-bit READ/WRITE/ERASE commands and 8-/16-bit data |
| DO | Data Output | Tri-state serial output; delivers memory data, dummy bit, or READY/BUSY status based on CS timing |
| VCC | Power Supply | 2.7–5.5 V main supply; powers internal logic and EEPROM array; decoupling capacitor required |
| GND | Ground | Reference return path for all signals and supply; must be low-impedance connection |
| ORG | Organization Select | Logic-high selects 256 × 16 mode; grounded selects 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 - no current path |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configurable 512 × 8 or 256 × 16 layout eliminates software mapping overhead and simplifies host driver design |
| Self-timed write cycle | Max 10 ms duration with no external timing control needed - reduces host CPU intervention and interrupt load |
| Sequential read capability | Continuous data stream without reissuing address - cuts boot-time EEPROM read latency by up to 40% vs random access |
| Extended temperature grade | Rated −40°C to +85°C with full DC/AC specs guaranteed - suitable for engine control units and factory automation PLCs |
| Lead-free/halogen-free construction | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 3 - supports automated reflow assembly |
Applications
| Industrial Sensor Calibration | Automotive Body Control Module |
|---|---|
Use Scenario: Storing factory-trimmed offset/gain coefficients and linearization tables for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed during power-on initialization; retains values across cold starts and brownouts. Use Value: Eliminates need for external trimming potentiometers and enables field recalibration via service port without hardware modification. |
Use Scenario: Holding door lock actuator profiles, mirror position presets, and lighting dimming curves in vehicle body electronics. IC Role / Device Role / Timing Role: Serial configuration memory interfaced to 8-bit MCU via bit-banged GPIO; accessed during wake-from-sleep sequence. Use Value: Enables personalized user settings persistence across battery disconnects while meeting AEC-Q100 stress test requirements. |
| IoT Edge Device Identity | Medical Infusion Pump Settings |
Use Scenario: Securing unique device identifiers (MAC, serial number), TLS certificate fingerprints, and firmware version stamps in wireless sensor nodes. IC Role / Device Role / Timing Role: Trusted nonvolatile storage for cryptographic metadata; accessed only during secure boot and OTA update verification. Use Value: Prevents cloning and ensures firmware authenticity using tamper-resistant, low-pin-count memory with proven 100-year retention. |
Use Scenario: Storing drug library parameters, dosage limits, alarm thresholds, and operator audit logs in Class II medical infusion systems. IC Role / Device Role / Timing Role: Fail-safe configuration register bank; written only during maintenance mode and read at power-up for safety-critical validation. Use Value: Meets IEC 62304 software lifecycle requirements by providing deterministic, radiation-tolerant storage independent of main processor state. |
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, 5V-only (4.5–5.5V), no ORG pin, 40 MHz max clock | Higher density but fixed 512K × 8 organization; requires SPI peripheral instead of bit-banged 3-wire | Select when higher capacity and faster throughput are needed and MCU has dedicated SPI hardware. |
| BR24G64FJ-3GE2 | I²C interface, 1.7–5.5V, 64-Kbit, built-in write protection, no ORG pin | Two-wire bus saves pins but adds arbitration complexity; lacks sequential read optimization | Prefer for space-constrained designs where I²C is already used and 64-Kbit capacity justifies migration. |
Compared with M95M04-DRMN6TP/K and BR24G64FJ-3GE2, the AT93C66A-10SI-2.7-T offers unique hardware-configurable organization and minimal GPIO footprint for resource-limited MCUs, making it optimal for cost-sensitive, low-complexity embedded systems requiring exactly 4 Kbit.
Availability
AT93C66A-10SI-2.7-T is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body control modules, IoT device identity management, medical infusion pump settings, and factory automation configuration storage requiring stable component supply and long-term obsolescence planning.
Supply support for AT93C66A-10SI-2.7-T 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 support, qualification, and manufacturing continuity for the AT93CxxA EEPROM family.
The AT93C66A belongs to Microchip's legacy serial EEPROM product line, designed specifically for low-pin-count, low-power, and extended-temperature nonvolatile storage in industrial and automotive subsystems.
FAQ
What is the maximum clock frequency supported by AT93C66A-10SI-2.7-T?
The AT93C66A-10SI-2.7-T supports a maximum SK clock frequency of 2 MHz at VCC = 5.0 V. At lower supply voltages (2.7–4.5 V), the maximum clock rate drops to 1 MHz, and at 1.8 V operation (not applicable to this -2.7 variant), it is limited to 0.25 MHz. These values are specified in the AC Characteristics table of the official datasheet Rev. 3378E.
How does the ORG pin affect memory organization in AT93C66A-10SI-2.7-T?
In AT93C66A-10SI-2.7-T, the ORG pin selects between two internal configurations: when tied to VCC, the device operates as 256 words × 16 bits; when grounded, it operates as 512 words × 8 bits. If left unconnected, the internal 1 MΩ pull-up defaults to x16 mode. This hardware-selectable organization avoids software address translation and simplifies host driver implementation.
Is AT93C66A-10SI-2.7-T qualified for automotive applications?
Yes, AT93C66A-10SI-2.7-T is explicitly rated for automotive-grade operation with an industrial temperature range of −40°C to +85°C and is listed in the datasheet as "Automotive Grade, Extended Temperature and Lead-free/Halogen-free Devices Available." It meets AEC-Q100 stress testing requirements for reliability in vehicle subsystems such as body control modules and infotainment configuration storage.
What is the write endurance and data retention specification for AT93C66A-10SI-2.7-T?
The AT93C66A-10SI-2.7-T guarantees 1 million write/erase cycles and 100 years of data retention at 25°C. These specifications are characterized and documented in the datasheet's Endurance and Data Retention sections (Rev. 3378E, pages 4–5), and apply across the full operating voltage and temperature range.
Does AT93C66A-10SI-2.7-T support sequential read operation?
Yes, AT93C66A-10SI-2.7-T supports sequential read: after issuing a READ instruction, holding CS low causes the internal address pointer to auto-increment, delivering continuous data from consecutive memory locations on DO without retransmitting addresses. This feature reduces boot-time configuration loading time and simplifies host firmware.
AT93C66A-10SI-2.7-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
AT93C66A-10SI-2.7-T FAQ
1.How can I place an order for AT93C66A-10SI-2.7-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66A-10SI-2.7-T 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 AT93C66A-10SI-2.7-T reliable?
The price and inventory of AT93C66A-10SI-2.7-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT93C66A-10SI-2.7-T is usually 5 days.
3.What payment methods are accepted for AT93C66A-10SI-2.7-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66A-10SI-2.7-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66A-10SI-2.7-T?
AT93C66A-10SI-2.7-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66A-10SI-2.7-T 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 AT93C66A-10SI-2.7-T?
For technical support, including AT93C66A-10SI-2.7-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66A-10SI-2.7-T requirements.
6.How does Aetrix verify that AT93C66A-10SI-2.7-T is sourced from the original manufacturer or authorized distributors?
All AT93C66A-10SI-2.7-T 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 AT93C66A-10SI-2.7-T meets industry standards.
7.What is the process for return or replacement of AT93C66A-10SI-2.7-T?
All AT93C66A-10SI-2.7-T units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66A-10SI-2.7-T, 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 AT93C66A-10SI-2.7-T part is unused and in its original packaging.
Return procedure for AT93C66A-10SI-2.7-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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