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Microchip Technology AT93C66A-10SU-1.8
- Part No.:
- AT93C66A-10SU-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT93C66A-10SU-1.8.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,140
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Product details
Overview
AT93C66A-10SU-1.8 from Microchip Technology (formerly Atmel) is a 4-kbit serial EEPROM with three-wire interface, user-selectable 512×8 or 256×16 organization via ORG pin, 1.8V–5.5V supply range, and 2 MHz clock rate at 5V. It delivers 1 million write cycles and 100-year data retention for embedded configuration storage in industrial controllers and sensor nodes.
For engineers reviewing the AT93C66A-10SU-1.8 datasheet, AT93C66A-10SU-1.8 pinout, AT93C66A-10SU-1.8 application, or AT93C66A-10SU-1.8 equivalent, key selection criteria include low-voltage operation down to 1.8V, self-timed 10 ms max write cycle, sequential read capability, standby current as low as 0.4 µA at 1.8V, and compatibility with JEDEC SOIC-8 packaging.
Technical Context
The AT93C66A-10SU-1.8 implements a synchronous three-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 state-logic high enables 256-word × 16-bit mode, logic low selects 512-word × 8-bit mode.
Operation requires Erase/Write Enable (EWEN) before programming; all write cycles are self-timed with Ready/Busy status reported on DO when CS is asserted post-command. The device supports sequential read with automatic address increment and dummy-bit suppression between words, enabling efficient bulk data retrieval without host address management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16), enabling compact firmware parameter or calibration storage |
| Supply Voltage Range | 1.8V to 5.5V - supports direct interface with 1.8V logic and legacy 3.3V/5V systems |
| Max Clock Frequency | 2 MHz at VCC = 5V - permits fast configuration reads in time-critical boot sequences |
| Write Cycle Time | ≤10 ms - defines minimum delay between write commands; no external timing control needed |
| Endurance | 1 million write cycles - suitable for field-updatable settings with daily rewrites over 27 years |
| Data Retention | 100 years at +25°C - ensures long-term reliability in unpowered storage applications |
| Standby Current | 0.4 µA at VCC = 1.8V - critical for battery-backed real-time clocks and energy-harvesting sensors |
Pinout & Package
AT93C66A-10SU-1.8 is packaged in an 8-lead JEDEC SOIC (8S1) with 0.150" body width, RoHS-compliant lead finish, and industrial temperature range (−40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must be held low during instruction execution and address/data transfer |
| SK | Serial Clock | Synchronizes all data transfers; rising edge samples DI, falling edge outputs DO |
| DI | Data Input | Receives start bit, op code, address, and write data; latched on SK rising edge |
| DO | Data Output | Serially outputs read data or Ready/Busy status; high-Z when CS is high |
| GND | Ground Reference | Return path for VCC and all I/O signals; must be low-impedance for noise immunity |
| VCC | Power Supply | 1.8V–5.5V input; powers internal logic and memory array; decoupling capacitor required |
| ORG | Organization Select | Logic high = 256×16 mode; logic low = 512×8 mode; internal 1 MΩ pull-up defaults to x16 |
| NC | No Connect | Unbonded pin; must remain floating or tied to GND/VCC per PCB layout constraints |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configurable 512×8 or 256×16 layout eliminates need for software remapping |
| Self-timed write cycle | Internal timing engine removes requirement for external write-delay circuitry or polling overhead |
| Sequential read operation | Continuous data stream across multiple addresses reduces host CPU intervention and SPI transaction count |
| Low-voltage 1.8V operation | Enables direct integration with ultra-low-power microcontrollers and battery-powered IoT endpoints |
| Ready/Busy status reporting | DO pin returns logic level indicating write completion-enables deterministic interrupt-driven writes |
Applications
| Industrial PLC Configuration Storage | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Storing calibrated sensor offsets, I/O mapping tables, and firmware update flags in programmable logic controllers operating in factory environments. IC Role / Device Role / Timing Role: Nonvolatile configuration register bank accessed during power-on initialization and runtime parameter updates. Use Value: 1.8V compatibility allows direct connection to 1.8V FPGA configuration I/O banks; 100-year retention ensures data integrity across equipment lifecycles. | Use Scenario: Holding door lock actuator profiles, mirror position presets, and lighting dimming curves in automotive BCMs. IC Role / Device Role / Timing Role: Dedicated EEPROM for user-customizable settings, isolated from main MCU flash to prevent corruption during OTA updates. Use Value: 1 million endurance supports frequent personalization changes; −40°C to +85°C rating meets AEC-Q100 Grade 2 requirements. |
| Medical Infusion Pump Calibration | Smart Energy Meter Firmware Parameters |
Use Scenario: Storing flow-rate calibration coefficients, alarm thresholds, and usage logs in Class II medical devices requiring traceable configuration history. IC Role / Device Role / Timing Role: Secure, tamper-resistant nonvolatile memory for FDA-mandated audit trails and device-specific calibration data. Use Value: Read-after-write verification via DO status enables deterministic validation; RoHS-compliant packaging satisfies medical regulatory requirements. | Use Scenario: Maintaining tariff schedules, metering constants, and communication protocol keys in ANSI C12.22-compliant smart meters deployed in utility grids. IC Role / Device Role / Timing Role: Isolated configuration store for metrology subsystem, independent of main application processor's flash lifecycle. Use Value: 0.4 µA standby current extends battery backup life during grid outages; 4K-bit capacity accommodates multi-tariff and security key storage. |
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, 2.5–5.5V supply, 20 MHz clock, WLCSP package | Higher density and faster interface but requires SPI controller; no ORG pin for dynamic organization | Select when migrating to SPI-based platforms with higher bandwidth needs and no legacy three-wire constraint |
| AT25DF041A-SH-B | 4-Mbit SPI DataFlash, 2.7–3.6V supply, sector-erase architecture, 8-pin SOIC | Page-oriented erase/write; lacks sequential read and ORG-selectable word size | Prefer for firmware image storage where block-level updates outweigh configuration flexibility |
Compared with M95M04-DRMN6TP/K and AT25DF041A-SH-B, the AT93C66A-10SU-1.8 provides unique hardware-selectable memory organization and true three-wire simplicity-ideal for resource-constrained MCUs lacking dedicated SPI peripherals or requiring minimal pin count.
Availability
AT93C66A-10SU-1.8 is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, medical instrumentation, and smart metering applications requiring stable component supply and long-term obsolescence management.
Supply support for AT93C66A-10SU-1.8 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 is a global semiconductor company specializing in microcontrollers, analog devices, and nonvolatile memory solutions, with a focus on embedded control and connectivity.
The AT93C66A-10SU-1.8 belongs to Microchip's legacy serial EEPROM product line, designed specifically for low-pin-count, low-power configuration storage in cost-sensitive industrial and automotive systems.
FAQ
What is the maximum clock frequency supported by the AT93C66A-10SU-1.8?
The AT93C66A-10SU-1.8 supports up to 2 MHz clock frequency at VCC = 5.0V. At lower supply voltages (1.8V–2.7V), the maximum clock rate is reduced to 0.25 MHz per AC characteristics table. This ensures reliable timing margin across its full 1.8V–5.5V operating range. The AT93C66A-10SU-1.8 datasheet specifies tSKH and tSKL minima that scale with voltage, making it essential to verify timing compliance in low-voltage designs.
How does the ORG pin affect memory organization in the AT93C66A-10SU-1.8?
The ORG pin on the AT93C66A-10SU-1.8 determines whether the 4096-bit array is interpreted as 512 words × 8 bits (ORG = low) or 256 words × 16 bits (ORG = high). An unconnected ORG pin defaults to high via internal 1 MΩ pull-up, selecting x16 mode. This hardware-selectable configuration eliminates software overhead for byte/word alignment and simplifies host driver development. The AT93C66A-10SU-1.8 retains this behavior across all valid supply voltages.
Can the AT93C66A-10SU-1.8 be used in automotive applications?
The AT93C66A-10SU-1.8 is rated for industrial temperature range (−40°C to +85°C) and carries automotive-grade variants (e.g., AT93C66AW-10SU-1.8), but the standard AT93C66A-10SU-1.8 is not AEC-Q100 qualified. For automotive body electronics, use the "W" suffix version. The AT93C66A-10SU-1.8 remains suitable for under-hood-adjacent modules with thermal derating and external protection circuits.
What is the purpose of the NC pin on the AT93C66A-10SU-1.8?
The NC (No Connect) pin on the AT93C66A-10SU-1.8 is an unbonded terminal with no internal connection. It must be left floating or tied to GND/VCC only for mechanical stability-never driven actively. This pin exists due to package standardization across the AT93CxxA family and has no electrical function. The AT93C66A-10SU-1.8 datasheet explicitly prohibits connecting NC to signal nets or using it for thermal dissipation.
Does the AT93C66A-10SU-1.8 support sequential read operations?
Yes, the AT93C66A-10SU-1.8 supports sequential read: after issuing a READ command, holding CS low causes automatic address increment and continuous data output on DO without retransmitting the instruction. Dummy bits are suppressed between words, enabling efficient burst reads. This feature reduces host CPU load and bus traffic-critical for real-time systems. The AT93C66A-10SU-1.8 implements this in both x8 and x16 modes as defined in Table 3-4.
AT93C66A-10SU-1.8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- 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:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT93C66A-10SU-1.8 FAQ
1.How can I place an order for AT93C66A-10SU-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66A-10SU-1.8 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-10SU-1.8 reliable?
The price and inventory of AT93C66A-10SU-1.8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT93C66A-10SU-1.8 is usually 5 days.
3.What payment methods are accepted for AT93C66A-10SU-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66A-10SU-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66A-10SU-1.8?
AT93C66A-10SU-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66A-10SU-1.8 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-10SU-1.8?
For technical support, including AT93C66A-10SU-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66A-10SU-1.8 requirements.
6.How does Aetrix verify that AT93C66A-10SU-1.8 is sourced from the original manufacturer or authorized distributors?
All AT93C66A-10SU-1.8 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-10SU-1.8 meets industry standards.
7.What is the process for return or replacement of AT93C66A-10SU-1.8?
All AT93C66A-10SU-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66A-10SU-1.8, 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-10SU-1.8 part is unused and in its original packaging.
Return procedure for AT93C66A-10SU-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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