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Microchip Technology AT93C66A-10TU-2.7-T
- Part No.:
- AT93C66A-10TU-2.7-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT93C66A-10TU-2.7-T.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,149
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Product details
Overview
AT93C66A-10TU-2.7-T from Microchip Technology (formerly Atmel) is a 4-kbit serial EEPROM with three-wire interface, supporting 512 × 8 or 256 × 16 organization selectable via ORG pin, 2.7–5.5 V operation, and 2 MHz clock rate at 5 V. It delivers 1 million write cycles and 100-year data retention for nonvolatile configuration storage in industrial control modules.
For engineers reviewing the AT93C66A-10TU-2.7-T datasheet, AT93C66A-10TU-2.7-T pinout, AT93C66A-10TU-2.7-T application, or AT93C66A-10TU-2.7-T equivalent, key selection criteria include low-voltage compatibility (2.7 V min), self-timed write cycle (≤10 ms), TSSOP-8 packaging, and support for sequential read and dual-word-width addressing.
Technical Context
The AT93C66A-10TU-2.7-T implements a synchronous three-wire serial interface (CS/SK/DI/DO) with instruction-based command set including READ, WRITE, ERASE, EWEN, and EWDS. Its internal logic decodes 9-bit addresses for 4K-bit memory and supports automatic address increment during sequential reads.
Operation requires Erase/Write Enable (EWEN) before programming; subsequent EWDS disables all write functions. The ORG pin selects x8 or x16 word width, and DO outputs Ready/Busy status during write cycles when CS is reasserted after tCS ≥250 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16 words), enabling compact firmware parameter storage |
| Supply Voltage Range | 2.7 V to 5.5 V - compatible with 3.3 V and 5 V systems without level shifting |
| Max Clock Frequency | 2 MHz at VCC = 5 V - supports fast configuration loading in real-time embedded systems |
| Write Cycle Time | ≤10 ms - enables deterministic timeout handling in host firmware |
| Endurance | 1 million write cycles - suitable for frequent calibration or logging applications |
| Data Retention | 100 years at 25 °C - ensures long-term reliability in unattended equipment |
| Operating Temperature | −40 °C to +85 °C - qualified for industrial ambient environments |
Pinout & Package
AT93C66A-10TU-2.7-T is housed in an 8-lead Thin Shrink Small Outline Package (TSSOP) with 0.65 mm pitch, 3.0 mm body width, and 4.4 mm body length - optimized for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must be held low for entire instruction sequence; controls DO tri-state behavior |
| SK | Serial Clock | Synchronizes all data transfers; rising edge samples DI, falling edge outputs DO |
| DI | Data Input | Receives start bit, opcode, address, and write data; latched on SK rising edge |
| DO | Data Output | Outputs read data or Ready/Busy status; high-impedance when CS is high |
| VCC | Power Supply | 2.7–5.5 V supply; powers internal logic and charge pump for write operations |
| GND | Ground | Reference for all I/O and internal circuitry; must be low-impedance return path |
| ORG | Organization Select | High = 256 × 16 mode; low = 512 × 8 mode; unconnected defaults to x16 via internal 1 MΩ pull-up |
| NC | No Connect | Internally unused; must remain floating or tied to GND/VCC per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | x8 or x16 word width via ORG pin - simplifies firmware adaptation across memory map variants |
| Self-timed write cycle | No external timing control needed - reduces host CPU overhead and eliminates need for write-cycle polling delays |
| Three-wire serial interface | Minimal GPIO usage (3 pins) - ideal for microcontrollers with limited I/O resources |
| Sequential read operation | Continuous data stream without repeated address commands - improves boot-time configuration load speed |
| Low standby current | 6 µA typical at 2.7 V - extends battery life in always-on sensor nodes |
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. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed during power-up initialization and runtime reconfiguration. Use Value: Ensures deterministic system state restoration after brownout or cold start without external backup power. | Use Scenario: Holding door lock actuator profiles, mirror position presets, and lighting dimming curves in vehicle BCMs. IC Role / Device Role / Timing Role: Persistent configuration memory interfaced directly to 8-bit MCU over minimal GPIOs. Use Value: Enables user-customizable features while meeting AEC-Q100 Class 2 temperature requirements (−40 °C to +105 °C). |
| Medical Infusion Pump Calibration Data | Smart Energy Meter Firmware Parameters |
Use Scenario: Storing flow-rate calibration coefficients, alarm thresholds, and maintenance counters in Class II medical devices. IC Role / Device Role / Timing Role: Tamper-resistant, long-retention memory for safety-critical operational constants. Use Value: Meets IEC 62304 software lifecycle requirements with 100-year data retention and 1M endurance. | Use Scenario: Saving tariff schedules, metering calibration factors, and communication module settings in ANSI C12.20-compliant meters. IC Role / Device Role / Timing Role: Secure, low-power configuration storage accessible during meter wake-up from deep sleep. Use Value: Supports 10+ year field deployment with guaranteed data integrity under thermal cycling and voltage variation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT93C66B-10TU-2.7-T | Successor device with enhanced ESD rating (4 kV HBM), same pinout and instruction set | Recommended for new designs; identical footprint but improved robustness in noisy industrial environments | Select when designing for production release post-2012; not drop-in for legacy qualification testing |
| M95M04-DRMN6TP/K | 4-Mbit SPI EEPROM (vs. 4-kbit microwire); 10 MHz max clock; different command protocol | Higher density and faster interface, but requires SPI peripheral and revised driver stack | Choose only if migrating to SPI architecture and needing >10× capacity increase |
Compared with AT93C66B-10TU-2.7-T, the AT93C66A-10TU-2.7-T lacks updated ESD hardening but retains full functional equivalence for existing designs; versus M95M04-DRMN6TP/K, it offers simpler interface and lower power but significantly less memory - making it optimal for space-constrained, cost-sensitive 4-kbit use cases.
Availability
AT93C66A-10TU-2.7-T is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, medical infusion pumps, and smart energy meters requiring stable component supply across extended product lifecycles.
Supply support for AT93C66A-10TU-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 is a global semiconductor company specializing in microcontrollers, analog devices, and nonvolatile memory solutions for industrial, automotive, and consumer markets.
The AT93C66A-10TU-2.7-T belongs to Microchip's legacy serial EEPROM product line, designed specifically for low-pin-count, low-power configuration storage in resource-constrained embedded systems.
FAQ
What is the maximum clock frequency supported by the AT93C66A-10TU-2.7-T?
The AT93C66A-10TU-2.7-T supports up to 2 MHz clock frequency at VCC = 5.0 V. At 2.7 V, the maximum clock rate drops to 1 MHz, and at 1.8 V (not applicable to this -2.7 variant), it is 0.25 MHz. These values are specified in Table 3-3 of the datasheet and reflect guaranteed AC timing performance across temperature and voltage ranges.
How does the ORG pin affect memory organization in the AT93C66A-10TU-2.7-T?
The ORG pin on the AT93C66A-10TU-2.7-T selects between two internal configurations: when tied to VCC, it enables 256 × 16-bit organization; when grounded, it configures 512 × 8-bit mode. If left unconnected, the internal 1 MΩ pull-up defaults to x16 mode. This setting determines address width and data word size used during READ and WRITE operations.
Is the AT93C66A-10TU-2.7-T RoHS compliant and lead-free?
Yes, the AT93C66A-10TU-2.7-T is RoHS compliant and lead-free. The "U" suffix in the ordering code explicitly denotes Green package + RoHS compliance per the manufacturer's ordering information table (Section 7). It meets JEDEC J-STD-020 moisture sensitivity level 1 and is compatible with standard Pb-free reflow profiles.
Does the AT93C66A-10TU-2.7-T require an external erase cycle before writing?
No, the AT93C66A-10TU-2.7-T 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 (erase + program) is self-timed, completing within 10 ms maximum. Erase-only commands (ERASE, ERAL) are optional and used only for selective or bulk clearing.
What is the function of the NC pin on the AT93C66A-10TU-2.7-T?
Pin 2 of the AT93C66A-10TU-2.7-T is labeled NC (No Connect) and is internally unused. It must not be connected to any signal or power rail. Per datasheet guidance, it may be left floating or tied to GND/VCC solely for mechanical stability - but no electrical function is assigned, and connecting it incorrectly risks compromising package integrity or thermal performance.
AT93C66A-10TU-2.7-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm 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-TSSOP
AT93C66A-10TU-2.7-T FAQ
1.How can I place an order for AT93C66A-10TU-2.7-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66A-10TU-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-10TU-2.7-T reliable?
The price and inventory of AT93C66A-10TU-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-10TU-2.7-T is usually 5 days.
3.What payment methods are accepted for AT93C66A-10TU-2.7-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66A-10TU-2.7-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66A-10TU-2.7-T?
AT93C66A-10TU-2.7-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66A-10TU-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-10TU-2.7-T?
For technical support, including AT93C66A-10TU-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-10TU-2.7-T requirements.
6.How does Aetrix verify that AT93C66A-10TU-2.7-T is sourced from the original manufacturer or authorized distributors?
All AT93C66A-10TU-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-10TU-2.7-T meets industry standards.
7.What is the process for return or replacement of AT93C66A-10TU-2.7-T?
All AT93C66A-10TU-2.7-T units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66A-10TU-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-10TU-2.7-T part is unused and in its original packaging.
Return procedure for AT93C66A-10TU-2.7-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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