Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Integrated Circuits (ICs) > Memory > Memory

Microchip Technology AT93C66A-10TI-2.7

Name: AT93C66A-10TI-2.7
Brand: Microchip Technology
SKU: AT93C66A-10TI-2.7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: AT93C66A-10TI-2.7

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 8-TSSOP (0.173", 4.40mm Width)

Datasheet:: AT93C66A-10TI-2.7.pdf

Description:: IC EEPROM 4KBIT 3-WIRE 8TSSOP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,115

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

AT93C66A-10TI-2.7 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–5.5V supply range, and automotive-grade industrial temperature operation (−40°C to +85°C) in 8-lead TSSOP package. It supports sequential read, self-timed write (≤10 ms), and high-reliability data retention (100 years) for embedded configuration storage.

For engineers reviewing the AT93C66A-10TI-2.7 datasheet, AT93C66A-10TI-2.7 pinout, AT93C66A-10TI-2.7 application, or AT93C66A-10TI-2.7 equivalent, key selection considerations include voltage compatibility (2.7V min), 3-wire SPI-like timing constraints, ORG-pin-configurable memory width, standby current at 2.7V (6–10 µA), and TSSOP-8 mechanical footprint alignment with JEDEC MO-153.

Technical Context

The AT93C66A-10TI-2.7 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. Memory access is controlled by rising-edge-triggered CS and clock-synchronized data transfer on SK edges, supporting dummy-bit-prefixed 8- or 16-bit output streams during sequential reads.

Internal organization is selected dynamically: ORG = VCC enables 256 × 16 mode; ORG = GND selects 512 × 8 mode; unconnected ORG defaults to x16 via internal 1 MΩ pull-up. The device operates without external erase cycles, uses self-timed write/erase with READY/BUSY status reporting on DO, and maintains functional integrity across −40°C to +85°C with 1 million write endurance.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	4096 bits (512 × 8 or 256 × 16 configurable)
Supply Voltage Range	2.7V to 5.5V - enables direct interface with 3.3V and 5V microcontrollers without level shifting
Max Clock Frequency	2 MHz at 5V - defines maximum serial data throughput of ~200 kbps for 8-bit transfers
Write Cycle Time	10 ms max - determines minimum time between successive WRITE commands; impacts firmware polling or timeout design
Endurance	1 million write cycles - supports frequent calibration or logging updates over product lifetime
Data Retention	100 years - ensures long-term reliability for infrequently updated configuration data
Standby Current	6.0–10.0 µA at 2.7V - critical for battery-powered systems requiring ultra-low quiescent power

Pinout & Package

AT93C66A-10TI-2.7 is housed in an 8-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, body size 3.0 mm × 4.4 mm, 0.65 mm lead pitch. Pin 1 is marked by a notch or dot; package is lead-free/halogen-free and RoHS-compliant.

Pin/Terminal	Circuit Role	Design Meaning
CS	Chip Select	Active-low enable: must be held low for entire instruction cycle; initiates command decoding on rising edge
SK	Serial Clock	Input clock synchronizing all data transfers; timing parameters (tSKH/tSKL ≥250 ns) constrain MCU SPI peripheral configuration
DI	Data Input	Serial command/address/data input; requires setup/hold times (tDIS/tDIH ≥100 ns) relative to SK edge
DO	Data Output	Tri-state serial output; reports READY/BUSY status when CS goes high mid-write; requires tPD0/tPD1 ≤1000 ns
VCC	Power Supply	2.7–5.5V main supply; decoupling capacitor (0.1 µF) required within 10 mm of pin for noise immunity
GND	Ground	Reference return path; must be low-impedance and tied directly to system ground plane
ORG	Organization Select	Configures memory width: high = 256×16, low = 512×8; open = x16 default; not functional on 1.8V variants
DC	Don't Connect	No internal connection; must be left floating or tied to GND/VCC per layout best practice - no electrical loading

Key Features

Feature	Design Value
User-selectable memory organization	Hardware-configurable 512×8 or 256×16 via ORG pin - eliminates need for software bit manipulation in host firmware
Self-timed write/erase	No external timing control needed; DO pin provides real-time READY/BUSY feedback - simplifies host polling logic
Sequential read operation	Automatic address incrementing while CS remains low - enables efficient bulk read of configuration blocks with minimal MCU overhead
Automotive-grade reliability	Rated for −40°C to +85°C, 1M write cycles, 100-year retention - validated for industrial control and automotive subsystems
Low-voltage operation	2.7V minimum supply - supports direct integration into 3.3V systems without regulator or level shifter

Applications

Industrial Sensor Calibration Storage	Automotive Body Control Module (BCM) Configuration
Use Scenario: Storing factory-calibrated offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during power-up initialization; read once per boot via 3-wire interface. Use Value: Enables field-replaceable sensor modules with unique calibration data preserved across power cycles and firmware updates.	Use Scenario: Holding user-defined lighting profiles, door lock settings, and mirror position presets in vehicle BCMs. IC Role / Device Role / Timing Role: Serial configuration EEPROM interfaced to 8-bit MCU over dedicated GPIO-controlled 3-wire bus. Use Value: Provides robust, low-power storage for infrequently written but mission-critical user preferences with guaranteed 100-year data retention.
Medical Infusion Pump Parameter Backup	Networking Equipment MAC Address Storage
Use Scenario: Preserving drug library limits, flow rate safety thresholds, and alarm hysteresis values in Class II medical devices. IC Role / Device Role / Timing Role: Safety-critical nonvolatile memory accessed only during startup or maintenance mode; write-protected via EWDS after programming. Use Value: Meets IEC 62304 requirements for data integrity with 1M endurance and deterministic write timing (≤10 ms).	Use Scenario: Storing unique Ethernet MAC addresses and PHY initialization registers in managed switches and routers. IC Role / Device Role / Timing Role: Factory-programmed serial EEPROM read during bootloader execution; accessed via bit-banged GPIO due to lack of hardware SPI. Use Value: Ensures IEEE 802.3 compliance with guaranteed uniqueness and immunity to SRAM volatility during power loss.

Industrial Sensor Calibration Storage

Automotive Body Control Module (BCM) Configuration

Use Scenario: Storing factory-calibrated offset/gain coefficients for analog sensor front-ends in programmable logic controllers.

IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during power-up initialization; read once per boot via 3-wire interface.

Use Value: Enables field-replaceable sensor modules with unique calibration data preserved across power cycles and firmware updates.

Use Scenario: Holding user-defined lighting profiles, door lock settings, and mirror position presets in vehicle BCMs.

IC Role / Device Role / Timing Role: Serial configuration EEPROM interfaced to 8-bit MCU over dedicated GPIO-controlled 3-wire bus.

Use Value: Provides robust, low-power storage for infrequently written but mission-critical user preferences with guaranteed 100-year data retention.

Medical Infusion Pump Parameter Backup

Networking Equipment MAC Address Storage

Use Scenario: Preserving drug library limits, flow rate safety thresholds, and alarm hysteresis values in Class II medical devices.

IC Role / Device Role / Timing Role: Safety-critical nonvolatile memory accessed only during startup or maintenance mode; write-protected via EWDS after programming.

Use Value: Meets IEC 62304 requirements for data integrity with 1M endurance and deterministic write timing (≤10 ms).

Use Scenario: Storing unique Ethernet MAC addresses and PHY initialization registers in managed switches and routers.

IC Role / Device Role / Timing Role: Factory-programmed serial EEPROM read during bootloader execution; accessed via bit-banged GPIO due to lack of hardware SPI.

Use Value: Ensures IEEE 802.3 compliance with guaranteed uniqueness and immunity to SRAM volatility during power loss.

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 EEPROM (vs. 4-kbit), quad I/O capable, 1.8–5.5V, 20 MHz max clock	Higher density and speed; requires SPI hardware support; larger footprint (8-lead SOIC vs. TSSOP)	Select when >4 kbit capacity or faster throughput is required; verify PCB pad compatibility with SOIC-8
25AA040A-I/MS	4-kbit SPI EEPROM, 1.8–5.5V, 10 MHz max clock, 8-lead MSOP package (3×4.9 mm)	Near-identical capacity/voltage; SPI protocol differs (no ORG pin; fixed 512×8); MSOP slightly wider than TSSOP	Drop-in alternative if ORG flexibility is unnecessary and MSOP footprint is acceptable; same write timing (10 ms)

Compared with M95M04-DRMN6TP/K and 25AA040A-I/MS, the AT93C66A-10TI-2.7 offers unique ORG-pin-configurable word width and lower pin-count 3-wire interface - advantageous for resource-constrained MCUs lacking SPI peripherals or requiring flexible data-width handling in legacy designs.

Availability

AT93C66A-10TI-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive BCM configuration, medical device parameter backup, and networking equipment MAC address storage requiring stable component supply across extended product lifecycles.

Supply support for AT93C66A-10TI-2.7 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 delivering microcontrollers, analog, FPGA, and memory solutions with emphasis on reliability, longevity, and embedded system integration.

The AT93C66A belongs to Microchip's legacy serial EEPROM product line, designed specifically for cost-sensitive, low-pin-count embedded systems needing simple, robust nonvolatile storage with minimal MCU resource usage.

FAQ

What is the function of the ORG pin on the AT93C66A-10TI-2.7?

The ORG pin on the AT93C66A-10TI-2.7 selects internal memory organization: tied to VCC enables 256 × 16 mode; tied to GND selects 512 × 8 mode; left unconnected defaults to x16 via internal 1 MΩ pull-up. This hardware-selectable width eliminates firmware bit-packing and simplifies host interface design. The AT93C66A-10TI-2.7 does not support ORG functionality in 1.8V variants, but this part is a 2.7V version so ORG is fully operational.

Does the AT93C66A-10TI-2.7 require an external erase cycle before writing?

No, the AT93C66A-10TI-2.7 performs self-timed erase internally during the WRITE or ERASE instruction - no separate erase command or cycle is needed. The device automatically erases the target location before programming new data, and the DO pin outputs READY/BUSY status if CS is raised after tCS (≥250 ns). This simplifies firmware implementation compared to parallel EEPROMs. The AT93C66A-10TI-2.7 guarantees full write completion within 10 ms at 4.5–5.5V.

What is the maximum clock frequency supported by the AT93C66A-10TI-2.7 at 2.7V supply?

At VCC = 2.7V to 5.5V, the AT93C66A-10TI-2.7 supports a maximum SK clock frequency of 1 MHz (per AC Characteristics table, fSK Min/Max = 0/1 MHz for 2.7V ≤ VCC ≤ 5.5V). This is lower than its 2 MHz rating at 5V, reflecting voltage-dependent timing margins. Designers must configure MCU GPIO toggle rates or SPI bitrates accordingly. The AT93C66A-10TI-2.7 maintains full functionality across this range without derating other parameters.

Can the AT93C66A-10TI-2.7 be used in automotive applications?

Yes, the AT93C66A-10TI-2.7 is qualified for automotive-grade industrial temperature operation (−40°C to +85°C) and offered in lead-free/halogen-free packaging. Its 1 million write endurance, 100-year data retention, and robust ESD tolerance (per Atmel qualification standards) meet requirements for body electronics, infotainment configuration, and powertrain subsystems. The AT93C66A-10TI-2.7 is explicitly listed in Atmel documentation as "Automotive Grade, Extended Temperature" - confirming suitability beyond commercial-grade use cases.

How is write protection implemented on the AT93C66A-10TI-2.7?

Write protection on the AT93C66A-10TI-2.7 is enforced through instruction-level enable/disable: the device powers up in Erase/Write Disable (EWDS) state, and an EWEN instruction must be issued before any WRITE or ERASE command executes. After programming, EWDS restores protection. There is no hardware write-protect pin; security relies entirely on correct instruction sequencing. The AT93C66A-10TI-2.7 also supports WRAL/ERAL only at 4.5–5.5V, adding voltage-based safeguard against accidental bulk operations.

AT93C66A-10TI-2.7 Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-TSSOP (0.173", 4.40mm 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:: 2.7V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-TSSOP

AT93C66A-10TI-2.7 FAQ

1.How can I place an order for AT93C66A-10TI-2.7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AT93C66A-10TI-2.7 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-10TI-2.7 reliable?

The price and inventory of AT93C66A-10TI-2.7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT93C66A-10TI-2.7 is usually 5 days.

3.What payment methods are accepted for AT93C66A-10TI-2.7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66A-10TI-2.7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AT93C66A-10TI-2.7?

AT93C66A-10TI-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AT93C66A-10TI-2.7 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-10TI-2.7?

For technical support, including AT93C66A-10TI-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66A-10TI-2.7 requirements.

6.How does Aetrix verify that AT93C66A-10TI-2.7 is sourced from the original manufacturer or authorized distributors?

All AT93C66A-10TI-2.7 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-10TI-2.7 meets industry standards.

7.What is the process for return or replacement of AT93C66A-10TI-2.7?

All AT93C66A-10TI-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66A-10TI-2.7, 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-10TI-2.7 part is unused and in its original packaging.

Return procedure for AT93C66A-10TI-2.7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…