My Inquiry
My Account
Microchip Technology AT93C66AW-10SU-1.8
- Part No.:
- AT93C66AW-10SU-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT93C66AW-10SU-1.8.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,011
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT93C66AW-10SU-1.8 from Microchip Technology (formerly Atmel) is a 4-kbit three-wire serial EEPROM with user-selectable 512 × 8 or 256 × 16 organization, 1.8 V to 5.5 V supply operation, 2 MHz max clock rate at 5 V, self-timed write cycle ≤10 ms, and 1 million write endurance. It serves as nonvolatile configuration storage in industrial control modules requiring low-voltage compatibility and space-constrained PCB layouts.
For engineers reviewing the AT93C66AW-10SU-1.8 datasheet, AT93C66AW-10SU-1.8 pinout, AT93C66AW-10SU-1.8 application, or AT93C66AW-10SU-1.8 equivalent, this page delivers verified electrical specs, package mapping to 8-lead SOIC, functional pin roles, automotive-grade reliability data, and real-world use context for rapid BOM validation and design-in.
Technical Context
The AT93C66AW-10SU-1.8 implements a synchronous three-wire interface (CS/SK/DI/DO) with instruction-based command set including READ, WRITE, ERASE, EWEN, EWDS, ERAL, and WRAL. Its ORG pin selects between x8 and x16 memory organization, and CS-driven Ready/Busy status reporting enables host synchronization without polling overhead.
It supports sequential read mode with automatic address increment and dummy-bit suppression between words, reducing host firmware complexity. Write operations require prior EWEN activation and are self-timed - no external timing control or erase-before-write sequence is needed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16), enabling compact storage of calibration tables or device IDs in resource-limited microcontrollers. |
| Supply Voltage Range | 1.8 V to 5.5 V - supports direct interfacing with 1.8 V logic families and legacy 3.3 V/5 V systems without level shifters. |
| Max Clock Frequency | 2 MHz at VCC = 5 V - allows fast configuration reads during boot-up while maintaining timing margin at lower voltages. |
| Write Cycle Time | ≤10 ms - defines worst-case latency for firmware updates; enables deterministic timeout handling in safety-critical applications. |
| Endurance | 1 million write cycles - ensures reliable field reprogramming over 10+ years in industrial logging or parameter tuning use cases. |
| Data Retention | 100 years at +25 °C - guarantees long-term integrity of stored calibration coefficients or security keys without refresh. |
| Operating Temperature | −40 °C to +85 °C - qualified for industrial ambient environments, including motor drives and sensor nodes. |
Pinout & Package
AT93C66AW-10SU-1.8 is packaged in an 8-lead JEDEC SOIC (8S1), 0.150" wide body, RoHS-compliant, green plastic gull-wing outline measuring 4.80–5.00 mm × 5.79–6.20 mm × 1.35–1.75 mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must be held low for entire instruction frame; rising edge initiates command recognition. |
| SK | Serial Clock | Synchronous input controlling bit timing; rising edge samples DI and shifts DO; tSKH/tSKL ≥250 ns at 1.8 V. |
| DI | Data Input | Serial command/data input; accepts Start Bit (1), Op Code, address, and data; VIH/VIL thresholds scale with VCC. |
| DO | Data Output | Open-drain output delivering read data or Ready/Busy status; requires external pull-up; VOL ≤0.2 V at 0.15 mA. |
| GND | Ground Reference | Return path for VCC and all I/O; must be low-impedance to minimize noise coupling into sensitive serial timing. |
| VCC | Power Supply | Single-supply input supporting 1.8–5.5 V; ICC ≤2.0 mA during active read/write; ISB ≤1.0 µA in standby (1.8 V). |
| ORG | Organization Select | Logic-high = x16 mode (256 words); logic-low = x8 mode (512 words); unconnected defaults to x16 via internal 1 MΩ pull-up. |
| NC | No Connect | Internally unused pin; must remain floating or tied to GND/VCC per layout best practice - no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configurable x8/x16 word width via ORG pin, eliminating need for firmware adaptation across memory map variants. |
| Three-wire serial interface | Minimal GPIO footprint (3 signal lines + CS) reduces MCU pin count and simplifies routing on dense PCBs. |
| Self-timed write cycle | No external timing circuitry or software delay loops required - host can issue next command after tWP completion or poll DO status. |
| Sequential read mode | Continuous multi-word reads without reissuing addresses, cutting firmware overhead and improving boot-time configuration load speed. |
| Ready/Busy status reporting | DO pin outputs logic '0' during write/erase, '1' when complete - enables efficient host synchronization without fixed delays. |
Applications
| Industrial PLC Configuration Storage | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Storing calibrated sensor offsets, I/O mapping tables, and firmware revision flags in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during cold start and runtime parameter updates via SPI-compatible host MCU. Use Value: Enables field-upgradable calibration without hardware redesign; 1.8 V operation allows direct connection to low-power ARM Cortex-M0+ MCUs. | Use Scenario: Holding door lock actuator profiles, lighting dimming curves, and seat position presets in automotive BCMs operating across battery voltage swings (9–16 V). IC Role / Device Role / Timing Role: Standby-power-optimized EEPROM providing persistent settings accessible during ignition-on initialization and sleep-mode wake events. Use Value: 1 µA standby current at 1.8 V extends battery life in always-on modules; −40 °C to +85 °C rating meets AEC-Q100 Grade 3 requirements. |
| Medical Infusion Pump Calibration | Smart Energy Meter Firmware Patch Storage |
Use Scenario: Securing dose-rate lookup tables and motor calibration constants in Class II medical devices requiring traceable, tamper-resistant parameter storage. IC Role / Device Role / Timing Role: Safety-critical nonvolatile memory with 100-year data retention, accessed only during authorized service mode via authenticated host commands. Use Value: Eliminates need for external backup capacitors or supercapacitors; high endurance supports frequent recalibration during device servicing. | Use Scenario: Storing firmware patch binaries and cryptographic keys for secure OTA updates in utility-grade smart meters deployed in outdoor enclosures. IC Role / Device Role / Timing Role: Secure, low-power configuration vault interfaced to metering SoC's serial peripheral; write-protection enforced via EWDS instruction. Use Value: 1 million write cycles support >10 years of quarterly firmware patches; RoHS-compliant green package meets global environmental compliance mandates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT93C66B-10SU-1.8 | Successor device with enhanced ESD robustness (4 kV HBM), updated process node, and same pinout/package. | Identical functionality and timing; recommended for new designs per Microchip documentation. | Select when long-term supply continuity and latest qualification data are priorities; not drop-in if legacy qualification reports are mandated. |
| M95M04-DWDW3TP/K | 4-Mbit SPI EEPROM (quad I/O capable), 1.8 V min, but uses four-wire SPI vs. three-wire Microwire; different instruction set and status register model. | Higher density and faster throughput, but requires SPI controller support and firmware rewrite. | Choose for bandwidth-sensitive applications where MCU has dedicated SPI hardware and layout allows extra signal routing. |
Compared with AT93C66AW-10SU-1.8, the AT93C66B-10SU-1.8 offers improved manufacturing consistency and ESD immunity while preserving full electrical and mechanical compatibility, whereas the M95M04-DWDW3TP/K trades interface simplicity for higher density and speed at the cost of firmware porting effort.
Availability
AT93C66AW-10SU-1.8 is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, medical device calibration storage, and smart meter firmware patching requiring stable component supply and long-term lifecycle assurance.
Supply support for AT93C66AW-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 components, and nonvolatile memory solutions, with broad industrial and automotive qualification portfolios.
The AT93C66AW-10SU-1.8 belongs to Microchip's legacy serial EEPROM product line, designed specifically for low-pin-count, low-power, and space-constrained embedded systems requiring reliable, byte-level rewritable nonvolatile storage.
FAQ
What is the memory organization flexibility of the AT93C66AW-10SU-1.8?
The AT93C66AW-10SU-1.8 supports user-selectable 512 × 8 or 256 × 16 organization via its ORG pin: tied to VCC for x16 mode (256 words), grounded for x8 mode (512 words), or left unconnected to default to x16 using the internal 1 MΩ pull-up. This eliminates firmware changes when adapting to different data-width requirements across product variants.
Does the AT93C66AW-10SU-1.8 require an external erase cycle before writing?
No, the AT93C66AW-10SU-1.8 does not require a separate erase cycle before writing. Each WRITE instruction performs both erase and program operations automatically within the self-timed tWP cycle (≤10 ms). The device enters Erase/Write Enable state only after explicit EWEN instruction, ensuring data integrity against accidental writes.
How does the AT93C66AW-10SU-1.8 indicate write completion to the host?
The AT93C66AW-10SU-1.8 uses its DO pin to signal Ready/Busy status: when CS is brought high after initiating a write, DO outputs logic '0' while programming is in progress and transitions to logic '1' upon completion. This allows the host to synchronize without fixed delays - critical for deterministic real-time response in industrial firmware.
What package type is used by the AT93C66AW-10SU-1.8?
The AT93C66AW-10SU-1.8 uses an 8-lead JEDEC SOIC (8S1) package: 0.150" wide body, gull-wing leads, RoHS-compliant green plastic, with dimensions 4.80–5.00 mm × 5.79–6.20 mm × 1.35–1.75 mm. Pin 1 is marked by a notch or beveled corner per JEDEC MS-012 standard.
Is the AT93C66AW-10SU-1.8 suitable for automotive applications?
Yes, the AT93C66AW-10SU-1.8 is explicitly offered in automotive-grade versions per the datasheet, with operating temperature range −40 °C to +85 °C and qualification for industrial and automotive environments. However, it is not AEC-Q200 qualified out-of-box - system-level validation is required for safety-critical automotive functions.
AT93C66AW-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
AT93C66AW-10SU-1.8 FAQ
1.How can I place an order for AT93C66AW-10SU-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66AW-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 AT93C66AW-10SU-1.8 reliable?
The price and inventory of AT93C66AW-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 AT93C66AW-10SU-1.8 is usually 5 days.
3.What payment methods are accepted for AT93C66AW-10SU-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66AW-10SU-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66AW-10SU-1.8?
AT93C66AW-10SU-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66AW-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 AT93C66AW-10SU-1.8?
For technical support, including AT93C66AW-10SU-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66AW-10SU-1.8 requirements.
6.How does Aetrix verify that AT93C66AW-10SU-1.8 is sourced from the original manufacturer or authorized distributors?
All AT93C66AW-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 AT93C66AW-10SU-1.8 meets industry standards.
7.What is the process for return or replacement of AT93C66AW-10SU-1.8?
All AT93C66AW-10SU-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66AW-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 AT93C66AW-10SU-1.8 part is unused and in its original packaging.
Return procedure for AT93C66AW-10SU-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT93C66AW-10SU-1.8 Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
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.
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.
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…
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…
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…
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 …
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…
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…
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…
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…
