My Inquiry
My Account
Microchip Technology AT93C66AW-10SI-1.8
- Part No.:
- AT93C66AW-10SI-1.8
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT93C66AW-10SI-1.8.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,274
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT93C66AW-10SI-1.8 from Microchip Technology (formerly Atmel) is a 4-kbit serial EEPROM with 3-wire interface, supporting 512 × 8 or 256 × 16 organization selectable via ORG pin, operating at 1.8V–5.5V supply, and rated for industrial temperature (−40°C to +85°C) in 8-lead JEDEC SOIC package. It delivers 2 MHz clock rate at 5V, self-timed 10 ms max write cycle, 1 million write endurance, and 100-year data retention - deployed in embedded system configuration storage and sensor calibration memory.
For engineers reviewing the AT93C66AW-10SI-1.8 datasheet, AT93C66AW-10SI-1.8 pinout, AT93C66AW-10SI-1.8 application, or AT93C66AW-10SI-1.8 equivalent, key selection considerations include low-voltage operation down to 1.8V, user-selectable x8/x16 memory mapping, sequential read capability, READY/BUSY status reporting via DO pin, and automotive-grade reliability with extended temperature support.
Technical Context
The AT93C66AW-10SI-1.8 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 organization is dynamically configured by the ORG pin: tied to VCC selects 256 × 16 mode; grounded selects 512 × 8 mode; unconnected defaults to x16 via internal 1 MΩ pull-up - though this feature is explicitly excluded on 1.8V variants per datasheet note.
Write operations require prior EWEN enable and are fully self-timed; DO outputs READY/BUSY status when CS is asserted after tCS ≥ 250 ns. AC timing supports fSK up to 2 MHz (5V), 1 MHz (2.7V), and 0.25 MHz (1.8V), with tSKH/tSKL ≥ 1000 ns at 1.8V. Standby current is as low as 0.1 µA at 1.8V, enabling ultra-low-power retention in battery-backed systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16) |
| Supply Voltage Range | 1.8V to 5.5V - enables direct interfacing with 1.8V logic and mixed-voltage systems without level shifters |
| Max Clock Frequency | 2 MHz at 5V, 1 MHz at 2.7V, 0.25 MHz at 1.8V - defines maximum serial throughput under respective voltage conditions |
| Write Cycle Time | 10 ms max (4.5–5.5V), 3 ms max (5.0V ±10%) - determines minimum time between successive write commands |
| Endurance | 1 million write cycles - supports frequent field updates in calibration or logging applications |
| Data Retention | 100 years at 25°C - ensures long-term validity of stored configuration or calibration data |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded control environments |
| Interface Protocol | 3-wire serial (CS/SK/DI/DO) with start-bit + opcode + address + data - minimal GPIO footprint for microcontroller integration |
Pinout & Package
AT93C66AW-10SI-1.8 is housed in an 8-lead JEDEC SOIC (8S1) package: 0.150" wide, 5.0 mm × 4.0 mm body, gull-wing leads, RoHS-compliant and halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must be held low during instruction transmission and data transfer; controls READY/BUSY status output timing |
| SK | Serial Clock | Synchronizes all data transfers; rising edge clocks data in/out; frequency limited by VCC (0.25–2 MHz) |
| DI | Data Input | Receives instruction opcodes, addresses, and write data; sampled on SK rising edge |
| DO | Data Output | Outputs read data, dummy bit ('0'), and READY/BUSY status; high-impedance when CS high |
| VCC | Power Supply | 1.8V–5.5V input; powers internal logic and memory array; decoupling capacitor required near pin |
| GND | Ground | Reference return path for all signals and power; must be low-impedance connection |
| ORG | Organization Select | Configures memory map: VCC = 256×16, GND = 512×8; not functional on 1.8V devices per datasheet |
| DC | Don't Connect | No internal connection; must be left floating or tied to GND/VCC per PCB layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Supports both 512×8 and 256×16 layouts via ORG pin - simplifies firmware compatibility across hardware revisions |
| Low-voltage operation | Functional down to 1.8V VCC with guaranteed 0.25 MHz clock - enables direct use in 1.8V FPGA I/O banks and ultra-low-power MCUs |
| Self-timed write cycle | No external timing control needed; DO reports BUSY/READY state - eliminates need for fixed delay loops or polling overhead |
| Sequential read mode | Continuous data stream without inter-word dummy bits - doubles effective read throughput vs. random-access reads |
| High-reliability nonvolatile storage | 1M write cycles and 100-year retention - suitable for lifetime-critical calibration storage in medical or industrial equipment |
| Automotive-grade qualification | Qualified per AEC-Q100 stress test requirements and extended temperature range - appropriate for under-hood and infotainment subsystems |
Applications
| Industrial PLC Configuration Storage | Automotive Sensor Calibration Memory |
|---|---|
Use Scenario: Storing I/O mapping, PID tuning parameters, and communication protocol settings in programmable logic controllers that undergo field reconfiguration. IC Role / Device Role / Timing Role: Nonvolatile configuration register bank accessed during boot and runtime via SPI-compatible 3-wire interface. Use Value: Enables zero-downtime parameter updates and retains settings across power loss without backup capacitors or batteries. |
Use Scenario: Holding factory-calibrated offset/gain coefficients for temperature, pressure, and position sensors in engine control units. IC Role / Device Role / Timing Role: Dedicated calibration data repository read once at startup and validated before closed-loop control activation. Use Value: Guarantees measurement accuracy over vehicle lifetime and temperature extremes, meeting ISO 26262 ASIL-B traceability requirements. |
| Medical Device Parameter Backup | Consumer Appliance User Preference Storage |
Use Scenario: Preserving therapy settings, alarm thresholds, and usage logs in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Secure, tamper-resistant memory block accessed only by authenticated firmware during initialization and maintenance mode. Use Value: Meets IEC 62304 software lifecycle requirements and supports audit-ready data integrity with 100-year retention. |
Use Scenario: Saving user-selected modes (e.g., spin speed, temperature, delay start) in washing machines and HVAC controllers across power cycles. IC Role / Device Role / Timing Role: Low-pin-count serial memory interfaced directly to 8-bit MCU GPIOs with minimal BOM impact. Use Value: Reduces system cost versus parallel EEPROMs while maintaining robustness against brown-out corruption during writes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95M02-DRMN6TP/K | 2-Mbit SPI EEPROM (vs. 4-kbit), operates 1.8V–5.5V, supports SPI Mode 0/3, no ORG pin, 5ms write cycle | Higher density for firmware patch storage; lacks user-configurable organization; requires SPI master, not 3-wire | Select when >4 kbit capacity is needed and SPI interface is already used elsewhere in design |
| BR24G04FJ-3GE2 | 4-kbit I²C EEPROM (vs. 3-wire), 1.7V–5.5V, 400 kHz max clock, 5ms write cycle, built-in write protection | Uses two-wire I²C bus; no chip select pin; requires pull-up resistors; incompatible instruction set and timing | Choose for designs with existing I²C infrastructure and where pin count allows SDA/SCL allocation |
Compared with M95M02-DRMN6TP/K and BR24G04FJ-3GE2, the AT93C66AW-10SI-1.8 offers unique 3-wire simplicity and ORG-selectable word width - critical for legacy MCU designs with limited GPIOs and variable memory access patterns - while maintaining lowest standby current (0.1 µA) among the three at 1.8V.
Availability
AT93C66AW-10SI-1.8 is available at Aetrix Electronics and suitable for industrial control, automotive electronics, medical instrumentation, and consumer appliance applications requiring stable component supply, long-lifecycle support, and guaranteed 1.8V operation.
Supply support for AT93C66AW-10SI-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 broad industrial and automotive qualification portfolios.
The AT93C66AW-10SI-1.8 belongs to Microchip's legacy AT93CxxA serial EEPROM family, designed specifically for space-constrained, low-power embedded systems needing reliable, pin-efficient configuration storage with flexible memory mapping.
FAQ
What is the function of the ORG pin on the AT93C66AW-10SI-1.8?
The ORG pin selects memory organization: tying it to VCC configures the AT93C66AW-10SI-1.8 as 256 × 16, while grounding it configures 512 × 8. However, per the official datasheet, this feature is not available on 1.8V devices like the AT93C66AW-10SI-1.8 - the part defaults to 256 × 16 regardless of ORG state. This behavior is explicitly documented in the "Note" under the Block Diagram section.
Does the AT93C66AW-10SI-1.8 support sequential read operation?
Yes, the AT93C66AW-10SI-1.8 supports sequential read: after a READ instruction, holding CS low causes automatic address increment and continuous data output on DO without inter-word dummy bits. This enables efficient bulk reads - for example, retrieving all 512 bytes of 8-bit mode in one transaction - reducing host MCU overhead and improving throughput compared to individual address reads.
What is the maximum clock frequency supported by the AT93C66AW-10SI-1.8 at 1.8V?
At VCC = 1.8V, the AT93C66AW-10SI-1.8 supports a maximum SK clock frequency of 0.25 MHz, as specified in the AC Characteristics table. This limit ensures reliable setup/hold timing margins (tDIS, tDIH ≥ 400 ns) and signal integrity under low-voltage operation. Exceeding this frequency risks read/write corruption and is not guaranteed by characterization.
How does the AT93C66AW-10SI-1.8 indicate write completion status?
The AT93C66AW-10SI-1.8 uses the DO pin to report READY/BUSY status: after initiating a WRITE cycle, if CS is brought high for ≥250 ns (tCS), DO outputs '0' during programming and transitions to '1' when complete. This allows the host MCU to poll status without fixed delays - a key advantage over EEPROMs requiring timeout-based waiting - and is valid across the full 1.8V–5.5V supply range.
Is the AT93C66AW-10SI-1.8 qualified for automotive applications?
Yes, the AT93C66AW-10SI-1.8 is explicitly designated as automotive grade in its features list and offered in extended temperature and lead-free/halogen-free variants. While the specific ordering code AT93C66AW-10SI-1.8 is rated for −40°C to +85°C (industrial), Microchip provides automotive-grade versions (e.g., AT93C66A-10SE-2.7) qualified to −40°C to +125°C and AEC-Q100 compliant - confirming the underlying design meets automotive reliability standards.
AT93C66AW-10SI-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:
- 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:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT93C66AW-10SI-1.8 FAQ
1.How can I place an order for AT93C66AW-10SI-1.8 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66AW-10SI-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-10SI-1.8 reliable?
The price and inventory of AT93C66AW-10SI-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-10SI-1.8 is usually 5 days.
3.What payment methods are accepted for AT93C66AW-10SI-1.8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66AW-10SI-1.8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66AW-10SI-1.8?
AT93C66AW-10SI-1.8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66AW-10SI-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-10SI-1.8?
For technical support, including AT93C66AW-10SI-1.8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66AW-10SI-1.8 requirements.
6.How does Aetrix verify that AT93C66AW-10SI-1.8 is sourced from the original manufacturer or authorized distributors?
All AT93C66AW-10SI-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-10SI-1.8 meets industry standards.
7.What is the process for return or replacement of AT93C66AW-10SI-1.8?
All AT93C66AW-10SI-1.8 units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66AW-10SI-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-10SI-1.8 part is unused and in its original packaging.
Return procedure for AT93C66AW-10SI-1.8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT93C66AW-10SI-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…
