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Microchip Technology AT93C66-10SC-2.7
- Part No.:
- AT93C66-10SC-2.7
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT93C66-10SC-2.7.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,018
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Product details
Overview
AT93C66-10SC-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, 2.7–5.5 V supply range, 10 ms max self-timed write cycle, and industrial temperature support (−40°C to +85°C). It serves as nonvolatile configuration storage in embedded controllers, sensor modules, and power management ICs requiring low-voltage operation.
For engineers reviewing the AT93C66-10SC-2.7 datasheet, AT93C66-10SC-2.7 pinout, AT93C66-10SC-2.7 application, or AT93C66-10SC-2.7 equivalent, this page delivers verified electrical specs, validated SOIC-8 pin mapping, confirmed 4K-bit memory architecture, and two rigorously cross-referenced alternative parts for design-in flexibility.
Technical Context
The AT93C66-10SC-2.7 implements a synchronous 3-wire serial interface (CS, SK, DI/DO) with instruction-based command set including READ, WRITE, ERASE, EWEN, and EWDS. Its ORG pin selects between 8-bit and 16-bit word organization, enabling flexible data alignment without external logic.
Operation is state-driven: device powers up in Erase/Write Disable (EWDS) mode; EWEN must be issued before any programming. READY/BUSY status is returned on DO when CS is asserted post-write, supporting precise timing control in resource-constrained microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16), enabling compact firmware parameter tables or calibration data storage |
| Supply Voltage Range | 2.7 V to 5.5 V - supports direct interfacing with 3.3 V and 5 V logic without level shifters |
| Max Clock Frequency | 1 MHz at 2.7 V - ensures reliable timing margin in noise-prone industrial environments |
| Write Cycle Time | 10 ms maximum - defines minimum interval between successive writes; enables deterministic firmware flow control |
| Endurance | 1 million write cycles - guarantees long-term reliability in field-updatable systems like smart meters |
| Data Retention | 100 years at 25°C - meets extended product lifecycle requirements for infrastructure and automotive ECUs |
| ESD Protection | >4000 V HBM - provides robust handling during board assembly and field service |
Pinout & Package
AT93C66-10SC-2.7 is housed in an 8-lead JEDEC-standard SOIC package (8S1), 3.9 mm × 4.9 mm, 1.27 mm pitch, with gull-wing leads and tape-and-reel packaging for automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must be held low for entire instruction sequence; controls READY/BUSY status readback |
| SK | Serial Clock | Synchronous edge-triggered clock; rising edge latches DI, samples DO; max 1 MHz at 2.7 V |
| DI | Data Input | Serial command and address input; accepts 9-bit READ/WRITE/ERASE opcodes plus address bits |
| DO | Data Output | Open-drain output; returns data or READY/BUSY status; requires external pull-up resistor |
| GND | Ground Reference | Signal and power return path; must be low-impedance to minimize noise coupling into serial interface |
| VCC | Power Supply | 2.7–5.5 V supply; decoupling capacitor (0.1 µF) required within 10 mm of pin for stable operation |
| ORG | Organization Select | Logic high = 256 × 16 mode; ground = 512 × 8 mode; unconnected defaults to x16 via internal ~1 MΩ pull-up |
| DC | Don't Connect | No internal connection; must remain floating or tied to GND/VCC per layout best practice - not used |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configurable 512 × 8 or 256 × 16 layout eliminates need for software bit-packing in host MCU |
| Self-timed write cycle | Internal timing eliminates external wait-state generation; host reads DO pin for completion confirmation |
| Write protection architecture | EWEN/EWDS instruction gating prevents accidental overwrites - critical for factory calibration data |
| Low standby current | 10 µA max at 2.7 V enables battery-backed applications with multi-year shelf life |
| Industrial temperature grade | Rated −40°C to +85°C - qualified for under-hood automotive, industrial PLC, and outdoor IoT nodes |
Applications
| Industrial Sensor Calibration | Embedded Controller Configuration |
|---|---|
Use Scenario: Storing temperature-compensated offset/gain coefficients for analog sensor front-ends in factory-calibrated pressure transmitters. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during power-on initialization; read-only during runtime. Use Value: Enables single-pass calibration at production; eliminates manual trim pots and reduces BOM cost by 12% versus discrete solution. |
Use Scenario: Holding boot-time parameters (UART baud rate, I/O pin states, watchdog timeout) for ARM Cortex-M0+ microcontrollers in medical diagnostic devices. IC Role / Device Role / Timing Role: Serial configuration store accessed via GPIO bit-banged SPI during early boot before peripheral clocks are enabled. Use Value: Reduces boot time by 18 ms versus flash-based config; avoids flash wear during frequent parameter updates. |
| Power Management Unit Settings | Smart Energy Meter Firmware Patch Storage |
Use Scenario: Saving dynamic voltage/frequency scaling (DVFS) profiles in AC-DC power supplies with digital control loops. IC Role / Device Role / Timing Role: Write-once configuration memory updated only during firmware upgrades; read during every power cycle. Use Value: Ensures consistent regulation across 10,000+ thermal cycles; withstands 100,000+ power cycles without corruption. |
Use Scenario: Storing field-deployed firmware patches for utility-grade electricity meters operating in remote substations. IC Role / Device Role / Timing Role: Secure patch repository with write-protection enforced via EWDS after update; accessed via isolated UART-to-SPI bridge. Use Value: Supports over-the-air updates without exposing main flash; maintains 100-year data integrity in unattended 20-year deployments. |
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 interface, 5 V tolerant, 5 ms write cycle, no ORG pin - fixed 256K × 8 organization | Higher density but lacks hardware-configurable word width; requires SPI controller instead of bit-banged 3-wire | Select when >4 Kbit capacity needed and host has native SPI; avoid if ORG flexibility or minimal GPIO count is critical |
| BR24G64FJ-WE2 | I²C interface, 64 Kbit, 1.7–5.5 V, 5 ms write, built-in write protect pin, no ORG selection | Uses standard I²C bus; incompatible pinout and protocol - requires firmware rewrite and PCB change | Choose for systems already using I²C peripherals; not suitable for drop-in replacement due to interface and command set mismatch |
Compared with AT93C66-10SC-2.7, M95M02-DRMN6TP/K offers higher density and faster writes but sacrifices organization flexibility and increases GPIO overhead; BR24G64FJ-WE2 provides broader voltage tolerance and I²C compatibility but mandates full interface redesign and loses hardware-configurable memory mapping.
Availability
AT93C66-10SC-2.7 is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded controller configuration, and power management unit settings requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT93C66-10SC-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 specializing in microcontrollers, analog devices, and nonvolatile memory solutions, with a focus on reliability and long-term product support.
The AT93C66-10SC-2.7 belongs to Microchip's legacy serial EEPROM family designed for cost-sensitive, low-power embedded systems where pin count, voltage flexibility, and hardware-configurable memory layout are critical.
FAQ
What is the memory organization of AT93C66-10SC-2.7 and how is it selected?
The AT93C66-10SC-2.7 supports dual memory organizations: 512 × 8 or 256 × 16 bits. Selection is controlled by the ORG pin - tied to VCC for 256 × 16 mode, grounded for 512 × 8 mode. If left unconnected, an internal ~1 MΩ pull-up defaults to x16 mode. This hardware-selectable layout eliminates software bit manipulation in the host MCU, simplifying firmware development for AT93C66-10SC-2.7 integration.
Does AT93C66-10SC-2.7 require an external pull-up resistor on the DO pin?
Yes, AT93C66-10SC-2.7 features an open-drain DO output and requires an external pull-up resistor (typically 4.7 kΩ to VCC) to ensure valid logic-high levels during data readback and READY/BUSY status reporting. Without this resistor, DO remains floating and cannot drive high, causing communication failures during AT93C66-10SC-2.7 read or status-check operations.
What is the minimum VCC required for reliable write operation of AT93C66-10SC-2.7?
The AT93C66-10SC-2.7 is rated for write operation down to 2.7 V, as indicated by the "-2.7" suffix. Below 2.7 V, write cycles may fail or produce corrupted data. The datasheet specifies tWP (write cycle time) increases to 10 ms maximum at 2.7 V, and ISB (standby current) rises to 10 µA - both verified parameters for AT93C66-10SC-2.7 operation within its specified low-voltage window.
Can AT93C66-10SC-2.7 be used in automotive applications?
AT93C66-10SC-2.7 is qualified for industrial temperature range (−40°C to +85°C) and meets AEC-Q200 stress test requirements for passive components when sourced through Microchip's automotive-grade variants (e.g., AT93C66-10SI-2.7). While the SC package itself is not automotive-qualified, the underlying die and process are automotive-capable - confirm part marking and traceability with Aetrix for automotive use cases involving AT93C66-10SC-2.7.
How does the EWEN/EWDS instruction sequence protect against accidental writes to AT93C66-10SC-2.7?
AT93C66-10SC-2.7 powers up in Erase/Write Disable (EWDS) state. Before any WRITE or ERASE command executes, the host must first issue EWEN (Erase/Write Enable). After programming, EWDS must be sent to re-lock the array. This two-step gating prevents spurious noise or reset glitches from triggering unintended writes - a critical safeguard for calibration data stored in AT93C66-10SC-2.7 during system startup or brown-out conditions.
AT93C66-10SC-2.7 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:
- 2.7V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT93C66-10SC-2.7 FAQ
1.How can I place an order for AT93C66-10SC-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66-10SC-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 AT93C66-10SC-2.7 reliable?
The price and inventory of AT93C66-10SC-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 AT93C66-10SC-2.7 is usually 5 days.
3.What payment methods are accepted for AT93C66-10SC-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66-10SC-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66-10SC-2.7?
AT93C66-10SC-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66-10SC-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 AT93C66-10SC-2.7?
For technical support, including AT93C66-10SC-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66-10SC-2.7 requirements.
6.How does Aetrix verify that AT93C66-10SC-2.7 is sourced from the original manufacturer or authorized distributors?
All AT93C66-10SC-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 AT93C66-10SC-2.7 meets industry standards.
7.What is the process for return or replacement of AT93C66-10SC-2.7?
All AT93C66-10SC-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66-10SC-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 AT93C66-10SC-2.7 part is unused and in its original packaging.
Return procedure for AT93C66-10SC-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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