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Microchip Technology AT93C66-10SC
- Part No.:
- AT93C66-10SC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT93C66-10SC.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,605
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Product details
Overview
AT93C66-10SC from Microchip Technology (formerly Atmel) is a 4-kbit serial EEPROM with 3-wire interface, user-selectable 512 × 8 or 256 × 16 organization, 2.7V–5.5V supply range, 10 ms max write cycle time, and industrial temperature rating (−40°C to +85°C). It serves as nonvolatile configuration storage in embedded controllers, power management units, and sensor calibration modules.
For engineers reviewing the AT93C66-10SC datasheet, AT93C66-10SC pinout, AT93C66-10SC application, or AT93C66-10SC equivalent, key selection factors include voltage compatibility (2.7V min), self-timed write endurance (1M cycles), SOIC-8 packaging, and ORG-pin configurable memory width - critical for legacy system upgrades and space-constrained PCBs.
Technical Context
The AT93C66-10SC implements a synchronous 3-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 (A8–A0) for 4K-bit capacity and supports dual-word-width access via the ORG pin.
Write operations require explicit Erase/Write Enable (EWEN) before programming; status feedback is provided via DO pin during CS high after tCS ≥ 250 ns. The device uses no external erase cycle and maintains data integrity through automatic EWDS on power-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16 organization) |
| Supply Voltage Range | 2.7V to 5.5V - enables direct interfacing with 3.3V and 5V microcontrollers without level shifting |
| Max Clock Frequency | 1 MHz at 2.7V - ensures reliable timing margin in noise-prone industrial environments |
| Write Cycle Time | 10 ms maximum - defines minimum interval between successive writes; impacts firmware update latency |
| Endurance | 1 million write cycles - supports frequent field calibration or logging in telemetry systems |
| Data Retention | 100 years at 25°C - guarantees long-term parameter persistence across product lifecycle |
| Operating Temperature | −40°C to +85°C - qualified for industrial control, automotive body electronics, and outdoor equipment |
Pinout & Package
AT93C66-10SC is supplied in an 8-lead JEDEC-standard SOIC package (8S1), 0.150" wide, with gull-wing leads and standard 1.27 mm pitch. Pin 1 is marked by a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must be held low for entire instruction sequence; determines READY/BUSY status visibility on DO |
| SK | Serial Clock | Input clock synchronizing all data transfers; rising edge samples DI, shifts DO; max 1 MHz at 2.7V |
| DI | Data Input | Serial instruction and address/data input; accepts 7-bit opcodes, 9-bit addresses, and 8-/16-bit payloads |
| DO | Data Output | Open-drain output delivering read data or READY/BUSY status; requires external pull-up |
| VCC | Power Supply | Primary supply rail; powers internal logic and EEPROM array; decoupling capacitor required per layout guidelines |
| GND | Ground | Reference return path for all signals and internal circuitry; must be low-impedance connection |
| ORG | Organization Select | Logic-high selects 256 × 16 mode; grounded selects 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 only if required by board mechanical constraints |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configurable 512 × 8 or 256 × 16 layout via ORG pin - eliminates firmware rework when migrating between byte- and word-oriented systems |
| Low-voltage operation down to 2.7V | Guaranteed functionality at 2.7V supply - supports battery-backed or energy-harvesting applications without voltage boosters |
| Self-timed write cycle | No external timing control needed; internal state machine completes erase+write in ≤10 ms - simplifies host software and reduces interrupt latency |
| High ESD immunity | ≥4000V HBM - protects against handling damage and transient events in assembly and field service |
| Industrial temperature grade | Rated −40°C to +85°C - validated for use in motor drives, PLC I/O modules, and outdoor gateways without derating |
Applications
| Industrial Sensor Calibration | Embedded Controller Configuration |
|---|---|
Use Scenario: Storing factory-trimmed offset/gain coefficients and linearization tables for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed during boot and runtime recalibration; ORG pin set to x16 for efficient coefficient packing. Use Value: Eliminates need for external trimming components and enables field updates via serial interface - reducing BOM count and enabling predictive maintenance. |
Use Scenario: Holding boot configuration flags, communication protocol settings, and security keys in microcontroller-based HVAC controllers. IC Role / Device Role / Timing Role: Serial configuration register mapped into MCU's peripheral address space via GPIO bit-banging; accessed only during initialization. Use Value: Enables OEM-specific feature locking and regional compliance settings without firmware reflash - accelerating time-to-market for global variants. |
| Power Management Unit (PMU) Trim | Legacy Industrial Equipment Upgrade |
Use Scenario: Storing dynamic voltage scaling thresholds and overcurrent trip points in DC-DC controller ICs used in telecom rectifiers. IC Role / Device Role / Timing Role: Dedicated trim memory accessed by PMU's internal state machine; write-protected after factory programming using EWDS instruction. Use Value: Allows precise, post-manufacturing calibration of output regulation accuracy - improving efficiency and thermal performance across production lot variance. |
Use Scenario: Replacing obsolete EPROMs in 1990s-era CNC motion controllers where PCB footprint and pinout must match original design. IC Role / Device Role / Timing Role: Drop-in replacement for 27C64-style parallel EPROMs using bit-banged 3-wire emulation; SOIC-8 matches original SOIC-28 socket adapter footprint. Use Value: Extends product lifecycle without PCB redesign; leverages existing firmware drivers with minimal HAL layer modification. |
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, 1.8V–5.5V, 5 ms write cycle, WLCSP package | Higher density, faster write, but requires SPI hardware support and different command protocol | Choose for new designs needing >4K-bit capacity and SPI-native MCUs; not pin-compatible |
| AT25DF041A-SH-T | 4-Mbit SPI DataFlash, 2.7V–3.6V, sector-erase architecture, 8-lead SOIC | Block-erase capability and faster sequential reads, but lacks byte-write granularity and ORG flexibility | Prefer when firmware image storage or bulk logging is required; incompatible instruction set and voltage range |
Compared with M95M02-DRMN6TP/K and AT25DF041A-SH-T, the AT93C66-10SC offers unique ORG-pin configurability, guaranteed 2.7V operation, and instruction-set simplicity - making it optimal for cost-sensitive, resource-constrained upgrades where legacy 3-wire compatibility and deterministic 10 ms write timing are mandatory.
Availability
AT93C66-10SC is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded controller configuration, and power management unit trim requiring stable component supply across extended product lifecycles.
Supply support for AT93C66-10SC 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 acquired Atmel in 2016 and maintains full technical and manufacturing continuity for the AT93C family. The company specializes in microcontrollers, analog, and nonvolatile memory solutions for industrial and automotive markets.
The AT93C66-10SC belongs to Microchip's legacy serial EEPROM product line, designed specifically for low-pin-count, low-power, and pin-compatible replacements of older EPROM and parallel EEPROM devices in space- and cost-constrained embedded systems.
FAQ
What is the memory organization of the AT93C66-10SC, and how is it selected?
The AT93C66-10SC supports two memory organizations: 512 × 8 bits or 256 × 16 bits. Selection is controlled by the ORG pin - tied to VCC for x16 mode, grounded for x8 mode, or left unconnected to default to x16 via internal pull-up. This hardware-selectable configuration avoids firmware changes when adapting to different data-width requirements in the AT93C66-10SC implementation.
Does the AT93C66-10SC require an external erase cycle before writing?
No, the AT93C66-10SC does not require a separate erase cycle. Each WRITE instruction performs both erase and program operations automatically within its self-timed 10 ms window. The device enters the Erase/Write Enable (EWEN) state only after explicit host command, ensuring data integrity until intentional programming occurs - a core behavior of the AT93C66-10SC architecture.
What is the maximum clock frequency supported by the AT93C66-10SC at 2.7V?
At VCC = 2.7V, the AT93C66-10SC supports a maximum serial clock (SK) frequency of 1 MHz. This value is specified in the AC Characteristics table under "2.7V ≤ VCC ≤ 5.5V" condition and reflects guaranteed timing margins for reliable operation in industrial environments - a key timing constraint for the AT93C66-10SC in real-world deployments.
Can the AT93C66-10SC be used in automotive applications?
The AT93C66-10SC is rated for industrial temperature (−40°C to +85°C) and is not AEC-Q100 qualified. While it may function in some automotive cabin or body-control applications, Microchip does not certify the AT93C66-10SC for under-hood or safety-critical automotive use. For such roles, dedicated automotive-grade EEPROMs like the 24AA1025 should be selected instead of the AT93C66-10SC.
How is write protection implemented on the AT93C66-10SC?
Write protection on the AT93C66-10SC is enforced via the Erase/Write Disable (EWDS) instruction, which locks all programming functions until the next power cycle or an explicit EWEN command. Unlike hardware WP pins, this is a software-controlled state - meaning the AT93C66-10SC relies on correct host firmware sequencing to prevent accidental writes, especially after factory programming.
AT93C66-10SC 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT93C66-10SC FAQ
1.How can I place an order for AT93C66-10SC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66-10SC 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 reliable?
The price and inventory of AT93C66-10SC 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 is usually 5 days.
3.What payment methods are accepted for AT93C66-10SC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66-10SC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66-10SC?
AT93C66-10SC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66-10SC 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?
For technical support, including AT93C66-10SC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66-10SC requirements.
6.How does Aetrix verify that AT93C66-10SC is sourced from the original manufacturer or authorized distributors?
All AT93C66-10SC 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 meets industry standards.
7.What is the process for return or replacement of AT93C66-10SC?
All AT93C66-10SC units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66-10SC, 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 part is unused and in its original packaging.
Return procedure for AT93C66-10SC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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