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Microchip Technology AT93C66W-10SI-2.5
- Part No.:
- AT93C66W-10SI-2.5
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT93C66W-10SI-2.5.pdf
- Description:
- IC EEPROM 4KBIT 3-WIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,927
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Product details
Overview
AT93C66W-10SI-2.5 from Microchip Technology (formerly Atmel) is a 4-kbit serial EEPROM with 3-wire interface, configurable as 512 × 8 or 256 × 16 organization, operating from 2.5V to 5.5V supply, and rated for industrial temperature range (−40°C to +85°C). It delivers 2 MHz clock rate at 5V, 10 ms max self-timed write cycle, and supports embedded system configuration storage in automotive control modules.
For engineers reviewing the AT93C66W-10SI-2.5 datasheet, AT93C66W-10SI-2.5 pinout, AT93C66W-10SI-2.5 application, or AT93C66W-10SI-2.5 equivalent, key selection criteria include low-voltage operation down to 2.5V, industrial-grade reliability (1M write cycles, 100-year data retention), SOIC-8 package compatibility, and ORG-pin-selectable memory width for flexible firmware mapping.
Technical Context
The AT93C66W-10SI-2.5 implements a synchronous 3-wire serial interface (CS, SK, DI/DO) with start-bit–driven instruction decoding. Its internal architecture supports dual-word-width addressing via the ORG pin: tied to VCC selects 256 × 16 mode; grounded selects 512 × 8 mode.
Write operations require explicit EWEN enable prior to ERASE or WRITE instructions; status feedback is provided via DO pin during CS high after tCS ≥ 250 ns. The device uses no external erase cycle and features built-in ESD protection (>4000V HBM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4096 bits (512 × 8 or 256 × 16 organization) |
| Supply Voltage Range | 2.5V to 5.5V - enables direct interfacing with 2.5V/3.3V microcontrollers without level shifting |
| Max Clock Frequency | 2 MHz at VCC = 5V - supports fast configuration reads in real-time systems |
| Write Cycle Time | 10 ms maximum - defines minimum interval between successive writes; impacts boot-time parameter update latency |
| Endurance | 1 million write cycles - ensures >10 years of daily reconfiguration in industrial logging applications |
| Data Retention | 100 years at 25°C - guarantees long-term calibration storage without refresh |
| Operating Temperature | −40°C to +85°C - qualified for under-hood automotive and factory-floor industrial use |
Pinout & Package
AT93C66W-10SI-2.5 is supplied in an 8-lead JEDEC-standard SOIC package (8S1), 3.9 mm × 4.9 mm body, 1.27 mm lead pitch, gull-wing leads. Pin 1 marked by notch or dot; pin 1 corner located at top-left when marking side faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable: must be low for instruction initiation; high after tCS ≥ 250 ns returns DO to READY/BUSY status |
| SK | Serial Clock | Synchronizes all data transfers; rising edge samples DI, shifts DO; min period 500 ns at 2.5V |
| DI | Data Input | Receives start bit, op code, address, and write data; setup/hold times scale with VCC (e.g., 200 ns at 2.5V) |
| DO | Data Output | Outputs read data or READY/BUSY status; high-impedance when CS high and not in status-read window |
| VCC | Power Supply | 2.5V–5.5V input; decoupling capacitor (0.1 µF) required within 10 mm of pin |
| GND | Ground | Reference for all I/O and internal logic; separate analog/digital ground not required |
| ORG | Organization Select | High = 256 × 16 mode; low = 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 board layout requires stub termination |
Key Features
| Feature | Design Value |
|---|---|
| User-selectable memory organization | Hardware-configurable 512 × 8 or 256 × 16 layout via ORG pin - eliminates software address remapping in firmware |
| Self-timed write cycle | No external timing control needed; internal state machine completes erase+write in ≤10 ms - simplifies host MCU driver design |
| Industrial temperature rating | −40°C to +85°C operation - validated across full range for automotive body control units and PLC I/O modules |
| ESD robustness | >4000V HBM - withstands handling and board-level transients without external protection components |
| Low standby current | 10 µA max at 2.5V - reduces quiescent power in battery-backed systems such as smart sensors |
Applications
| Automotive Body Control Module | Industrial PLC I/O Configuration |
|---|---|
Use Scenario: Storing door lock actuator calibration offsets and seat position presets across vehicle lifetime. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding user-specific settings accessible during cold boot. Use Value: Enables field-updatable calibration without requiring reprogramming tools; 100-year retention prevents loss during vehicle decommissioning. |
Use Scenario: Holding module identification, channel scaling factors, and alarm thresholds in modular I/O terminals. IC Role / Device Role / Timing Role: Serial configuration store accessed by host controller during power-on initialization. Use Value: Allows hot-swap replacement of I/O modules without manual DIP-switch setup; ORG pin flexibility supports legacy 8-bit or modern 16-bit firmware layouts. |
| Medical Infusion Pump Calibration | Smart Energy Meter Firmware Parameters |
Use Scenario: Recording flow-rate correction coefficients and safety limit adjustments validated during regulatory calibration. IC Role / Device Role / Timing Role: Tamper-resistant parameter vault accessed only during authorized service mode. Use Value: Meets IEC 62304 traceability requirements; 1M endurance supports >1000 recalibrations over product lifecycle. |
Use Scenario: Storing tariff schedules, CT/PT ratios, and communication protocol keys in utility-grade meters. IC Role / Device Role / Timing Role: Secure nonvolatile storage for critical billing parameters updated remotely via secure channel. Use Value: 2.5V operation allows direct interface with meter's 3.3V power rail; ESD immunity prevents corruption during field installation. |
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 interface, 5V-only supply (4.5–5.5V), no ORG pin, 5 ms write time | Lacks voltage flexibility and organization select; requires SPI-capable host | Choose for higher density where 5V-only systems and SPI infrastructure exist |
| BR24G64FJ-3GE2 | I²C interface, 1.7–5.5V supply, 5 ms write time, 1.2 MHz max clock, no ORG pin | Requires I²C bus arbitration; no hardware-configurable word width | Prefer when existing I²C bus is available and firmware already supports byte-addressed access |
Compared with AT93C66W-10SI-2.5, the M95M04-DRMN6TP/K offers higher density but sacrifices low-voltage operation and organization flexibility, while the BR24G64FJ-3GE2 provides broader voltage range and faster writes but mandates I²C protocol support and removes hardware-based memory width selection.
Availability
AT93C66W-10SI-2.5 is available at Aetrix Electronics and suitable for automotive body control, industrial PLC configuration, and medical device calibration requiring stable component supply across extended temperature and low-voltage conditions.
Supply support for AT93C66W-10SI-2.5 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 memory solutions for industrial and automotive markets.
The AT93C66W-10SI-2.5 belongs to Microchip's legacy serial EEPROM product line, designed specifically for cost-sensitive, space-constrained applications needing reliable nonvolatile storage with minimal pin count and flexible voltage operation.
FAQ
What is the function of the ORG pin on the AT93C66W-10SI-2.5?
The ORG pin on the AT93C66W-10SI-2.5 selects internal memory organization: tied to VCC enables 256 × 16 mode; grounded enables 512 × 8 mode. When left unconnected, an internal ~1 MΩ pull-up defaults to x16 mode. This hardware-selectable width eliminates firmware address translation and supports both legacy and modern data structures in the same AT93C66W-10SI-2.5 footprint.
Does the AT93C66W-10SI-2.5 require an external erase command before writing?
No, the AT93C66W-10SI-2.5 does not require a separate erase command before writing. Each WRITE instruction performs automatic erase-and-program in a single self-timed cycle (≤10 ms). However, the device must first enter the Erase/Write Enable (EWEN) state via the EWEN instruction; subsequent WRITE commands then execute autonomously without additional erase steps.
Can the AT93C66W-10SI-2.5 operate reliably at 2.5V supply?
Yes, the AT93C66W-10SI-2.5 is fully specified for 2.5V to 5.5V operation. At 2.5V, it supports 500 kHz max clock frequency, 10 µA max standby current, and retains full functionality including ORG pin selection and READY/BUSY status reporting. This makes the AT93C66W-10SI-2.5 suitable for direct integration with 2.5V/3.3V microcontrollers without level-shifting circuitry.
How is write protection implemented on the AT93C66W-10SI-2.5?
Write protection on the AT93C66W-10SI-2.5 is enforced through instruction gating: programming instructions (WRITE, ERASE, WRAL, ERAL) are disabled until an EWEN instruction is issued. After any programming sequence, executing EWDS disables all write functions. Power cycling resets the device to EWDS state. No hardware write-protect pin exists - protection relies entirely on controlled instruction sequencing.
What package type is used for the AT93C66W-10SI-2.5?
The AT93C66W-10SI-2.5 uses an 8-lead JEDEC-standard SOIC package (designated 8S1), measuring 3.9 mm × 4.9 mm with 1.27 mm lead pitch and gull-wing leads. The "SI" suffix in the part number explicitly denotes this SOIC-8 industrial-temperature variant, distinguishing it from PDIP (PI), TSSOP (TI), or rotated SOIC (R) versions.
AT93C66W-10SI-2.5 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:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT93C66W-10SI-2.5 FAQ
1.How can I place an order for AT93C66W-10SI-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT93C66W-10SI-2.5 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 AT93C66W-10SI-2.5 reliable?
The price and inventory of AT93C66W-10SI-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT93C66W-10SI-2.5 is usually 5 days.
3.What payment methods are accepted for AT93C66W-10SI-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT93C66W-10SI-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT93C66W-10SI-2.5?
AT93C66W-10SI-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT93C66W-10SI-2.5 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 AT93C66W-10SI-2.5?
For technical support, including AT93C66W-10SI-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT93C66W-10SI-2.5 requirements.
6.How does Aetrix verify that AT93C66W-10SI-2.5 is sourced from the original manufacturer or authorized distributors?
All AT93C66W-10SI-2.5 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 AT93C66W-10SI-2.5 meets industry standards.
7.What is the process for return or replacement of AT93C66W-10SI-2.5?
All AT93C66W-10SI-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with AT93C66W-10SI-2.5, 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 AT93C66W-10SI-2.5 part is unused and in its original packaging.
Return procedure for AT93C66W-10SI-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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