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Microchip Technology 93AA66CT-I/SN
- Part No.:
- 93AA66CT-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93AA66CT-I/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,629
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Product details
Overview
93AA66CT-I/SN from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 1.8–5.5 V supply range, and configurable 8-/16-bit word organization via ORG pin. It delivers 1 million erase/write cycles, >200-year data retention, and industrial temperature operation (–40°C to +85°C) in an 8-lead SOIC package. Used for configuration storage in embedded controllers and power management ICs.
For engineers reviewing the 93AA66CT-I/SN datasheet, 93AA66CT-I/SN pinout, 93AA66CT-I/SN application, or 93AA66CT-I/SN equivalent, key selection criteria include voltage compatibility (1.8–5.5 V), ORG-configurable word size, Ready/Busy status signaling, self-timed write/erase, and industrial-grade reliability for nonvolatile parameter storage.
Technical Context
The 93AA66CT-I/SN implements a synchronous serial Microwire interface with CS, CLK, DI, and DO signals, supporting both x8 and x16 memory organizations selected by the ORG pin level. It uses self-timed internal erase-before-write logic and includes automatic ERAL and WRAL commands.
Power-on/off data protection circuitry inhibits all operations below 1.5 V, and EWEN/EWDS commands provide software-controlled write enable/disable. The device outputs Ready/Busy status on DO during programming and supports sequential read when CS remains high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8-bit or 256 × 16-bit) |
| VCC range | 1.8 V to 5.5 V - enables direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without level shifters |
| Endurance | 1,000,000 erase/write cycles - supports frequent field calibration or logging in industrial firmware |
| Data retention | >200 years at 25°C - ensures long-term validity of stored calibration coefficients or security keys |
| Write cycle time | 6 ms typical - defines minimum interval between successive write commands |
| Operating temp | –40°C to +85°C - qualified for industrial control, metering, and automotive body electronics |
| Interface | 3-wire Microwire (CS/CLK/DI/DO) - minimal GPIO usage; no SPI mode select required |
Pinout & Package
8-lead SOIC (SN) package with standard pinout: Pin 1 = CS, Pin 2 = CLK, Pin 3 = DI, Pin 4 = DO, Pin 5 = VSS, Pin 6 = ORG, Pin 7 = NC, Pin 8 = VCC. ORG pin selects 8-bit (low) or 16-bit (high) organization; NC pin has no internal connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions to reset internal logic |
| CLK | Serial Clock | Rising-edge synchronized I/O; clock can pause mid-transfer without corruption |
| DI | Data Input | Accepts Start bit, opcode, address, and data; requires external pull-up for open-drain compatibility |
| DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z when CS is low |
| ORG | Organization Select | Logic high → 256 × 16-bit; logic low → 512 × 8-bit; must be statically tied before operation |
| VSS | Ground | Reference for all I/O and internal logic; separate from system analog ground in mixed-signal designs |
| NC | No Connection | Unbonded pad; must remain floating - no PCB trace or thermal pad connection |
| VCC | Power Supply | Supplies core and I/O; internal POR triggers at ~1.5 V to prevent partial writes during brownout |
Key Features
| Feature | Design Value |
|---|---|
| ORG-pin word-size selection | Enables single hardware design to support both 8-bit and 16-bit host interfaces without firmware change |
| Self-timed erase/write | Eliminates need for external timing control or polling delays beyond TWC (6 ms max) |
| Automatic ERAL before WRAL | Guarantees full-array write success without requiring explicit erase command sequence |
| Ready/Busy on DO pin | Allows real-time status monitoring using only one GPIO - no additional status register read needed |
| EWEN/EWDS write protection | Prevents accidental overwrites during interrupt service or power transitions; defaults to disabled on power-up |
Applications
| Industrial Sensor Calibration | Embedded Power Management |
|---|---|
Use Scenario: Storing factory-trimmed offset/gain coefficients for temperature, pressure, and current sensors in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration memory holding calibration constants accessed at boot and updated during field recalibration. Use Value: Enables plug-and-play sensor replacement with zero manual setup; 1M endurance supports lifetime recalibration in predictive maintenance systems. | Use Scenario: Retaining overvoltage/undervoltage thresholds, fault log counters, and soft-start parameters in DC-DC controller modules. IC Role / Device Role / Timing Role: Parameter store for power ICs; accessed during startup and written after fault events or user configuration changes. Use Value: Ensures consistent power behavior across reboots; >200-year retention guarantees settings survive equipment decommissioning and redeployment. |
| Automotive Body Control Unit | Medical Device Configuration |
Use Scenario: Saving seat position memory, mirror angle presets, and lighting profiles in vehicle body control modules. IC Role / Device Role / Timing Role: User preference storage with industrial temperature rating matching under-hood ECU environments. Use Value: Supports –40°C to +85°C operation without derating; ORG pin allows reuse across 8-bit MCU platforms (e.g., PIC16) and 16-bit platforms (e.g., dsPIC). | Use Scenario: Holding regulatory-compliant device IDs, calibration dates, and operator access levels in portable diagnostic instruments. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage for audit-trail-critical parameters; accessed only during authorized service mode. Use Value: EWEN/EWDS commands enforce write-lock after commissioning; Pb-free RoHS compliance meets IEC 60601-1 medical safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66CT-I/SN | 2.5–5.5 V VCC range; identical pinout and instruction set; same 4 Kbit capacity and ORG functionality | Requires minimum 2.5 V supply - unsuitable for 1.8 V systems but offers tighter VIL/VIH thresholds at 3.3 V | Select when operating exclusively at 3.3 V or 5 V and higher noise immunity is prioritized over ultra-low-voltage support |
| AT25040B-MAHL-T | SPI interface (4-wire), 1.8–5.5 V, 512 × 8-bit only, no ORG pin; 20 MHz max clock vs. 3 MHz for 93AA66CT-I/SN | Lacks hardware word-size flexibility; requires different driver code and GPIO allocation due to separate SO/SI pins | Choose for higher-speed read/write throughput or when migrating to SPI-based firmware architecture |
Compared with 93LC66CT-I/SN and AT25040B-MAHL-T, the 93AA66CT-I/SN uniquely supports 1.8 V operation and hardware-selectable word size - critical for mixed-voltage designs and legacy Microwire-based platforms where SPI migration is impractical.
Availability
93AA66CT-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded power management, and automotive body control unit designs requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.
Supply support for 93AA66CT-I/SN 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 Inc. is a leading provider of microcontroller, analog, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93XX series EEPROMs - including the 93AA66CT-I/SN - were designed for low-power, board-level nonvolatile storage in space-constrained embedded systems where reliability, voltage flexibility, and interface simplicity are essential.
FAQ
What is the function of the ORG pin on the 93AA66CT-I/SN?
The ORG pin on the 93AA66CT-I/SN selects memory organization: logic high configures 256 × 16-bit mode, logic low configures 512 × 8-bit mode. It must be statically tied to VCC or VSS before any instruction; floating is undefined. This hardware-selectable word size eliminates firmware branching for different host bus widths and is unique to 'C'-suffix variants like the 93AA66CT-I/SN.
Does the 93AA66CT-I/SN require external timing components for write operations?
No, the 93AA66CT-I/SN performs self-timed erase and write cycles internally. After issuing a WRITE or ERASE command and meeting timing requirements (e.g., TCSL ≥250 ns), the device automatically executes auto-erase-then-program without external delay or clock gating. The maximum TWC is 6 ms, and readiness is signaled via DO pin status - no external RC timers or firmware delays are needed.
How does the 93AA66CT-I/SN protect against inadvertent writes during power transitions?
The 93AA66CT-I/SN incorporates dual-layer protection: (1) hardware POR circuitry inhibits all operations below ~1.5 V, and (2) it powers up in EWDS (Erase/Write Disable) state, blocking all programming until an explicit EWEN command is issued. This ensures that brownouts, resets, or noisy power ramps cannot corrupt memory - a critical feature confirmed in DS21795E Section 2.6 and Table 1-1 D11.
Can the 93AA66CT-I/SN be used with a 1.8 V microcontroller without level shifting?
Yes, the 93AA66CT-I/SN supports full 1.8–5.5 V operation, including guaranteed VIH/VIL thresholds at 1.8 V (VIH1 = 2.0 V min, VIL1 = 0.8 V max per Table 1-1). Its input leakage (±1 µA) and output drive (VOL ≤0.4 V at 2.1 mA) are compatible with 1.8 V CMOS logic families, enabling direct connection to low-voltage MCUs such as PIC12F, SAMD, or MSP430 without level translators.
What is the significance of the 'T' and 'I' suffixes in 93AA66CT-I/SN?
In 93AA66CT-I/SN, 'T' denotes tape-and-reel packaging (standard for automated assembly), and 'I' specifies Industrial temperature grade (–40°C to +85°C). The '/SN' suffix indicates 8-lead SOIC package per Microchip's standardized ordering code convention. These identifiers are defined in DS21795E Section 4.1 and ensure correct mechanical, thermal, and logistics alignment for production use.
93AA66CT-I/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 4Kbit
- Memory Organization:
- 512 x 8, 256 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 3 MHz
- Write Cycle Time - Word, Page:
- 6ms
- 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
93AA66CT-I/SN FAQ
1.How can I place an order for 93AA66CT-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA66CT-I/SN 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 93AA66CT-I/SN reliable?
The price and inventory of 93AA66CT-I/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93AA66CT-I/SN is usually 5 days.
3.What payment methods are accepted for 93AA66CT-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA66CT-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA66CT-I/SN?
93AA66CT-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA66CT-I/SN 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 93AA66CT-I/SN?
For technical support, including 93AA66CT-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA66CT-I/SN requirements.
6.How does Aetrix verify that 93AA66CT-I/SN is sourced from the original manufacturer or authorized distributors?
All 93AA66CT-I/SN 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 93AA66CT-I/SN meets industry standards.
7.What is the process for return or replacement of 93AA66CT-I/SN?
All 93AA66CT-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93AA66CT-I/SN, 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 93AA66CT-I/SN part is unused and in its original packaging.
Return procedure for 93AA66CT-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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