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Microchip Technology 93AA66BXT-I/SN
- Part No.:
- 93AA66BXT-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93AA66BXT-I/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,547
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Product details
Overview
93AA66BXT-I/SN from Microchip Technology is a 4 Kbit low-voltage serial EEPROM with 256 × 16-bit organization, 1.8–5.5 V supply range, industrial temperature rating (–40°C to +85°C), and Microwire-compatible 3-wire serial interface. It features self-timed erase/write cycles, automatic ERAL before WRAL, and power-on/off data protection - used in microcontroller configuration storage and sensor calibration retention.
For engineers reviewing the 93AA66BXT-I/SN datasheet, 93AA66BXT-I/SN pinout, 93AA66BXT-I/SN application, or 93AA66BXT-I/SN equivalent, key selection criteria include guaranteed 1,000,000 erase/write cycles, >200-year data retention, Ready/Busy status signaling via DO, and compatibility with 3-wire SPI-like host controllers requiring minimal GPIO overhead.
Technical Context
This device implements a synchronous serial interface using CS, CLK, and DI/DO lines with start-bit detection and opcode-driven command execution. Memory access follows x16 organization (no ORG pin on 'B' variants), supporting READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS instructions with fixed clock-cycle counts per operation.
Internal logic includes auto-erase-before-write, hardware-based power-loss protection, and status polling via DO pin during programming. The device enters Standby mode when CS is low and requires ≥250 ns CS low time between commands - compatible with MCUs lacking dedicated SPI peripherals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (256 × 16-bit) - provides compact nonvolatile storage for firmware parameters or calibration coefficients |
| VCC range | 1.8–5.5 V - supports direct interfacing with 1.8 V, 3.3 V, and 5 V logic systems without level shifting |
| Endurance | 1,000,000 erase/write cycles - enables reliable field updates in programmable logic controllers and IoT edge nodes |
| Data retention | >200 years at 25°C - ensures long-term integrity of stored configuration data across product lifecycles |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - reduces MCU pin count vs. parallel or I²C EEPROMs |
| Timing (TWC) | 6 ms typical erase/write cycle - defines minimum delay before polling DO for Ready/Busy status |
| Temp range | –40°C to +85°C (Industrial) - validated for use in automotive body control modules and industrial HMIs |
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 = NC (no internal connection), Pin 7 = NC, Pin 8 = VCC. No ORG pin - fixed 16-bit word organization per device family specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable signal; must be held low ≥250 ns between commands to reset internal state |
| CLK | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcodes, addresses, and data bits |
| DI | Data Input | Receives start bit, instruction opcodes, memory addresses, and write data |
| DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); high-Z when CS is low or not reading |
| VSS | Ground | Reference for all input thresholds and output drive levels; must be connected to system ground plane |
| VCC | Power Supply | Supplies core logic and memory array; voltage detect circuitry disables writes below 1.5 V |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control - host MCU only polls DO for completion |
| Automatic ERAL before WRAL | Ensures full-array write reliability without requiring separate erase command in firmware |
| Power-on/off data protection | Hardware lockout prevents corruption during brown-out or reset sequences |
| Ready/Busy status on DO | Enables efficient polling-based programming without dedicated interrupt lines or timers |
| 1.8 V operation support | Permits direct integration into ultra-low-power battery-operated devices such as wireless sensors |
Applications
| Microcontroller Configuration Storage | Sensor Calibration Data Retention |
|---|---|
Use Scenario: Storing bootloader settings, communication protocol parameters, and user-defined defaults in an ARM Cortex-M0+ based motor controller. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed during startup and runtime reconfiguration. Use Value: Enables field-upgradable parameter sets without requiring flash reprogramming or external storage interfaces. | Use Scenario: Holding factory-trimmed offset/gain coefficients for a precision analog temperature sensor in HVAC equipment. IC Role / Device Role / Timing Role: Persistent calibration memory read once at power-on and applied to ADC conversion routines. Use Value: Maintains measurement accuracy over 10+ year product lifetime without recalibration service visits. |
| Industrial HMI Display Settings | Smart Meter Firmware Patch Storage |
Use Scenario: Saving display brightness, language selection, and contrast preferences in a panel-mounted HMI running RTOS. IC Role / Device Role / Timing Role: User preference store updated infrequently but requiring instant recall after power loss. Use Value: Delivers consistent UI experience across cold starts while minimizing wear on main application flash. | Use Scenario: Storing small firmware patches applied during OTA updates in utility-grade electricity meters. IC Role / Device Role / Timing Role: Secure patch repository accessed only during verified update sequences. Use Value: Supports modular firmware evolution without full image replacement, reducing bandwidth and risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66B-I/SN | 2.5–5.5 V VCC range; same 256×16-bit organization and pinout | Requires higher minimum supply voltage - unsuitable for 1.8 V systems | Select when operating exclusively at 3.3 V or 5 V and needing identical timing and instruction set |
| AT25040B-MAU-1.8 | 4 Kbit SPI interface (4-wire), 1.8–5.5 V, 20 MHz max clock | Uses SPI protocol instead of Microwire; requires additional CS and SO pins | Choose for designs already using SPI peripherals and requiring faster random-access reads |
Compared with 93LC66B-I/SN, the 93AA66BXT-I/SN supports lower-voltage operation down to 1.8 V and offers tighter power-loss protection thresholds; versus AT25040B-MAU-1.8, it uses fewer pins and simpler timing but lacks SPI's higher throughput and standard command set.
Availability
93AA66BXT-I/SN is available at Aetrix Electronics and suitable for microcontroller configuration storage, sensor calibration data retention, and industrial HMI display settings requiring stable component supply across extended production cycles.
Supply support for 93AA66BXT-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 microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona.
The 93XX series EEPROMs were designed for cost-sensitive, low-pin-count embedded systems requiring robust nonvolatile storage with minimal MCU resource usage - especially where SPI peripherals are unavailable or power efficiency is critical.
FAQ
What is the memory organization of the 93AA66BXT-I/SN?
The 93AA66BXT-I/SN has a fixed 256 × 16-bit organization (4 Kbit total), confirmed by its 'B' suffix and absence of ORG pin. This means each address holds 16 bits of data, requiring two consecutive bytes for read/write operations in 8-bit systems - no external configuration is needed to select word size.
Does the 93AA66BXT-I/SN require an external ORG pin connection?
No, the 93AA66BXT-I/SN does not require or support an ORG pin. As a 'B'-suffix device, it is factory-configured for 16-bit word organization. Pin 6 and Pin 7 are marked NC (no internal connection) in the SOIC package, and the datasheet explicitly states ORG is unavailable on 'A' and 'B' versions.
What is the maximum clock frequency supported by the 93AA66BXT-I/SN at 3.3 V?
At VCC = 3.3 V (within 2.5–5.5 V range), the 93AA66BXT-I/SN supports up to 2 MHz clock frequency, per Table 1-2 AC Characteristics. This is confirmed for 2.5 V ≤ VCC < 5.5 V operation - exceeding this frequency risks setup/hold timing violations and unreliable command execution.
How does the Ready/Busy status work on the 93AA66BXT-I/SN DO pin?
During erase or write operations, the DO pin outputs Ready/Busy status: logic low indicates programming is still in progress, and logic high signals completion. To read status, CS must be brought high for ≥250 ns after TCSL - DO returns to high-Z if CS remains low throughout the cycle.
Is the 93AA66BXT-I/SN RoHS compliant and Pb-free?
Yes, the 93AA66BXT-I/SN is Pb-free and RoHS compliant, as stated in the Features section of DS21795E. The SOIC (SN) package uses Matte Tin (Sn) finish, meeting JEDEC J-STD-609A Class 1 requirements for lead-free termination.
93AA66BXT-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:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 4Kbit
- Memory Organization:
- 256 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 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
93AA66BXT-I/SN FAQ
1.How can I place an order for 93AA66BXT-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA66BXT-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 93AA66BXT-I/SN reliable?
The price and inventory of 93AA66BXT-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 93AA66BXT-I/SN is usually 5 days.
3.What payment methods are accepted for 93AA66BXT-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA66BXT-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA66BXT-I/SN?
93AA66BXT-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA66BXT-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 93AA66BXT-I/SN?
For technical support, including 93AA66BXT-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA66BXT-I/SN requirements.
6.How does Aetrix verify that 93AA66BXT-I/SN is sourced from the original manufacturer or authorized distributors?
All 93AA66BXT-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 93AA66BXT-I/SN meets industry standards.
7.What is the process for return or replacement of 93AA66BXT-I/SN?
All 93AA66BXT-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93AA66BXT-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 93AA66BXT-I/SN part is unused and in its original packaging.
Return procedure for 93AA66BXT-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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