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Microchip Technology 93AA66BX-I/SN
- Part No.:
- 93AA66BX-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93AA66BX-I/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,884
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Product details
Overview
93AA66BX-I/SN from Microchip Technology is a 4 Kbit low-voltage serial EEPROM with 512 × 8-bit organization, supporting 1.8–5.5 V operation and industrial temperature range (−40°C to +85°C). It features Microwire-compatible 3-wire serial interface (CS/CLK/DI/DO), self-timed erase/write cycles, automatic ERAL before WRAL, and power-on/off data protection. It is used in microcontroller system configuration storage where nonvolatile, low-power, byte-serial memory is required.
For engineers reviewing the 93AA66BX-I/SN datasheet, 93AA66BX-I/SN pinout, 93AA66BX-I/SN application, or 93AA66BX-I/SN equivalent, key selection criteria include voltage compatibility (1.8–5.5 V), 8-bit fixed word size, industrial-grade reliability (1M erase/write cycles, >200-year data retention), and SOIC-8 package suitability for space-constrained embedded designs.
Technical Context
The 93AA66BX-I/SN implements a synchronous serial Microwire interface with start-bit detection, opcode-driven command set (READ, WRITE, ERASE, ERAL, WRAL, EWEN/EWDS), and Ready/Busy status output via DO pin. It uses internal auto-erase prior to write and supports sequential read when CS remains high.
Its memory array is organized as 512 words × 8 bits with no ORG pin-confirming fixed x8 configuration-and operates across full VCC range without external address latching. Power-on reset circuitry inhibits all operations below 1.5 V, and EWEN/EWDS commands provide software-controlled write protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Kbit (512 × 8-bit) - fixed x8 organization, no ORG pin required |
| VCC Range | 1.8 V to 5.5 V - supports wide supply range including 3.3 V and 5 V systems |
| Endurance | 1,000,000 erase/write cycles - enables long-term field reprogramming in firmware update or calibration applications |
| Data Retention | Greater than 200 years at 25°C - ensures reliable storage of critical configuration data over product lifetime |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - minimal GPIO usage, compatible with legacy MCU peripherals |
| Write Cycle Time | 6 ms typical (TWC) - deterministic timing for host firmware timeout handling during programming |
| Operating Temp | −40°C to +85°C (Industrial grade) - qualified for use in industrial control, metering, and automotive body electronics |
| Package | 8-lead SOIC (SN) - standard surface-mount footprint with 1.27 mm pitch, RoHS-compliant matte tin finish |
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. The 93AA66BX-I/SN has no ORG pin; pins 6 and 7 are unconnected and must be left floating or tied to ground per layout best practice.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CS | Chip Select | Active-high enable; device enters standby when low; minimum 250 ns low time required between instructions |
| 2 - CLK | Serial Clock | Synchronizes all data transfers on rising edge; clock can be paused mid-sequence without state loss |
| 3 - DI | Data Input | Accepts start bit, opcode, address, and write data; requires stable setup/hold timing relative to CLK |
| 4 - DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z when CS is low |
| 5 - VSS | Ground | Reference return path for all signals; must be low-impedance connection to minimize noise coupling |
| 6 - NC | No Connection | No internal bond; may be left unconnected or tied to VSS for mechanical stability |
| 7 - NC | No Connection | No internal bond; same handling as Pin 6 |
| 8 - VCC | Power Supply | Supplies core logic and memory array; internal POR circuit triggers below 1.5 V to block writes |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed Erase/Write | Eliminates need for external timing control; host only waits for DO status or fixed 6 ms timeout |
| Automatic ERAL before WRAL | Guarantees full-array erase before bulk write, preventing partial-data corruption in firmware updates |
| Power-On/Off Data Protection | Hardware-level VCC monitoring blocks all writes below 1.5 V, preventing inadvertent corruption during brownout |
| Ready/Busy Status on DO | Enables polling-based firmware flow without dedicated interrupt line or additional GPIO |
| Sequential Read Mode | Reduces transaction overhead by auto-incrementing address when CS stays high across multiple reads |
| EWEN/EWDS Write Protection | Software-lockable write enable prevents accidental overwrites during normal operation or reset sequences |
Applications
| Microcontroller Configuration Storage | Firmware Parameter Calibration |
|---|---|
Use Scenario: Storing boot configuration flags, I/O pin mappings, and peripheral initialization settings for an ARM Cortex-M0+ MCU in a smart sensor node. IC Role / Device Role / Timing Role: Nonvolatile serial memory providing persistent storage for system-critical startup parameters accessed during power-up sequence. Use Value: Enables field-upgradable configuration without requiring flash reprogramming; 1.8 V compatibility allows direct interfacing with low-voltage MCUs. | Use Scenario: Holding factory-calibrated ADC offset/gain coefficients and temperature compensation tables in a portable medical thermometer. IC Role / Device Role / Timing Role: Dedicated parameter store updated once during production test and read-only during operation. Use Value: Ensures measurement accuracy across temperature; >200-year retention guarantees calibration validity over product lifetime. |
| Industrial PLC I/O Module Settings | Automotive Body Control Unit NVM |
Use Scenario: Saving user-defined input filter thresholds, debounce times, and output drive modes in a DIN-rail mounted programmable logic controller module. IC Role / Device Role / Timing Role: Field-configurable memory accessible via RS-485 gateway MCU using Microwire bit-banged GPIO. Use Value: Supports flexible deployment across diverse automation environments; −40°C to +85°C rating ensures reliability in uncontrolled cabinet conditions. | Use Scenario: Storing seat position presets, mirror angle memories, and lighting profiles in a vehicle door module. IC Role / Device Role / Timing Role: Low-power serial EEPROM interfaced to an 8-bit automotive MCU for infrequent but persistent user preference storage. Use Value: 5.5 V max rating accommodates automotive load-dump transients; 1M endurance supports repeated user adjustments over vehicle lifetime. |
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 | 256 × 16-bit organization, 2.5–5.5 V VCC range, same SOIC-8 package | Requires 16-bit data path; not drop-in for 8-bit systems; higher density per word but fewer total addresses | Select only if system architecture uses 16-bit data transfers and requires tighter voltage margin above 2.5 V |
| AT25040B-MAU-1.8 | SPI interface (4-wire), 512 × 8-bit, 1.8–5.5 V, same industrial temp, SOIC-8 | Uses SPI protocol (with /CS, SCK, SI, SO) instead of Microwire; requires different driver code and pin assignment | Choose when migrating to SPI-standard peripherals or consolidating interface types across BOM |
Compared with 93LC66B-I/SN, the 93AA66BX-I/SN offers broader voltage support down to 1.8 V and fixed x8 addressing-critical for ultra-low-power battery systems. Against AT25040B-MAU-1.8, it retains Microwire compatibility for legacy designs but lacks SPI daisy-chain capability.
Availability
93AA66BX-I/SN is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, and automotive body electronics requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for 93AA66BX-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, with global design and manufacturing operations.
The 93AA66BX-I/SN belongs to Microchip's legacy 93XX series of Microwire-compatible serial EEPROMs, designed specifically for cost-sensitive, low-power embedded systems needing simple, robust nonvolatile storage without complex protocol stacks.
FAQ
What is the memory organization of the 93AA66BX-I/SN?
The 93AA66BX-I/SN has a fixed 512 × 8-bit (4 Kbit) organization with no ORG pin. Unlike 'C' variants, it does not support word-size selection-ensuring consistent 8-bit data transfers across all operations. This simplifies firmware development and eliminates configuration errors related to ORG pin biasing.
Does the 93AA66BX-I/SN require an external pull-up resistor on the DO pin?
Yes, the 93AA66BX-I/SN DO pin is open-drain and requires an external pull-up resistor (typically 4.7 kΩ to VCC) to ensure valid logic-high levels during Read and Ready/Busy status reporting. Without it, DO may float or fail to drive high-Z transitions reliably, especially under capacitive loads or at higher clock frequencies.
How does write protection work on the 93AA66BX-I/SN?
The 93AA66BX-I/SN powers up in Erase/Write Disable (EWDS) mode. An EWEN instruction must precede any ERASE or WRITE command, and an EWDS instruction should follow each write to re-enable protection. This two-step software lock prevents accidental overwrites during power glitches or firmware exceptions.
What is the maximum clock frequency supported by the 93AA66BX-I/SN at 3.3 V?
At VCC = 3.3 V (within 2.5–5.5 V range), the 93AA66BX-I/SN supports a maximum clock frequency of 2 MHz. This is specified in Table 1-2 (A1) for 2.5 V ≤ VCC < 5.5 V operation. Exceeding this limit risks setup/hold violations and command misreads.
Can the 93AA66BX-I/SN be used in automotive applications requiring AEC-Q200 qualification?
No, the 93AA66BX-I/SN is rated for Industrial temperature (−40°C to +85°C) and is not AEC-Q200 qualified. For automotive cabin or body applications requiring qualification, consider Microchip's AEC-Q200-certified variants such as the 93LC66BT-I/SN (E-temp version) or alternate qualified serial EEPROMs.
93AA66BX-I/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
93AA66BX-I/SN FAQ
1.How can I place an order for 93AA66BX-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA66BX-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 93AA66BX-I/SN reliable?
The price and inventory of 93AA66BX-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 93AA66BX-I/SN is usually 5 days.
3.What payment methods are accepted for 93AA66BX-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA66BX-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA66BX-I/SN?
93AA66BX-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA66BX-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 93AA66BX-I/SN?
For technical support, including 93AA66BX-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA66BX-I/SN requirements.
6.How does Aetrix verify that 93AA66BX-I/SN is sourced from the original manufacturer or authorized distributors?
All 93AA66BX-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 93AA66BX-I/SN meets industry standards.
7.What is the process for return or replacement of 93AA66BX-I/SN?
All 93AA66BX-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93AA66BX-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 93AA66BX-I/SN part is unused and in its original packaging.
Return procedure for 93AA66BX-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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