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Microchip Technology 93AA66AX-I/SN
- Part No.:
- 93AA66AX-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93AA66AX-I/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,815
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Product details
Overview
93AA66AX-I/SN from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with 512 × 8-bit organization, industrial temperature range (−40°C to +85°C), 1.8–5.5 V supply, and Microwire-compatible 3-wire serial interface. It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and 1,000,000 endurance cycles - used in embedded system configuration storage and calibration data retention.
For engineers reviewing the 93AA66AX-I/SN datasheet, 93AA66AX-I/SN pinout, 93AA66AX-I/SN application, or 93AA66AX-I/SN equivalent, key selection criteria include voltage compatibility (1.8–5.5 V), 8-bit fixed-word organization (no ORG pin), SOIC-8 package footprint, industrial-grade reliability, and Microwire protocol timing compliance at up to 3 MHz.
Technical Context
The 93AA66AX-I/SN implements a synchronous serial Microwire interface with CS, CLK, DI, and DO pins - no ORG pin (dedicated x8 mode). Communication requires a start condition (CS high + DI high on first CLK rising edge), followed by opcode, address, and data bits clocked on CLK rising edges.
It supports READ (20-clock-cycle), WRITE (20-clock-cycle), ERASE (12-clock-cycle), ERAL (12-clock-cycle), WRAL (20-clock-cycle), EWEN/EWDS instructions. Ready/Busy status is polled via DO during programming; DO enters High-Z when CS goes low or after status read completion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8-bit) - fixed 8-bit word width, no ORG pin required |
| Supply voltage | 1.8 V to 5.5 V - supports wide-range low-power and legacy 5 V systems |
| Endurance | 1,000,000 erase/write cycles - ensures long-term field reliability for frequent updates |
| Data retention | 200 years at 25°C - suitable for permanent configuration storage without refresh |
| Write cycle time | 6 ms typical - self-timed; no external delay needed after CS fall |
| Max clock frequency | 3 MHz at VCC ≥ 4.5 V - defines maximum serial throughput for host MCU |
| Operating temperature | −40°C to +85°C (Industrial grade) - validated for industrial control and automotive cabin modules |
Pinout & Package
Package: 8-lead SOIC (SN), Pb-free Matte Tin finish, body size 3.9 mm × 4.9 mm, standard JEDEC MS-012AC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; initiates self-timed write on falling edge |
| 2 CLK | Serial Clock | Synchronizes all data transfers; rising edge clocks in/out bits; stoppable mid-sequence |
| 3 DI | Data Input | Accepts start bit, opcode, address, and write data; tied to DO only with series resistor to avoid bus conflict |
| 4 DO | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS fall or after status read |
| 5 VSS | Ground | Reference return path for all I/O and core logic; decoupling capacitor required near pin |
| 6 NC | No Connection | Internally unconnected; must be left floating or tied to VSS per layout best practice |
| 7 NC | No Connection | Internally unconnected; same handling as Pin 6 |
| 8 VCC | Power Supply | 1.8–5.5 V input; internal POR triggers at ~1.5 V; must be ≥4.5 V for ERAL/WRAL operations |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or polling delays beyond DO status check |
| Automatic ERAL before WRAL | Guarantees full-array readiness prior to bulk write - prevents partial-write corruption |
| Power-on/off data protection | Hardware-level lockout below 1.5 V VCC - prevents inadvertent writes during brown-out |
| Ready/Busy status on DO | Enables non-blocking host firmware design - CPU polls DO instead of fixed delays |
| Microwire-compatible interface | Direct integration with legacy microcontrollers supporting Microwire (e.g., PIC, MSP430) |
Applications
| Industrial Sensor Calibration | Embedded System Configuration |
|---|---|
Use Scenario: Storing factory-calibrated offset/gain coefficients for analog sensor front-ends in PLC I/O modules. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with infrequent writes and high-read reliability; accessed via SPI-like Microwire during boot or maintenance mode. Use Value: Enables field-replaceable sensors without recalibration; 200-year retention ensures lifetime data integrity across product service life. | Use Scenario: Holding user-defined settings (network IP, display brightness, alarm thresholds) in HVAC controllers. IC Role / Device Role / Timing Role: Serial configuration memory interfaced to main MCU over 3-wire bus; updated only on menu save or reset. Use Value: Survives power loss and cold resets; 1M endurance supports >10 years of daily setting changes at 300 cycles/year. |
| Automotive Body Control Module | Medical Device Usage Logs |
Use Scenario: Recording door lock actuation history and mirror position presets in automotive BCMs operating at −40°C to +85°C. IC Role / Device Role / Timing Role: Industrial-grade EEPROM storing event counters and user preferences; accessed during wake-up or diagnostics. Use Value: Qualified for extended temperature range; 1.8 V operation enables direct connection to low-voltage CAN/LIN subsystems. | Use Scenario: Logging timestamped usage events (e.g., therapy session starts/stops) in portable diagnostic devices. IC Role / Device Role / Timing Role: Tamper-resistant audit trail storage; written sequentially with timestamps; read only during service upload. Use Value: Data retention exceeds regulatory 10-year medical record requirements; no battery backup needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66A-I/SN | VCC range 2.5–5.5 V; same 512×8 organization and SOIC-8 package | Not rated for 1.8 V operation - unsuitable for ultra-low-power or mixed-voltage designs | Select if system VCC is guaranteed ≥2.5 V and higher immunity to VCC noise is required |
| AT25040B-MAU-10 | 4 Kbit SPI interface (4-wire), 1.8–5.5 V, 20 MHz max clock, 1 M endurance | Requires separate /CS, SCK, SI, SO lines - different pinout and protocol stack overhead | Choose for higher-speed SPI-based systems where Microwire legacy support is not required |
Compared with 93LC66A-I/SN, the 93AA66AX-I/SN extends low-voltage operation down to 1.8 V while retaining identical pinout and instruction set; versus AT25040B-MAU-10, it offers Microwire compatibility and simpler 3-wire wiring but lower maximum clock rate.
Availability
93AA66AX-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, and automotive body control modules requiring stable component supply across extended temperature ranges and multi-decade data retention.
Supply support for 93AA66AX-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, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93XX series EEPROMs were designed for cost-sensitive, low-power embedded systems needing reliable nonvolatile storage with minimal pin count and legacy Microwire compatibility - especially in industrial, automotive, and consumer applications.
FAQ
What is the memory organization of the 93AA66AX-I/SN?
The 93AA66AX-I/SN has a fixed 512 × 8-bit organization (4 Kbit total), with no ORG pin - unlike 'C' variants. This means it operates exclusively in x8 mode, accepting 8-bit data per address and requiring 9-bit addresses (A8–A0) for full array access. The absence of ORG simplifies PCB layout and firmware initialization.
Does the 93AA66AX-I/SN require an external pull-up resistor on the DO pin?
No, the 93AA66AX-I/SN does not require an external pull-up on DO. The DO pin actively drives high/low during READ or Ready/Busy status reporting and enters High-Z when inactive. However, if DI and DO are shorted (shared bus), a series resistor (typically 1–10 kΩ) is mandatory to prevent bus conflict during the dummy zero phase of READ.
Can the 93AA66AX-I/SN operate at 1.8 V and still perform ERAL or WRAL commands?
No. Although the 93AA66AX-I/SN operates down to 1.8 V for READ and standard WRITE, ERAL and WRAL commands require VCC ≥ 4.5 V per DS21795E-page 8 and page 11. Attempting these commands below 4.5 V will result in incomplete or failed execution - firmware must verify VCC level before issuing ERAL/WRAL.
How is data protection implemented in the 93AA66AX-I/SN during power transitions?
The 93AA66AX-I/SN uses hardware-based power-on/off protection: internal circuitry inhibits all write operations when VCC falls below ~1.5 V (typical). Additionally, it powers up in EWDS (Erase/Write Disable) mode, requiring an explicit EWEN command before any ERASE or WRITE. This dual-layer protection prevents corruption during brown-out or cold-start sequences.
Is the 93AA66AX-I/SN pin-compatible with other 93XX66 family members in SOIC-8 package?
Yes - the 93AA66AX-I/SN shares identical SOIC-8 pinout (SN) with all 93XX66A/B/C variants in the same package, including 93LC66A-I/SN and 93C66A-I/SN. Pin 1 (CS) through Pin 8 (VCC) map identically. However, functional differences exist: 93C66A requires ≥4.5 V VCC, and 93LC66A lacks 1.8 V support - so electrical compatibility must be verified per application.
93AA66AX-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:
- 512 x 8
- 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
93AA66AX-I/SN FAQ
1.How can I place an order for 93AA66AX-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA66AX-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 93AA66AX-I/SN reliable?
The price and inventory of 93AA66AX-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 93AA66AX-I/SN is usually 5 days.
3.What payment methods are accepted for 93AA66AX-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA66AX-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA66AX-I/SN?
93AA66AX-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA66AX-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 93AA66AX-I/SN?
For technical support, including 93AA66AX-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA66AX-I/SN requirements.
6.How does Aetrix verify that 93AA66AX-I/SN is sourced from the original manufacturer or authorized distributors?
All 93AA66AX-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 93AA66AX-I/SN meets industry standards.
7.What is the process for return or replacement of 93AA66AX-I/SN?
All 93AA66AX-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93AA66AX-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 93AA66AX-I/SN part is unused and in its original packaging.
Return procedure for 93AA66AX-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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