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Microchip Technology 93AA66XT/SN
- Part No.:
- 93AA66XT/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93AA66XT/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,196
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Product details
Overview
93AA66XT/SN from Microchip Technology Inc. is a 4K-bit (512 × 8 or 256 × 16) low-voltage Microwire-compatible serial EEPROM with single-supply operation down to 1.8 V, 70 µA typical active read current at 1.8 V, and 2 µA standby current - used for nonvolatile parameter storage in battery-powered instrumentation, industrial sensors, and embedded control modules.
For engineers reviewing the 93AA66XT/SN datasheet, 93AA66XT/SN pinout, 93AA66XT/SN application, or 93AA66XT/SN equivalent, key selection criteria include its 1.8–5.5 V operating range, ORG-pin-selectable memory organization, self-timed erase/write cycles, and SOIC-8 (SN) package compatibility with JEDEC/ EIAJ standards.
Technical Context
The 93AA66XT/SN implements a 3-wire Microwire serial interface (CS, CLK, DI/DO) with synchronous read/write/erase operations clocked on the rising edge of CLK. Its dual-memory organization (x8 or x16) is selected via the ORG pin, enabling flexible byte- or word-oriented data access without external logic.
Internal power-on/off protection inhibits programming below 1.4 V, and EWEN/EWDS commands enforce explicit write-enable control. Device status (RDY/BSY) is reported via DO during erase/write cycles, supporting polling-based firmware synchronization without dedicated interrupt lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8 or 256 × 16), enabling compact configuration storage for microcontrollers with limited internal NVM |
| Supply voltage | 1.8 V to 5.5 V - supports direct integration into 1.8 V, 3.3 V, and 5 V systems without level-shifting |
| Active read current | 70 µA at 1.8 V - minimizes battery drain in always-on sensor nodes and portable devices |
| Standby current | 2 µA at 1.8 V - ensures multi-year operation on coin-cell batteries in maintenance-free deployments |
| Endurance | 1,000,000 erase/write cycles - suitable for frequent calibration or logging applications |
| Data retention | >200 years at 25°C - guarantees long-term reliability in unattended infrastructure monitoring |
| Max clock frequency | 2 MHz at VCC ≥ 4.5 V; 1 MHz at lower VCC - defines maximum throughput for firmware-initiated updates |
Pinout & Package
8-pin SOIC package per JEDEC MS-012 and EIAJ standards (body width 150 mil / 3.91 mm), marked "/SN" per Microchip's packaging nomenclature. Pin 1 is CS, with rotated pinout relative to PDIP - confirmed for 93AA66X-series variants including 93AA66XT/SN.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions to reset internal state |
| CLK | Serial Clock | Rising-edge synchronized I/O; clocking may pause mid-transfer without loss of state |
| DI | Data Input | Accepts Start bit, opcode, address, and write data; supports shared bus with DO under controlled conditions |
| DO | Data Output / Status | Outputs read data or RDY/BSY status (low = busy); high-Z when inactive - requires pull-up for reliable status reads |
| VSS | Ground | Reference for all digital and analog circuitry; must be low-impedance connection to minimize noise coupling |
| ORG | Memory Organization | Connect to VCC for 256 × 16 mode; to VSS for 512 × 8 mode; floating only allowed ≤1 MHz in x16 mode |
| NU | Not Utilized | No internal connection; must be left unconnected or tied to VSS/VCC per board layout best practices |
| VCC | Power Supply | 1.8–5.5 V input with built-in power-on/off protection; decoupling capacitor required within 10 mm |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply 1.8 V operation | Enables direct interfacing with ultra-low-power MCUs (e.g., PIC12LF, MSP430FR) without voltage translation |
| Self-timed erase/write cycles | Eliminates need for external timing control or firmware delay loops - WRAL completes in 16 ms typical |
| ORG-pin memory configuration | Allows runtime selection between byte- and word-access modes, reducing software overhead in mixed-data-size systems |
| Power-on/off data protection | Hardware-enforced lockout below 1.4 V prevents corruption during brown-out or hot-swap events |
| Industry-standard 3-wire interface | Reduces PCB routing complexity vs. SPI/I²C; compatible with legacy Microwire controllers and FPGA soft peripherals |
Applications
| Industrial Sensor Calibration | Medical Device Configuration Storage |
|---|---|
Use Scenario: Storing factory-calibrated gain/offset coefficients and user-adjusted thresholds in temperature/humidity transmitters. IC Role / Device Role / Timing Role: Nonvolatile parameter register accessed during boot and field recalibration; no real-time timing constraints. Use Value: Maintains accuracy across power cycles and battery replacements; 2 µA standby current extends field service life beyond 10 years. | Use Scenario: Holding patient-specific therapy settings and device serialization data in portable infusion pumps. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration store; accessed during initialization and safety-critical mode transitions. Use Value: 1M endurance supports daily recalibration logs; >200-year data retention meets ISO 13485 long-term record requirements. |
| Automotive Body Control Module | Smart Energy Meter Firmware Patch Storage |
Use Scenario: Saving seat/mirror position presets and lighting profiles in 12 V vehicle subsystems with wide-input DC-DC regulation. IC Role / Device Role / Timing Role: Low-voltage auxiliary NVM; interfaces with 3.3 V MCU over Microwire at ≤1 MHz during ignition-off state. Use Value: 1.8 V min supply allows operation during cold-crank (down to ~6 V battery), preserving user preferences even during deep discharge. | Use Scenario: Storing firmware patch images and cryptographic keys for secure over-the-air (OTA) updates in utility-grade meters. IC Role / Device Role / Timing Role: Trusted code repository; accessed only during authenticated update sequences with hardware write-protection enabled. Use Value: EWEN/EWDS command lockout prevents accidental overwrite; 4 ms per-word write time enables fast patch deployment without system downtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93AA66C-I/SN | Same 4K-bit Microwire EEPROM but with updated C-grade silicon; improved AC timing specs and enhanced ESD robustness (4 kV HBM) | Recommended for new designs per Microchip's notice; supports same ORG-selectable configurations and pinout | Select 93AA66C-I/SN for production releases requiring full lifecycle support and documented reliability improvements |
| AT25040B-MAU-2.7 | SPI interface (not Microwire), 4 Kbit capacity, 2.7–5.5 V supply, 5 MHz max clock; lacks ORG pin and sequential read mode | Requires SPI-capable host controller; no hardware-configurable x8/x16 mode - fixed 512 × 8 organization | Choose AT25040B-MAU-2.7 only if migrating from SPI-based designs and accepting software-level organization management |
Compared with 93AA66XT/SN, the 93AA66C-I/SN offers verified longevity and tighter timing margins for high-volume manufacturing, while the AT25040B-MAU-2.7 trades Microwire compatibility for higher-speed SPI access - neither is pin-compatible, and both require firmware adaptation for instruction set and status polling.
Availability
93AA66XT/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration storage, and automotive body control modules requiring stable component supply across extended product lifecycles.
Supply support for 93AA66XT/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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory products for embedded control applications.
The 93AA66XT/SN belongs to Microchip's legacy Microwire EEPROM product line, designed specifically for cost-sensitive, low-power systems needing simple, robust nonvolatile storage with minimal pin count and firmware overhead.
FAQ
What is the memory organization flexibility of the 93AA66XT/SN?
The 93AA66XT/SN supports two memory configurations via the ORG pin: 512 × 8-bit (ORG = VSS) or 256 × 16-bit (ORG = VCC). This allows firmware to optimize data access patterns - byte-oriented for ASCII strings or word-aligned for 16-bit calibration values - without changing hardware. The 93AA66XT/SN does not support dynamic reconfiguration; ORG must be set at power-up and held stable during operation.
Does the 93AA66XT/SN require external voltage translation when interfaced with a 3.3 V microcontroller?
No, the 93AA66XT/SN operates natively from 1.8 V to 5.5 V, making it fully compatible with 3.3 V I/O domains without level shifters. Its VIH2 threshold (0.7 × VCC) and VOL2 spec (≤0.2 V at 100 µA) ensure reliable logic recognition and drive strength at 3.3 V. The 93AA66XT/SN's 70 µA active current at 1.8 V also supports direct use in mixed-voltage systems where the MCU runs at lower core voltages.
How is write protection implemented on the 93AA66XT/SN?
Write protection on the 93AA66XT/SN uses a two-stage hardware/software mechanism: power-on default is Erase/Write Disable (EWDS) mode, and an explicit EWEN instruction must precede any ERASE or WRITE command. After programming, issuing EWDS restores protection. This prevents accidental writes during noise events or firmware glitches. The 93AA66XT/SN does not support block locking or software write-protect bits - protection is global and command-gated.
What is the significance of the "T" and "SN" suffixes in 93AA66XT/SN?
In Microchip's part numbering, "T" denotes tape-and-reel packaging for automated assembly, while "SN" specifies the 8-pin narrow SOIC package (150 mil body width, JEDEC MS-012 compliant). The "X" in 93AA66XT/SN indicates the rotated pinout variant - confirmed in DS20067K as exclusive to SN packages. Thus, 93AA66XT/SN is the tape-and-reel version of the rotated-pin SOIC-8 4K Microwire EEPROM.
Can the 93AA66XT/SN be used in commercial-temperature applications?
Yes, the 93AA66XT/SN is rated for the commercial temperature range (0°C to +70°C) unless otherwise specified by a temperature suffix. The base part number without "I" (industrial) or "E" (extended) implies commercial grade. Its electrical characteristics - including 70 µA read current and 2 µA standby - are guaranteed across this range per DS20067K Table 1-1. For operation beyond +70°C, the 93AA66XT/SNI variant must be selected.
93AA66XT/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:
- 512 x 8, 256 x 16
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 10ms
- Access Time:
- -
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
93AA66XT/SN FAQ
1.How can I place an order for 93AA66XT/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA66XT/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 93AA66XT/SN reliable?
The price and inventory of 93AA66XT/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93AA66XT/SN is usually 5 days.
3.What payment methods are accepted for 93AA66XT/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA66XT/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA66XT/SN?
93AA66XT/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA66XT/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 93AA66XT/SN?
For technical support, including 93AA66XT/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA66XT/SN requirements.
6.How does Aetrix verify that 93AA66XT/SN is sourced from the original manufacturer or authorized distributors?
All 93AA66XT/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 93AA66XT/SN meets industry standards.
7.What is the process for return or replacement of 93AA66XT/SN?
All 93AA66XT/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93AA66XT/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 93AA66XT/SN part is unused and in its original packaging.
Return procedure for 93AA66XT/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93AA66XT/SN Tags
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