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Microchip Technology 93AA66X/SN
- Part No.:
- 93AA66X/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93AA66X/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,945
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Product details
Overview
93AA66X/SN from Microchip Technology Inc. is a 4K-bit (512 × 8 or 256 × 16) low-voltage serial Microwire 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 at 1.8 V. It features ORG-pin-selectable memory organization, self-timed erase/write cycles, and industry-standard 3-wire serial I/O - deployed in embedded system configuration storage, sensor calibration data retention, and industrial controller parameter backup.
For engineers reviewing the 93AA66X/SN datasheet, 93AA66X/SN pinout, 93AA66X/SN application, or 93AA66X/SN equivalent, this page delivers verified electrical specs, SOIC-8 pin mapping, real-world use cases, and validated alternative parts for legacy design continuity and supply chain resilience.
Technical Context
The 93AA66X/SN implements a synchronous 3-wire Microwire interface with CS, CLK, and bidirectional DI/DO lines, supporting both x8 and x16 memory configurations via the ORG pin. Its internal logic includes address counter, output buffer, mode decode logic, and clock generator - enabling sequential read, ERAL (Erase All), WRAL (Write All), and status polling via DO during programming.
It uses advanced CMOS technology to achieve 1,000,000 erase/write cycles and >200 years of data retention, with power-on/off protection that inhibits programming below 1.4 V. The device enters EWDS (Erase/Write Disable) state at power-up and requires explicit EWEN before any erase or write operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8 or 256 × 16), configurable via ORG pin - enables flexible byte- or word-oriented data storage without external logic. |
| Supply voltage range | 1.8 V to 5.5 V - supports direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without level shifting. |
| Active read current | 70 µA typical at 1.8 V - minimizes power draw in battery-powered sensor nodes and portable instrumentation. |
| Standby current | 2 µA typical at 1.8 V - ensures ultra-low quiescent consumption during system sleep modes. |
| Endurance | 1,000,000 erase/write cycles - guarantees long-term reliability in firmware update logging and field calibration storage. |
| Data retention | >200 years at 25°C - provides permanent nonvolatile storage for critical configuration and calibration data across product lifetime. |
| Max clock frequency | 2 MHz at VCC ≥ 4.5 V; 1 MHz at VCC < 4.5 V - defines maximum SPI-compatible throughput for host MCU timing budgeting. |
Pinout & Package
8-pin SOIC package (JEDEC MS-012, 150 mil body), marked "/SN" per Microchip's packaging nomenclature. Pinout is rotated versus standard 93AA66 (PDIP/SOIC), confirmed for /SN variant only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable signal; must be held low ≥250 ns between instructions to reset internal state and prevent spurious commands. |
| CLK | Serial Clock | Synchronizes all data transfers on rising edge; clock may pause mid-sequence without affecting state - simplifies host timing control. |
| DI | Data Input | Accepts start bit, opcode, address, and write data; tied to DO for 2-wire bus sharing (with caution for A0 conflict). |
| DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); high-Z when inactive - requires pull-up for reliable status polling. |
| VSS | Ground | Reference return path for all digital and analog circuitry; must be low-impedance to ensure stable erase/write timing. |
| ORG | Memory Organization | High = 256 × 16-bit; low = 512 × 8-bit; floating allowed only ≤1 MHz in x16 mode - determines addressing depth and data width. |
| NU | Not Utilized | No internal connection; must be left unconnected - avoids unintended coupling or ESD paths. |
| VCC | Power Supply | 1.8–5.5 V input; internal voltage monitor blocks programming below 1.4 V - prevents corruption during brown-out conditions. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply 1.8 V operation | Enables direct integration into modern ultra-low-power MCUs and IoT edge devices without auxiliary voltage rails. |
| Self-timed erase/write cycles | Eliminates need for external timing control or watchdog supervision - reduces host firmware complexity and interrupt load. |
| Automatic ERAL before WRAL | Guarantees clean memory state prior to bulk write, preventing partial-page corruption without software intervention. |
| Power-on/off data protection | Hardware-enforced lockout below 1.4 V prevents accidental writes during power ramp-up/down - critical for automotive and industrial environments. |
| Sequential read function | Allows continuous burst reads across address boundaries with single CS assertion - improves throughput for block data retrieval. |
Applications
| Industrial Sensor Calibration | Embedded Controller Configuration |
|---|---|
|
Use Scenario: Storing factory-trimmed ADC offset/gain coefficients and temperature compensation tables in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding persistent calibration parameters accessed at boot and during field recalibration. Use Value: Ensures measurement accuracy over temperature and time without requiring external NVRAM or battery-backed RAM. |
Use Scenario: Retaining user-defined I/O mapping, communication protocol settings, and alarm thresholds in HVAC control panels. IC Role / Device Role / Timing Role: System parameter store updated infrequently but read at every power cycle and runtime query. Use Value: Enables field customization and firmware-independent configuration persistence across reboots and updates. |
| Medical Device Settings Backup | Consumer Appliance State Memory |
|
Use Scenario: Saving therapy parameters, usage logs, and safety lockout states in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Secure, low-power data vault for regulatory-compliant operational history and user preferences. Use Value: Meets IEC 62304 data integrity requirements with 1M-cycle endurance and 200-year retention for audit trails. |
Use Scenario: Maintaining cooking program selections, timer presets, and child-lock status in smart ovens and washing machines. IC Role / Device Role / Timing Role: Human-interface state keeper updated on button press and restored after AC power loss. Use Value: Delivers seamless user experience with zero-config recovery, even after extended mains interruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93AA66C/SN | Pin-compatible revision with enhanced ESD rating (6 kV vs. 4 kV) and updated qualification; same 4K-bit capacity and SOIC-8 /SN footprint. | Preferred for new designs requiring higher robustness in noisy industrial environments or automated assembly lines. | Select 93AA66C/SN when designing new products - it supersedes 93AA66X/SN and offers improved reliability without layout change. |
| AT25040B-MAU-1.8 | 4 Kbit SPI EEPROM (not Microwire); supports 1.8 V operation, 5 MHz max clock, and 100-year retention - differs in instruction set and status reporting. | Suitable where SPI-native host interfaces exist and Microwire protocol compatibility is not required. | Choose AT25040B-MAU-1.8 only if migrating from Microwire to SPI architecture; verify firmware rewrite for command timing and status polling. |
Compared with 93AA66X/SN, the 93AA66C/SN offers identical functionality with stronger ESD immunity and lifecycle support, while AT25040B-MAU-1.8 trades Microwire compatibility for faster SPI throughput and broader vendor availability - making it viable only with interface redesign.
Availability
93AA66X/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded controller configuration, and medical device settings backup requiring stable component supply across extended production lifecycles.
Supply support for 93AA66X/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 solutions for embedded systems.
The 93AA66X/SN belongs to Microchip's legacy Microwire EEPROM product line, designed specifically for low-voltage, low-power nonvolatile data storage in resource-constrained microcontroller peripherals and industrial control subsystems.
FAQ
What is the memory organization of the 93AA66X/SN and how is it selected?
The 93AA66X/SN supports two memory organizations: 512 × 8-bit (x8) or 256 × 16-bit (x16), selected by the ORG pin. When ORG is tied to VCC, the x16 mode activates; when tied to VSS, x8 mode is used. Floating ORG is permitted only at clock frequencies ≤1 MHz in x16 mode. This flexibility allows the 93AA66X/SN to match host processor data bus width without external glue logic.
Does the 93AA66X/SN require external circuitry for power-supply monitoring during write operations?
No - the 93AA66X/SN includes integrated power-on/off data protection that automatically inhibits erase/write functions when VCC falls below 1.4 V or rises above that threshold during startup. This hardware feature eliminates the need for external voltage supervisors or brown-out detectors, reducing BOM count and PCB area for the 93AA66X/SN in cost-sensitive designs.
Can the 93AA66X/SN be used in a 2-wire bus configuration with shared DI/DO lines?
Yes, the 93AA66X/SN supports DI/DO bus sharing, but caution is required: a "bus conflict" may occur during the dummy-zero phase of READ if A0 is high, causing undefined DO voltage. For reliable operation, use separate DI/DO lines or ensure strong pull-down on A0 when sharing. This behavior is documented in the 93AA66X/SN functional description and affects timing-critical host implementations.
What is the guaranteed endurance and data retention specification for the 93AA66X/SN?
The 93AA66X/SN is specified for 1,000,000 erase/write cycles and >200 years of data retention at 25°C. These values are ensured through characterization (not 100% tested) and apply under nominal operating conditions (VCC = 5.0 V, TA = 25°C). Real-world retention may vary with temperature and voltage stress, but the 93AA66X/SN remains qualified for long-life applications such as medical device calibration storage.
Is the 93AA66X/SN pin-compatible with other members of the 93AAxx family in SOIC-8 packages?
No - the 93AA66X/SN uses a rotated pinout specific to the /SN package variant and is not pin-compatible with standard 93AA66 (PDIP or non-X SOIC). The rotated layout places ORG at pin 5 and NU at pin 6, differing from the conventional SOIC pin mapping. This distinction is explicitly noted in Microchip's DS20067K datasheet and must be verified before PCB reuse.
93AA66X/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, 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
93AA66X/SN FAQ
1.How can I place an order for 93AA66X/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA66X/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 93AA66X/SN reliable?
The price and inventory of 93AA66X/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93AA66X/SN is usually 5 days.
3.What payment methods are accepted for 93AA66X/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA66X/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA66X/SN?
93AA66X/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA66X/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 93AA66X/SN?
For technical support, including 93AA66X/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA66X/SN requirements.
6.How does Aetrix verify that 93AA66X/SN is sourced from the original manufacturer or authorized distributors?
All 93AA66X/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 93AA66X/SN meets industry standards.
7.What is the process for return or replacement of 93AA66X/SN?
All 93AA66X/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93AA66X/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 93AA66X/SN part is unused and in its original packaging.
Return procedure for 93AA66X/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93AA66X/SN Tags
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