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Microchip Technology 93AA66T/SN
- Part No.:
- 93AA66T/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93AA66T/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,012
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Product details
Overview
93AA66T/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 sensors, industrial control modules, and embedded system configuration memory.
For engineers reviewing the 93AA66T/SN datasheet, 93AA66T/SN pinout, 93AA66T/SN application, or 93AA66T/SN equivalent, key selection criteria include its ORG-pin-selectable x8/x16 memory organization, self-timed 4 ms per-word write/erase cycles, 1,000,000 endurance rating, and SOIC-8 (SN) package compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
The 93AA66T/SN implements a synchronous 3-wire Microwire interface (CS, CLK, DI/DO) with start-bit detection and opcode-driven command set including READ, WRITE, ERASE, ERAL, WRAL, EWEN, and EWDS. Its internal logic supports automatic ERAL before WRAL and power-on/off data protection via voltage threshold monitoring at 1.4 V.
Memory organization is dynamically selected by the ORG pin: tied to VCC enables 256 × 16-bit mode (16-bit data width), tied to VSS enables 512 × 8-bit mode (8-bit data width); floating ORG is permitted only ≤1 MHz in x16 mode. DO provides both serial data output and Ready/Busy status polling during programming cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8 or 256 × 16), enabling compact firmware parameter or calibration data storage |
| Supply voltage range | 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 typical at 1.8 V - minimizes battery drain in always-on sensor nodes |
| Standby current | 2 µA typical at 1.8 V - ensures multi-year operation on coin-cell batteries |
| Write/erase endurance | 1,000,000 cycles - suitable for frequent field-updatable configuration registers |
| Data retention | 200 years at 25°C - guarantees long-term reliability in unattended infrastructure equipment |
| Max clock frequency | 2 MHz at VCC ≥ 4.5 V; 1 MHz at lower voltages - balances speed and low-power operation |
| Operating temperature | –40°C to +85°C (Industrial grade) - validated for deployment in factory automation and outdoor metering |
Pinout & Package
8-pin SOIC package (JEDEC MS-012, "SN" designation), 150 mil body width, surface-mount compatible with standard reflow profiles.
| 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 |
| CLK | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data; stoppable mid-sequence |
| DI | Data Input | Accepts start bit, instruction opcodes, addresses, and write data; shares net with DO in bidirectional configurations |
| DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); high-Z when inactive; requires pull-up for reliable status reads |
| VSS | Ground | Reference return path for all I/O and core logic; must be low-impedance for stable timing |
| ORG | Memory Organization | Selects 512×8 (VSS) or 256×16 (VCC) mode; not usable floating above 1 MHz in x16 mode |
| NU | No Connect | Internally unused pin; must remain unconnected or tied to VSS/VCC per PCB layout best practices |
| VCC | Power Supply | Single supply input; powers logic and memory array; includes on-chip voltage monitor for 1.4 V power-up/down protection |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing components; 4 ms per word, 8 ms ERAL, 16 ms WRAL - simplifies host firmware timing logic |
| Auto-ERAL before WRAL | Guarantees full-array readiness before bulk write; removes need for explicit ERAL command in initialization sequences |
| Power-on/off data protection | Hardware-enforced lockout below 1.4 V prevents corruption during brown-out or hot-swap events |
| Sequential read mode | Enables continuous address increment with CS held high - reduces transaction overhead for block reads |
| EWEN/EWDS security control | Explicit enable/disable of programming functions prevents accidental writes during normal operation or noise transients |
| 3-wire Microwire interface | Minimal pin count and protocol simplicity - ideal for microcontrollers with limited GPIO or SPI peripherals |
Applications
| Smart Energy Meters | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Storing tariff schedules, meter calibration constants, and tamper-event logs in utility-grade electricity meters. IC Role / Device Role / Timing Role: Nonvolatile configuration and event logging memory interfaced to an 8-bit MCU via Microwire. Use Value: 200-year data retention and 1M endurance ensure compliance with ANSI C12.20 and IEC 62056 standards over 20+ year field life. | Use Scenario: Holding module identification codes, channel scaling factors, and fault history in DIN-rail mounted analog input/output expansion units. IC Role / Device Role / Timing Role: Parameter storage peripheral accessed during boot and runtime by ARM Cortex-M4-based controller. Use Value: –40°C to +85°C operation and 1.8 V compatibility allow direct integration into wide-temperature industrial backplanes without auxiliary regulators. |
| Medical Diagnostic Sensors | Automotive Body Control Units |
Use Scenario: Retaining sensor offset/gain coefficients and patient-specific calibration profiles in portable ECG or pulse oximeter devices. IC Role / Device Role / Timing Role: Low-power configuration memory connected to ultra-low-power MSP430 MCU via software-bitbanged Microwire. Use Value: 2 µA standby current extends single-use battery life beyond 5 years while maintaining FDA-required traceability data integrity. | Use Scenario: Storing door lock actuator calibration points, seat position presets, and lighting dimming curves in vehicle interior control modules. IC Role / Device Role / Timing Role: EEPROM for infrequent but critical nonvolatile storage, accessed during ignition-on initialization. Use Value: Built-in power-loss protection and 1.8 V operation enable direct connection to automotive 2.5 V or 3.3 V domain supplies without additional LDOs. |
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 HBM vs. 4 kV) and updated process; same pinout, timing, and instruction set | Recommended for new designs per Microchip's DS20067K-page 1 note; identical functional behavior in legacy systems | Select 93AA66C/SN for production ramp or replacement where long-term availability and improved robustness are required |
| AT25040B-MAU-1.8 | 4 Kbit SPI EEPROM (not Microwire); supports 10 MHz clock, 2.5–5.5 V supply; no ORG pin - fixed 512×8 organization | Requires SPI-capable host; lacks x16 mode and auto-ERAL; higher speed but less flexible memory mapping | Choose when host already uses SPI peripherals and higher throughput (>1 MHz) is needed; verify firmware compatibility with SPI command set |
Compared with 93AA66T/SN, the 93AA66C/SN offers identical functionality with improved ESD tolerance and official support status, while the AT25040B-MAU-1.8 trades Microwire compatibility and ORG flexibility for faster SPI access and broader voltage range - making it suitable only where interface and memory-width constraints permit.
Availability
93AA66T/SN is available at Aetrix Electronics and suitable for smart energy meters, industrial PLC I/O modules, medical diagnostic sensors, and automotive body control units requiring stable component supply across extended product lifecycles.
Supply support for 93AA66T/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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93AAxx family was designed specifically for low-voltage, low-power serial EEPROM applications in space-constrained and battery-operated systems, emphasizing micropower operation, robust data integrity, and industry-standard Microwire compatibility.
FAQ
What is the memory organization flexibility of the 93AA66T/SN?
The 93AA66T/SN supports dual memory configurations via the ORG pin: when tied to VSS, it operates as 512 × 8-bit (4 Kbit total); when tied to VCC, it configures as 256 × 16-bit. This allows system designers to optimize data bus width and addressing efficiency without changing the 93AA66T/SN hardware. Floating ORG is allowed only at ≤1 MHz in x16 mode per datasheet Section 3.5.
Does the 93AA66T/SN require external timing components for write operations?
No, the 93AA66T/SN features fully self-timed erase and write cycles - including auto-erase - eliminating the need for external capacitors or timers. Typical write time is 4 ms per word, 8 ms for ERAL, and 16 ms for WRAL, all initiated by the falling edge of CS. The host MCU only needs to poll the DO pin for Ready/Busy status.
How does the 93AA66T/SN protect against data corruption during power transitions?
The 93AA66T/SN integrates hardware power-on/power-off protection that inhibits all programming modes until VCC exceeds 1.4 V and locks out writes when VCC falls below 1.4 V. Combined with EWEN/EWDS command gating and automatic ERAL-before-WRAL, this ensures data integrity during brown-outs, hot swaps, or battery insertion - critical for the 93AA66T/SN's use in field-deployed equipment.
Can the 93AA66T/SN be used in a 3.3 V system with a 1.8 V microcontroller?
Yes, the 93AA66T/SN operates across 1.8 V to 5.5 V, so it can share a 3.3 V supply with other peripherals while interfacing to a 1.8 V MCU - provided level translation is applied to CS, CLK, DI, and DO signals. Its VIH/VIL thresholds scale with VCC (e.g., VIH2 = 0.7 × VCC), ensuring reliable logic recognition even with mixed-voltage signaling when properly biased.
Is the 93AA66T/SN still recommended for new designs?
No - Microchip explicitly states "Not recommended for new designs" in DS20067K-page 1 and recommends migrating to the 93AA66C/SN variant. While the 93AA66T/SN remains functional and supported for existing designs, the 93AA66C/SN offers enhanced ESD performance (6 kV HBM), updated process technology, and continued long-term availability - making it the preferred choice for any new 93AA66T/SN-based design.
93AA66T/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:
- 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
93AA66T/SN FAQ
1.How can I place an order for 93AA66T/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA66T/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 93AA66T/SN reliable?
The price and inventory of 93AA66T/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93AA66T/SN is usually 5 days.
3.What payment methods are accepted for 93AA66T/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA66T/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA66T/SN?
93AA66T/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA66T/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 93AA66T/SN?
For technical support, including 93AA66T/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA66T/SN requirements.
6.How does Aetrix verify that 93AA66T/SN is sourced from the original manufacturer or authorized distributors?
All 93AA66T/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 93AA66T/SN meets industry standards.
7.What is the process for return or replacement of 93AA66T/SN?
All 93AA66T/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93AA66T/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 93AA66T/SN part is unused and in its original packaging.
Return procedure for 93AA66T/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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