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Microchip Technology 93AA66BT-I/SN
- Part No.:
- 93AA66BT-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93AA66BT-I/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,496
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Product details
Overview
93AA66BT-I/SN from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with 512 × 8-bit organization, Microwire-compatible 3-wire interface (CS/CLK/DI/DO), and industrial temperature range (–40°C to +85°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and 1,000,000 endurance cycles - used for configuration storage in embedded controllers and sensor calibration registers.
For engineers reviewing the 93AA66BT-I/SN datasheet, 93AA66BT-I/SN pinout, 93AA66BT-I/SN application, or 93AA66BT-I/SN equivalent, key selection criteria include VCC range (1.8–5.5 V), SOIC-8 package compatibility, Ready/Busy status via DO pin, and support for sequential read and WRAL/ERAL commands in resource-constrained systems.
Technical Context
The 93AA66BT-I/SN implements a synchronous serial Microwire protocol with start-bit detection, opcode-driven instruction set (READ/ WRITE/ERASE/WRAL/ERAL/EWEN/EWDS), and dual-mode memory access: dedicated 8-bit organization (no ORG pin function). Its internal logic includes address counter, mode decode, and output buffer with High-Z control on DO during standby and non-read states.
It uses CMOS EEPROM cell technology with auto-erase-before-write architecture, requiring EWEN command prior to any programming operation and supporting status polling via DO pin after minimum TCSL (250 ns) CS low time. Power-on reset circuitry disables write functions until VCC exceeds 1.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8-bit), fixed x8 organization - no ORG pin required, simplifies PCB layout vs. C-version devices |
| VCC range | 1.8 V to 5.5 V - supports single-supply operation across 1.8 V microcontrollers and 5 V legacy systems |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - minimal GPIO usage, no SPI mode bits or chip-select arbitration needed |
| Write endurance | 1,000,000 erase/write cycles - enables frequent recalibration or logging in industrial monitoring applications |
| Data retention | >200 years at +25°C - ensures long-term reliability for firmware parameter storage without refresh |
| Operating temp | –40°C to +85°C (Industrial grade) - qualified for use in motor drives, PLC I/O modules, and outdoor metering |
| Max clock frequency | 3 MHz at VCC ≥ 4.5 V - allows fast configuration load during boot without CPU wait states |
Pinout & Package
93AA66BT-I/SN is packaged in 8-lead SOIC (SN), with standard pinout matching industry Microwire EEPROMs. Pin 1 is CS, Pin 2 is CLK, Pin 3 is DI, Pin 4 is DO, Pin 5 is VSS, Pin 6 is NC (no internal connection - not ORG), Pin 7 is NC, Pin 8 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select | Active-high enable; device enters Standby mode when low, but completes ongoing write cycle - critical for power-aware sequencing |
| CLK (Pin 2) | Serial Clock | Synchronizes all data transfers on rising edge; clock can be paused mid-transfer - simplifies timing-critical host firmware |
| DI (Pin 3) | Data Input | Receives start bit, opcodes, addresses, and write data; must be stable before first CLK rising edge after CS high |
| DO (Pin 4) | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z when CS low or during non-read operations |
| VSS (Pin 5) | Ground | Reference for all input thresholds and output drive - requires low-impedance connection to minimize noise coupling |
| NC (Pin 6) | No Connection | Not bonded internally; must be left unconnected or tied to VSS per layout best practice - no ORG function on A/B variants |
| NC (Pin 7) | No Connection | Not bonded internally; floating or grounded - avoids unintended signal coupling in dense layouts |
| VCC (Pin 8) | Power Supply | Supplies core logic and memory array; internal POR triggers at ~1.5 V - ensures data integrity during brown-out |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing control - reduces host MCU overhead and eliminates need for fixed delay loops |
| Automatic ERAL before WRAL | Guarantees full-array readiness before bulk write - prevents partial writes and data corruption in firmware update routines |
| Power-on/off data protection | Hardware lockout below 1.5 V VCC - prevents inadvertent writes during power ramp-up/down in battery-backed systems |
| Ready/Busy status on DO | Enables efficient polling instead of fixed delays - improves system responsiveness and reduces average write latency |
| Sequential read mode | Continuous data stream with auto-incremented address - accelerates full-memory dump for diagnostics or backup |
Applications
| Industrial Sensor Calibration | Embedded Controller Configuration |
|---|---|
Use Scenario: Storing factory-trimmed offset/gain coefficients for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter store accessed during power-up initialization; read-only during runtime. Use Value: Enables field-replaceable sensor modules with unique calibration data retained across 200+ years - eliminating re-trimming labor. | Use Scenario: Holding user-defined I/O mapping, communication baud rates, and alarm thresholds in HVAC controller firmware. IC Role / Device Role / Timing Role: Configuration register bank updated infrequently via service port; read at boot and cached in RAM. Use Value: Supports over-the-air updates without requiring flash reprogramming - preserves main MCU flash endurance. |
| Medical Device Settings Storage | Automotive Body Control Module |
Use Scenario: Retaining patient-specific therapy parameters and usage logs in portable infusion pumps. IC Role / Device Role / Timing Role: Secure, low-power memory accessed only during setup or maintenance mode; isolated from real-time control path. Use Value: Meets IEC 62304 data integrity requirements with 1M-cycle endurance - withstands daily clinical recalibration. | Use Scenario: Storing door lock actuator calibration points and lighting dimming profiles in vehicle BCMs. IC Role / Device Role / Timing Role: EEPROM accessed during ignition-on sequence; write operations occur only during service mode or learning cycles. Use Value: Industrial-grade temp rating (–40°C to +85°C) ensures reliable operation under hood ambient extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66BT-I/SN | VCC range 2.5–5.5 V; identical pinout, timing, and instruction set - lacks 1.8 V operation | Not suitable for 1.8 V microcontroller interfaces; otherwise drop-in for 3.3 V/5 V systems | Select when system VCC ≥ 2.5 V and lower voltage operation is unnecessary |
| AT25040B-MAHL-T | SPI interface (4-wire), 4 Kbit (512 × 8), 1.8–5.5 V, 20 MHz max clock - different protocol, no Ready/Busy pin | Requires SPI peripheral and software polling via status register; no DO-based hardware status | Choose when existing design uses SPI peripherals and higher throughput is needed |
Compared with 93LC66BT-I/SN, the 93AA66BT-I/SN adds 1.8 V operation for ultra-low-power systems; compared with AT25040B-MAHL-T, it offers simpler timing via DO status but lower maximum clock rate and Microwire-only compatibility.
Availability
93AA66BT-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded controller configuration, and medical device settings storage requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for 93AA66BT-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 manufacturing and support infrastructure.
The 93XX66 series was designed specifically for cost-sensitive, low-power nonvolatile memory applications in industrial, automotive, and consumer systems - emphasizing simplicity, reliability, and broad voltage operation.
FAQ
What is the memory organization of the 93AA66BT-I/SN?
The 93AA66BT-I/SN has a fixed 512 × 8-bit (4 Kbit) organization with no ORG pin functionality. Unlike the 'C' variants, it does not support x16 mode - all instructions and data transfers operate strictly in 8-bit format. This simplifies interface design by eliminating external ORG pin routing and level-setting logic.
Does the 93AA66BT-I/SN require an EWEN command before every write operation?
Yes, the 93AA66BT-I/SN powers up in Erase/Write Disable (EWDS) mode. An EWEN command must be issued before any ERASE, WRITE, WRAL, or ERAL instruction. After successful programming, executing EWDS restores protection - a recommended practice to prevent accidental writes during normal operation.
What is the purpose of the NC pins on the 93AA66BT-I/SN SOIC package?
Pins 6 and 7 on the 93AA66BT-I/SN are No Connect (NC) terminals - they have no internal bond wire or circuit connection. Per Microchip's design guidance, these pins may be left floating or tied to VSS for mechanical stability; they must never be driven or used as signal paths to avoid parasitic coupling or ESD risks.
Can the 93AA66BT-I/SN be used with a 1.8 V microcontroller?
Yes, the 93AA66BT-I/SN supports VCC from 1.8 V to 5.5 V and is fully specified for DC and AC operation at 1.8 V, including valid VIH/VIL thresholds and 1 MHz clock capability. This makes it compatible with modern ultra-low-power MCUs such as PIC16LF1xxx or ARM Cortex-M0+ derivatives operating at 1.8 V.
How is Ready/Busy status monitored on the 93AA66BT-I/SN?
Ready/Busy status is monitored on the DO pin: after initiating an erase or write command, bring CS high for ≥250 ns (TCSL), then sample DO - low indicates ongoing operation, high indicates completion. Issuing a new Start bit followed by CS low clears the status flag, enabling immediate re-polling.
93AA66BT-I/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:
- 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
93AA66BT-I/SN FAQ
1.How can I place an order for 93AA66BT-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA66BT-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 93AA66BT-I/SN reliable?
The price and inventory of 93AA66BT-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 93AA66BT-I/SN is usually 5 days.
3.What payment methods are accepted for 93AA66BT-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA66BT-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA66BT-I/SN?
93AA66BT-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA66BT-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 93AA66BT-I/SN?
For technical support, including 93AA66BT-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA66BT-I/SN requirements.
6.How does Aetrix verify that 93AA66BT-I/SN is sourced from the original manufacturer or authorized distributors?
All 93AA66BT-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 93AA66BT-I/SN meets industry standards.
7.What is the process for return or replacement of 93AA66BT-I/SN?
All 93AA66BT-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93AA66BT-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 93AA66BT-I/SN part is unused and in its original packaging.
Return procedure for 93AA66BT-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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