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Microchip Technology 93AA66BT-I/OT
- Part No.:
- 93AA66BT-I/OT
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- SOT-23-6
- Datasheet:
-
93AA66BT-I/OT.pdf
- Description:
- IC EEPROM 4KBIT MIC WIRE SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:5,604
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Product details
Overview
93AA66BT-I/OT 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 in microcontroller configuration storage and sensor calibration retention.
For engineers reviewing the 93AA66BT-I/OT datasheet, 93AA66BT-I/OT pinout, 93AA66BT-I/OT application, or 93AA66BT-I/OT equivalent, key selection criteria include VCC range (1.8–5.5 V), SOT-23-6 package footprint, 3-wire serial timing compliance, Ready/Busy status via DO pin, and write-protection behavior under EWEN/EWDS control.
Technical Context
This device implements a synchronous serial Microwire protocol with start-bit detection, opcode-driven instruction set (READ/WRIT/ERASE/ERAL/WRAL/EWEN/EWDS), and dual-mode memory access: dedicated 8-bit organization (no ORG pin required) for fixed-width communication. The DO pin serves dual function - data output during READ and Ready/Busy indicator during programming.
Internal architecture includes address decoder, mode decode logic, clock register, and output buffer. Power-on reset circuitry enforces EWDS state until explicit EWEN command; VCC voltage detect threshold is 1.5 V. All operations are initiated by CS high-to-low transition followed by CLK-synchronized bitstream on DI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8-bit), fixed x8 organization - no ORG pin needed; simplifies PCB routing and firmware driver design. |
| VCC range | 1.8 V to 5.5 V - supports direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without level shifters. |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - minimal GPIO usage; no SPI mode bits or chip-select arbitration logic required. |
| Write endurance | 1,000,000 erase/write cycles - suitable for frequent calibration updates or event logging in industrial controllers. |
| Data retention | Greater than 200 years at +25°C - ensures long-term reliability in unattended embedded systems. |
| Operating temp | –40°C to +85°C (Industrial grade) - validated for use in motor drives, HVAC controls, and factory automation equipment. |
| Max clock frequency | 3 MHz at VCC ≥ 4.5 V; 2 MHz at 2.5 V ≤ VCC < 4.5 V - defines maximum throughput for bulk read/write sequences. |
Pinout & Package
SOT-23-6 package (package code OT), 2.9 mm × 1.6 mm footprint, Pb-free Matte Tin finish. Pin 1 marked by laser dot; pin 1 ID corner defined per JEDEC MO-178.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DO) | Data Output / Ready-Busy Indicator | Tri-state output: delivers 8-bit data during READ; asserts low during erase/write to signal busy; high = ready. |
| 2 (VSS) | Ground Reference | Primary return path for all internal logic and I/O; must be connected directly to system ground plane. |
| 3 (DI) | Data Input | Serial input for start bit, opcodes, addresses, and write data; sampled on rising CLK edge. |
| 4 (VCC) | Power Supply | Supplies core logic and memory array; bypass capacitor (0.1 µF) recommended within 5 mm of pin. |
| 5 (CS) | Chip Select | Active-high enable: high selects device; low forces standby mode and resets internal state machine. |
| 6 (CLK) | Serial Clock | Synchronizes all data transfers; rising edge clocks DI input and latches DO output; stoppable mid-transfer. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing control - falling CS edge (93AA/93LC) initiates full auto-erase-and-program cycle; TWC = 6 ms typical. |
| Automatic ERAL before WRAL | Ensures clean memory state prior to full-array write - no separate ERAL command needed, reducing firmware complexity. |
| Power-on/off data protection | Hardware-enforced lockout below VCC = 1.5 V - prevents corruption during brown-out or hot-plug events. |
| EWEN/EWDS write protection | Two-command software lock mechanism - device powers up in EWDS state; explicit EWEN required before any programming. |
| Sequential read capability | Continuous data stream across address boundaries when CS remains high - enables fast dump of configuration blocks. |
Applications
| Motor Control Configuration Storage | Smart Sensor Calibration Data Retention |
|---|---|
Use Scenario: Storing PID coefficients, fault thresholds, and startup parameters in BLDC motor drivers operating across wide ambient temperatures. IC Role / Device Role / Timing Role: Nonvolatile configuration register accessed at boot and updated during field calibration routines. Use Value: Enables plug-and-play motor replacement with zero manual setup; retains settings through 10+ years of operation without backup battery. | Use Scenario: Holding factory-trimmed offset/gain values and linearization tables for MEMS pressure sensors in medical diagnostic devices. IC Role / Device Role / Timing Role: Read-once-at-power-up data source for analog front-end compensation logic. Use Value: Achieves ±0.1% full-scale accuracy over –40°C to +85°C without recalibration; eliminates need for onboard DACs or trim pots. |
| Industrial PLC I/O Module Parameterization | Energy Meter Firmware Patch Storage |
Use Scenario: Storing channel-specific scaling factors, alarm hysteresis, and sampling rate presets in modular I/O terminals deployed in harsh factory environments. IC Role / Device Role / Timing Role: Field-updatable parameter bank accessed via RS-485 master during commissioning or maintenance. Use Value: Reduces wiring complexity by eliminating DIP-switch banks; supports remote reconfiguration without hardware change. | Use Scenario: Storing signed firmware patches applied during meter firmware upgrade cycles to fix metrology algorithm bugs. IC Role / Device Role / Timing Role: Secure, tamper-resistant patch repository verified via CRC before execution. Use Value: Enables regulatory-compliant over-the-air updates without replacing meter hardware; maintains ANSI C12.22 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93AA66AT-I/OT | Same 512×8 organization and SOT-23-6 package, but lacks ORG pin - identical pinout and timing; differs only in marking code. | No functional difference; both support same VCC range, endurance, and instruction set. | Select 93AA66AT-I/OT if exact marking traceability is not required; otherwise 93AA66BT-I/OT is drop-in compatible. |
| AT25040B-MAHL-T | SPI interface (4-wire), 4 Kbit (512×8), 1.8–5.5 V, SOIC-8 package - requires additional CS line and different command protocol. | Requires firmware rewrite for SPI vs Microwire; larger footprint; higher pin count. | Choose only if existing design already uses SPI peripherals and board space allows SOIC-8; not pin-compatible. |
Compared with 93AA66AT-I/OT, the 93AA66BT-I/OT offers identical electrical and functional behavior but distinct traceability marking; versus AT25040B-MAHL-T, it provides smaller SOT-23-6 footprint and native Microwire compatibility at the cost of interface protocol divergence.
Availability
93AA66BT-I/OT is available at Aetrix Electronics and suitable for motor control configuration storage, smart sensor calibration data retention, and industrial PLC I/O module parameterization requiring stable component supply across extended product lifecycles.
Supply support for 93AA66BT-I/OT 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 design and manufacturing operations.
The 93AA66x series belongs to Microchip's legacy Microwire-compatible EEPROM product line, designed specifically for low-pin-count, low-power nonvolatile storage in resource-constrained embedded systems where simplicity and reliability are critical.
FAQ
What is the memory organization of the 93AA66BT-I/OT?
The 93AA66BT-I/OT is a fixed 512 × 8-bit (4 Kbit) EEPROM with no ORG pin - it operates exclusively in x8 mode. Unlike 'C' variants, it does not support x16 configuration. This simplifies firmware development and eliminates external ORG pull-up/pull-down requirements. The 93AA66BT-I/OT datasheet confirms dedicated 8-bit organization in the Device Selection Table.
Does the 93AA66BT-I/OT require an external pull-up resistor on the DO pin?
No, the 93AA66BT-I/OT does not require an external pull-up on DO. The DO pin is actively driven high or low during READ or Ready/Busy status reporting, and enters High-Z only when CS is low or during EWDS mode. However, if DI and DO are shorted (shared bus), a current-limiting resistor is recommended to prevent bus conflict during dummy-zero phase, as noted in Section 2.2 of the 93AA66BT-I/OT datasheet.
What is the minimum VCC required for reliable operation of the 93AA66BT-I/OT?
The 93AA66BT-I/OT requires VCC ≥ 1.8 V for full specification compliance across the industrial temperature range. Below 1.5 V, internal voltage detect circuitry disables all operations to prevent data corruption. The 93AA66BT-I/OT datasheet specifies VPOR = 1.5 V (typical) in Table 1-1, D11, ensuring safe power-up sequencing without external reset ICs.
How does write protection work on the 93AA66BT-I/OT?
The 93AA66BT-I/OT implements hardware-enforced write protection via EWEN (Erase/Write Enable) and EWDS (Erase/Write Disable) commands. It powers up in EWDS state; an explicit EWEN instruction must precede any ERASE or WRITE. After programming, issuing EWDS restores protection. This two-step mechanism prevents accidental writes during noise events or firmware glitches - a core feature confirmed in Section 2.6 of the 93AA66BT-I/OT datasheet.
Is the 93AA66BT-I/OT RoHS compliant and lead-free?
Yes, the 93AA66BT-I/OT is Pb-free and RoHS compliant, with Matte Tin (Sn) finish on all leads. This is explicitly stated in the Features section of the 93AA66BT-I/OT datasheet (DS21795E) and confirmed in Packaging Information (Section 4.1). The SOT-23-6 package (OT) meets JEDEC J-STD-609A Class 1 marking requirements.
93AA66BT-I/OT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-6
- 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:
- SOT-23-6
93AA66BT-I/OT FAQ
1.How can I place an order for 93AA66BT-I/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA66BT-I/OT 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/OT reliable?
The price and inventory of 93AA66BT-I/OT 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/OT is usually 5 days.
3.What payment methods are accepted for 93AA66BT-I/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA66BT-I/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA66BT-I/OT?
93AA66BT-I/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA66BT-I/OT 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/OT?
For technical support, including 93AA66BT-I/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA66BT-I/OT requirements.
6.How does Aetrix verify that 93AA66BT-I/OT is sourced from the original manufacturer or authorized distributors?
All 93AA66BT-I/OT 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/OT meets industry standards.
7.What is the process for return or replacement of 93AA66BT-I/OT?
All 93AA66BT-I/OT units undergo pre-shipment inspection (PSI). If there is an issue with 93AA66BT-I/OT, 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/OT part is unused and in its original packaging.
Return procedure for 93AA66BT-I/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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