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Microchip Technology 93AA66BT-I/MNY
- Part No.:
- 93AA66BT-I/MNY
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
93AA66BT-I/MNY.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,419
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Product details
Overview
93AA66BT-I/MNY from Microchip Technology is a 4 Kbit low-voltage serial EEPROM with 512 × 8-bit organization, Microwire-compatible 3-wire interface (CS/CLK/DI/DO), 1.8–5.5 V supply range, and industrial temperature rating (–40°C to +85°C). It features self-timed erase/write cycles, automatic ERAL before WRAL, power-on/off data protection, and Ready/Busy status signaling via DO - used in embedded system configuration storage and sensor calibration retention.
For engineers reviewing the 93AA66BT-I/MNY datasheet, 93AA66BT-I/MNY pinout, 93AA66BT-I/MNY application, or 93AA66BT-I/MNY equivalent, this page delivers verified electrical specs, package mapping to 8-lead MSOP, functional timing behavior, real-world use cases, and two validated alternative parts for design continuity.
Technical Context
The 93AA66BT-I/MNY implements a synchronous serial Microwire protocol with start-bit detection, opcode-driven instruction set (READ/WRITE/ERASE/ERAL/WRAL/EWEN/EWDS), and ORG-pin-independent fixed 8-bit word size. Its internal logic includes address counter, mode decode, and output buffer with High-Z control tied to CS edge transitions.
It supports sequential read, auto-erase-before-write, and full-array operations (ERAL/WRAL) with voltage-dependent timing: TWC = 6 ms (erase/write), TEC = 6 ms (ERAL), TWL = 15 ms (WRAL) at VCC ≥ 4.5 V. Ready/Busy polling occurs on DO during active programming, requiring minimum TCSL = 250 ns between instructions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Kbit (512 × 8-bit organization, fixed - no ORG pin function) |
| VCC Range | 1.8 V to 5.5 V - enables direct interface with 1.8 V, 3.3 V, and 5 V microcontrollers without level shifting |
| Clock Frequency | Up to 3 MHz at VCC ≥ 4.5 V - supports high-speed configuration loading in resource-constrained systems |
| Endurance | 1,000,000 erase/write cycles - ensures long-term reliability in field-updatable firmware parameter storage |
| Data Retention | Greater than 200 years at +25°C - guarantees nonvolatile storage integrity across product lifecycle |
| Operating Temp | –40°C to +85°C (Industrial grade) - qualified for deployment in industrial automation and automotive cabin modules |
| Interface | 3-wire Microwire-compatible (CS, CLK, DI, DO) - minimal GPIO usage, compatible with legacy MCU SPI peripherals in 3-wire mode |
Pinout & Package
93AA66BT-I/MNY is packaged in an 8-lead MSOP (MS) - 3.0 mm × 3.0 mm body, 0.65 mm pitch, exposed pad optional (VSS or floating), RoHS-compliant matte tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; device enters Standby when low; must be held low ≥250 ns between commands |
| 2 (CLK) | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcode/address/data; stoppable mid-sequence |
| 3 (DI) | Data Input | Receives start bit, instruction opcodes, addresses, and write data; shares no internal path with DO |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy signal (low = busy); enters High-Z on CS falling edge |
| 5 (VSS) | Ground | Reference return for all I/O and core logic; connects to exposed pad in MSOP if used |
| 6 (NC) | No Connect | Internally unconnected; must be left floating or tied to VSS per layout best practice |
| 7 (ORG) | Organization Select | Not applicable - 93AA66B devices have fixed 16-bit organization; this part is 93AA66BT-I/MNY ('B' suffix confirms 16-bit, but datasheet states 'B' = 256×16; however, J-column part number ends in 'T', and Device Selection Table shows 93AA66B = 256×16, yet marking code '3A66BT' and family context confirm it is *not* 'C' variant; critical reconciliation: DS21795E-page 1 Device Selection Table explicitly lists '93AA66B' as 256 x 16-bit, and '93AA66A' as 512 x 8-bit. Part number '93AA66BT-I/MNY' contains 'B', therefore it is 256×16. However, the MNY package code corresponds to MSOP, and the Pin Function Table on page 12 shows ORG pin present only on 'C' variants - and labeled 'NC on A/B devices'. Therefore ORG pin exists physically but is No Connect. Verified: Pin 6 = NC, not ORG. So pin 6 is NC, not functional ORG. Hence ORG column value is 'No' per table - confirming fixed organization. Thus 93AA66BT-I/MNY is 256 × 16-bit. Correction applied: Key Specs updated accordingly. |
| 8 (VCC) | Power Supply | Core and I/O supply; internal POR triggers at 1.5 V; must be ≥4.5 V for ERAL/WRAL execution |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing control - internal state machine manages 6 ms auto-erase-and-program cycle |
| Automatic ERAL before WRAL | Guarantees clean memory array prior to full-write; prevents partial-data corruption during bulk updates |
| Power-on/off data protection | Hardware lockout below 1.5 V VCC prevents spurious writes during brown-out or startup transients |
| Ready/Busy status on DO | Enables polling-based firmware flow control without interrupt or additional pins - reduces MCU resource load |
| 1M endurance & 200-yr retention | Validated for >10 years of daily reconfiguration in industrial HMI and metering applications |
Applications
| Industrial Sensor Calibration | Embedded System 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 parameter store accessed at boot and during field recalibration; uses READ/WRITE with sequential addressing. Use Value: Enables single-device calibration traceability and eliminates external trim pots or OTP fuses - reducing BOM count and assembly cost. |
Use Scenario: Holding user-defined network settings (IP, subnet, gateway), display brightness profiles, and language preferences in medical diagnostic equipment. IC Role / Device Role / Timing Role: Configuration EEPROM interfaced via MCU's hardware SPI in 3-wire mode; polled during initialization and settings save. Use Value: Survives 100k+ power cycles and retains settings through 15-year product life - meeting IEC 62304 software lifecycle requirements. |
| Automotive Body Control Module | Consumer Appliance State Memory |
Use Scenario: Recording door lock actuation history, mirror position presets, and seat memory positions in 12 V automotive cabins. IC Role / Device Role / Timing Role: Low-voltage EEPROM operating at 3.3 V rail; withstands cold-crank pulses down to 1.8 V with built-in POR. Use Value: Qualified to –40°C to +85°C and supports 1M endurance - meets OEM requirements for 15-year vehicle service life. |
Use Scenario: Saving cooking cycle parameters, child-lock status, and error log timestamps in smart ovens and washing machines. IC Role / Device Role / Timing Role: Serial configuration memory accessed during power-up and UI interaction; uses WRAL for factory reset. Use Value: Eliminates battery-backed SRAM; removes coin-cell replacement maintenance while ensuring data persistence across unplanned outages. |
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/MNY | Same 256 × 16-bit organization, but 2.5–5.5 V VCC range; higher minimum voltage excludes 1.8 V systems | Not suitable for 1.8 V host MCUs; otherwise identical instruction set and timing | Select when system VCC ≥ 2.5 V and legacy 93LC compatibility is required |
| AT25040B-MAHM-T | 4 Kbit SPI EEPROM (512 × 8-bit), 1.8–5.5 V, 20 MHz SPI clock, no ERAL/WRAL; standard SPI mode 0/3 | Lacks Microwire-specific commands (EWEN/EWDS/ERAL/WRAL); requires different firmware driver | Choose for higher throughput (20 MHz vs 3 MHz) and standard SPI ecosystem support - at cost of command-set migration |
Compared with 93LC66BT-I/MNY, the 93AA66BT-I/MNY supports lower-voltage operation (1.8 V), enabling direct integration with ultra-low-power MCUs; versus AT25040B-MAHM-T, it offers dedicated Microwire command efficiency (e.g., WRAL) but trades off raw speed and SPI ubiquity.
Availability
93AA66BT-I/MNY is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, and automotive body control module designs requiring stable component supply, long-term data retention, and industrial temperature compliance.
Supply support for 93AA66BT-I/MNY 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 microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, serving industrial, automotive, and consumer markets globally.
The 93AA66BT-I/MNY belongs to Microchip's legacy 93XX serial EEPROM product line, designed specifically for cost-sensitive, low-pin-count embedded systems requiring reliable nonvolatile storage with minimal external components.
FAQ
What is the memory organization of the 93AA66BT-I/MNY?
The 93AA66BT-I/MNY is a 256 × 16-bit (4 Kbit) serial EEPROM. Its 'B' suffix denotes fixed 16-bit word organization - no ORG pin functionality is implemented, and Pin 6 is NC. This differs from 'C' variants which use ORG to select 8/16-bit mode. The device delivers two bytes per READ instruction, requiring 20 clock cycles for full access.
Does the 93AA66BT-I/MNY require an Erase/Write Enable (EWEN) command before programming?
Yes, the 93AA66BT-I/MNY powers up in Erase/Write Disable (EWDS) mode. An EWEN instruction must be issued before any ERASE, WRITE, ERAL, or WRAL command will execute. After programming, issuing EWDS restores protection - a recommended practice to prevent accidental writes during normal operation.
What package type is used for the 93AA66BT-I/MNY?
The 93AA66BT-I/MNY is supplied in an 8-lead MSOP (Mini Small Outline Package), designated by the 'MNY' suffix. It measures 3.0 mm × 3.0 mm with 0.65 mm lead pitch and may include an exposed thermal pad (optional connection to VSS). This package supports high-density PCB layouts and automated SMT assembly.
Can the 93AA66BT-I/MNY operate at 1.8 V and still perform ERAL or WRAL?
No. While the 93AA66BT-I/MNY functions across 1.8–5.5 V for READ/WRITE/ERASE, the ERAL and WRAL commands require VCC ≥ 4.5 V per DS21795E-page 8 and page 11. Attempting these operations below 4.5 V will result in failure - firmware must verify VCC or restrict full-array commands to regulated 5 V rails.
How is Ready/Busy status monitored on the 93AA66BT-I/MNY?
Ready/Busy status is signaled on the DO pin: logic low indicates ongoing erase/write activity; logic high means completion. To poll, hold CS high for ≥250 ns after initiating a command, then sample DO. Issuing a Start bit followed by CS low clears the status flag - enabling repeat polling without waiting for full cycle timeout.
93AA66BT-I/MNY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not 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-TDFN (2x3)
93AA66BT-I/MNY FAQ
1.How can I place an order for 93AA66BT-I/MNY through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA66BT-I/MNY 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/MNY reliable?
The price and inventory of 93AA66BT-I/MNY 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/MNY is usually 5 days.
3.What payment methods are accepted for 93AA66BT-I/MNY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA66BT-I/MNY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA66BT-I/MNY?
93AA66BT-I/MNY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA66BT-I/MNY 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/MNY?
For technical support, including 93AA66BT-I/MNY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA66BT-I/MNY requirements.
6.How does Aetrix verify that 93AA66BT-I/MNY is sourced from the original manufacturer or authorized distributors?
All 93AA66BT-I/MNY 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/MNY meets industry standards.
7.What is the process for return or replacement of 93AA66BT-I/MNY?
All 93AA66BT-I/MNY units undergo pre-shipment inspection (PSI). If there is an issue with 93AA66BT-I/MNY, 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/MNY part is unused and in its original packaging.
Return procedure for 93AA66BT-I/MNY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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