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Microchip Technology 93AA66AT-I/MC
- Part No.:
- 93AA66AT-I/MC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
93AA66AT-I/MC.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:613
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Product details
Overview
93AA66AT-I/MC 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 embedded system configuration storage and calibration data retention.
For engineers reviewing the 93AA66AT-I/MC datasheet, 93AA66AT-I/MC pinout, 93AA66AT-I/MC application, or 93AA66AT-I/MC equivalent, key selection criteria include VCC range (1.8–5.5 V), 8-pin DFN package (MC), industrial-grade reliability, and compatibility with legacy Microwire controllers requiring no protocol translation.
Technical Context
The 93AA66AT-I/MC implements a synchronous serial interface with chip-select–gated clocking and edge-triggered data transfer on CLK rising edge. Its internal architecture includes an address decoder, mode decode logic, and output buffer supporting sequential read and Ready/Busy polling via DO pin during erase/write operations.
It operates exclusively in x8 mode (no ORG pin functionality), requires EWEN instruction prior to any write/erase, and enforces TCSL ≥ 250 ns between instructions. Power-down protection activates below 1.5 V VCC, and all programming cycles are fully self-timed - eliminating external timing control requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8-bit) - fixed x8 organization; no ORG pin; supports byte-level addressing |
| VCC range | 1.8 V to 5.5 V - enables direct interfacing with 1.8 V, 3.3 V, and 5 V microcontrollers without level shifters |
| Endurance | 1,000,000 erase/write cycles - ensures long-term field reliability for frequently updated calibration or logging data |
| Data retention | > 200 years at +25°C - guarantees nonvolatile storage integrity over product lifetime without refresh |
| Write cycle time | 6 ms typical (TWC) - defines minimum interval between successive write commands; impacts firmware latency design |
| Interface | Microwire-compatible 3-wire serial (CS/CLK/DI/DO) - interoperable with legacy PIC® MCU peripherals and simple GPIO bit-banging implementations |
| Temp range | Industrial: –40°C to +85°C - qualified for use in industrial controls, metering, and automotive body electronics |
Pinout & Package
Package: 8-lead 2×3 mm DFN (exposed pad), Pb-free Matte Tin finish, moisture sensitivity level (MSL) 3 per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select | Active-high enable; must be held high ≥250 ns between instructions; falling edge initiates self-timed write/erase on AA/LC devices |
| 2 CLK | Serial Clock | Rising-edge synchronized I/O; clock stops freely during transmission; no clock required during auto-erase/write |
| 3 DI | Data Input | Accepts Start bit, opcode, address, and data; tied to DO in shared-bus configurations with current-limiting resistor |
| 4 DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); enters High-Z on CS falling edge |
| 5 NC | No Connection | Internally unconnected; must be left floating or tied to ground per layout best practice |
| 6 ORG | Organization Select | Not functional on 93AA66A - permanently disabled; pin is NC and must not be driven |
| 7 VSS | Ground | Primary reference for all I/O and internal circuitry; exposed pad (if present) should be connected to VSS for thermal and EMI performance |
| 8 VCC | Power Supply | Supplies core and I/O; brown-out detection triggers at ~1.5 V to prevent spurious writes during power ramp |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates need for external timing control or firmware delay loops; cycle completion signaled via DO pin polling |
| Automatic ERAL before WRAL | Ensures full array readiness before bulk write; prevents partial-write corruption without host software intervention |
| Power-on/off data protection | Hardware-enforced write inhibition below 1.5 V VCC; prevents data corruption during brown-out or power-up sequencing |
| Ready/Busy status on DO | Enables efficient polling-based operation without interrupt lines; reduces MCU resource usage in cost-sensitive designs |
| Sequential read mode | Allows continuous burst reads across memory space with single CS assertion - improves throughput for block data retrieval |
Applications
| Industrial Sensor Calibration | Embedded System Configuration |
|---|---|
Use Scenario: Storing factory-trimmed sensor offset/gain coefficients in programmable logic controllers and environmental monitors. IC Role / Device Role / Timing Role: Nonvolatile configuration register holding calibrated parameters accessed at boot and updated during field recalibration. Use Value: Maintains accuracy across power cycles and temperature drift; 200-year retention eliminates field replacement concerns. | Use Scenario: Holding user-defined settings (e.g., display brightness, communication baud rate, alarm thresholds) in medical diagnostic equipment. IC Role / Device Role / Timing Role: Serial configuration store interfaced directly to MCU GPIO or hardware SPI/Microwire peripheral. Use Value: Enables persistent settings without battery backup; 1M endurance supports daily reconfiguration over 27 years. |
| Automotive Body Control Module | Smart Meter Firmware Patch Storage |
Use Scenario: Retaining seat/mirror position memory and lighting profiles in 12 V automotive systems with wide input voltage variation. IC Role / Device Role / Timing Role: Low-voltage EEPROM operating down to 1.8 V during cold-crank conditions; withstands –40°C to +85°C ambient. Use Value: Reliable operation across automotive battery transients; Pb-free RoHS compliance meets OEM supply chain requirements. | Use Scenario: Storing firmware patch images and update metadata in utility smart meters deployed in remote locations. IC Role / Device Role / Timing Role: Secure, field-upgradable code storage isolated from main flash; accessed only during verified OTA update sequences. Use Value: Enables secure, fail-safe firmware recovery without requiring full reflash; WRAL/ERAL support simplifies patch deployment logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66AT-I/MC | VCC min = 2.5 V; same pinout, x8 organization, and DFN package | Not suitable for 1.8 V systems; otherwise identical interface and timing behavior | Select when system VCC never drops below 2.5 V and higher immunity to low-VCC noise is desired |
| AT25040B-MAHL-T | SPI interface (4-wire), 1 MHz max clock, 5.5 V max VCC, SOIC-8 package | Requires different MCU peripheral or bit-bang driver; no DO status polling - uses WIP flag in status register | Choose when migrating to SPI-standard infrastructure or needing higher clock rates than Microwire permits |
Compared with 93LC66AT-I/MC, the 93AA66AT-I/MC supports lower-voltage operation critical for battery-powered devices, while the AT25040B offers SPI compatibility at the cost of added pin count and loss of hardware-ready signaling.
Availability
93AA66AT-I/MC is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for 93AA66AT-I/MC 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, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93AA66AT-I/MC belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for cost-sensitive, low-power embedded systems requiring robust nonvolatile storage with minimal external components and broad voltage compatibility.
FAQ
What is the function of the ORG pin on the 93AA66AT-I/MC?
The ORG pin is not functional on the 93AA66AT-I/MC. As an 'A'-suffix device, it is fixed in 512 × 8-bit organization and has no ORG capability. Per the datasheet, ORG is marked NC (No Connection) for all 93AA66A variants, including 93AA66AT-I/MC, and must remain unconnected or tied to a fixed logic level without affecting operation.
Does the 93AA66AT-I/MC require an external pull-up resistor on the DO pin?
No, the 93AA66AT-I/MC does not require an external pull-up on DO. The DO pin actively drives high or low during read/status phases and enters High-Z when CS is low or during idle. Pull-ups may cause bus contention if DI and DO are shorted; a series resistor (e.g., 100 Ω) is recommended only in shared-bus configurations per Section 2.2 of the 93AA66AT-I/MC datasheet.
What is the maximum clock frequency supported by the 93AA66AT-I/MC at 3.3 V VCC?
At VCC = 3.3 V (within 2.5 V ≤ VCC < 4.5 V range), the 93AA66AT-I/MC supports a maximum clock frequency of 2 MHz per Table 1-2 (A1 parameter). This limit ensures reliable setup/hold timing for DI and CS signals and accounts for process/voltage/temperature variations across the industrial temperature range.
How is write protection implemented on the 93AA66AT-I/MC?
Write protection on the 93AA66AT-I/MC is implemented via hardware brown-out detection (active below ~1.5 V) and software-controlled EWEN/EWDS commands. The device powers up in EWDS (Erase/Write Disable) state; an explicit EWEN instruction must precede any ERASE or WRITE command. Best practice is to issue EWDS immediately after each write to prevent accidental modification.
Is the 93AA66AT-I/MC pin-compatible with the 93LC66AT-I/MC?
Yes, the 93AA66AT-I/MC and 93LC66AT-I/MC are pin-compatible in the MC (8-lead DFN) package, sharing identical pinout, footprint, and solder mask layout. Both support 512 × 8-bit organization and Microwire interface. However, they differ in VCC range (1.8–5.5 V vs. 2.5–5.5 V), so system-level voltage validation is required before substitution.
93AA66AT-I/MC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- 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
- 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-DFN (2x3)
93AA66AT-I/MC FAQ
1.How can I place an order for 93AA66AT-I/MC through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA66AT-I/MC 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 93AA66AT-I/MC reliable?
The price and inventory of 93AA66AT-I/MC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 93AA66AT-I/MC is usually 5 days.
3.What payment methods are accepted for 93AA66AT-I/MC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA66AT-I/MC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA66AT-I/MC?
93AA66AT-I/MC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA66AT-I/MC 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 93AA66AT-I/MC?
For technical support, including 93AA66AT-I/MC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA66AT-I/MC requirements.
6.How does Aetrix verify that 93AA66AT-I/MC is sourced from the original manufacturer or authorized distributors?
All 93AA66AT-I/MC 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 93AA66AT-I/MC meets industry standards.
7.What is the process for return or replacement of 93AA66AT-I/MC?
All 93AA66AT-I/MC units undergo pre-shipment inspection (PSI). If there is an issue with 93AA66AT-I/MC, 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 93AA66AT-I/MC part is unused and in its original packaging.
Return procedure for 93AA66AT-I/MC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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