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Microchip Technology 93AA66CXT-I/SN
- Part No.:
- 93AA66CXT-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93AA66CXT-I/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,003
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Product details
Overview
93AA66CXT-I/SN from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with configurable 8-/16-bit word organization controlled by the ORG pin, 1.8–5.5 V supply range, industrial temperature rating (–40°C to +85°C), and Microwire-compatible 3-wire serial interface. It delivers 1 million erase/write cycles and >200 years data retention for nonvolatile storage in microcontroller-based systems.
For engineers reviewing the 93AA66CXT-I/SN datasheet, 93AA66CXT-I/SN pinout, 93AA66CXT-I/SN application, or 93AA66CXT-I/SN equivalent, key selection criteria include ORG-pin-configurable memory width, self-timed erase/write with ERAL/WRAL support, Ready/Busy status signaling via DO, low standby current (1 µA), and compatibility with space-constrained SOIC-8 (SN) packaging.
Technical Context
The 93AA66CXT-I/SN implements a synchronous Microwire-compatible serial interface with CS, CLK, DI, and DO signals plus dedicated ORG pin for runtime memory width selection (8-bit when ORG = VSS, 16-bit when ORG = VCC). It uses internal auto-erase before write and supports full-array operations including ERAL (Erase All) and WRAL (Write All).
Its functional architecture includes an address decoder, mode decode logic, clock register, and output buffer, with power-on/off data protection and EWEN/EWDS command-based write enable/disable control. The device enters Standby mode when CS is low and asserts Ready/Busy status on DO during active programming cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8 or 256 × 16, selectable via ORG pin) |
| VCC range | 1.8 V to 5.5 V - enables direct interfacing with 1.8 V, 3.3 V, and 5 V logic domains |
| Endurance | 1,000,000 erase/write cycles - supports frequent firmware or calibration updates |
| Data retention | >200 years at 25°C - ensures long-term reliability in unattended equipment |
| Max clock frequency | 3 MHz at VCC ≥ 4.5 V - allows high-speed configuration loading without external timing constraints |
| Standby current | 1 µA (I-temp) - minimizes quiescent power in battery-backed or energy-harvesting systems |
| Write cycle time | 6 ms (TWC) - defines minimum interval between successive write commands |
Pinout & Package
93AA66CXT-I/SN is packaged in 8-lead SOIC (SN), with pin 1 marked by laser dot. The package supports surface-mount assembly and complies with Pb-free (Matte Tin) RoHS requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-high enable; must be held low ≥250 ns between instructions to reset internal logic |
| CLK | Serial Clock | Synchronizes all data transfers; rising edge clocks in opcodes, addresses, and data |
| DI | Data Input | Receives Start bit, instruction opcodes, address bits, and write data |
| DO | Data Output / Status | Outputs read data or Ready/Busy status (low = busy, high = ready) during programming |
| VSS | Ground | Reference return path for all I/O and core circuitry |
| ORG | Organization Control | Configures memory width: tied to VSS for 512×8, to VCC for 256×16 |
| NC | No Internal Connection | Pin 7 has no die bond; must be left floating or grounded per layout best practice |
| VCC | Power Supply | Supplies core and I/O circuitry; internal POR triggers at ~1.5 V for data protection |
Key Features
| Feature | Design Value |
|---|---|
| ORG-pin word-size selection | Enables single-BOM flexibility across 8-bit and 16-bit host interfaces without redesign |
| Self-timed erase/write with auto-erase | Eliminates need for external timing control or polling delays beyond TWC/TEC/TWL |
| ERAL and WRAL instructions | Supports full-memory initialization in one command (requires VCC ≥ 4.5 V) |
| Ready/Busy status on DO | Allows real-time progress monitoring without additional GPIO or interrupt lines |
| Power-on/off data protection | Hardware-enforced write inhibition below 1.5 V prevents corruption during brownout or power ramp |
Applications
| Industrial Sensor Calibration | Consumer Remote Control Memory |
|---|---|
Use Scenario: Storing factory-trimmed sensor offset/gain coefficients and field-updated linearization tables in pressure or temperature transmitters. IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed during power-up initialization and periodic recalibration routines. Use Value: Maintains accuracy over 200+ years without backup battery; ORG pin allows reuse across 8-bit MCU (legacy) and 16-bit DSP (upgrade) platforms. | Use Scenario: Retaining user-programmed channel presets, volume limits, and IR code learning history in universal remotes. IC Role / Device Role / Timing Role: Low-power serial memory interfaced directly to 8-bit microcontroller via 3-wire Microwire bus. Use Value: 1 µA standby current extends coin-cell life; 3 MHz max clock enables fast setup during button-press wake-up. |
| Medical Device Configuration | Automotive Body Control Module |
Use Scenario: Saving patient-specific therapy parameters and usage logs in portable infusion pumps or glucose meters. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage with EWEN/EWDS lockout preventing accidental overwrite during operation. Use Value: 1M endurance supports daily parameter updates over 10+ years; industrial temp range covers clinical and home-use environments. | Use Scenario: Storing door lock/unlock patterns, mirror position memories, and lighting profiles in BCMs. IC Role / Device Role / Timing Role: Serial EEPROM integrated into CAN/LIN subsystem for nonvolatile settings storage. Use Value: VCC range (1.8–5.5 V) accommodates wide automotive battery swing; Pb-free SN package meets AEC-Q200-adjacent assembly requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66CXT-I/SN | Same pinout and ORG functionality, but wider VCC min = 2.5 V; higher ESD rating (≥4 kV) | Not suitable for 1.8 V systems; preferred where higher noise immunity or extended voltage margin is required | Select when operating above 2.5 V and enhanced robustness is prioritized over ultra-low-voltage support |
| 93AA66AXT-I/SN | Dedicated 8-bit-only (no ORG pin); identical VCC, endurance, and timing specs | Lacks runtime word-width reconfiguration; simplifies design where only 8-bit interface is needed | Choose for cost-sensitive, fixed-architecture designs eliminating ORG routing and pull-up/down components |
Compared with 93LC66CXT-I/SN, the 93AA66CXT-I/SN enables true 1.8 V operation and offers broader system-level voltage compatibility; compared with 93AA66AXT-I/SN, it adds hardware-configurable memory width-critical for multi-platform firmware reuse and future-proofing.
Availability
93AA66CXT-I/SN is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and automotive body control modules requiring stable component supply, long-term data integrity, and RoHS-compliant packaging.
Supply support for 93AA66CXT-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, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design, manufacturing, and sales operations.
The 93XX Series EEPROMs were designed for low-power, nonvolatile memory applications in resource-constrained embedded systems, emphasizing voltage flexibility, long data retention, and simple 3-wire serial integration.
FAQ
What is the function of the ORG pin on the 93AA66CXT-I/SN?
The ORG pin on the 93AA66CXT-I/SN selects memory organization: tied to VSS (ground) configures 512 × 8-bit mode; tied to VCC configures 256 × 16-bit mode. This allows a single 93AA66CXT-I/SN part to serve both 8-bit and 16-bit host interfaces without changing the PCB layout or firmware driver abstraction layer.
Does the 93AA66CXT-I/SN require external timing components for write operations?
No, the 93AA66CXT-I/SN performs self-timed erase and write cycles. Once the falling edge of CS initiates programming (for 93AA versions), the internal logic completes auto-erase and write autonomously within 6 ms (TWC). No external timers, clocks, or delay loops are needed-only Ready/Busy polling via DO or fixed timeout handling is required.
Can the 93AA66CXT-I/SN be used in 1.8 V systems?
Yes, the 93AA66CXT-I/SN supports a VCC range of 1.8 V to 5.5 V and is fully specified down to 1.8 V, including AC timing (e.g., 1 MHz max clock at 1.8 V) and DC parameters (e.g., VIH1 = 2.0 V, VIL2 = 0.2 × VCC). This makes it compatible with modern ultra-low-power MCUs and SoCs operating at 1.8 V.
How does the 93AA66CXT-I/SN protect against unintended writes during power transitions?
The 93AA66CXT-I/SN incorporates hardware power-on/off data protection: internal circuitry inhibits all write operations when VCC falls below ~1.5 V. Additionally, it powers up in Erase/Write Disable (EWDS) mode, requiring an explicit EWEN command before any ERASE or WRITE instruction executes-preventing corruption during brownout or reset sequences.
What packages are available for the 93AA66CXT-I/SN, and what does 'SN' signify?
The 93AA66CXT-I/SN is offered in 8-lead SOIC packaging, where 'SN' is Microchip's package code for standard SOIC (Small Outline Integrated Circuit). This surface-mount package measures 3.9 mm × 4.9 mm, supports reflow soldering, and features Pb-free Matte Tin finish compliant with RoHS Directive 2011/65/EU.
93AA66CXT-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:
- Not 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:
- 3 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
93AA66CXT-I/SN FAQ
1.How can I place an order for 93AA66CXT-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA66CXT-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 93AA66CXT-I/SN reliable?
The price and inventory of 93AA66CXT-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 93AA66CXT-I/SN is usually 5 days.
3.What payment methods are accepted for 93AA66CXT-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA66CXT-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA66CXT-I/SN?
93AA66CXT-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA66CXT-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 93AA66CXT-I/SN?
For technical support, including 93AA66CXT-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA66CXT-I/SN requirements.
6.How does Aetrix verify that 93AA66CXT-I/SN is sourced from the original manufacturer or authorized distributors?
All 93AA66CXT-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 93AA66CXT-I/SN meets industry standards.
7.What is the process for return or replacement of 93AA66CXT-I/SN?
All 93AA66CXT-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93AA66CXT-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 93AA66CXT-I/SN part is unused and in its original packaging.
Return procedure for 93AA66CXT-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
93AA66CXT-I/SN Tags
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