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Microchip Technology 93AA66C-I/SN
- Part No.:
- 93AA66C-I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
93AA66C-I/SN.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,488
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Product details
Overview
93AA66C-I/SN from Microchip Technology Inc. is a 4 Kbit low-voltage serial EEPROM with configurable 8-bit or 16-bit word organization selected via 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 peripherals and power management systems.
For engineers reviewing the 93AA66C-I/SN datasheet, 93AA66C-I/SN pinout, 93AA66C-I/SN application, or 93AA66C-I/SN equivalent, key selection criteria include ORG-pin-configurable word size, self-timed erase/write with ERAL/WRAL support, Ready/Busy status signaling on DO, low standby current (1 µA), and compatibility with SOIC-8 (SN) packaging for legacy board designs.
Technical Context
The 93AA66C-I/SN implements a synchronous Microwire-compatible serial interface with CS, CLK, DI, and DO signals plus dedicated ORG input for runtime memory width selection between x8 and x16 modes. Its internal architecture includes auto-erase-before-write, automatic ERAL before WRAL, and power-on/off data protection circuitry.
It supports sequential read, device status polling via DO during programming, and dual-voltage operation down to 1.8 V. Write cycle time is 6 ms (typical) at VCC ≥ 4.5 V, with clock frequency scaling from 1 MHz (1.8–2.5 V) to 3 MHz (4.5–5.5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Kbit (512 × 8 or 256 × 16, selectable via ORG pin) |
| Supply Voltage | 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 configuration updates in field-deployed devices |
| Data Retention | >200 years at +25°C - ensures long-term reliability without refresh in battery-backed or infrequently powered systems |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - minimal GPIO usage, no SPI mode bits required |
| Operating Temp | –40°C to +85°C (Industrial grade) - validated for use in industrial control, metering, and automotive body electronics |
| Standby Current | 1 µA max at TA = –40°C to +85°C - critical for ultra-low-power wake-on-event or energy-harvesting applications |
Pinout & Package
Package: 8-lead SOIC (SN), Pb-free Matte Tin finish, 3.9 mm × 4.9 mm body, 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-high enable; must be held low ≥250 ns between instructions; initiates self-timed write on falling edge (93AA/93LC) |
| 2 (CLK) | Serial Clock | Synchronizes all data transfers; rising-edge sampling of DI and DO; stoppable mid-sequence |
| 3 (DI) | Data Input | Accepts Start bit, opcodes, addresses, and write data; may share trace with DO if series resistor used |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy status (low = busy); high-Z when not active or after CS fall |
| 5 (VSS) | Ground | Reference return path for all digital and analog functions; decoupling capacitor required near pin |
| 6 (ORG) | Organization Control | Logic high → x16 mode; logic low → x8 mode; must be statically tied - no floating allowed |
| 7 (NC) | No Internal Connection | Not bonded; electrically isolated; must be left unconnected or tied to VSS per layout best practice |
| 8 (VCC) | Power Supply | 1.8–5.5 V input; internal POR triggers at ~1.5 V; requires local 0.1 µF ceramic decoupling |
Key Features
| Feature | Design Value |
|---|---|
| ORG-pin word-size selection | Enables single BOM part to serve both 8-bit and 16-bit host MCU interfaces without redesign |
| Self-timed erase/write with auto-erase | Eliminates external timing control; reduces firmware overhead and eliminates need for fixed delay loops |
| ERAL before WRAL | Guarantees full array erase prior to bulk write, preventing stale data corruption in configuration tables |
| Ready/Busy status on DO | Allows polling-based flow control without interrupt lines or additional GPIOs |
| Power-on/off data protection | Hardware-enforced write inhibition below 1.5 V prevents accidental corruption during brown-out or hot-swap events |
Applications
| Smart Energy Meters | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Storing tariff schedules, calibration coefficients, and event logs across power cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration and logging memory interfaced to an 8-bit MCU via Microwire. Use Value: 1M endurance supports daily log writes for >2,700 years; >200-year retention ensures data integrity over product lifetime without backup batteries. | Use Scenario: Holding module identification, channel calibration, and firmware update flags in distributed I/O nodes. IC Role / Device Role / Timing Role: Serial EEPROM providing persistent parameter storage for ARM Cortex-M based controllers. Use Value: ORG pin allows same 93AA66C-I/SN to support both 8-bit legacy firmware and 16-bit optimized drivers without PCB change. |
| Automotive Body Control Units | Medical Diagnostic Equipment |
Use Scenario: Saving seat/mirror position presets, lighting profiles, and fault history in BCMs. IC Role / Device Role / Timing Role: Industrial-grade EEPROM interfaced to CAN-connected microcontrollers for user preference storage. Use Value: –40°C to +85°C rating matches under-hood thermal requirements; 1.8 V operation enables direct connection to low-voltage sensor rails. | Use Scenario: Storing device serial numbers, calibration constants, and regulatory compliance logs in portable diagnostics. IC Role / Device Role / Timing Role: Secure, long-life nonvolatile memory for FDA-critical configuration data. Use Value: Hardware write-protection (EWDS/EWEN) and POR lockout prevent unauthorized or accidental reprogramming during clinical use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 93LC66C-I/SN | VCC range 2.5–5.5 V; identical pinout, ORG function, and instruction set | Not suitable for 1.8 V systems; higher minimum VCC limits use in ultra-low-power sensor nodes | Select when system operates ≥2.5 V and requires same feature set with tighter VCC tolerance |
| AT25040B-MAU-10 | SPI interface (4-wire), 1.8–5.5 V, 4 Kbit, 20 MHz max clock; no ORG pin | Requires separate SPI CS line and different firmware driver; lacks hardware-configurable word size | Choose for higher-speed SPI systems where ORG flexibility is unnecessary and layout supports 4-wire routing |
Compared with 93LC66C-I/SN, the 93AA66C-I/SN supports lower-voltage operation (1.8 V), enabling direct integration into energy-harvesting subsystems; compared with AT25040B-MAU-10, it offers pin-level word-size configurability and simpler 3-wire wiring but trades off maximum clock speed for deterministic timing control.
Availability
93AA66C-I/SN is available at Aetrix Electronics and suitable for smart energy meters, industrial PLC I/O modules, and automotive body control units requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for 93AA66C-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 design and manufacturing operations.
The 93AA66C-I/SN belongs to Microchip's legacy 93XX serial EEPROM family, designed specifically for cost-sensitive, low-power, nonvolatile memory applications in industrial, automotive, and consumer systems requiring Microwire compatibility and robust data retention.
FAQ
What is the function of the ORG pin on the 93AA66C-I/SN?
The ORG pin on the 93AA66C-I/SN selects memory organization: logic high (VCC) configures 256 × 16-bit mode, logic low (VSS) configures 512 × 8-bit mode. It must be statically tied-floating is prohibited-and determines instruction length, address width, and data output format. This pin enables one 93AA66C-I/SN to serve both 8-bit and 16-bit host systems without hardware modification.
Does the 93AA66C-I/SN require external timing components for erase or write operations?
No, the 93AA66C-I/SN performs self-timed erase and write cycles with built-in auto-erase functionality. Once the falling edge of CS (for 93AA/93LC variants) initiates the command, the device internally manages timing-including erase verification and programming-without external clocks, delays, or components. The DO pin provides Ready/Busy status for software synchronization.
What is the minimum VCC voltage that guarantees reliable operation of the 93AA66C-I/SN?
The 93AA66C-I/SN is specified for reliable operation from 1.8 V to 5.5 V. Below 1.8 V, internal power-on reset (POR) activates at ~1.5 V, disabling all write operations and placing the device in a protected state. Therefore, 1.8 V is the guaranteed functional minimum; operation at 1.8 V is fully characterized for timing, endurance, and data retention across the industrial temperature range.
Can the 93AA66C-I/SN be used in place of a 93AA66A-I/SN or 93AA66B-I/SN?
Yes, the 93AA66C-I/SN is pin-compatible and functionally superset of both 93AA66A-I/SN (x8-only) and 93AA66B-I/SN (x16-only). When ORG is tied high, it behaves identically to 93AA66B-I/SN; when tied low, it matches 93AA66A-I/SN. No PCB changes are needed, but firmware must drive ORG appropriately and handle the corresponding instruction set (x8 vs x16 opcodes and address lengths).
How does the 93AA66C-I/SN protect against inadvertent writes during power transitions?
The 93AA66C-I/SN incorporates hardware power-on/off data protection: write operations are disabled when VCC falls below ~1.5 V, and the device powers up in Erase/Write Disable (EWDS) mode. An explicit EWEN instruction is required before any ERASE or WRITE command executes. This dual-layer protection-voltage threshold + command gating-prevents corruption during brown-out, reset, or hot-swap events without firmware intervention.
93AA66C-I/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- 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
93AA66C-I/SN FAQ
1.How can I place an order for 93AA66C-I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for 93AA66C-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 93AA66C-I/SN reliable?
The price and inventory of 93AA66C-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 93AA66C-I/SN is usually 5 days.
3.What payment methods are accepted for 93AA66C-I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93AA66C-I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93AA66C-I/SN?
93AA66C-I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93AA66C-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 93AA66C-I/SN?
For technical support, including 93AA66C-I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93AA66C-I/SN requirements.
6.How does Aetrix verify that 93AA66C-I/SN is sourced from the original manufacturer or authorized distributors?
All 93AA66C-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 93AA66C-I/SN meets industry standards.
7.What is the process for return or replacement of 93AA66C-I/SN?
All 93AA66C-I/SN units undergo pre-shipment inspection (PSI). If there is an issue with 93AA66C-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 93AA66C-I/SN part is unused and in its original packaging.
Return procedure for 93AA66C-I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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