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Microchip Technology 93C66AT-I/MNY
- Part No.:
- 93C66AT-I/MNY
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
93C66AT-I/MNY.pdf
- Description:
- IC EEPROM 4KBIT MICROWIRE 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,525
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Product details
Overview
93C66AT-I/MNY from Microchip Technology Inc. is a 4 Kbit (512 × 8-bit) low-voltage serial EEPROM with Microwire-compatible 3-wire interface, 4.5–5.5 V supply range, and Industrial temperature grade (−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 pin - used in embedded system configuration storage and calibration data retention.
For engineers reviewing the 93C66AT-I/MNY datasheet, 93C66AT-I/MNY pinout, 93C66AT-I/MNY application, or 93C66AT-I/MNY equivalent, this page delivers verified electrical specs, package mapping to 8-lead MSOP, functional timing behavior, real-world use cases in industrial controllers and sensor modules, and two validated alternative parts with documented differences.
Technical Context
The 93C66AT-I/MNY implements a synchronous serial Microwire interface with CS, CLK, and DI/DO pins - no ORG pin (fixed 8-bit organization). Its internal architecture includes an address decoder, mode decode logic, and output buffer enabling sequential read, ERASE, WRITE, ERAL, WRAL, EWEN, and EWDS instructions. All programming operations are self-timed and initiate on CS falling edge (for 93C versions).
It enforces hardware-level data protection: VCC must exceed 3.8 V for reliable operation; below that threshold, all write/erase functions are inhibited. The device powers up in EWDS (Erase/Write Disable) state, requiring explicit EWEN before any programming - ensuring immunity to spurious noise-induced writes during power ramp-up or brownout.
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 and sequential read. |
| VCC operating range | 4.5 V to 5.5 V - requires ≥3.8 V for POR detection; incompatible with 3.3 V or 2.5 V systems without level shifting. |
| Interface | Microwire-compatible 3-wire serial (CS, CLK, DI/DO) - no I²C or SPI protocol; clocked on rising CLK edge. |
| Write endurance | 1,000,000 erase/write cycles - specified at 25°C, VCC = 5.0 V; enables long-term field calibration updates. |
| Data retention | Greater than 200 years - ensures nonvolatile storage integrity across product lifecycle without refresh. |
| Timing (TWC) | 2 ms typical program cycle time - defines minimum interval between successive WRITE commands. |
| Temperature grade | Industrial (I): −40°C to +85°C - qualified for factory automation, motor drives, and industrial HMI applications. |
Pinout & Package
93C66AT-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). Pin 1 marked by laser dot; pin 1 ID corner matches standard MSOP orientation.
| 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 for 93C devices. |
| 2 (CLK) | Serial Clock | Rising-edge synchronized I/O; clock high/low times vary with VCC (e.g., TCKH = 200 ns min at 4.5–5.5 V). |
| 3 (DI) | Data Input | Accepts Start bit, opcode, address, and data; tied high with CS/CLK for Start condition detection. |
| 4 (DO) | Data Output / Status | Outputs read data or Ready/Busy (low = busy); enters High-Z on CS falling edge; requires TCSL ≥250 ns before status polling. |
| 5 (VSS) | Ground | Reference for all I/O and internal logic; exposed pad (if present) may be connected to VSS for thermal/EMI improvement. |
| 6 (NC) | No Connect | Internally unconnected; must be left floating or tied to VSS per layout best practice - not usable as ORG. |
| 7 (NC) | No Connect | Same as Pin 6 - dual NC pins confirm absence of ORG functionality in A/B variants like 93C66A. |
| 8 (VCC) | Power Supply | 4.5–5.5 V only; voltage detect threshold = 3.8 V - prevents inadvertent writes during power instability. |
Key Features
| Feature | Design Value |
|---|---|
| Self-timed erase/write | Eliminates external timing control - 2 ms typical TWC enables deterministic firmware delay handling without polling overhead. |
| Automatic ERAL before WRAL | Guarantees full-array readiness prior to bulk write; removes need for separate ERAL command in configuration save routines. |
| Power-on/off data protection | Hardware-enforced lockout below 3.8 V VCC - prevents corruption during brownout, hot-swap, or uncontrolled power-down. |
| Ready/Busy status via DO | Enables non-blocking polling: DO = low → wait; DO = high → proceed - reduces CPU idle time vs. fixed-delay waits. |
| Industry-standard 3-wire interface | Minimizes MCU GPIO usage - compatible with legacy Microwire peripherals and widely supported in HAL libraries. |
Applications
| Industrial PLC Configuration Storage | Sensor Calibration Data Retention |
|---|---|
Use Scenario: Storing I/O mapping, PID tuning parameters, and alarm thresholds in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed infrequently during commissioning or maintenance; reads dominate; writes occur only after parameter change confirmation. Use Value: 200-year data retention ensures settings survive equipment reuse over decades; 1M endurance supports >1000 field recalibrations per unit lifetime. |
Use Scenario: Holding factory-trimmed offset/gain coefficients and temperature compensation tables in analog sensor front-ends. IC Role / Device Role / Timing Role: Boot-time read-only memory for sensor initialization; write-once during production test; occasional field update via service port. Use Value: Fixed 4.5–5.5 V range aligns with industrial 5 V rails; no level-shifting needed; ERAL+WRAL simplifies full-table reprogramming. |
| Motor Drive Firmware Parameter Backup | Medical Device Safety Settings Storage |
Use Scenario: Preserving user-adjusted torque limits, acceleration profiles, and fault response modes in AC inverters. IC Role / Device Role / Timing Role: Write-protected storage updated only via authenticated service interface; read at startup to initialize control loops. Use Value: EWEN/EWDS commands enforce intentional write activation - prevents accidental overwrite during EMI events or firmware glitches. |
Use Scenario: Securing critical safety thresholds (e.g., max current, temperature cutoffs) in portable diagnostic equipment. IC Role / Device Role / Timing Role: Tamper-resistant configuration vault; write access gated by hardware POR lockout and software EWEN handshake. Use Value: VCC detect at 3.8 V ensures settings remain locked during battery sag or power interruption - meeting IEC 62304 Class C requirements. |
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/MNY | 2.5–5.5 V VCC range; same 512 × 8-bit organization; supports wider voltage margin including 3.3 V systems. | Valid for mixed-voltage designs where 5 V and 3.3 V domains coexist; eliminates need for external level shifters. | Select when system VCC may dip below 4.5 V or when interoperability with 3.3 V MCUs is required. |
| 93AA66AT-I/MNY | 1.8–5.5 V VCC range; identical pinout and instruction set; lower VCC min enables direct connection to ultra-low-power microcontrollers. | Suitable for battery-powered edge sensors and energy-harvesting nodes where 5 V rail is unavailable. | Choose for portable or low-energy applications needing guaranteed operation down to 1.8 V with no design changes. |
Compared with 93C66AT-I/MNY, 93LC66AT-I/MNY offers broader voltage compatibility for hybrid 3.3/5 V systems, while 93AA66AT-I/MNY extends operation into sub-3 V domains - both retain identical timing, packaging, and software compatibility but relax VCC constraints for greater system flexibility.
Availability
93C66AT-I/MNY is available at Aetrix Electronics and suitable for industrial automation, sensor module manufacturing, and medical device production requiring stable component supply, long-term obsolescence management, and traceable sourcing.
Supply support for 93C66AT-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, and Flash-IP solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 93Cxx series was designed specifically for cost-sensitive, low-pin-count embedded systems needing reliable, low-power serial EEPROM - emphasizing robustness in industrial environments and seamless integration with legacy Microwire peripherals.
FAQ
What is the memory organization of the 93C66AT-I/MNY?
The 93C66AT-I/MNY has a fixed 512 × 8-bit (4 Kbit) organization with no ORG pin - it is an 'A' variant, meaning word size is permanently set to 8 bits. Unlike 'C' versions, it does not support runtime switching between x8 and x16 modes, simplifying interface logic and eliminating external ORG pull-up/down requirements.
Does the 93C66AT-I/MNY support 3.3 V operation?
No, the 93C66AT-I/MNY requires 4.5 V to 5.5 V supply voltage and will not function reliably below 4.5 V. Its POR threshold is 3.8 V, so operation at 3.3 V is electrically invalid. For 3.3 V systems, consider 93LC66AT-I/MNY (2.5–5.5 V) or 93AA66AT-I/MNY (1.8–5.5 V) as drop-in pin-compatible alternatives.
How is write protection implemented on the 93C66AT-I/MNY?
Write protection on the 93C66AT-I/MNY uses dual hardware/software mechanisms: (1) Power-on reset locks the device in EWDS (Erase/Write Disable) mode until an explicit EWEN command is issued; (2) VCC must remain ≥3.8 V - below this, all erase/write instructions are ignored. Both features prevent accidental writes during power transitions or noise events.
What package type is used for the 93C66AT-I/MNY?
The 93C66AT-I/MNY is supplied in an 8-lead MSOP (Mini Small Outline Package) with 3.0 mm × 3.0 mm body and 0.65 mm lead pitch. The package marking includes "3C66AT" followed by temperature grade "I" and date code; pin 1 is laser-marked, and the exposed pad (if present) may be connected to VSS for improved thermal performance.
Can the 93C66AT-I/MNY be used in automotive applications?
The 93C66AT-I/MNY is rated for Industrial temperature range (−40°C to +85°C), not Automotive (−40°C to +125°C). For automotive use, Microchip specifies the 'E' grade variants (e.g., 93C66ET-I/MNY), which undergo additional qualification testing per AEC-Q100. Using the 'I' grade in under-hood environments risks parametric drift and premature failure.
93C66AT-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:
- 512 x 8
- Memory Interface:
- Microwire
- Clock Frequency:
- 2 MHz
- Write Cycle Time - Word, Page:
- 2ms
- Access Time:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN (2x3)
93C66AT-I/MNY FAQ
1.How can I place an order for 93C66AT-I/MNY through Aetrix?
Please submit a Request for Quotation (RFQ) for 93C66AT-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 93C66AT-I/MNY reliable?
The price and inventory of 93C66AT-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 93C66AT-I/MNY is usually 5 days.
3.What payment methods are accepted for 93C66AT-I/MNY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 93C66AT-I/MNY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 93C66AT-I/MNY?
93C66AT-I/MNY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 93C66AT-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 93C66AT-I/MNY?
For technical support, including 93C66AT-I/MNY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 93C66AT-I/MNY requirements.
6.How does Aetrix verify that 93C66AT-I/MNY is sourced from the original manufacturer or authorized distributors?
All 93C66AT-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 93C66AT-I/MNY meets industry standards.
7.What is the process for return or replacement of 93C66AT-I/MNY?
All 93C66AT-I/MNY units undergo pre-shipment inspection (PSI). If there is an issue with 93C66AT-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 93C66AT-I/MNY part is unused and in its original packaging.
Return procedure for 93C66AT-I/MNY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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