93LC66CT-I/MC EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93LC66CT-I/MC is a 4Kbit non-volatile EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol. This component is designed for applications requiring persistent data storage with low power consumption and wide voltage tolerance. The device is currently in active production status with verified programmability through DiGi-Electronics. Substitute parts are identified when equivalent memory capacity, interface protocol, and electrical specifications align within acceptable operational parameters, enabling design flexibility and supply chain continuity.

Substiute Parts

93LC66CT-I/MC

Microchip TechnologyIn Stock: 298293LC66CT-I/MC Datasheet

Current PartRFQ

M93C66-RMC6TG

STMicroelectronicsIn Stock: 18114M93C66-RMC6TG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 93LC66CT-I/MC is determined by the following critical parameters:

• Memory Capacity: Must be 4Kbit with identical organization (512 x 8 or 256 x 16)
• Interface Protocol: Must support Microwire serial communication
• Supply Voltage Range: Must encompass or be compatible with 2.5V ~ 5.5V operation
• Operating Temperature Range: Must support -40°C ~ 85°C minimum
• Package Compatibility: Surface mount packages with equivalent or superior thermal characteristics
• Regulatory Compliance: RoHS3 compliance and REACH unaffected status required

The M93C66-RMC6TG from STMicroelectronics meets these substitution criteria as a functionally equivalent 4Kbit Microwire EEPROM with compatible electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

Both the 93LC66CT-I/MC and M93C66-RMC6TG are active production components with ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for current and future applications. The 93LC66CT-I/MC features DiGi-Electronics verified programmability, providing documented compatibility assurance. The M93C66-RMC6TG offers extended lower voltage operation (1.8V minimum versus 2.5V) and faster write cycle performance (5ms versus 6ms), with broader supply voltage tolerance. Both devices maintain identical memory capacity, organization, and Microwire interface protocol. Selection between these parts should be based on specific application voltage requirements, programmability verification needs, and clock frequency constraints within the system design.

Frequently Asked Questions (FAQ)

Q: Can the M93C66-RMC6TG directly replace the 93LC66CT-I/MC in existing designs?

A: Functional replacement is possible when the application operates within the M93C66-RMC6TG voltage range (1.8V ~ 5.5V) and clock frequency requirements (1 MHz maximum). The lower clock frequency specification of the substitute part must be verified against system timing requirements. Both devices share identical memory capacity, organization, and Microwire protocol.

Q: What are the package differences between these parts?

A: The 93LC66CT-I/MC uses an 8-VFDFN package while the M93C66-RMC6TG uses an 8-UFDFN package. Both are 8-pin surface mount packages with 2x3mm dimensions and exposed pads. Physical footprint compatibility should be verified during PCB layout assessment.

Q: Are there voltage compatibility concerns when substituting?

A: The M93C66-RMC6TG supports lower minimum voltage (1.8V) compared to the 93LC66CT-I/MC (2.5V). Applications operating at 2.5V or higher are fully compatible. Systems requiring operation below 2.5V must use the M93C66-RMC6TG. Both parts support the full 5.5V maximum.

Q: How do clock frequency differences affect substitution?

A: The 93LC66CT-I/MC operates at 3 MHz maximum while the M93C66-RMC6TG operates at 1 MHz maximum. Systems designed for 1 MHz or lower clock frequencies can use either part. Applications requiring 3 MHz operation must use the 93LC66CT-I/MC.

Q: What is the significance of write cycle time differences?

A: The M93C66-RMC6TG provides faster write cycle performance (5ms) compared to the 93LC66CT-I/MC (6ms). This represents a performance improvement and does not create compatibility issues for substitution.

Q: Does programmability verification status affect substitution decisions?

A: The 93LC66CT-I/MC carries DiGi-Electronics verified programmability status, while the M93C66-RMC6TG does not. Applications requiring documented programmability verification should prioritize the 93LC66CT-I/MC. Both parts are active production components with ROHS3 compliance.