FT93C66A-UTR-T EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The FT93C66A-UTR-T is a 4Kbit non-volatile EEPROM memory IC manufactured by Fremont Micro Devices Ltd. This component operates as a 3-wire serial interface device with a 2 MHz clock frequency, designed for applications requiring persistent data storage in compact surface-mount packages. The part is currently in active production status with robust inventory availability. Substitute parts become necessary when primary sourcing is unavailable, when supply chain constraints occur, or when design flexibility is required across manufacturing locations.

Substiute Parts

FT93C66A-UTR-T

Fremont Micro Devices LtdIn Stock: 20434FT93C66A-UTR-T Datasheet

Current PartRFQ

AT93C66B-XHM-T

Microchip TechnologyIn Stock: 20180AT93C66B-XHM-T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FT93C66A-UTR-T is determined by strict alignment of the following critical parameters:

Memory capacity must remain 4Kbit with identical 512 x 8 or 256 x 16 organization. The 3-wire serial interface is mandatory for protocol compatibility. Clock frequency must be 2 MHz to maintain timing specifications. Package type must be 8-TSSOP with identical 0.173" width and 4.40mm dimensions for PCB layout compatibility. Operating temperature range must encompass -40°C to 85°C. Supply voltage range must support the 1.8V to 5.5V specification window. RoHS3 compliance is required for regulatory alignment.

The AT93C66B-XHM-T manufactured by Microchip Technology meets all substitution criteria. This part maintains identical memory capacity, organization, interface protocol, clock frequency, package dimensions, temperature range, and regulatory compliance status.

Parameter Comparison

Engineering Selection Recommendations

The AT93C66B-XHM-T is a direct functional substitute for the FT93C66A-UTR-T. Both components maintain active product status and ROHS3 compliance. The AT93C66B-XHM-T offers a lower minimum supply voltage specification (1.7V versus 1.8V) and a faster write cycle time (5ms versus 10ms), representing performance improvements over the primary part. These enhancements do not introduce compatibility issues and remain within the design envelope of applications specified for the FT93C66A-UTR-T. Pin-to-pin compatibility, identical package footprint, and matching electrical interface specifications ensure direct substitution without circuit modification.

Frequently Asked Questions (FAQ)

Q: Can the AT93C66B-XHM-T replace the FT93C66A-UTR-T in existing designs?

A: Yes. Both parts share identical memory capacity, interface protocol, clock frequency, package dimensions, and operating temperature range. No circuit modifications are required.

Q: What is the significance of the different write cycle times?

A: The AT93C66B-XHM-T completes write operations in 5ms compared to 10ms for the FT93C66A-UTR-T. This represents faster data storage capability and does not create compatibility issues in applications designed for the slower specification.

Q: Are there voltage supply differences between these parts?

A: The AT93C66B-XHM-T supports operation down to 1.7V, while the FT93C66A-UTR-T minimum is 1.8V. Both support the full 5.5V upper limit. This difference is not a compatibility concern for standard applications.

Q: Is the 8-TSSOP package identical for both parts?

A: Yes. Both components use the 8-TSSOP package with 0.173" width and 4.40mm dimensions. PCB footprints are identical.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both the FT93C66A-UTR-T and AT93C66B-XHM-T are ROHS3 compliant and carry identical regulatory status.

Q: What determines whether a part can substitute for the FT93C66A-UTR-T?

A: Substitution requires matching memory capacity (4Kbit), organization (512 x 8 or 256 x 16), 3-wire serial interface, 2 MHz clock frequency, 8-TSSOP package, -40°C to 85°C temperature range, and ROHS3 compliance. Supply voltage range and write cycle time may vary without affecting substitution eligibility.