93LC66AT/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93LC66AT/ST is a 4Kbit EEPROM memory integrated circuit manufactured by Microchip Technology, designed for non-volatile data storage applications requiring Microwire serial interface communication. This device operates across a wide supply voltage range of 2.5V to 5.5V and supports 2 MHz clock frequency operation. The component is currently in active production status with verified programmability certification from DiGi-Electronics. Substitute parts are identified when equivalent electrical specifications, memory capacity, interface protocol, and physical packaging are maintained across alternative part numbers or packaging configurations.

Substiute Parts

93LC66AT/ST

Microchip TechnologyIn Stock: 1294393LC66AT/ST Datasheet

Current PartRFQ

93LC66A-I/ST

Microchip TechnologyIn Stock: 225693LC66A-I/ST Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 93LC66AT/ST are identified based on the following critical parameters that must remain constant:

• Memory capacity: 4Kbit (512 x 8 organization)
• Interface protocol: Microwire serial communication
• Clock frequency: 2 MHz maximum
• Supply voltage compatibility: 2.5V ~ 5.5V range
• Package format: 8-TSSOP surface mount
• Physical dimensions: 0.173" width, 4.40mm width
• Regulatory compliance: ROHS3 Compliant, REACH Unaffected

The 93LC66A-I/ST qualifies as a manufacturer-recommended substitute based on identical electrical specifications, memory architecture, interface characteristics, and physical packaging. Differences in operating temperature range and packaging configuration (Tube versus Tape & Reel) do not affect functional substitutability for applications within the overlapping temperature specification.

Parameter Comparison

Engineering Selection Recommendations

The 93LC66A-I/ST is a direct functional equivalent to the 93LC66AT/ST for applications requiring 4Kbit Microwire EEPROM memory. Both devices maintain identical electrical specifications, memory architecture, and interface protocols. The substitute part provides an extended operating temperature range (-40°C to 85°C versus 0°C to 70°C), which represents an advantage for applications requiring operation across wider environmental conditions.

Selection between these parts should be based on packaging requirements and procurement logistics. The 93LC66AT/ST is supplied in Tape & Reel configuration suitable for automated assembly processes, while the 93LC66A-I/ST is supplied in Tube packaging. Both devices carry equivalent regulatory compliance certifications (ROHS3 Compliant, REACH Unaffected) and maintain active production status with verified programmability.

Frequently Asked Questions (FAQ)

Q: Can the 93LC66A-I/ST replace the 93LC66AT/ST in existing designs?

A: Yes. The 93LC66A-I/ST is functionally equivalent across all electrical parameters, memory specifications, and interface characteristics. The devices are pin-compatible and operate identically within the overlapping temperature range of 0°C to 70°C. The substitute part's extended temperature rating provides additional operational margin.

Q: What is the difference between Tape & Reel and Tube packaging?

A: Tape & Reel packaging is optimized for high-volume automated assembly processes, where components are fed directly into pick-and-place equipment. Tube packaging is used for lower-volume applications or manual assembly. Both packaging formats contain identical components with no functional differences.

Q: Are there any compatibility concerns with the different operating temperature ranges?

A: No compatibility concerns exist for applications operating within the 0°C to 70°C range. The 93LC66A-I/ST's extended temperature specification (-40°C to 85°C) is a superset of the 93LC66AT/ST specification, making it suitable for a broader range of environmental conditions without design modification.

Q: Do both parts meet the same regulatory compliance standards?

A: Yes. Both the 93LC66AT/ST and 93LC66A-I/ST are ROHS3 Compliant and REACH Unaffected, meeting equivalent environmental and regulatory requirements for component selection.

Q: What is the Microwire interface protocol?

A: Microwire is a three-wire serial communication protocol consisting of Chip Select (CS), Clock (CLK), and Data In/Out (DI/DO) lines. This interface enables synchronous serial communication at up to 2 MHz clock frequency for both read and write operations to the EEPROM memory array.