Microchip 93LC66AX/SN EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The Microchip 93LC66AX/SN is a 4Kbit non-volatile EEPROM memory IC utilizing Microwire serial interface protocol. This component operates at 2 MHz clock frequency with 512 x 8 memory organization and is packaged in 8-SOIC surface mount configuration. The part maintains active product status with ROHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified to address inventory availability, extended operating temperature ranges, or enhanced supply voltage specifications while maintaining core electrical and mechanical compatibility.

Substiute Parts

93LC66AX/SN

Microchip TechnologyIn Stock: 84693LC66AX/SN Datasheet

Current PartRFQ

93AA66A-I/SN

Microchip TechnologyIn Stock: 322493AA66A-I/SN Datasheet

MFR RecommendedRFQ

93LC66A-E/SN

Microchip TechnologyIn Stock: 325893LC66A-E/SN Datasheet

MFR RecommendedRFQ

93LC66A-I/SN

Microchip TechnologyIn Stock: 379893LC66A-I/SN Datasheet

MFR RecommendedRFQ

93LC66A/SN

Microchip TechnologyIn Stock: 175393LC66A/SN Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 93LC66AX/SN is determined by strict equivalence in the following core parameters: memory capacity (4Kbit), memory organization (512 x 8), interface protocol (Microwire), clock frequency (2 MHz), write cycle time (6ms), package configuration (8-SOIC), and mounting type (Surface Mount). All identified substitute parts maintain these specifications without deviation.

Substitute parts are differentiated by three variable parameters: supply voltage range, operating temperature range, and base product designation. The 93LC66AX/SN operates within 2.5V to 5.5V supply voltage and 0°C to 70°C operating temperature. Substitute parts may extend these ranges to accommodate broader application requirements while preserving all other electrical and mechanical characteristics.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts maintain ROHS3 compliance, REACH unaffected status, and unlimited moisture sensitivity rating (MSL 1), ensuring regulatory and environmental compatibility with the original 93LC66AX/SN specification.

Selection between substitute parts depends on application-specific requirements:

The 93AA66A-I/SN extends the supply voltage minimum to 1.8V and operating temperature range to -40°C to 85°C, suitable for low-power and extended temperature applications.

The 93LC66A-E/SN maintains the original 2.5V to 5.5V supply voltage specification while extending the maximum operating temperature to 125°C, appropriate for high-temperature industrial environments.

The 93LC66A-I/SN provides extended operating temperature range (-40°C to 85°C) while maintaining the 2.5V to 5.5V supply voltage, balancing temperature performance with standard voltage requirements.

The 93LC66A/SN matches the original operating temperature range (0°C to 70°C) and supply voltage (2.5V to 5.5V), providing direct functional equivalence with increased inventory availability.

Frequently Asked Questions (FAQ)

Q: Can the 93AA66A-I/SN replace the 93LC66AX/SN in all applications?

A: The 93AA66A-I/SN is electrically and mechanically compatible with the 93LC66AX/SN for applications operating within the overlapping parameter ranges. The 93AA66A-I/SN extends the minimum supply voltage to 1.8V and operating temperature to -40°C, making it suitable for low-voltage and cold-temperature environments. Applications limited to 2.5V minimum supply voltage and 0°C minimum operating temperature will function identically with either part.

Q: What is the difference between the 93LC66A-E/SN and 93LC66A-I/SN?

A: Both parts maintain identical supply voltage (2.5V to 5.5V) and memory specifications. The primary difference is operating temperature range: the 93LC66A-E/SN operates to 125°C maximum, while the 93LC66A-I/SN operates to 85°C maximum. Selection depends on the thermal environment of the application.

Q: Are all substitute parts in the same 8-SOIC package?

A: Yes. All listed substitute parts use the 8-SOIC (0.154", 3.90mm Width) surface mount package, ensuring identical PCB footprint and mounting compatibility with the 93LC66AX/SN.

Q: Do substitute parts require different firmware or software implementation?

A: No. All substitute parts implement the identical Microwire serial interface protocol at 2 MHz clock frequency with 6ms write cycle time. No firmware, software, or protocol modifications are required for substitution.

Q: Which substitute part offers the best inventory availability?

A: The 93LC66A-I/SN provides the highest inventory level at 3747 pieces, followed by the 93LC66A-E/SN at 3200 pieces and the 93AA66A-I/SN at 3199 pieces.