93LC66AX-I/SN EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93LC66AX-I/SN is a 4Kbit non-volatile EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and 8-SOIC surface mount packaging. This device operates at 2 MHz clock frequency with a 6ms write cycle time and supports supply voltages from 2.5V to 5.5V across an industrial temperature range of -40°C to 85°C. The part is ROHS3 compliant and currently in active production status with 1087 units in stock. Equivalent and substitute parts are identified based on matching memory capacity, interface protocol, package type, and electrical operating parameters to ensure direct functional replacement in circuit applications.

Key Parameters

Parameter	Specification
Memory Size	4Kbit
Memory Organization	512 x 8
Memory Interface	Microwire
Clock Frequency	2 MHz
Write Cycle Time	6ms
Voltage Supply Range	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 93LC66AX-I/SN are qualified based on the following critical parameters that determine functional interchangeability:

Core Matching Criteria:

Memory capacity: 4Kbit with 512 x 8 organization
Serial interface protocol: Microwire
Clock frequency: 2 MHz
Write cycle time: 6ms
Package: 8-SOIC surface mount
Compliance: ROHS3 and REACH unaffected status

Substitution Logic: The 93LC66AX-I/SN can be replaced by parts from the 93LC66 and 93AA66 series that maintain identical memory specifications and Microwire interface. Variations in supply voltage range and operating temperature range are permitted when the substitute part's specifications encompass or match the original part's operating envelope. All substitute parts listed are manufactured by Microchip Technology and maintain the same package footprint and pinout compatibility.

Parameter Comparison

Parameter	93LC66AX-I/SN	93AA66A-I/SN	93LC66A-E/SN	93LC66A-I/SN
Memory Size	4Kbit	4Kbit	4Kbit	4Kbit
Memory Organization	512 x 8	512 x 8	512 x 8	512 x 8
Memory Interface	Microwire	Microwire	Microwire	Microwire
Clock Frequency	2 MHz	2 MHz	2 MHz	2 MHz
Write Cycle Time	6ms	6ms	6ms	6ms
Voltage Supply Range	2.5V ~ 5.5V	1.8V ~ 5.5V	2.5V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts maintain active production status with Microchip Technology and are ROHS3 compliant. The 93AA66A-I/SN offers extended lower voltage operation down to 1.8V, making it suitable for low-power applications while maintaining full compatibility with the original part's 2.5V minimum specification. The 93LC66A-E/SN extends the operating temperature range to 125°C, providing thermal margin for high-temperature environments while maintaining the original 2.5V to 5.5V supply range. The 93LC66A-I/SN provides direct parameter matching with the 93LC66AX-I/SN across all electrical and thermal specifications. Selection among these substitutes depends on application-specific requirements for supply voltage range and operating temperature envelope.

Frequently Asked Questions (FAQ)

Q: Can the 93AA66A-I/SN replace the 93LC66AX-I/SN in all applications? A: The 93AA66A-I/SN is functionally compatible with identical memory capacity, interface protocol, and package. The extended lower voltage specification (1.8V minimum) makes it suitable for replacement in applications operating at 2.5V or higher. Verify your circuit's minimum supply voltage requirement before substitution.

Q: What is the difference between the 93LC66A-E/SN and 93LC66A-I/SN? A: Both parts are electrically identical with matching 2.5V to 5.5V supply range and 4Kbit memory capacity. The 93LC66A-E/SN operates across -40°C to 125°C, while the 93LC66A-I/SN operates across -40°C to 85°C. Select the E-grade variant for applications requiring extended high-temperature operation.

Q: Are all substitute parts pin-compatible with the 93LC66AX-I/SN? A: Yes. All substitute parts use the 8-SOIC package with identical 0.154" width and 3.90mm body dimensions, ensuring direct PCB footprint compatibility and pinout alignment.

Q: Do all parts meet the same compliance standards? A: Yes. All listed parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with matching HTSUS code 8542.32.0051.

Q: Which substitute part should I select for new designs? A: For new designs, the 93LC66A-I/SN provides direct parameter matching with the original part. If extended temperature operation is required, select the 93LC66A-E/SN. If low-voltage operation below 2.5V is needed, select the 93AA66A-I/SN.

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