93LC66A/P EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93LC66A/P is a 4Kbit EEPROM memory integrated circuit manufactured by Microchip Technology, utilizing Microwire serial interface protocol. This non-volatile memory device operates at 2 MHz clock frequency with a memory organization of 512 x 8 bits and is housed in an 8-PDIP through-hole package. The part maintains active product status and is RoHS3 compliant. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the allowed parameter ranges for this EEPROM category.

Substiute Parts

93LC66A/P

Microchip TechnologyIn Stock: 219593LC66A/P Datasheet

Current PartRFQ

93AA66A-I/P

Microchip TechnologyIn Stock: 125293AA66A-I/P Datasheet

MFR RecommendedRFQ

93LC66A-I/P

Microchip TechnologyIn Stock: 376093LC66A-I/P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 93LC66A/P are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Memory capacity, organization, and interface protocol must remain identical (4Kbit, 512 x 8, Microwire). Clock frequency and write cycle time specifications must match exactly (2 MHz, 6ms). Package type and mounting method must be equivalent (8-DIP through-hole). The voltage supply range and operating temperature range define the allowable substitution boundaries. Parts with expanded voltage or temperature ranges remain compatible with the original specification when the original range is contained within the substitute range.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts maintain active product status and RoHS3 compliance equivalent to the main part. The 93AA66A-I/P extends the voltage supply range to 1.8V minimum and expands the operating temperature range to -40°C ~ 85°C, providing broader environmental compatibility while remaining functionally compatible with the original 93LC66A/P specification. The 93LC66A-I/P maintains identical voltage supply range to the main part (2.5V ~ 5.5V) while extending the operating temperature range to -40°C ~ 85°C. Selection between substitute parts depends on the specific voltage and temperature requirements of the target application. All three parts are manufactured by Microchip Technology and share identical memory capacity, organization, interface protocol, and package specifications.

Frequently Asked Questions (FAQ)

Q: Can 93AA66A-I/P replace 93LC66A/P in all applications?

A: The 93AA66A-I/P is functionally compatible with the 93LC66A/P for applications operating within the original specification range (2.5V ~ 5.5V, 0°C ~ 70°C). The substitute part offers extended voltage and temperature ranges, making it suitable for applications requiring operation below 2.5V or outside the 0°C ~ 70°C range.

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

A: Both parts share identical voltage supply range (2.5V ~ 5.5V) and memory specifications. The 93LC66A-I/P extends the operating temperature range to -40°C ~ 85°C compared to the original 0°C ~ 70°C specification. The package and mounting type remain identical.

Q: Are all three parts pin-compatible?

A: Yes. All three parts use the 8-DIP (0.300", 7.62mm) through-hole package with identical pin configuration, enabling direct mechanical and electrical substitution on printed circuit boards.

Q: Do substitute parts maintain the same write cycle time?

A: Yes. All substitute parts maintain the 6ms write cycle time specification, ensuring equivalent performance characteristics for memory write operations.

Q: Which substitute part should be selected for extended temperature applications?

A: Both 93AA66A-I/P and 93LC66A-I/P support the extended temperature range of -40°C ~ 85°C. Selection between these two depends on voltage supply requirements. The 93AA66A-I/P supports operation down to 1.8V, while the 93LC66A-I/P maintains the 2.5V minimum voltage specification.