93C66C-E/P EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93C66C-E/P is a 4Kbit EEPROM memory integrated circuit manufactured by Microchip Technology, designed for non-volatile data storage applications requiring Microwire serial interface communication. This component operates at 3 MHz clock frequency with a 2ms write cycle time and is housed in an 8-PDIP through-hole package. The part maintains Active product status and is RoHS3 compliant, making it suitable for current industrial and commercial applications. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the same memory category and packaging standard.

Substiute Parts

93C66C-E/P

Microchip TechnologyIn Stock: 68293C66C-E/P Datasheet

Current PartRFQ

93C66-E/P

Microchip TechnologyIn Stock: 129093C66-E/P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 93C66C-E/P is determined by strict equivalence across the following critical parameters:

• Memory capacity and organization (4Kbit, 512 x 8 or 256 x 16 configuration)
• Serial interface protocol (Microwire standard)
• Supply voltage range (4.5V ~ 5.5V)
• Operating temperature range (-40°C ~ 125°C)
• Physical package format (8-DIP through-hole)
• Write cycle time specification (2ms)

The 93C66-E/P qualifies as a manufacturer-recommended substitute based on identical memory specifications, interface protocol, voltage requirements, temperature range, and package configuration. Clock frequency variation (2 MHz vs. 3 MHz) does not preclude substitution, as the lower frequency specification remains compatible with applications designed for the primary part.

Parameter Comparison

Engineering Selection Recommendations

Both the 93C66C-E/P and 93C66-E/P maintain Active product status with ROHS3 compliance and REACH unaffected designation, confirming current manufacturing availability and regulatory alignment. The substitute part 93C66-E/P is manufacturer-recommended by Microchip Technology, indicating validated functional equivalence within the 93C66 series architecture.

Selection between these parts should be based on application clock frequency requirements. The 93C66C-E/P operates at 3 MHz maximum clock frequency, while the 93C66-E/P operates at 2 MHz maximum. Applications requiring the full 3 MHz performance specification must use the 93C66C-E/P. Applications with clock frequency requirements at or below 2 MHz may use either part interchangeably, with the 93C66-E/P offering higher current inventory availability (1225 pcs vs. 669 pcs).

Both parts are housed in identical 8-DIP through-hole packages with matching pinout configurations, enabling direct board-level substitution without layout modification.

Frequently Asked Questions (FAQ)

Q: Can the 93C66-E/P replace the 93C66C-E/P in all applications?

A: The 93C66-E/P is compatible with applications operating at clock frequencies of 2 MHz or lower. Applications requiring 3 MHz clock frequency operation must use the 93C66C-E/P. Both parts share identical memory capacity, interface protocol, voltage specifications, and package configuration.

Q: Are there pinout differences between these parts?

A: No. Both the 93C66C-E/P and 93C66-E/P use the 8-DIP package with identical pinout configuration, enabling direct board-level substitution without PCB modification.

Q: What is the significance of the clock frequency difference?

A: The clock frequency specification defines the maximum serial communication speed supported by each part. The 93C66C-E/P supports up to 3 MHz, while the 93C66-E/P supports up to 2 MHz. Lower clock frequency parts remain compatible with applications designed for higher frequencies, as they operate within the specified timing envelope.

Q: Do both parts meet current regulatory requirements?

A: Yes. Both the 93C66C-E/P and 93C66-E/P are ROHS3 compliant and REACH unaffected, confirming compliance with current environmental and regulatory standards.

Q: What is the difference in write cycle time between these parts?

A: Both parts specify identical 2ms write cycle time for word and page operations. No performance difference exists in write operation timing.

Q: Are both parts available in the same packaging options?

A: Both parts are supplied in 8-PDIP tube packaging with identical physical dimensions (0.300", 7.62mm). No packaging variation exists between these parts.