CAT93C66VI-G EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The CAT93C66VI-G is a 4Kbit EEPROM memory IC manufactured by onsemi, featuring Microwire serial interface protocol and 2 MHz clock frequency. This non-volatile memory device is packaged in 8-SOIC surface mount configuration and operates across a wide supply voltage range of 1.8V to 5.5V with industrial temperature range (-40°C to 85°C). The part is currently active in production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when design specifications allow for compatible alternatives from different manufacturers that meet identical electrical and mechanical requirements.

Substiute Parts

CAT93C66VI-G

onsemiIn Stock: 2285CAT93C66VI-G Datasheet

Current PartRFQ

CAV93C66VE-GT3

onsemiIn Stock: 3674CAV93C66VE-GT3 Datasheet

SimilarRFQ

93AA66CT-I/SN

Microchip TechnologyIn Stock: 5017493AA66CT-I/SN Datasheet

SimilarRFQ

93AA66C-I/SN

Microchip TechnologyIn Stock: 230593AA66C-I/SN Datasheet

SimilarRFQ

AT93C66B-SSHM-B

Microchip TechnologyIn Stock: 12308AT93C66B-SSHM-B Datasheet

SimilarRFQ

M93C66-RMN3TP/K

STMicroelectronicsIn Stock: 16005M93C66-RMN3TP/K Datasheet

SimilarRFQ

M93C66-WMN6P

STMicroelectronicsIn Stock: 1628M93C66-WMN6P Datasheet

SimilarRFQ

M93C66-WMN6TP

STMicroelectronicsIn Stock: 35132M93C66-WMN6TP Datasheet

SimilarRFQ

M93C76-RMN3TP/K

STMicroelectronicsIn Stock: 5031M93C76-RMN3TP/K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CAT93C66VI-G is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

• Memory Size: 4Kbit (exact match required)
• Memory Organization: 512 x 8, 256 x 16 (exact match required)
• Package / Case: 8-SOIC form factor (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Memory Interface: Microwire protocol (exact match required)

Secondary Compatibility Parameters:

• Supply Voltage Range: Must encompass or match 1.8V ~ 5.5V minimum requirement
• Operating Temperature: Must support minimum -40°C ~ 85°C range
• Clock Frequency: 2 MHz or higher acceptable
• RoHS Compliance: ROHS3 Compliant required

Parts meeting all primary criteria and secondary compatibility parameters are classified as direct electrical and mechanical substitutes. Variations in packaging format (Tube, Cut Tape, Tape & Reel), manufacturer, or extended temperature/automotive qualifications do not affect functional substitutability when primary parameters align.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (Microwire Interface, Identical Electrical Characteristics):

The following parts are direct functional substitutes for CAT93C66VI-G based on matching memory size, organization, interface protocol, and package specifications:

• M93C66-RMN3TP/K (STMicroelectronics): Matches all primary parameters with extended operating temperature range (-40°C to 125°C) and AEC-Q100 automotive qualification. Suitable for applications requiring automotive-grade reliability.

• M93C66-WMN6TP (STMicroelectronics): Matches all primary parameters with Cut Tape packaging format. Supply voltage range 2.5V ~ 5.5V is compatible with designs operating above 2.5V.

• M93C76-RMN3TP/K (STMicroelectronics): Matches all primary parameters with extended operating temperature range (-40°C to 125°C) and AEC-Q100 automotive qualification. Tape & Reel packaging format.

• 93AA66CT-I/SN (Microchip Technology): Matches all primary parameters with 3 MHz clock frequency (higher than 2 MHz requirement). Cut Tape & Digi-Reel® packaging format.

• 93AA66C-I/SN (Microchip Technology): Matches all primary parameters with 3 MHz clock frequency. Tube packaging format identical to CAT93C66VI-G.

• CAV93C66VE-GT3 (onsemi): Same manufacturer as primary part. Matches all primary parameters with extended operating temperature range (-40°C to 125°C) and AEC-Q100 automotive qualification. Tape & Reel packaging format.

Conditional Substitute (Interface Protocol Difference):

• AT93C66B-SSHM-B (Microchip Technology): Implements 3-Wire Serial interface instead of Microwire protocol. This part is functionally equivalent only for applications where the design can accommodate 3-Wire Serial protocol. Not recommended as a direct drop-in replacement without circuit redesign.

Packaging Format Considerations:

Selection between Tube, Cut Tape & Digi-Reel®, and Tape & Reel formats depends on manufacturing process requirements. All formats contain identical die and electrical characteristics; format selection is driven by assembly line automation and inventory management practices.

Frequently Asked Questions (FAQ)

Q: Can I substitute CAT93C66VI-G with M93C66-WMN6P?

A: Yes, with voltage supply consideration. M93C66-WMN6P is electrically and mechanically compatible. However, its supply voltage range is 2.5V ~ 5.5V versus CAT93C66VI-G's 1.8V ~ 5.5V. If your design operates at voltages below 2.5V, this substitute is not suitable. For designs operating at 2.5V and above, this part is a direct substitute.

Q: What is the difference between Microwire and 3-Wire Serial interfaces?

A: Microwire and 3-Wire Serial are different serial communication protocols. AT93C66B-SSHM-B uses 3-Wire Serial protocol while CAT93C66VI-G uses Microwire. These protocols have different timing, signal sequencing, and control requirements. Substitution requires circuit redesign and firmware modification. Direct substitution is not possible without protocol conversion.

Q: Are automotive-qualified parts (AEC-Q100) suitable replacements for industrial-grade parts?

A: Yes. Automotive-qualified parts meet or exceed industrial specifications. Parts like M93C66-RMN3TP/K and M93C76-RMN3TP/K carry AEC-Q100 qualification and extended temperature ranges (-40°C to 125°C), making them suitable for any application requiring CAT93C66VI-G's industrial specifications (-40°C to 85°C).

Q: Does packaging format affect electrical performance?

A: No. Tube, Cut Tape & Digi-Reel®, and Tape & Reel formats contain identical silicon die and deliver identical electrical performance. Packaging format selection is determined by manufacturing process automation and supply chain logistics, not by electrical requirements.

Q: Can I use 93AA66CT-I/SN with its 3 MHz clock frequency instead of 2 MHz?

A: Yes. The 3 MHz clock frequency of 93AA66CT-I/SN exceeds the 2 MHz requirement of CAT93C66VI-G. Higher clock frequency is backward compatible with designs expecting 2 MHz operation. The part will function correctly in any circuit designed for CAT93C66VI-G.

Q: What does ROHS3 compliance mean for substitution?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements. All listed substitute parts carry ROHS3 compliance, ensuring environmental and regulatory compatibility with CAT93C66VI-G for applications requiring ROHS certification.

Q: Is MSL (Moisture Sensitivity Level) rating important for substitution?

A: Yes, for storage and handling. CAT93C66VI-G carries MSL 1 (Unlimited), meaning no moisture precautions are required. Most substitutes also carry MSL 1. AT93C66B-SSHM-B carries MSL 3 (168 Hours), requiring moisture control during storage and handling. Verify MSL compatibility with your manufacturing process requirements.