CAT64LC40WI EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The CAT64LC40WI is a 4Kbit EEPROM memory integrated circuit manufactured by onsemi, featuring SPI serial interface operation at 1 MHz clock frequency. This non-volatile memory device is housed in an 8-SOIC surface mount package and operates across a supply voltage range of 2.5V to 6V with an operating temperature range of -40°C to 85°C.

The CAT64LC40WI is classified as an obsolete product. Identification of equivalent and substitute parts is necessary to maintain design continuity, ensure component availability for production, and support long-term system maintenance and repair operations.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile EEPROM
Memory Size	4Kbit
Memory Organization	256 x 16
Memory Interface	SPI
Clock Frequency	1 MHz
Write Cycle Time	5ms
Supply Voltage Range	2.5V ~ 6V
Operating Temperature Range	-40°C ~ 85°C
Package Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the CAT64LC40WI is determined by strict equivalence across the following critical parameters:

Memory Specifications: The substitute part must provide identical memory capacity (4Kbit), organization (256 x 16), and format (EEPROM non-volatile technology).

Interface and Timing: The substitute part must support SPI serial interface with 1 MHz clock frequency operation and maintain the 5ms write cycle time specification.

Electrical Characteristics: The substitute part must operate within the identical supply voltage range (2.5V ~ 6V) and temperature range (-40°C ~ 85°C).

Physical Package: The substitute part must use the 8-SOIC surface mount package with 0.154" (3.90mm) width to ensure mechanical and electrical compatibility with existing PCB designs.

The CAT64LC40WI-G meets all substitution criteria and is classified as an active product, providing continued component availability.

Parameter Comparison

Parameter	CAT64LC40WI (Main Part)	CAT64LC40WI-G (Substitute)	Match Status
Manufacturer	onsemi	Catalyst Semiconductor Inc.	Different Manufacturer
Memory Type	Non-Volatile EEPROM	Non-Volatile EEPROM	Equivalent
Memory Size	4Kbit	4Kbit	Equivalent
Memory Organization	256 x 16	256 x 16	Equivalent
Memory Interface	SPI	SPI	Equivalent
Clock Frequency	1 MHz	1 MHz	Equivalent
Write Cycle Time	5ms	5ms	Equivalent
Supply Voltage Range	2.5V ~ 6V	2.5V ~ 6V	Equivalent
Operating Temperature Range	-40°C ~ 85°C	-40°C ~ 85°C	Equivalent
Package Type	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Product Status	Obsolete	Active	Substitute is Active
Moisture Sensitivity Level	MSL 1 (Unlimited)	MSL 3 (168 Hours)	Different MSL Rating

Engineering Selection Recommendations

The CAT64LC40WI-G is the direct substitute for the obsolete CAT64LC40WI. Both parts share identical electrical specifications, memory capacity, interface protocol, and physical package dimensions. The substitute part is manufactured by Catalyst Semiconductor Inc. and maintains active product status, ensuring continued availability for procurement and production operations.

The primary distinction between the main part and substitute is product status: the CAT64LC40WI is obsolete while the CAT64LC40WI-G is active. The substitute part carries ECCN classification EAR99 and HTSUS code 8542.32.0051, indicating standard commercial classification.

Moisture sensitivity level differs between the two parts: the main part carries MSL 1 (unlimited moisture exposure tolerance) while the substitute carries MSL 3 (168-hour moisture exposure limit). This difference requires consideration in storage, handling, and assembly processes to maintain component reliability.

Frequently Asked Questions (FAQ)

Q: Can the CAT64LC40WI-G directly replace the CAT64LC40WI in existing designs?

A: Yes. The CAT64LC40WI-G provides electrical and mechanical equivalence across all critical parameters: 4Kbit EEPROM capacity, 256 x 16 organization, SPI interface, 1 MHz clock frequency, 2.5V to 6V supply voltage range, -40°C to 85°C operating temperature, and 8-SOIC surface mount package. Pin-to-pin compatibility and functional operation are maintained.

Q: What is the significance of the different moisture sensitivity levels?

A: The CAT64LC40WI carries MSL 1 (unlimited moisture exposure), while the CAT64LC40WI-G carries MSL 3 (168-hour moisture exposure limit). MSL 3 components require controlled storage conditions and have a limited shelf life after moisture barrier bag opening. Assembly processes must be completed within the specified timeframe to prevent moisture absorption and potential device failure.

Q: Are there any compliance or certification differences between these parts?

A: The CAT64LC40WI is classified as OBSOLETE with REACH Unaffected status. The CAT64LC40WI-G is an active product with ECCN EAR99 classification and HTSUS code 8542.32.0051. The substitute part carries REACH Vendor Undefined status. Compliance requirements should be verified against specific application and regulatory requirements.

Q: Is the 8-SOIC package identical between both parts?

A: Yes. Both parts use the 8-SOIC surface mount package with 0.154" (3.90mm) width specification. PCB footprints, land patterns, and assembly processes remain unchanged.

Q: What is the write cycle time for both parts?

A: Both the CAT64LC40WI and CAT64LC40WI-G specify a 5ms write cycle time for word and page operations. Timing-critical applications will experience identical performance characteristics.

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