CAT24C01LI-G EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The CAT24C01LI-G is a 1Kbit EEPROM memory IC with I2C interface operating at 400 kHz, manufactured by onsemi in 8-DIP through-hole packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The CAT24C01LI-G serves applications requiring non-volatile serial memory with standard I2C protocol compatibility and operates across the industrial temperature range of -40°C to 85°C.

Key Parameters

Parameter	Value
Memory Size	1Kbit
Memory Organization	128 x 8
Memory Interface	I2C
Clock Frequency	400 kHz
Access Time	900 ns
Write Cycle Time	5ms
Voltage Supply Range	1.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package	8-DIP (0.300", 7.62mm)

Substitute Part Grouping Explanation

Substitution for the CAT24C01LI-G is determined by the following critical parameters:

Primary Compatibility Criteria:

Memory Size: 1Kbit (128 x 8 organization)
Memory Interface: I2C protocol
Mounting Type: Through Hole
Package Type: 8-DIP form factor
Voltage Supply Range: Minimum 1.7V support
Operating Temperature: -40°C to 85°C minimum

Secondary Performance Criteria:

Clock Frequency: 400 kHz or higher
Access Time: 900 ns or faster
Write Cycle Time: 5ms (standard across all candidates)

Substitute parts are grouped into two categories:

Category A - Direct Functional Equivalents (1Kbit, 400 kHz, Through-Hole 8-DIP): Parts maintaining identical memory capacity, I2C clock frequency, and through-hole DIP packaging with compatible voltage and temperature specifications.

Category B - Enhanced Performance Alternatives (1Kbit, Higher Clock Frequency, Through-Hole 8-DIP): Parts with 1Kbit capacity in 8-DIP through-hole packaging but operating at 1 MHz I2C frequency, offering faster access times while maintaining backward compatibility with 400 kHz I2C bus operation.

Category C - Surface Mount Alternative (2Kbit, Higher Frequency): The N24C02UDTG represents a higher-capacity option with enhanced performance but requires surface-mount assembly, making it suitable only for new designs with surface-mount capability.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temp	Package	Mounting Type	Product Status
CAT24C01LI-G	onsemi	1Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-DIP	Through Hole	Obsolete
24AA01-I/P	Microchip Technology	1Kbit	400 kHz	3500 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-DIP	Through Hole	Active
24LC01B-I/P	Microchip Technology	1Kbit	400 kHz	4.6 µs	2.5V ~ 5.5V	-40°C ~ 85°C	8-DIP	Through Hole	Active
24LC01B-E/P	Microchip Technology	1Kbit	400 kHz	4.6 µs	2.5V ~ 5.5V	-40°C ~ 125°C	8-DIP	Through Hole	Active
24LC01B/P	Microchip Technology	1Kbit	400 kHz	4.6 µs	2.5V ~ 5.5V	0°C ~ 70°C	8-DIP	Through Hole	Active
24LC01BH-I/P	Microchip Technology	1Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-DIP	Through Hole	Active
24LC01BH-E/P	Microchip Technology	1Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-DIP	Through Hole	Active
24LC014H-I/P	Microchip Technology	1Kbit	1 MHz	400 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-DIP	Through Hole	Active
AT24C01C-PUM	Microchip Technology	1Kbit	1 MHz	550 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-DIP	Through Hole	Active
AT24C01D-PUM	Microchip Technology	1Kbit	1 MHz	4.5 µs	1.7V ~ 3.6V	-40°C ~ 85°C	8-DIP	Through Hole	Active
N24C02UDTG	onsemi	2Kbit	1 MHz	450 ns	1.6V ~ 5.5V	-40°C ~ 85°C	8-VFSOP	Surface Mount	Active

Engineering Selection Recommendations

For Direct Replacement in Existing Through-Hole Designs:

The 24LC01BH-I/P and 24LC01BH-E/P are the primary substitutes, offering identical 1Kbit capacity, 400 kHz I2C operation, and 900 ns access time matching the CAT24C01LI-G performance profile. Both are manufactured by Microchip Technology with active product status and RoHS3 compliance. The 24LC01BH-E/P extends the operating temperature range to -40°C to 125°C, providing additional thermal margin for demanding applications. Both parts maintain the 8-DIP through-hole package and 5ms write cycle time.

For Applications with Lower Voltage Requirements:

The 24AA01-I/P maintains the full 1.7V to 5.5V supply voltage range of the original part while offering 1Kbit capacity and 400 kHz I2C operation. This part is verified as programmable and carries RoHS3 compliance. The slower 3500 ns access time is acceptable for non-time-critical applications.

For Enhanced Performance Requirements:

The AT24C01C-PUM and 24LC014H-I/P provide 1 MHz I2C clock frequency operation with faster access times (550 ns and 400 ns respectively) while maintaining 1Kbit capacity and 8-DIP through-hole packaging. These parts operate at higher I2C speeds while remaining backward compatible with 400 kHz bus operation. The AT24C01C-PUM maintains the 1.7V to 5.5V supply range of the original part.

For New Surface-Mount Designs:

The N24C02UDTG offers 2Kbit capacity with 1 MHz I2C operation and 450 ns access time in 8-VFSOP surface-mount packaging. This part is suitable only for new designs with surface-mount assembly capability and does not serve as a direct replacement for through-hole applications.

Compliance and Availability:

All active substitute parts carry RoHS3 compliance and REACH unaffected status. Inventory availability ranges from 847 to 10,300 units across the recommended substitutes, with 24LC01B-I/P offering the highest stock level at 10,300 pieces.

Frequently Asked Questions (FAQ)

Q: Can the 24LC01BH-I/P directly replace the CAT24C01LI-G in existing PCB designs?

A: Yes. The 24LC01BH-I/P maintains identical 1Kbit memory capacity, 400 kHz I2C clock frequency, 900 ns access time, and 8-DIP through-hole package dimensions. The voltage supply range (2.5V to 5.5V) is compatible with the original part's 1.7V to 5.5V range for applications operating above 2.5V. No PCB modifications are required.

Q: What is the difference between 24LC01B-I/P and 24LC01BH-I/P?

A: Both parts are 1Kbit I2C EEPROM in 8-DIP through-hole packaging with 400 kHz operation. The primary difference is access time: 24LC01B-I/P has 4.6 µs access time, while 24LC01BH-I/P has 900 ns access time. The 24LC01BH-I/P matches the CAT24C01LI-G access time specification. Both are active products with RoHS3 compliance.

Q: Why is the AT24C01D-PUM listed as a substitute if its voltage range is only 1.7V to 3.6V?

A: The AT24C01D-PUM is included as a substitute for applications operating within the 1.7V to 3.6V range. It provides 1Kbit capacity, 1 MHz I2C operation, and 8-DIP through-hole packaging. For applications requiring the full 5.5V upper limit, the AT24C01C-PUM or 24LC01BH-I/P are more appropriate selections.

Q: Can I use the N24C02UDTG as a substitute for the CAT24C01LI-G?

A: The N24C02UDTG is not a direct substitute due to its surface-mount 8-VFSOP package, which requires different PCB layout and assembly processes than the through-hole 8-DIP package. Additionally, it provides 2Kbit capacity rather than 1Kbit. The N24C02UDTG is suitable only for new designs with surface-mount capability.

Q: Which substitute offers the best performance improvement over the CAT24C01LI-G?

A: The 24LC014H-I/P and AT24C01C-PUM both offer 1 MHz I2C clock frequency with faster access times (400 ns and 550 ns respectively) compared to the original 900 ns specification. Both maintain 1Kbit capacity and 8-DIP through-hole packaging. The AT24C01C-PUM additionally maintains the 1.7V to 5.5V supply voltage range of the original part.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All active substitute parts listed carry RoHS3 compliance certification. The original CAT24C01LI-G is classified as obsolete and does not carry RoHS3 status.

Q: What is the temperature range consideration when selecting a substitute?

A: The CAT24C01LI-G operates from -40°C to 85°C. Most substitutes maintain this range. The 24LC01B-E/P and 24LC01BH-E/P extend the upper limit to 125°C, providing additional thermal margin. The 24LC01B/P operates only from 0°C to 70°C and is suitable for commercial temperature range applications only.

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