CAT24C01WI-GT3 Equivalent & Substitute Parts

Part Overview

The CAT24C01WI-GT3 is a 1Kbit EEPROM memory IC with I2C interface operating at 400 kHz, manufactured by onsemi in 8-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The device provides non-volatile memory storage suitable for applications requiring low-capacity data retention with standard I2C serial communication.

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
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution for the CAT24C01WI-GT3 is determined by the following critical parameters:

Primary Substitution Criteria:

Memory Size: 1Kbit (128 x 8 organization)
Memory Interface: I2C protocol
Clock Frequency: 400 kHz minimum
Package / Case: 8-SOIC form factor
Voltage Supply Range: Must encompass or overlap 1.7V ~ 5.5V
Operating Temperature: Must support -40°C ~ 85°C range

Acceptable Variations:

Access Time: May vary (900 ns or higher acceptable for timing-non-critical applications)
Write Cycle Time: 5ms standard across all candidates
Mounting Type: Surface Mount required
Product Status: Active status preferred for long-term availability

Substitute parts meeting these criteria maintain functional and electrical compatibility while ensuring PCB layout compatibility through identical packaging.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temp	Package	Product Status
CAT24C01WI-GT3	onsemi	1Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Obsolete
24AA01-I/SN	Microchip Technology	1Kbit	400 kHz	3500 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
24AA01/SN	Microchip Technology	1Kbit	400 kHz	3500 ns	1.7V ~ 5.5V	0°C ~ 70°C	8-SOIC	Active
24AA014-I/SN	Microchip Technology	1Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
24AA014H-I/SN	Microchip Technology	1Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
24AA01H-I/SN	Microchip Technology	1Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
24AA01T-I/SN	Microchip Technology	1Kbit	400 kHz	3500 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
24AA01T/SN	Microchip Technology	1Kbit	400 kHz	3500 ns	1.7V ~ 5.5V	0°C ~ 70°C	8-SOIC	Active
24LC014-I/SN	Microchip Technology	1Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
24LC014HT-E/SN	Microchip Technology	1Kbit	1 MHz	400 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Active
N24C02UDTG	onsemi	2Kbit	1 MHz	450 ns	1.6V ~ 5.5V	-40°C ~ 85°C	8-VFSOP	Active

Engineering Selection Recommendations

Primary Substitutes (Direct Replacement):

Parts 24AA014-I/SN, 24AA014H-I/SN, and 24AA01H-I/SN from Microchip Technology provide direct functional equivalence with identical memory size, I2C interface, 400 kHz clock frequency, 900 ns access time, and 8-SOIC packaging. All three maintain the -40°C ~ 85°C operating temperature range and 1.7V ~ 5.5V supply voltage compatibility. These parts carry Active product status with RoHS3 compliance, ensuring long-term availability and regulatory alignment.

Secondary Substitutes (Compatible with Timing Tolerance):

Parts 24AA01-I/SN, 24AA01T-I/SN, and 24AA01T/SN offer functional compatibility with extended access time (3500 ns). These are suitable for applications where timing margins permit slower memory access. All maintain 1Kbit capacity, I2C interface, 400 kHz operation, and 8-SOIC packaging. Temperature range varies: 24AA01-I/SN and 24AA01T-I/SN support -40°C ~ 85°C, while 24AA01/SN and 24AA01T/SN operate at 0°C ~ 70°C.

Voltage-Constrained Substitute:

Part 24LC014-I/SN provides equivalent functionality but with reduced minimum supply voltage (2.5V ~ 5.5V). This part is suitable only for applications where supply voltage remains above 2.5V. It maintains 1Kbit capacity, 400 kHz I2C operation, 900 ns access time, and 8-SOIC packaging with -40°C ~ 85°C temperature range.

Enhanced Performance Option:

Part 24LC014HT-E/SN offers superior performance with 1 MHz clock frequency and 400 ns access time, supporting extended temperature range (-40°C ~ 125°C). However, minimum supply voltage is 2.5V. This part is applicable only when higher speed and wider temperature operation are required and supply voltage constraints are acceptable.

Non-Compatible Option:

Part N24C02UDTG, while manufactured by onsemi, is not a direct substitute due to doubled memory size (2Kbit), different package (8-VFSOP), and higher clock frequency (1 MHz). This part is suitable only for applications requiring increased memory capacity with compatible I2C interface.

Frequently Asked Questions (FAQ)

Q: Can 24AA01-I/SN replace CAT24C01WI-GT3 in all applications?

A: 24AA01-I/SN is functionally compatible for I2C EEPROM applications requiring 1Kbit storage. The extended access time (3500 ns vs. 900 ns) is acceptable in most applications. Verify timing requirements in your specific design before substitution.

Q: What is the difference between 24AA014-I/SN and 24AA01H-I/SN?

A: Both parts are electrically identical with 1Kbit capacity, 400 kHz I2C operation, 900 ns access time, and 8-SOIC packaging. The primary difference is DiGi-Electronics Programmable verification status. 24AA014-I/SN is verified; 24AA01H-I/SN is not verified. Both are Active status parts suitable for replacement.

Q: Is 24LC014-I/SN compatible with 1.7V supply voltage?

A: No. 24LC014-I/SN operates at 2.5V ~ 5.5V minimum supply voltage. It is not compatible with applications requiring 1.7V operation. Use 24AA014-I/SN, 24AA01H-I/SN, or 24AA01-I/SN for 1.7V minimum supply requirements.

Q: Can I use 24LC014HT-E/SN in place of CAT24C01WI-GT3?

A: 24LC014HT-E/SN provides enhanced performance (1 MHz clock, 400 ns access time, -40°C ~ 125°C temperature range) but requires minimum 2.5V supply voltage. Use this part only if your application supports 2.5V minimum supply and benefits from higher speed or extended temperature operation.

Q: Why is N24C02UDTG listed as a substitute if it has different memory size?

A: N24C02UDTG is listed for reference only. It is not a direct substitute due to 2Kbit capacity (vs. 1Kbit), different package (8-VFSOP vs. 8-SOIC), and 1 MHz operation. It is applicable only for new designs requiring increased memory capacity with compatible I2C interface.

Q: What packaging differences exist among substitute parts?

A: All recommended substitutes use 8-SOIC (0.154", 3.90mm Width) packaging, identical to CAT24C01WI-GT3. N24C02UDTG uses 8-VFSOP (0.091", 2.30mm Width) and is not pin-compatible. Verify PCB footprint compatibility before part selection.

Q: Are all substitute parts RoHS3 compliant?

A: All Microchip Technology substitutes (24AA and 24LC series) carry RoHS3 compliance. onsemi N24C02UDTG is RoHS3 compliant. Verify compliance documentation for your specific procurement requirements.

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