CAT24C01YI-GT3 Equivalent & Substitute Parts

Part Overview

The CAT24C01YI-GT3 is a 1Kbit EEPROM memory IC manufactured by onsemi, featuring I2C interface with 400 kHz clock frequency and 900 ns access time in an 8-TSSOP package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The device operates across a wide voltage range of 1.7V to 5.5V and supports industrial temperature ranges from -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
Package Type	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution for the CAT24C01YI-GT3 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Memory Size: 1Kbit (exact match required)
Memory Organization: 128 x 8 (exact match required)
Memory Interface: I2C (exact match required)
Clock Frequency: 400 kHz (exact match required)
Package Type: 8-TSSOP with 0.173" width, 4.40mm Width (exact match required)
Voltage Supply Range: Must encompass or match 1.7V ~ 5.5V
Operating Temperature: Must support -40°C ~ 85°C minimum

Acceptable Variations:

Access Time: May be equal to or faster than 900 ns
Write Cycle Time: May be equal to or faster than 5ms
Manufacturer: Different manufacturers acceptable if all parameters match
Product Status: Active parts preferred over obsolete for long-term availability
Packaging Format: Tube or Tape & Reel acceptable for equivalent functionality

Parts that deviate from critical matching parameters are listed separately and require design review before implementation.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Memory Organization	Clock Frequency	Access Time	Write Cycle Time	Voltage Supply	Operating Temperature	Package	Product Status
CAT24C01YI-GT3	onsemi	1Kbit	128 x 8	400 kHz	900 ns	5ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Obsolete
24AA01-I/ST	Microchip Technology	1Kbit	128 x 8	400 kHz	3500 ns	5ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA014-I/ST	Microchip Technology	1Kbit	128 x 8	400 kHz	900 ns	5ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA014H-I/ST	Microchip Technology	1Kbit	128 x 8	400 kHz	900 ns	5ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA01H-I/ST	Microchip Technology	1Kbit	128 x 8	400 kHz	900 ns	5ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA01T-I/ST	Microchip Technology	1Kbit	128 x 8	400 kHz	3500 ns	5ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24LC014-I/ST	Microchip Technology	1Kbit	128 x 8	400 kHz	900 ns	5ms	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24LC014T-E/ST	Microchip Technology	1Kbit	128 x 8	400 kHz	900 ns	5ms	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
24LC014T-I/ST	Microchip Technology	1Kbit	128 x 8	400 kHz	900 ns	5ms	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24LC01B-E/ST	Microchip Technology	1Kbit	128 x 8	400 kHz	4.6 µs	5ms	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
N24C02UDTG	onsemi	2Kbit	128 x 16	1 MHz	450 ns	4ms	1.6V ~ 5.5V	-40°C ~ 85°C	8-VFSOP	Active

Engineering Selection Recommendations

Direct Equivalents (Recommended for Immediate Substitution):

The following parts provide direct functional equivalence with identical electrical and mechanical specifications:

24AA014-I/ST (Microchip Technology): Exact parameter match with 900 ns access time. Active product status ensures long-term availability. RoHS3 compliant.
24AA014H-I/ST (Microchip Technology): Exact parameter match with 900 ns access time. Active product status. RoHS3 compliant.
24AA01H-I/ST (Microchip Technology): Exact parameter match with 900 ns access time. Active product status. RoHS3 compliant.

Acceptable Substitutes (Slower Access Time):

These parts match all critical parameters but feature slower access times. Acceptable for applications where 3500 ns or 4.6 µs access time does not impact system performance:

24AA01-I/ST (Microchip Technology): 3500 ns access time. Identical voltage and temperature ranges. Active product status. RoHS3 compliant.
24AA01T-I/ST (Microchip Technology): 3500 ns access time. Tape & Reel packaging. Active product status. RoHS3 compliant.
24LC01B-E/ST (Microchip Technology): 4.6 µs access time. Extended temperature range to 125°C. Minimum voltage 2.5V (higher than original). Active product status. RoHS3 compliant.

Conditional Substitutes (Voltage Range Limitation):

These parts match all critical parameters but have a higher minimum supply voltage of 2.5V instead of 1.7V. Suitable only for applications where the minimum supply voltage is 2.5V or higher:

24LC014-I/ST (Microchip Technology): 900 ns access time. 2.5V minimum supply voltage. Active product status. RoHS3 compliant.
24LC014T-E/ST (Microchip Technology): 900 ns access time. Extended temperature range to 125°C. 2.5V minimum supply voltage. Active product status. RoHS3 compliant.
24LC014T-I/ST (Microchip Technology): 900 ns access time. 2.5V minimum supply voltage. Active product status. RoHS3 compliant. DiGi-Electronics Programmable Verified.

Not Recommended (Parameter Deviation):

N24C02UDTG (onsemi): 2Kbit memory size and 128 x 16 organization deviate from 1Kbit specification. 1 MHz clock frequency exceeds 400 kHz requirement. 8-VFSOP package differs from 8-TSSOP. Not suitable for direct substitution.

Frequently Asked Questions (FAQ)

Q: Can I use 24AA014-I/ST as a direct replacement for CAT24C01YI-GT3?

A: Yes. The 24AA014-I/ST matches all critical parameters: 1Kbit memory size, 128 x 8 organization, I2C interface, 400 kHz clock frequency, 900 ns access time, 8-TSSOP package, and 1.7V to 5.5V supply voltage range. It is manufactured by Microchip Technology and maintains active product status with RoHS3 compliance.

Q: What is the difference between 24AA014-I/ST and 24AA01-I/ST?

A: Both parts are 1Kbit I2C EEPROM in 8-TSSOP packages with identical voltage and temperature ranges. The primary difference is access time: 24AA014-I/ST provides 900 ns access time matching the original specification, while 24AA01-I/ST provides 3500 ns access time. The 24AA014-I/ST is preferred if timing-critical applications require the faster access time.

Q: Why do 24LC014 variants have a higher minimum supply voltage?

A: The 24LC014 series specifies a minimum supply voltage of 2.5V, compared to 1.7V for the original CAT24C01YI-GT3 and 24AA01/24AA014 series. These parts are suitable only for applications where the minimum supply voltage is 2.5V or higher. Verify your power supply specifications before selecting this variant.

Q: Can I use 24LC014T-E/ST in place of CAT24C01YI-GT3?

A: The 24LC014T-E/ST is functionally compatible for I2C EEPROM applications with matching memory size, organization, and clock frequency. However, it has a higher minimum supply voltage (2.5V vs. 1.7V) and extended operating temperature range (-40°C to 125°C vs. -40°C to 85°C). Use this part only if your application operates at 2.5V minimum supply voltage or higher.

Q: What does "DiGi-Electronics Programmable Verified" mean?

A: This designation indicates that the part has been verified as programmable through DiGi-Electronics' testing and validation process. The 24LC014T-I/ST carries this verification, providing additional assurance of functionality. Parts without this designation have not undergone this specific verification but remain functionally equivalent based on manufacturer specifications.

Q: Is N24C02UDTG a suitable substitute?

A: No. The N24C02UDTG is not suitable for direct substitution. It features 2Kbit memory capacity with 128 x 16 organization, compared to the 1Kbit/128 x 8 specification of the CAT24C01YI-GT3. Additionally, it operates at 1 MHz clock frequency rather than 400 kHz, and uses an 8-VFSOP package instead of 8-TSSOP. Design modifications would be required to implement this part.

Q: What packaging options are available for equivalent parts?

A: Equivalent 1Kbit I2C EEPROM parts in 8-TSSOP packages are available in multiple packaging formats: Tube packaging (standard for component handling), Tape & Reel (TR) for automated assembly, and standard packaging. All provide identical electrical functionality. Select based on your assembly process requirements.

Q: Are all substitute parts RoHS3 compliant?

A: All recommended substitute parts listed carry RoHS3 compliance certification. The original CAT24C01YI-GT3 does not specify RoHS status due to its obsolete classification. All active Microchip Technology and onsemi alternatives meet current RoHS3 requirements.

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