CAT24C01ZI-G Equivalent & Substitute Parts

Part Overview

The CAT24C01ZI-G is a 1Kbit EEPROM memory IC manufactured by onsemi, featuring I2C interface operation at 400 kHz with 900 ns access time in an 8-MSOP surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The device operates across a supply voltage range of 1.7V to 5.5V and temperature range of -40°C to 85°C, serving applications requiring non-volatile serial memory storage.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile EEPROM
Memory Size	1Kbit
Memory Organization	128 x 8
Interface	I2C
Clock Frequency	400 kHz
Access Time	900 ns
Write Cycle Time	5 ms
Supply Voltage	1.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package	8-MSOP (0.118", 3.00mm Width)

Substitute Part Grouping Explanation

Substitution for the CAT24C01ZI-G is determined by strict alignment of the following electrical and mechanical parameters:

Memory capacity: 1Kbit with 128 x 8 organization
Interface protocol: I2C at 400 kHz
Access time: 900 ns (critical for timing-sensitive applications)
Supply voltage range: Must support 1.7V minimum
Operating temperature: Minimum -40°C to 85°C
Package: 8-MSOP surface mount form factor
Mounting type: Surface mount

Substitute parts are grouped into two categories based on access time specification: parts with 900 ns access time provide direct functional equivalence, while parts with 3500 ns or 4.6 µs access time represent slower alternatives suitable only where timing constraints permit.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Access Time	Supply Voltage	Temp Range	Package	Product Status	RoHS Status
CAT24C01ZI-G	onsemi	1Kbit	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-MSOP	Obsolete	Not Specified
24AA01HT-I/MS	Microchip Technology	1Kbit	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-MSOP	Active	ROHS3 Compliant
24LC014-I/MS	Microchip Technology	1Kbit	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-MSOP	Active	ROHS3 Compliant
24LC014T-E/MS	Microchip Technology	1Kbit	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-MSOP	Active	ROHS3 Compliant
24LC01BH-E/MS	Microchip Technology	1Kbit	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-MSOP	Active	ROHS3 Compliant
24LC01BH-I/MS	Microchip Technology	1Kbit	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-MSOP	Active	ROHS3 Compliant
24LC01BHT-I/MS	Microchip Technology	1Kbit	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-MSOP	Active	ROHS3 Compliant
24AA01-I/MS	Microchip Technology	1Kbit	3500 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-MSOP	Active	ROHS3 Compliant
24AA01HT-I/MS	Microchip Technology	1Kbit	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-MSOP	Active	ROHS3 Compliant
24AA01T-I/MS	Microchip Technology	1Kbit	3500 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-MSOP	Active	ROHS3 Compliant
24LC01B-E/MS	Microchip Technology	1Kbit	4.6 µs	2.5V ~ 5.5V	-40°C ~ 125°C	8-MSOP	Active	ROHS3 Compliant
24LC01B-I/MS	Microchip Technology	1Kbit	4.6 µs	2.5V ~ 5.5V	-40°C ~ 85°C	8-MSOP	Active	ROHS3 Compliant

Engineering Selection Recommendations

For direct replacement of the CAT24C01ZI-G, select from parts with 900 ns access time and matching supply voltage range of 1.7V to 5.5V. The 24AA01HT-I/MS and 24AA01-I/MS from Microchip Technology provide the closest electrical equivalence while maintaining active product status and ROHS3 compliance.

Parts with 2.5V minimum supply voltage (24LC014 series and 24LC01BH series) are suitable only for applications where the 1.7V lower limit is not required. The 24LC014T-E/MS and 24LC01BH-E/MS extend the operating temperature range to 125°C, providing enhanced thermal performance for high-temperature environments.

Slower access time variants (3500 ns or 4.6 µs) are acceptable only where system timing permits the extended read latency. All recommended substitutes carry ROHS3 compliance certification, supporting environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can I use a part with 3500 ns access time instead of 900 ns?

A: Only if your application timing does not depend on the faster 900 ns access time. The 3500 ns variants introduce approximately 2.6 µs additional latency per read operation. Verify system-level timing requirements before substitution.

Q: What is the difference between 24AA01 and 24LC01 series?

A: The 24AA01 series supports supply voltage down to 1.7V, while 24LC01 series requires minimum 2.5V. Select 24AA01 for low-voltage applications; use 24LC01 only where 2.5V minimum is acceptable.

Q: Are all substitute parts pin-compatible with CAT24C01ZI-G?

A: All listed substitutes use the 8-MSOP package with identical pinout and mechanical dimensions (0.118", 3.00mm width). Pin-level compatibility is maintained across all alternatives.

Q: What packaging options are available for these substitutes?

A: Microchip Technology supplies these parts in Tube, Tape & Reel (TR), or standard packaging. Verify packaging availability with your supplier, as some variants may have limited stock in specific packaging formats.

Q: Do all substitutes meet the same compliance standards?

A: All active Microchip substitutes carry ROHS3 compliance and REACH Unaffected status. The obsolete CAT24C01ZI-G does not specify RoHS status. Confirm compliance requirements for your application before final selection.

Q: Can I mix different substitute parts in the same production run?

A: Yes, provided all selected parts meet your electrical and timing specifications. However, maintaining a single part number per design revision simplifies supply chain management and qualification testing.

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