CAT24C01WI-G EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The CAT24C01WI-G is a 1Kbit EEPROM memory IC manufactured by onsemi, featuring I2C interface operation at 400 kHz with 8-SOIC surface mount packaging. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part operates across a wide voltage range of 1.7V to 5.5V and supports industrial temperature specifications 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-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the CAT24C01WI-G is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

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-SOIC (exact match required)
Voltage Supply Range: Must encompass or match 1.7V ~ 5.5V
Operating Temperature: Must support -40°C ~ 85°C minimum

Secondary Compatibility Factors:

Access Time: 900 ns (CAT24C01WI-G specification; substitutes with equal or faster access time are compatible)
Write Cycle Time: 5ms (all qualified substitutes match this specification)
Mounting Type: Surface Mount (all qualified substitutes use surface mount)

Parts meeting all primary criteria are direct functional equivalents. Parts with improved specifications (faster access time, higher clock frequency capability, or extended temperature range) remain compatible when the core memory parameters and interface match.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Memory Organization	Clock Frequency	Access Time	Voltage Supply	Operating Temperature	Package	Product Status
CAT24C01WI-G	onsemi	1Kbit	128 x 8	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Obsolete
24AA01-I/SN	Microchip Technology	1Kbit	128 x 8	400 kHz	3500 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
24AA01/SN	Microchip Technology	1Kbit	128 x 8	400 kHz	3500 ns	1.7V ~ 5.5V	0°C ~ 70°C	8-SOIC	Active
24AA014HT-I/SN	Microchip Technology	1Kbit	128 x 8	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
24AA014T-I/SN	Microchip Technology	1Kbit	128 x 8	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
24AA01HT-I/SN	Microchip Technology	1Kbit	128 x 8	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
24AA01T-I/SN	Microchip Technology	1Kbit	128 x 8	400 kHz	3500 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
24LC014-E/SN	Microchip Technology	1Kbit	128 x 8	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Active
24LC014-I/SN	Microchip Technology	1Kbit	128 x 8	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active
24LC014H-I/SN	Microchip Technology	1Kbit	128 x 8	1 MHz	400 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active

Engineering Selection Recommendations

Direct Functional Equivalents (Recommended Primary Substitutes):

The following parts provide exact functional equivalence to the CAT24C01WI-G across all critical parameters:

24AA014HT-I/SN and 24AA014T-I/SN: Both manufactured by Microchip Technology with identical 1Kbit capacity, 128 x 8 organization, 400 kHz I2C operation, 900 ns access time, and -40°C to 85°C temperature range. Both are Active status products with RoHS3 compliance. The primary difference is packaging format (Tape & Reel).
24AA01HT-I/SN: Microchip Technology equivalent with matching core specifications and Active product status. RoHS3 compliant.

Compatible Substitutes with Extended Specifications:

24LC014-I/SN: Microchip Technology part with identical memory and interface specifications. Voltage supply range is 2.5V to 5.5V (narrower than original 1.7V to 5.5V). Operating temperature matches -40°C to 85°C. Active status with RoHS3 compliance. Suitable for applications where minimum supply voltage of 2.5V is acceptable.
24LC014-E/SN: Identical to 24LC014-I/SN with extended operating temperature to -40°C to 125°C. Voltage supply range 2.5V to 5.5V. Active status with RoHS3 compliance. Recommended for high-temperature applications.
24LC014H-I/SN: Microchip Technology part with enhanced clock frequency (1 MHz vs. 400 kHz) and faster access time (400 ns vs. 900 ns). Voltage supply 2.5V to 5.5V. Backward compatible for 400 kHz operation. Active status with RoHS3 compliance.

Secondary Substitutes (Functional Compatibility with Access Time Variance):

24AA01-I/SN and 24AA01T-I/SN: Microchip Technology parts with 3500 ns access time (slower than CAT24C01WI-G 900 ns specification). All other parameters match. Active status with RoHS3 compliance. Suitable for applications where access time is not timing-critical.
24AA01/SN: Microchip Technology part with 3500 ns access time and reduced operating temperature range (0°C to 70°C). Not recommended for full industrial temperature range applications.

Non-Recommended Substitutes:

N24C02UDTG: onsemi part with 2Kbit memory capacity and 128 x 16 organization. Does not meet primary substitution criteria due to different memory size and organization.

All recommended substitutes maintain RoHS3 compliance and REACH unaffected status consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can I use 24AA01-I/SN as a direct replacement for CAT24C01WI-G?

A: Yes, 24AA01-I/SN is functionally compatible. Both parts share identical 1Kbit capacity, 128 x 8 organization, 400 kHz I2C interface, 8-SOIC packaging, and -40°C to 85°C operating temperature. The primary difference is access time: 24AA01-I/SN specifies 3500 ns versus CAT24C01WI-G's 900 ns. This substitution is valid for applications where access time is not timing-critical.

Q: What is the difference between 24AA014HT-I/SN and 24AA014T-I/SN?

A: Both parts are electrically identical with 1Kbit capacity, 400 kHz I2C operation, 900 ns access time, and -40°C to 85°C temperature range. The difference is packaging format: 24AA014HT-I/SN is supplied in Tape & Reel (TR) format, while 24AA014T-I/SN is also Tape & Reel. Both are suitable direct replacements for CAT24C01WI-G.

Q: Why does 24LC014-I/SN have a narrower voltage range (2.5V to 5.5V) compared to CAT24C01WI-G (1.7V to 5.5V)?

A: The 24LC014-I/SN is specified for a minimum supply voltage of 2.5V due to its internal design. If your application requires operation below 2.5V, this part is not suitable. For applications operating at 2.5V or higher, 24LC014-I/SN is fully compatible across all other parameters.

Q: Is 24LC014H-I/SN backward compatible with CAT24C01WI-G?

A: Yes. 24LC014H-I/SN operates at 1 MHz clock frequency with 400 ns access time, both faster than the CAT24C01WI-G's 400 kHz and 900 ns specifications. The part is backward compatible and will operate correctly in circuits designed for 400 kHz I2C operation. The faster specifications provide performance headroom without compromising compatibility.

Q: Can I use N24C02UDTG as a substitute?

A: No. N24C02UDTG has 2Kbit memory capacity with 128 x 16 organization, which differs from the CAT24C01WI-G's 1Kbit capacity and 128 x 8 organization. This part does not meet the primary substitution criteria and is not functionally equivalent.

Q: What does "Active" product status mean compared to "Obsolete"?

A: Active status indicates the part is currently manufactured and available from the supplier with ongoing production support. Obsolete status indicates the part is no longer manufactured. All recommended substitutes have Active status, ensuring long-term availability and supply chain continuity.

Q: Are all recommended substitutes RoHS3 compliant?

A: Yes. All recommended substitute parts carry RoHS3 compliance certification, matching the environmental compliance profile of the original CAT24C01WI-G. All parts are also REACH unaffected.

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