CAT24C01YI-G Equivalent & Substitute Parts

Part Overview

The CAT24C01YI-G is a 1Kbit EEPROM memory IC manufactured by onsemi, featuring I2C interface with 400 kHz clock frequency and 900 ns access time. The device is packaged in 8-TSSOP surface mount configuration and operates across a supply voltage range of 1.7V to 5.5V with temperature range of -40°C to 85°C. This part is currently obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

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	5ms
Supply Voltage	1.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution for the CAT24C01YI-G is determined by strict alignment of the following critical parameters:

Memory capacity: 1Kbit (128 x 8 organization)
Interface protocol: I2C
Clock frequency: 400 kHz minimum
Access time: 900 ns or faster
Package: 8-TSSOP surface mount
Supply voltage range: Must encompass 1.7V ~ 5.5V or be compatible within application requirements
Write cycle time: 5ms

Substitute parts are grouped into two categories: direct equivalents with matching access time (900 ns) and compatible alternatives with faster access times (400 ns or 3500 ns) that maintain functional compatibility.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Supply Voltage	Operating Temperature	Package	Product Status
CAT24C01YI-G	onsemi	1Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Obsolete
BR24T01FVT-WE2	Rohm Semiconductor	1Kbit	400 kHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
24AA01-I/ST	Microchip Technology	1Kbit	400 kHz	3500 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA01HT-I/ST	Microchip Technology	1Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA01T-I/ST	Microchip Technology	1Kbit	400 kHz	3500 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24LC014HT-E/ST	Microchip Technology	1Kbit	1 MHz	400 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
24LC01B-E/ST	Microchip Technology	1Kbit	400 kHz	4.6 µs	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
24LC01B-I/ST	Microchip Technology	1Kbit	400 kHz	4.6 µs	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24LC01B/ST	Microchip Technology	1Kbit	400 kHz	4.6 µs	2.5V ~ 5.5V	0°C ~ 70°C	8-TSSOP	Active
24LC01BH-E/ST	Microchip Technology	1Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
24LC01BH-I/ST	Microchip Technology	1Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active

Engineering Selection Recommendations

Direct Equivalents (900 ns Access Time, 400 kHz I2C):

24AA01HT-I/ST and 24LC01BH-I/ST are functionally equivalent to CAT24C01YI-G with matching access time and clock frequency. Both are manufactured by Microchip Technology with active product status and RoHS3 compliance. 24AA01HT-I/ST maintains the original supply voltage range of 1.7V ~ 5.5V. 24LC01BH-I/ST operates at 2.5V ~ 5.5V with extended temperature range to -40°C ~ 125°C.

Compatible Alternatives (Faster Access Time):

24LC014HT-E/ST offers superior performance with 1 MHz clock frequency and 400 ns access time. This part requires minimum 2.5V supply and supports extended temperature range to 125°C. Faster access time provides performance margin for timing-critical applications.

Compatible Alternatives (Slower Access Time):

24AA01-I/ST, 24AA01T-I/ST, 24LC01B-E/ST, 24LC01B-I/ST, and 24LC01B/ST are compatible with 3500 ns or 4.6 µs access times. These parts maintain I2C 400 kHz interface and 1Kbit capacity. Selection depends on application timing requirements and temperature range specifications. 24LC01B/ST operates at reduced temperature range of 0°C ~ 70°C.

Rohm Semiconductor Alternative:

BR24T01FVT-WE2 provides substitution from alternative manufacturer with active product status and RoHS3 compliance. Supply voltage range of 1.6V ~ 5.5V is compatible with original specification.

All substitute parts maintain 8-TSSOP package compatibility, 5ms write cycle time, and non-volatile EEPROM technology.

Frequently Asked Questions (FAQ)

Q: Can 24AA01HT-I/ST directly replace CAT24C01YI-G?

A: Yes. Both parts share identical memory capacity (1Kbit), interface (I2C 400 kHz), access time (900 ns), supply voltage range (1.7V ~ 5.5V), and operating temperature range (-40°C ~ 85°C). Package is 8-TSSOP in both cases. 24AA01HT-I/ST is active product status with RoHS3 compliance.

Q: What is the difference between 24AA01HT-I/ST and 24LC01BH-I/ST?

A: Both provide 900 ns access time and 400 kHz I2C interface. 24AA01HT-I/ST operates at 1.7V ~ 5.5V with -40°C ~ 85°C temperature range. 24LC01BH-I/ST operates at 2.5V ~ 5.5V with extended temperature range to -40°C ~ 125°C. Selection depends on minimum supply voltage and temperature requirements of the application.

Q: Can I use 24LC014HT-E/ST as a substitute?

A: Yes, with application verification. 24LC014HT-E/ST is functionally compatible with faster performance: 1 MHz clock frequency and 400 ns access time. However, minimum supply voltage is 2.5V (versus 1.7V for CAT24C01YI-G). Verify that application supply voltage meets 2.5V minimum requirement.

Q: Why do some substitutes have different access times?

A: Access time specification indicates how quickly the device responds to read requests. Faster access times (400 ns) provide performance margin. Slower access times (3500 ns or 4.6 µs) are still compatible with 400 kHz I2C protocol. Application timing requirements determine acceptable access time range.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts are RoHS3 compliant. Original CAT24C01YI-G is obsolete and REACH unaffected. All active substitutes maintain REACH unaffected status and EAR99 export classification.

Q: What is the significance of the 8-TSSOP-B package designation?

A: BR24T01FVT-WE2 uses 8-TSSOP-B package variant. This is mechanically and electrically compatible with standard 8-TSSOP (0.173", 4.40mm width). The "-B" designation indicates minor package refinement while maintaining footprint compatibility.

Q: Can I substitute parts with different temperature ranges?

A: Yes, if application operating temperature falls within the substitute part's range. CAT24C01YI-G operates -40°C ~ 85°C. Substitutes with extended range (-40°C ~ 125°C) are suitable for all original applications. Substitutes with reduced range (0°C ~ 70°C) are suitable only for applications within that narrower range.

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