AT24C02B-TH-B Equivalent & Substitute Parts

Part Overview

The AT24C02B-TH-B is a 2Kbit EEPROM memory IC with I2C interface manufactured by Microchip Technology. This device operates at 1 MHz clock frequency with 550 ns access time and supports a supply voltage range of 1.8V to 5.5V across an operating temperature range of -40°C to 85°C. The component is packaged in 8-TSSOP form factor and is currently classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Memory Size	2Kbit
Memory Organization	256 x 8
Memory Interface	I2C
Clock Frequency	1 MHz
Access Time	550 ns
Write Cycle Time	5ms
Voltage Supply Range	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the AT24C02B-TH-B is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Parameters:

Memory Size: 2Kbit (256 x 8 organization)
Memory Interface: I2C protocol
Package / Case: 8-TSSOP form factor
Mounting Type: Surface Mount
Write Cycle Time: 5ms
RoHS Compliance: ROHS3 Compliant

Acceptable Parameter Variations:

Clock Frequency: The main part operates at 1 MHz. Substitute parts operating at 400 kHz are functionally compatible, as I2C protocol supports multiple clock speeds and lower frequencies remain backward compatible.
Access Time: The main part specifies 550 ns. Substitute parts with 900 ns access time are acceptable, as this represents a slower but compatible specification.
Voltage Supply Range: Substitute parts with ranges of 1.7V ~ 5.5V or 1.5V ~ 3.6V are acceptable provided the operating voltage of the application falls within the substitute part's range.
Operating Temperature: Substitute parts with -20°C ~ 85°C range are acceptable for applications not requiring the full -40°C lower limit.
Product Status: Active status parts are preferred over obsolete parts for new designs and production continuity.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temperature	Package	Product Status
AT24C02B-TH-B	Microchip Technology	2Kbit	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Obsolete
24AA024H-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA52T-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA02-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA024-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA025-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA02H-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA52-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24VL024/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.5V ~ 3.6V	-20°C ~ 85°C	8-TSSOP	Active
24VL024H/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.5V ~ 3.6V	-20°C ~ 85°C	8-TSSOP	Active
24VL024HT/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.5V ~ 3.6V	-20°C ~ 85°C	8-TSSOP	Active

Engineering Selection Recommendations

All listed substitute parts are manufactured by Microchip Technology and maintain ROHS3 compliance with unlimited moisture sensitivity level (MSL 1). The following selection criteria apply:

For applications requiring full -40°C lower temperature limit: Select from 24AA024H-I/ST, 24AA52T-I/ST, 24AA02-I/ST, 24AA024-I/ST, 24AA025-I/ST, 24AA02H-I/ST, or 24AA52-I/ST. These parts maintain the -40°C to 85°C operating temperature range of the original AT24C02B-TH-B.

For applications with reduced temperature requirements (-20°C minimum): The 24VL024/ST, 24VL024H/ST, and 24VL024HT/ST series are suitable. These parts operate within 1.5V to 3.6V supply range, making them appropriate for low-voltage applications.

For applications requiring 1.8V minimum supply voltage: Select 24AA52T-I/ST or 24AA52-I/ST, which specify 1.8V ~ 5.5V supply range matching the original part's lower voltage limit.

For standard applications with 1.7V or higher supply voltage: 24AA024H-I/ST, 24AA02-I/ST, 24AA024-I/ST, 24AA025-I/ST, and 24AA02H-I/ST are all suitable alternatives with active product status.

All substitute parts are available in active production status, ensuring long-term supply continuity and support.

Frequently Asked Questions (FAQ)

Q: Can I use a 400 kHz I2C EEPROM to replace the 1 MHz AT24C02B-TH-B?

A: Yes. The I2C protocol supports multiple clock frequencies. A 400 kHz device is backward compatible with systems designed for 1 MHz operation, as the lower frequency remains within the I2C specification. The system will operate at the lower clock speed without functional issues.

Q: What is the difference between the 24AA series and 24VL series?

A: The primary difference is the supply voltage range. The 24AA series operates at 1.7V ~ 5.5V (or 1.8V ~ 5.5V for specific variants), while the 24VL series operates at 1.5V ~ 3.6V. The 24VL series is optimized for low-voltage applications. Both series maintain identical memory capacity, I2C interface, and 8-TSSOP packaging.

Q: Are all substitute parts available in the same packaging?

A: Yes. All listed substitute parts use the 8-TSSOP (0.173", 4.40mm Width) surface mount package, maintaining mechanical compatibility with the original AT24C02B-TH-B footprint.

Q: What does the temperature range difference mean for my application?

A: The AT24C02B-TH-B and most substitute parts (24AA series) operate from -40°C to 85°C. The 24VL series operates from -20°C to 85°C. If your application requires operation below -20°C, select from the 24AA series. For applications with minimum operating temperature of -20°C or higher, the 24VL series is acceptable.

Q: Is there a difference in access time between the main part and substitutes?

A: Yes. The AT24C02B-TH-B specifies 550 ns access time, while most substitute parts specify 900 ns. This represents a slower access time but remains functionally compatible for I2C EEPROM applications, as I2C protocol timing is not critically dependent on this parameter.

Q: Are all parts RoHS compliant?

A: Yes. The AT24C02B-TH-B and all listed substitute parts are ROHS3 compliant, meeting environmental and regulatory requirements for electronic components.

Q: What packaging options are available for these parts?

A: Substitute parts are available in Tube packaging (standard for most variants) and Tape & Reel (TR) packaging (24VL024HT/ST). Select based on your procurement and assembly requirements.

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