AT24HC02B-TH-B EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The AT24HC02B-TH-B is a 2Kbit I2C EEPROM memory IC manufactured by Microchip Technology, packaged in 8-TSSOP surface mount configuration. This part operates at 1 MHz clock frequency with 550 ns access time and supports supply voltages from 1.8V to 5.5V across the industrial temperature range of -40°C to 85°C. The product is currently obsolete, making equivalent substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain functional compatibility through matching memory capacity, I2C interface protocol, package type, and operating temperature range while accommodating variations in clock frequency and access time specifications.

Key Parameters

Parameter	AT24HC02B-TH-B
Memory Size	2Kbit
Memory Organization	256 x 8
Memory Interface	I2C
Clock Frequency	1 MHz
Access Time	550 ns
Write Cycle Time	5 ms
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
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following parameters:

Critical Matching Parameters (Non-Negotiable):

Memory Size: 2Kbit
Memory Organization: 256 x 8
Memory Interface: I2C protocol
Package / Case: 8-TSSOP (0.173", 4.40mm Width)
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Allowable Variation Parameters:

Clock Frequency: 400 kHz to 1 MHz (lower frequencies remain compatible with I2C protocol)
Access Time: 550 ns to 900 ns (slower access times do not prevent functional operation)
Voltage Supply Range: Minimum 1.7V to 1.8V; Maximum 5.5V (overlapping ranges acceptable)
Operating Temperature: -40°C to -20°C minimum; 85°C maximum (ranges must encompass or match the original specification)

All substitute parts listed maintain the core functional requirements of 2Kbit I2C EEPROM memory in 8-TSSOP surface mount packaging with full RoHS3 compliance and MSL-1 moisture sensitivity rating.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temperature	Package	Product Status
AT24HC02B-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
24VL024T/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 MSL-1 moisture sensitivity rating, ensuring regulatory and environmental compatibility with the original AT24HC02B-TH-B specification.

Primary Substitutes (Highest Compatibility): The 24AA02-I/ST, 24AA024-I/ST, 24AA025-I/ST, 24AA02H-I/ST, and 24AA52-I/ST variants are recommended as primary substitutes. These parts maintain the full industrial temperature range of -40°C to 85°C and supply voltage compatibility of 1.7V to 5.5V or 1.8V to 5.5V, matching or exceeding the original specification. All are currently in active product status with established supply availability.

Secondary Substitutes (Voltage-Limited): The 24VL024/ST, 24VL024H/ST, and 24VL024T/ST variants operate within a reduced voltage range of 1.5V to 3.6V and minimum operating temperature of -20°C. These parts are suitable only for applications where the design operates within these narrower electrical and thermal boundaries.

Packaging Considerations: The 24AA024H-I/ST, 24AA02-I/ST, 24AA024-I/ST, 24AA025-I/ST, 24AA02H-I/ST, 24AA52-I/ST, 24VL024/ST, and 24VL024H/ST are supplied in Tube packaging. The 24AA52T-I/ST and 24VL024T/ST are supplied in Tape & Reel (TR) format, suitable for automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can I use a 400 kHz I2C EEPROM to replace the 1 MHz AT24HC02B-TH-B?

A: Yes. The I2C protocol supports clock frequencies from 100 kHz to 1 MHz in standard operation. A 400 kHz substitute part operates at a lower clock speed but maintains full functional compatibility. The system I2C bus will operate at the speed of the slowest device present. No design modification is required.

Q: What is the difference between 24AA02, 24AA024, 24AA025, and 24AA52 variants?

A: All variants maintain identical 2Kbit memory capacity, 256 x 8 organization, I2C interface, and 8-TSSOP packaging. Differences exist in internal addressing schemes and device addressing pins, but all are functionally equivalent 2Kbit I2C EEPROMs. Selection depends on specific address assignment requirements in your application.

Q: Why do 24VL024 parts have a narrower voltage range?

A: The 24VL024 series is optimized for low-voltage applications (1.5V to 3.6V) and operates at a reduced minimum temperature of -20°C. These parts are suitable only for designs that do not require the full -40°C to 85°C industrial temperature range or the extended 1.8V to 5.5V supply voltage range of the original part.

Q: Does the 900 ns access time of substitute parts affect system performance?

A: The 900 ns access time of substitute parts is slower than the original 550 ns specification. However, I2C EEPROM access timing is determined by the I2C clock frequency and protocol timing, not by the device access time specification. At 400 kHz I2C operation, the protocol timing dominates, and the 900 ns device access time does not create a functional limitation.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification and MSL-1 moisture sensitivity rating, matching the environmental and regulatory status of the original AT24HC02B-TH-B.

Q: What packaging format should I select for production?

A: Tube packaging (standard -I/ST and -H/ST variants) is suitable for manual assembly and small-volume production. Tape & Reel (TR) format (24AA52T-I/ST and 24VL024T/ST) is optimized for automated pick-and-place assembly in high-volume manufacturing. Both formats contain identical die and electrical specifications.

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