Equivalent & Substitute Parts for 24AA02T/ST

Part Overview

The 24AA02T/ST is a 2Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface with 400 kHz clock frequency and 900 ns access time in an 8-TSSOP surface mount package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and production continuity. Substitute parts must maintain electrical compatibility across memory capacity, interface protocol, voltage supply range, and package specifications while meeting current product status requirements.

Key Parameters

Parameter	Value
Memory Size	2Kbit
Memory Organization	256 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	0°C ~ 70°C
Package / Case	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution logic for the 24AA02T/ST is based on the following critical parameters:

Primary Compatibility Criteria:

Memory Size: 2Kbit (256 x 8 organization)
Memory Interface: I2C protocol
Package: 8-TSSOP form factor
Voltage Supply: 1.7V ~ 5.5V range
Write Cycle Time: 5ms maximum

Secondary Compatibility Criteria:

Clock Frequency: 400 kHz or higher (backward compatible)
Access Time: 900 ns or faster (backward compatible)
Operating Temperature: Extended range (-40°C ~ 85°C or -40°C ~ 125°C) provides broader application scope
Product Status: Active status ensures ongoing availability and support

Substitute parts are grouped into two categories: direct Microchip Technology equivalents with identical electrical specifications, and functionally compatible alternatives from the same manufacturer with enhanced performance characteristics (higher clock frequency, faster access time, or extended temperature range).

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temperature	Package	Product Status
24AA02T/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	0°C ~ 70°C	8-TSSOP	Obsolete
24AA02/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	0°C ~ 70°C	8-TSSOP	Active
24AA024HT-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA024T-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA025T-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA02HT-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA02T-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
34AA02T-E/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
34AA02T-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
AT24CS02-XHM-T	Microchip Technology	2Kbit	1 MHz	550 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
AT24HC02C-XHM-T	Microchip Technology	2Kbit	1 MHz	550 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active

Engineering Selection Recommendations

Direct Replacement (Identical Electrical Specifications): 24AA02/ST, 24AA024HT-I/ST, 24AA024T-I/ST, 24AA025T-I/ST, 24AA02HT-I/ST, and 24AA02T-I/ST are functionally equivalent to the 24AA02T/ST. All maintain 2Kbit capacity, 400 kHz I2C clock frequency, 900 ns access time, and 1.7V ~ 5.5V supply voltage. These parts are active products with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). Selection among these variants depends on packaging requirements (Tape & Reel vs. Cut Tape) and operating temperature range needs.

Extended Temperature Range Alternatives: 34AA02T-E/ST and 34AA02T-I/ST extend operating temperature to -40°C ~ 125°C and -40°C ~ 85°C respectively, maintaining all other electrical parameters. These are suitable for applications requiring broader thermal operating conditions while preserving I2C interface compatibility and 2Kbit memory capacity.

Enhanced Performance Alternatives: AT24CS02-XHM-T and AT24HC02C-XHM-T provide improved performance with 1 MHz clock frequency and 550 ns access time, representing a 2.5x speed improvement over the original specification. These parts maintain 2Kbit capacity, 1.7V ~ 5.5V supply voltage, and 8-TSSOP packaging. Enhanced performance is backward compatible with systems designed for 400 kHz operation.

Product Status Consideration: All recommended substitutes carry Active product status, ensuring continued manufacturing support, availability, and technical documentation. The original 24AA02T/ST is classified as Obsolete; transition to an active equivalent is necessary for long-term supply chain reliability.

Frequently Asked Questions (FAQ)

Q: Can 24AA02/ST directly replace 24AA02T/ST in existing designs? A: Yes. Both parts share identical electrical specifications: 2Kbit capacity, 400 kHz I2C interface, 900 ns access time, and 1.7V ~ 5.5V supply voltage. The primary difference is product status (Active vs. Obsolete) and packaging format. Verify packaging requirements (Tape & Reel vs. Cut Tape) before substitution.

Q: What is the difference between 24AA02T-I/ST and 24AA02HT-I/ST? A: Both parts are electrically identical with 2Kbit capacity, 400 kHz clock frequency, and 900 ns access time. The "HT" designation indicates a higher temperature variant with -40°C ~ 85°C operating range compared to the standard 0°C ~ 70°C range. Select based on application temperature requirements.

Q: Are AT24CS02-XHM-T and AT24HC02C-XHM-T compatible with 24AA02T/ST? A: Yes, with performance enhancement. Both parts maintain 2Kbit capacity, I2C interface, 1.7V ~ 5.5V supply voltage, and 8-TSSOP packaging. The key difference is improved speed: 1 MHz clock frequency and 550 ns access time versus the original 400 kHz and 900 ns. This represents a 2.5x performance improvement and is backward compatible with existing I2C bus designs.

Q: Can I use 34AA02T-E/ST in place of 24AA02T/ST? A: Yes. Both parts maintain 2Kbit capacity, 400 kHz I2C clock frequency, 900 ns access time, and 1.7V ~ 5.5V supply voltage in 8-TSSOP packaging. The 34AA02T-E/ST extends operating temperature to -40°C ~ 125°C, making it suitable for high-temperature applications while maintaining full electrical compatibility.

Q: What packaging options are available for substitutes? A: Substitute parts are available in Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® formats. Verify packaging requirements for your assembly process. All parts maintain identical 8-TSSOP (0.173", 4.40mm Width) physical form factor.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All recommended substitute parts carry ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity level, meeting current environmental and reliability standards.

Q: Which substitute offers the best performance improvement? A: AT24CS02-XHM-T and AT24HC02C-XHM-T provide the highest performance with 1 MHz clock frequency and 550 ns access time. These are suitable for applications requiring faster I2C communication while maintaining full backward compatibility with 400 kHz bus designs.

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