Equivalent & Substitute Parts for 24AA02HT-I/ST

Part Overview

The 24AA02HT-I/ST is a 2Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface with 400 kHz clock frequency and 900 ns access time. This non-volatile memory device operates across a wide supply voltage range of 1.7V to 5.5V and is rated for -40°C to 85°C operating temperature. The part is ROHS3 compliant and carries Active product status. Equivalent and substitute parts are identified based on matching memory capacity, interface protocol, package type, and electrical operating parameters to ensure functional compatibility in system designs.

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	-40°C ~ 85°C
Package Type	8-TSSOP
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts are classified into three categories based on electrical and mechanical compatibility with the 24AA02HT-I/ST:

MFR Recommended Substitutes maintain identical memory specifications (2Kbit, 256 x 8 organization, I2C interface) with variations in clock frequency (1 MHz vs 400 kHz) and access time performance. These parts are sourced from Microchip Technology and feature Active product status with full compliance certifications. Operating temperature ranges extend to 125°C for select models, providing enhanced thermal performance.

Parametric Equivalents from Microchip Technology match all core electrical parameters including 400 kHz clock frequency, 900 ns access time, and identical voltage supply range. These parts are verified for DiGi-Electronics programmability and maintain the same 8-TSSOP package configuration.

Direct Manufacturer Alternatives from STMicroelectronics and Rohm Semiconductor provide functionally equivalent 2Kbit I2C EEPROM solutions with matching memory organization, interface protocol, and package type. These parts operate within compatible voltage and temperature ranges, with some offering enhanced clock frequency performance at 1 MHz.

Substitution is valid when the following parameters remain constant or compatible: Memory Size (2Kbit), Memory Organization (256 x 8), Memory Interface (I2C), Package Type (8-TSSOP), Mounting Type (Surface Mount), and Voltage Supply Range (minimum 1.7V, maximum 5.5V).

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temperature	Package	Product Status
24AA02HT-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
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
AT34C02D-XHM-T	Microchip Technology	2Kbit	1 MHz	Not Specified	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
24AA02T-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
M34E02-FDW6TP	STMicroelectronics	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
BR24G02FVT-3AGE2	Rohm Semiconductor	2Kbit	1 MHz	Not Specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
BR24G02FVT-3GE2	Rohm Semiconductor	2Kbit	400 kHz	Not Specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
M24C02-DRDW3TP/K	STMicroelectronics	2Kbit	1 MHz	450 ns	1.8V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, ensuring regulatory alignment with the original 24AA02HT-I/ST specification. Selection between substitutes depends on specific system requirements:

For applications requiring identical electrical performance at 400 kHz clock frequency with 900 ns access time, the 24AA02T-I/ST, 24AA024T-I/ST, and M34E02-FDW6TP provide direct functional equivalence. The M34E02-FDW6TP from STMicroelectronics offers the highest inventory availability at 41,228 units.

For systems tolerating enhanced performance at 1 MHz clock frequency with reduced access time (550 ns), the AT24CS02-XHM-T and AT24HC02C-XHM-T from Microchip Technology provide improved speed margins. The AT24CS02-XHM-T carries the highest inventory level at 15,684 units among high-speed options.

For applications requiring extended operating temperature range to 125°C, the 34AA02T-E/ST and M24C02-DRDW3TP/K are qualified options. The M24C02-DRDW3TP/K carries AEC-Q100 automotive qualification and is suitable for automotive-grade applications.

For designs using Rohm Semiconductor components, BR24G02FVT-3GE2 matches the 400 kHz clock frequency specification, while BR24G02FVT-3AGE2 provides 1 MHz performance with minimum supply voltage of 1.6V.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 24AA02HT-I/ST with a part operating at 1 MHz instead of 400 kHz?

A: Yes. Parts such as AT24CS02-XHM-T, AT24HC02C-XHM-T, and AT34C02D-XHM-T operate at 1 MHz and maintain all other critical parameters including 2Kbit memory size, 256 x 8 organization, I2C interface, 8-TSSOP package, and 1.7V to 5.5V supply voltage range. Higher clock frequency provides improved performance without compromising compatibility.

Q: What is the minimum supply voltage compatibility for substitute parts?

A: The 24AA02HT-I/ST specifies 1.7V minimum supply voltage. Most substitute parts from Microchip Technology and STMicroelectronics maintain this 1.7V minimum. Rohm Semiconductor parts (BR24G02 series) specify 1.6V minimum, which is compatible with 1.7V system designs. The M24C02-DRDW3TP/K specifies 1.8V minimum and is suitable for systems operating at 1.8V or higher.

Q: Are all substitute parts available in the same 8-TSSOP package?

A: Yes. All listed substitute parts use the 8-TSSOP (0.173", 4.40mm Width) package configuration, ensuring mechanical and electrical pin compatibility. Packaging variations exist between Tape & Reel (TR) and Cut Tape (CT) formats, but these are supply chain options that do not affect component functionality.

Q: Which substitute offers the best inventory availability?

A: The M34E02-FDW6TP from STMicroelectronics provides the highest inventory level at 41,228 units. For Microchip Technology parts, AT24CS02-XHM-T offers 15,684 units. Both parts are Active status with full compliance certifications.

Q: Can I use a substitute part with extended temperature range (-40°C to 125°C) in a design specified for -40°C to 85°C?

A: Yes. Parts with extended temperature range such as 34AA02T-E/ST and M24C02-DRDW3TP/K are backward compatible with designs requiring only -40°C to 85°C operation. Extended temperature capability provides additional design margin without introducing incompatibility.

Q: What is the difference between parametric equivalents and MFR recommended substitutes?

A: Parametric equivalents match all electrical specifications of the original part, including clock frequency and access time. MFR recommended substitutes may offer variations in clock frequency or temperature range while maintaining core memory specifications. Both categories ensure functional compatibility in I2C EEPROM applications.

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