Equivalent & Substitute Parts for 24AA025-I/ST

Part Overview

The 24AA025-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 in an 8-TSSOP surface mount package. This component is Active status and ROHS3 compliant. Substitute parts are identified when equivalent electrical and mechanical parameters are available, enabling design flexibility, supply chain optimization, and component availability management.

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 / Case	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts are classified into two categories based on electrical parameter compatibility:

MFR Recommended Substitutes — Parts with enhanced performance specifications (higher clock frequency, faster access time) that maintain full backward compatibility with the 24AA025-I/ST. These parts operate within the same voltage and temperature ranges and use identical packaging, enabling direct replacement with improved performance characteristics.

Parametric Equivalents — Parts with identical electrical specifications (400 kHz clock frequency, 900 ns access time) and matching mechanical packaging. These provide functional equivalence without performance enhancement.

Substitution eligibility is determined by:

Memory Size: 2Kbit (fixed requirement)
Memory Organization: 256 x 8 (fixed requirement)
Memory Interface: I2C (fixed requirement)
Package / Case: 8-TSSOP with 0.173" width, 4.40mm Width (fixed requirement)
Voltage Supply Range: Must encompass or match 1.7V ~ 5.5V
Operating Temperature: Must match -40°C ~ 85°C
Mounting Type: Surface Mount (fixed requirement)

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Package	Substitution Type
24AA025-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	8-TSSOP	Main Part
AT24CS02-XHM-T	Microchip Technology	2Kbit	1 MHz	550 ns	1.7V ~ 5.5V	8-TSSOP	MFR Recommended
AT24HC02C-XHM-B	Microchip Technology	2Kbit	1 MHz	550 ns	1.7V ~ 5.5V	8-TSSOP	MFR Recommended
24AA02-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	8-TSSOP	Parametric Equivalent
24AA024-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	8-TSSOP	Parametric Equivalent
BR24G02FVT-3AGE2	Rohm Semiconductor	2Kbit	1 MHz	Not Specified	1.6V ~ 5.5V	8-TSSOP-B	MFR Recommended
BR24G02FVT-3GE2	Rohm Semiconductor	2Kbit	400 kHz	Not Specified	1.6V ~ 5.5V	8-TSSOP-B	MFR Recommended
BR24L02FVT-WE2	Rohm Semiconductor	2Kbit	400 kHz	Not Specified	1.8V ~ 5.5V	8-TSSOP-B	MFR Recommended
BR24T02FVT-WGE2	ROHM Semiconductor	2Kbit	400 kHz	Not Specified	1.6V ~ 5.5V	8-TSSOP-B	MFR Recommended
BR34E02FVT-3E2	Rohm Semiconductor	2Kbit	400 kHz	Not Specified	1.7V ~ 5.5V	8-TSSOP-B	MFR Recommended
BR34L02FV-WE2	Rohm Semiconductor	2Kbit	400 kHz	Not Specified	1.7V ~ 5.5V	8-LSSOP	MFR Recommended

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, meeting regulatory requirements equivalent to the 24AA025-I/ST. Selection between MFR Recommended and Parametric Equivalent substitutes depends on application timing requirements and supply chain availability.

Microchip Technology AT24CS02-XHM-T and AT24HC02C-XHM-B offer enhanced clock frequency (1 MHz) and reduced access time (550 ns), providing performance margin for timing-critical applications while maintaining identical voltage and temperature specifications.

Parametric equivalents 24AA02-I/ST and 24AA024-I/ST provide direct functional replacement with identical electrical characteristics, suitable for applications where performance enhancement is not required.

Rohm Semiconductor BR-series parts (BR24G02FVT-3AGE2, BR24G02FVT-3GE2, BR24L02FVT-WE2, BR24T02FVT-WGE2, BR34E02FVT-3E2, BR34L02FV-WE2) offer alternative sourcing from a different manufacturer. BR34L02FV-WE2 uses 8-LSSOP packaging instead of 8-TSSOP, requiring PCB layout verification before implementation.

Frequently Asked Questions (FAQ)

Q: Can AT24CS02-XHM-T replace 24AA025-I/ST directly? A: Yes. AT24CS02-XHM-T is a MFR Recommended substitute with identical memory size, organization, I2C interface, voltage range, temperature range, and 8-TSSOP packaging. The higher clock frequency (1 MHz vs 400 kHz) and faster access time (550 ns vs 900 ns) provide backward compatibility with improved performance.

Q: What is the difference between MFR Recommended and Parametric Equivalent substitutes? A: MFR Recommended substitutes feature enhanced electrical specifications (higher clock frequency, faster access time) while maintaining full backward compatibility. Parametric Equivalents have identical electrical specifications to the 24AA025-I/ST. Both categories use compatible packaging and voltage/temperature ranges.

Q: Are Rohm Semiconductor BR-series parts compatible with 24AA025-I/ST? A: BR-series parts maintain 2Kbit memory size, 256 x 8 organization, I2C interface, and 8-TSSOP packaging compatibility. Voltage supply ranges vary slightly (1.6V minimum for most BR parts vs 1.7V for 24AA025-I/ST). BR34L02FV-WE2 uses 8-LSSOP packaging instead of standard 8-TSSOP, requiring PCB footprint verification.

Q: Does package designation 8-TSSOP-B differ from 8-TSSOP? A: Both designations refer to 8-pin thin shrink small outline packages with 0.173" width and 4.40mm width. The "-B" suffix indicates variant designation from Rohm Semiconductor. Physical dimensions and PCB footprints are compatible.

Q: Which substitute part offers the best performance improvement? A: AT24CS02-XHM-T and AT24HC02C-XHM-B both provide 1 MHz clock frequency and 550 ns access time, representing 2.5x frequency improvement and 39% access time reduction compared to the 24AA025-I/ST baseline.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance status, meeting regulatory requirements equivalent to the main part.

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