Equivalent & Substitute Parts for 24LC025T/ST

Part Overview

The 24LC025T/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, which necessitates identification of active equivalent and substitute components for new designs and production continuity. Substitute parts must maintain electrical compatibility across memory capacity, interface protocol, and operating voltage ranges while accommodating packaging and temperature specification variations.

Key Parameters

Parameter	24LC025T/ST
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	2.5V ~ 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 eligibility is determined by the following mandatory parameters:

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

Substitute parts are grouped into two categories based on electrical operating ranges:

Category A - Standard Voltage Range (2.5V ~ 5.5V): Parts maintaining the original supply voltage specification of the 24LC025T/ST, suitable for direct replacement in existing designs without circuit modification.

Category B - Extended Voltage Range (1.7V ~ 5.5V or 1.8V ~ 5.5V): Parts with lower minimum supply voltage, offering broader operational flexibility. These are electrically compatible as they encompass the original voltage range.

Category C - Extended Temperature Range (-40°C ~ 85°C or -40°C ~ 125°C): Parts with expanded operating temperature specifications beyond the original 0°C ~ 70°C range, applicable for applications requiring wider thermal operation.

Clock frequency and access time variations (400 kHz / 900 ns versus 1 MHz / 400 ns) do not preclude substitution, as faster specifications are backward compatible with designs specified for slower operation.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Memory Interface	Clock Frequency	Access Time	Voltage Supply	Operating Temperature	Package	Product Status
24LC025T/ST	Microchip Technology	2Kbit	I2C	400 kHz	900 ns	2.5V ~ 5.5V	0°C ~ 70°C	8-TSSOP	Obsolete
24LC025/ST	Microchip Technology	2Kbit	I2C	400 kHz	900 ns	2.5V ~ 5.5V	0°C ~ 70°C	8-TSSOP	Active
24AA02/ST	Microchip Technology	2Kbit	I2C	400 kHz	900 ns	1.7V ~ 5.5V	0°C ~ 70°C	8-TSSOP	Active
24AA024HT-I/ST	Microchip Technology	2Kbit	I2C	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA024T-I/ST	Microchip Technology	2Kbit	I2C	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA025T-I/ST	Microchip Technology	2Kbit	I2C	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA02HT-I/ST	Microchip Technology	2Kbit	I2C	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA02T-I/ST	Microchip Technology	2Kbit	I2C	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA52T-I/ST	Microchip Technology	2Kbit	I2C	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24LC024-I/ST	Microchip Technology	2Kbit	I2C	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24LC024HT-E/ST	Microchip Technology	2Kbit	I2C	1 MHz	400 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active

Engineering Selection Recommendations

Primary Substitute - Direct Replacement: 24LC025/ST is the direct active equivalent, maintaining identical electrical specifications and packaging. This part is recommended as the first choice for direct substitution in existing designs.

Secondary Substitutes - Extended Voltage Range: 24AA02/ST, 24AA024HT-I/ST, 24AA024T-I/ST, 24AA025T-I/ST, 24AA02HT-I/ST, and 24AA02T-I/ST provide extended lower voltage operation (1.7V minimum) while maintaining the 2.5V ~ 5.5V compatibility window. These parts are suitable for applications requiring lower supply voltage operation.

Extended Temperature Substitutes: 24AA024HT-I/ST, 24AA024T-I/ST, 24AA025T-I/ST, 24AA02HT-I/ST, 24AA02T-I/ST, 24AA52T-I/ST, 24LC024-I/ST, and 24LC024HT-E/ST support operating temperatures from -40°C to 85°C or -40°C to 125°C, accommodating thermal requirements beyond the original 0°C ~ 70°C specification.

High-Speed Variant: 24LC024HT-E/ST operates at 1 MHz clock frequency with 400 ns access time and -40°C ~ 125°C temperature range, providing enhanced performance and thermal margin for demanding applications.

All substitute parts maintain ROHS3 compliance and 8-TSSOP surface mount packaging, ensuring PCB layout and assembly process compatibility.

Frequently Asked Questions (FAQ)

Q: Can 24AA02/ST replace 24LC025T/ST in all applications? A: 24AA02/ST is electrically compatible for applications operating within the 2.5V ~ 5.5V supply range. The extended lower voltage specification (1.7V minimum) does not affect compatibility with designs specified for 2.5V minimum operation. Both parts maintain identical memory capacity, I2C interface, clock frequency, and access time specifications.

Q: What is the difference between 24LC and 24AA series parts? A: The 24LC series specifies a minimum supply voltage of 2.5V, while the 24AA series specifies 1.7V minimum. Both series are functionally equivalent for I2C EEPROM 2Kbit memory applications. Selection depends on the circuit's minimum supply voltage requirement.

Q: Why does 24LC024HT-E/ST have different clock frequency and access time? A: 24LC024HT-E/ST operates at 1 MHz clock frequency with 400 ns access time, compared to the standard 400 kHz / 900 ns specification. This represents a higher-performance variant suitable for applications requiring faster memory access. The faster specification is backward compatible with designs specified for 400 kHz operation.

Q: Are packaging differences between Tube and Tape & Reel significant for substitution? A: Packaging format (Tube versus Tape & Reel) affects supply chain and assembly processes but does not impact electrical or mechanical compatibility. Both packaging formats contain identical 8-TSSOP components suitable for surface mount assembly.

Q: What temperature range should I select for industrial applications? A: For industrial applications, parts supporting -40°C ~ 85°C or -40°C ~ 125°C operating temperature ranges are recommended. 24LC024HT-E/ST provides the widest temperature specification (-40°C ~ 125°C) combined with enhanced clock frequency performance.

Q: Is the 24AA52T-I/ST compatible with 3.3V supply systems? A: Yes. 24AA52T-I/ST specifies 1.8V ~ 5.5V supply range, which encompasses 3.3V operation. This part is suitable for 3.3V logic systems while maintaining compatibility with 5V systems.

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