Equivalent & Substitute Parts for 24AA02/ST

Part Overview

The 24AA02/ST is a 2Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface communication at 400 kHz with 900 ns access time in an 8-TSSOP surface mount package. This device operates across a supply voltage range of 1.7V to 5.5V and is rated for 0°C to 70°C operating temperature. The part is currently in active product status with 2200 units in stock.

Equivalent and substitute parts are identified when designs require extended temperature range operation (-40°C to 85°C), higher clock frequency capability (1 MHz), alternative packaging formats, or when primary part availability is constrained. Substitutes maintain functional compatibility through identical memory capacity, organization, and I2C interface specifications while meeting the same RoHS3 and REACH compliance requirements.

Key Parameters

Parameter	24AA02/ST
Memory Size	2Kbit
Memory Organization	256 x 8
Memory Interface	I2C
Clock Frequency	400 kHz
Access Time	900 ns
Write Cycle Time	5 ms
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
Product Status	Active

Substitute Part Grouping Explanation

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

Core Compatibility Requirements (Non-Negotiable):

Memory Size: 2Kbit
Memory Organization: 256 x 8
Memory Interface: I2C
Package / Case: 8-TSSOP (0.173", 4.40mm Width)
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Write Cycle Time: 5 ms

Allowable Variation Parameters:

Clock Frequency: 400 kHz or 1 MHz (higher frequency is backward compatible)
Access Time: 900 ns or 550 ns (faster access is backward compatible)
Operating Temperature: 0°C ~ 70°C or -40°C ~ 85°C (extended range is backward compatible)
Voltage Supply Range: 1.7V ~ 5.5V or 1.6V ~ 5.5V or 2.5V ~ 5.5V (subset ranges are acceptable if application requirements are met)
Packaging Format: Tube, Cut Tape & Digi-Reel, Bulk, or Tape & Reel (packaging does not affect electrical function)
Manufacturer: Microchip Technology, STMicroelectronics, Rohm Semiconductor, or onsemi

Parts that deviate from core compatibility requirements are not listed as substitutes.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Operating Temperature	Voltage Supply	Package	Product Status
24AA02/ST	Microchip Technology	2Kbit	400 kHz	900 ns	0°C ~ 70°C	1.7V ~ 5.5V	8-TSSOP	Active
24AA02-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	-40°C ~ 85°C	1.7V ~ 5.5V	8-TSSOP	Active
24AA024-I/ST	Microchip Technology	2Kbit	400 kHz	900 ns	-40°C ~ 85°C	1.7V ~ 5.5V	8-TSSOP	Active
AT24CS02-XHM-T	Microchip Technology	2Kbit	1 MHz	550 ns	-40°C ~ 85°C	1.7V ~ 5.5V	8-TSSOP	Active
AT24HC02C-XHM-B	Microchip Technology	2Kbit	1 MHz	550 ns	-40°C ~ 85°C	1.7V ~ 5.5V	8-TSSOP	Active
BR24G02FVT-3AGE2	Rohm Semiconductor	2Kbit	1 MHz	Not Specified	-40°C ~ 85°C	1.6V ~ 5.5V	8-TSSOP-B	Active
BR24G02FVT-3GE2	Rohm Semiconductor	2Kbit	400 kHz	Not Specified	-40°C ~ 85°C	1.6V ~ 5.5V	8-TSSOP-B	Active
BR24T02FVT-WGE2	ROHM Semiconductor	2Kbit	400 kHz	Not Specified	-40°C ~ 85°C	1.6V ~ 5.5V	8-TSSOP-B	Active
CAT34C02YI-GT5A	onsemi	2Kbit	400 kHz	900 ns	-40°C ~ 85°C	1.7V ~ 5.5V	8-TSSOP	Active
M24C02-FDW6TP	STMicroelectronics	2Kbit	400 kHz	900 ns	-40°C ~ 85°C	1.7V ~ 5.5V	8-TSSOP	Active
M24C02-WDW6TP	STMicroelectronics	2Kbit	400 kHz	900 ns	-40°C ~ 85°C	2.5V ~ 5.5V	8-TSSOP	Not For New Designs

Engineering Selection Recommendations

For Extended Temperature Range Applications (-40°C to 85°C): Select 24AA02-I/ST, 24AA024-I/ST, AT24CS02-XHM-T, AT24HC02C-XHM-B, CAT34C02YI-GT5A, or M24C02-FDW6TP. These parts maintain identical electrical specifications to the 24AA02/ST while supporting the full industrial temperature range. All are in active product status with RoHS3 compliance.

For Higher Clock Frequency Requirements (1 MHz): Select AT24CS02-XHM-T or AT24HC02C-XHM-B from Microchip Technology, or BR24G02FVT-3AGE2 from Rohm Semiconductor. These devices support 1 MHz I2C operation with faster 550 ns access time, providing performance headroom for timing-critical applications while maintaining 2Kbit capacity and 8-TSSOP packaging.

For Standard Temperature Range (0°C to 70°C) with Extended Availability: Select CAT34C02YI-GT5A from onsemi or M24C02-FDW6TP from STMicroelectronics. Both maintain the 400 kHz clock frequency and 900 ns access time of the original part while offering higher inventory levels (21,561 and 17,178 units respectively).

Avoid for New Designs: M24C02-WDW6TP is marked "Not For New Designs" and features a reduced voltage supply range (2.5V ~ 5.5V). This part is suitable only for legacy system maintenance where the original specification is already in production.

Rohm Semiconductor Alternatives (BR24G02 and BR24T02 Series): These parts use 8-TSSOP-B packaging variant and feature a lower minimum supply voltage (1.6V vs. 1.7V). Verify PCB footprint compatibility with standard 8-TSSOP before selection, as the "-B" designation indicates a package variant.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 24AA02/ST with a part rated for -40°C to 85°C in a 0°C to 70°C application?

A: Yes. Extended temperature range parts are backward compatible with narrower temperature specifications. A part rated -40°C to 85°C will function correctly in a 0°C to 70°C environment. However, this substitution increases component cost without providing application benefit.

Q: What is the difference between 8-TSSOP and 8-TSSOP-B packaging?

A: Both are 8-pin thin shrink small outline packages with 0.173" width and 4.40mm body width. The "-B" designation indicates a package variant from Rohm Semiconductor. Verify footprint compatibility with your PCB design before substitution, as minor dimensional variations may exist between manufacturers.

Q: Can I use a 1 MHz I2C EEPROM (AT24CS02-XHM-T) in place of the 400 kHz 24AA02/ST?

A: Yes. Higher clock frequency capability is backward compatible. A 1 MHz device will operate correctly at 400 kHz I2C bus speeds. This substitution is appropriate when extended temperature range and faster access time (550 ns vs. 900 ns) provide system benefits.

Q: Why is M24C02-WDW6TP marked "Not For New Designs"?

A: This part has reached end-of-life status and is retained in inventory for legacy system support only. The reduced voltage supply range (2.5V ~ 5.5V minimum vs. 1.7V) also limits its applicability to modern low-power designs. Use active status alternatives for new product development.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 Compliant certification and REACH Unaffected status, matching the environmental compliance profile of the 24AA02/ST.

Q: What is the inventory status of substitute parts?

A: Current inventory levels range from 1,342 to 529,992 units across all substitute options. CAT34C02YI-GT5A (21,561 units), M24C02-WDW6TP (529,992 units), and AT24CS02-XHM-T (15,684 units) offer the highest availability for immediate procurement.

Q: Can I mix different manufacturers' EEPROM parts in the same design?

A: Yes. All listed substitutes maintain identical I2C protocol, memory organization (256 x 8), and write cycle timing (5 ms). Electrical and functional compatibility is assured across Microchip Technology, STMicroelectronics, Rohm Semiconductor, and onsemi devices within the specified parameter ranges.

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