24LC32AXT-E/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24LC32AXT-E/ST is a 32Kbit I2C EEPROM memory IC manufactured by Microchip Technology, supplied in 8-TSSOP packaging. This non-volatile memory device operates at 400 kHz I2C clock frequency with a 900 ns access time and supports supply voltages from 2.5V to 5.5V across an operating temperature range of -40°C to 125°C. The part is currently in active production status and ROHS3 compliant.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative manufacturers offer improved inventory levels, or when design flexibility permits selection from multiple qualified sources meeting identical electrical and mechanical specifications.

Key Parameters

Parameter	Value
Memory Size	32Kbit
Memory Organization	4K 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	-40°C ~ 125°C
Package Type	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 24LC32AXT-E/ST are qualified based on the following electrical and mechanical parameters:

Core Compatibility Requirements:

Memory Size: 32Kbit
Memory Organization: 4K x 8
Memory Interface: I2C
Write Cycle Time: 5ms
Package Type: 8-TSSOP or compatible surface mount packages
RoHS3 Compliance

Acceptable Parameter Variations:

Clock Frequency: 400 kHz or higher (1 MHz variants acceptable)
Access Time: 900 ns or faster
Voltage Supply Range: Must encompass minimum 1.6V to 5.5V
Operating Temperature: Minimum -40°C to maximum 85°C or higher
Mounting Type: Surface mount only

Substitutes are grouped by manufacturer and clock frequency capability. Parts operating at 1 MHz I2C frequency are direct substitutes for 400 kHz applications. Parts with lower minimum supply voltage (1.6V, 1.7V, 1.8V) are compatible with the 2.5V minimum requirement of the primary part.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temperature	Package Type	Product Status
24LC32AXT-E/ST	Microchip Technology	32Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
BR24G32FVJ-3GTE2	Rohm Semiconductor	32Kbit	400 kHz	—	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Not For New Designs
BR24G32FVM-3AGTTR	Rohm Semiconductor	32Kbit	1 MHz	—	1.7V ~ 5.5V	-40°C ~ 85°C	8-MSOP	Active
BR24G32FVT-3AGE2	Rohm Semiconductor	32Kbit	1 MHz	—	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
BR24G32FVT-3GE2	Rohm Semiconductor	32Kbit	400 kHz	—	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
BR24L32FV-WE2	Rohm Semiconductor	32Kbit	400 kHz	—	1.8V ~ 5.5V	-40°C ~ 85°C	8-LSSOP	Not For New Designs
BR24L32FVT-WE2	Rohm Semiconductor	32Kbit	400 kHz	—	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
BR24T32FVM-WTR	Rohm Semiconductor	32Kbit	400 kHz	—	1.6V ~ 5.5V	-40°C ~ 85°C	8-MSOP	Active
CAT24C32YI-GT3	onsemi	32Kbit	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
M24C32-DFDW6TP	STMicroelectronics	32Kbit	1 MHz	450 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
M24C32-XDW5TP	STMicroelectronics	32Kbit	1 MHz	450 ns	1.6V ~ 5.5V	-20°C ~ 85°C	8-TSSOP	Active

Engineering Selection Recommendations

Primary Substitutes (Identical Package, 400 kHz Operation): BR24G32FVT-3GE2 and BR24L32FVT-WE2 are direct substitutes maintaining 8-TSSOP packaging and 400 kHz I2C frequency. Both are ROHS3 compliant and active production parts. BR24L32FVT-WE2 carries DiGi-Electronics Programmable verification status.

Active Production Alternatives (1 MHz Capable): CAT24C32YI-GT3 (onsemi), M24C32-DFDW6TP, and M24C32-XDW5TP (STMicroelectronics) operate at 1 MHz I2C frequency with faster access times (400 ns and 450 ns respectively). All maintain 8-TSSOP packaging and ROHS3 compliance. These parts are suitable for applications where higher I2C clock speeds are acceptable.

Package Variants (Alternative Footprints): BR24G32FVM-3AGTTR and BR24T32FVM-WTR provide 8-MSOP packaging alternatives while maintaining 32Kbit capacity and I2C interface. These are appropriate when PCB layout constraints permit different package geometries.

Avoid for New Designs: BR24G32FVJ-3GTE2 and BR24L32FV-WE2 carry "Not For New Designs" status and should not be selected for new applications despite electrical compatibility.

Temperature Range Consideration: The primary part operates to 125°C. All substitute parts operate to maximum 85°C. Applications requiring operation above 85°C cannot use these substitutes.

Frequently Asked Questions (FAQ)

Q: Can I use a 1 MHz I2C part as a substitute for the 400 kHz 24LC32AXT-E/ST?

A: Yes. Parts operating at 1 MHz I2C frequency (CAT24C32YI-GT3, M24C32-DFDW6TP, M24C32-XDW5TP) are backward compatible with 400 kHz I2C bus systems. The I2C interface operates at the lower clock speed when connected to a 400 kHz master.

Q: What is the difference between 8-TSSOP and 8-MSOP packages?

A: Both are 8-pin surface mount packages with different physical dimensions. 8-TSSOP measures 0.173" width (4.40mm), while 8-MSOP measures 0.110" width (2.80mm). Package selection depends on PCB layout requirements. Footprints are not interchangeable.

Q: Why does the primary part specify 2.5V minimum supply while substitutes specify 1.6V or 1.7V minimum?

A: The primary part's 2.5V minimum is a design specification. Substitute parts with lower minimum voltage ratings (1.6V, 1.7V, 1.8V) are electrically compatible and will operate correctly at 2.5V and above. The lower minimum rating provides additional design flexibility but does not affect compatibility.

Q: Can I use BR24G32FVJ-3GTE2 in a new design?

A: No. This part carries "Not For New Designs" status, indicating the manufacturer has discontinued active development. Use active production alternatives such as BR24G32FVT-3GE2 or BR24L32FVT-WE2 instead.

Q: What is the significance of the 125°C operating temperature of the primary part?

A: The 24LC32AXT-E/ST operates to 125°C, while all substitute parts operate to maximum 85°C. If your application requires operation above 85°C, no substitute from this list is suitable. The primary part must be retained.

Q: Are all listed parts ROHS3 compliant?

A: Yes. All parts in this reference, including the primary part and all substitutes, carry ROHS3 compliance certification.

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