Equivalent & Substitute Parts for 24LC32AXT-I/ST

Part Overview

The 24LC32AXT-I/ST is a 32Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface with 400 kHz clock frequency and 900 ns access time. This device is packaged in 8-TSSOP and operates across a supply voltage range of 2.5V to 5.5V with an operating temperature range of -40°C to 125°C. The part is currently in active production status with 693 units in stock.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when design requirements demand alternative performance characteristics such as higher clock frequency or extended temperature ranges, or when supply chain optimization requires sourcing from multiple manufacturers while maintaining functional compatibility.

Key Parameters

Parameter	Value
Memory Size	32Kbit
Memory Organization	4K x 8
Memory Interface	I2C
Clock Frequency	400 kHz
Write Cycle Time	5ms
Access Time	900 ns
Voltage Supply Range	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
Package Type	8-TSSOP
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 24LC32AXT-I/ST is determined by the following core parameters: 32Kbit memory capacity, 4K x 8 organization, I2C interface protocol, 5ms write cycle time, and surface mount 8-pin packaging. Parts meeting these criteria are classified into two substitution categories:

MFR Recommended Substitutes maintain functional equivalence with the primary part while offering variations in clock frequency (400 kHz or 1 MHz), supply voltage range (1.6V to 5.5V or 1.7V to 5.5V), and operating temperature range (-40°C to 85°C). These parts are sourced from Rohm Semiconductor and STMicroelectronics and carry active or legacy product status designations.

Parametric Equivalents match all electrical and mechanical specifications of the primary part, including 400 kHz clock frequency, 900 ns access time, 2.5V to 5.5V supply range, and -40°C to 125°C operating temperature. The CAV24C32YE-GT3 from onsemi is classified as a parametric equivalent and includes automotive-grade qualification (AEC-Q100).

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temperature	Package	Product Status
24LC32AXT-I/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
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
CAV24C32YE-GT3	onsemi	32Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active

Engineering Selection Recommendations

For Direct Replacement with Identical Specifications: The CAV24C32YE-GT3 from onsemi is the parametric equivalent offering identical electrical performance, access time, supply voltage range, and operating temperature range as the 24LC32AXT-I/ST. This part is active in production and carries AEC-Q100 automotive qualification, making it suitable for applications requiring extended temperature operation and automotive-grade reliability.

For Active Production with Modified Operating Temperature: The BR24G32FVT-3GE2 and BR24L32FVT-WE2 from Rohm Semiconductor maintain 400 kHz clock frequency and 8-TSSOP packaging but operate within -40°C to 85°C temperature range. Both parts are in active production status. The BR24G32FVT-3GE2 supports 1.6V minimum supply voltage, while BR24L32FVT-WE2 requires 1.8V minimum.

For Enhanced Clock Frequency: The BR24G32FVT-3AGE2 and M24C32-DFDW6TP offer 1 MHz clock frequency in 8-TSSOP packaging, providing faster I2C communication compared to the 400 kHz primary part. Both are in active production. The M24C32-DFDW6TP additionally provides 450 ns access time.

For Legacy Design Continuation: The BR24G32FVJ-3GTE2 and BR24L32FV-WE2 are designated "Not For New Designs" and should be used only for sustaining production of existing designs where component continuity is required.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 24LC32AXT-I/ST with any of the listed parts in a new design? A: For new designs, select only parts with "Active" product status. The CAV24C32YE-GT3 provides identical specifications. The BR24G32FVT-3AGE2, BR24G32FVT-3GE2, BR24L32FVT-WE2, BR24T32FVM-WTR, M24C32-DFDW6TP, and M24C32-XDW5TP are all active alternatives with functional compatibility.

Q: What is the difference between the 400 kHz and 1 MHz clock frequency options? A: Clock frequency determines I2C communication speed. The 400 kHz variants (BR24G32FVT-3GE2, BR24L32FVT-WE2, BR24T32FVM-WTR) match the primary part's speed. The 1 MHz variants (BR24G32FVT-3AGE2, BR24G32FVM-3AGTTR, M24C32-DFDW6TP, M24C32-XDW5TP) enable faster data transfer but require I2C bus support for 1 MHz operation.

Q: Are there package differences I should consider? A: The primary part uses 8-TSSOP (0.173", 4.40mm width). Most substitutes maintain this package. The BR24G32FVM-3AGTTR and BR24T32FVM-WTR use 8-MSOP (0.110", 2.80mm width), which is physically smaller. The BR24L32FV-WE2 uses 8-LSSOP (0.173", 4.40mm width). Package selection affects PCB layout and thermal characteristics.

Q: What is the significance of the operating temperature range difference? A: The primary part operates -40°C to 125°C. Most substitutes operate -40°C to 85°C, which is adequate for industrial applications. If your design requires operation above 85°C, only the CAV24C32YE-GT3 maintains the full -40°C to 125°C range.

Q: Can I use the M24C32-XDW5TP if my application requires -40°C operation? A: The M24C32-XDW5TP operates -20°C to 85°C, which does not meet the -40°C minimum requirement. Use the M24C32-DFDW6TP (-40°C to 85°C) or CAV24C32YE-GT3 (-40°C to 125°C) for extended low-temperature operation.

Q: What does "Not For New Designs" mean for BR24G32FVJ-3GTE2 and BR24L32FV-WE2? A: This designation indicates the manufacturer has discontinued active development and recommends against using these parts in new product designs. They remain available for sustaining existing production but should not be selected for new applications.

Q: Is the CAV24C32YE-GT3 suitable for automotive applications? A: Yes. The CAV24C32YE-GT3 carries AEC-Q100 automotive qualification and is graded for automotive use, making it appropriate for automotive-grade designs requiring extended temperature operation.

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