Equivalent & Substitute Parts for 24AA32AX-I/ST

Part Overview

The Microchip Technology 24AA32AX-I/ST is a 32Kbit EEPROM memory IC with I2C interface, designed for non-volatile data storage applications. This device operates at 400 kHz clock frequency with 900 ns access time and supports a supply voltage range of 1.8V to 5.5V across an operating temperature range of -40°C to 125°C. The part is currently in active production status and available in 8-TSSOP surface mount packaging.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative packaging or performance characteristics better suit specific application requirements, or when design flexibility is needed across multiple suppliers to ensure supply chain continuity.

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	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
Package Type	8-TSSOP
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the 24AA32AX-I/ST is determined by the following critical parameters:

Core Functional Requirements:

Memory capacity: 32Kbit
Memory organization: 4K x 8
Interface protocol: I2C
Write cycle time: 5ms

Electrical Compatibility:

Clock frequency: 400 kHz (primary specification; higher frequencies are compatible but not required)
Access time: 900 ns or faster
Supply voltage range: Must encompass or overlap with 1.8V ~ 5.5V
Operating temperature: Must support -40°C ~ 125°C or a subset thereof

Physical Compatibility:

Package type: 8-TSSOP preferred; 8-MSOP and 8-LSSOP variants acceptable with PCB layout verification
Mounting type: Surface mount

Substitute parts are grouped into three categories based on these parameters:

Category 1 - Direct Equivalents (400 kHz, 8-TSSOP): Parts maintaining identical clock frequency and primary package type.

Category 2 - Performance Upgrades (1 MHz, 8-TSSOP/8-MSOP): Parts with higher clock frequency and alternative compact packages, suitable when faster I2C communication is beneficial.

Category 3 - Legacy/Specialized (400 kHz, 8-LSSOP/8-SSOP): Parts with lower production status or specialized packaging, used when specific form factors are required.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temp	Package	Product Status
24AA32AX-I/ST	Microchip	32Kbit	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
BR24G32FVJ-3GTE2	Rohm	32Kbit	400 kHz	—	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Not For New Designs
BR24G32FVM-3AGTTR	Rohm	32Kbit	1 MHz	—	1.7V ~ 5.5V	-40°C ~ 85°C	8-MSOP	Active
BR24G32FVT-3AGE2	Rohm	32Kbit	1 MHz	—	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
BR24G32FVT-3GE2	Rohm	32Kbit	400 kHz	—	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
BR24L32FV-WE2	Rohm	32Kbit	400 kHz	—	1.8V ~ 5.5V	-40°C ~ 85°C	8-LSSOP	Not For New Designs
BR24L32FVT-WE2	Rohm	32Kbit	400 kHz	—	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
BR24T32FVM-WTR	Rohm	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
CAV24C32YE-GT3	onsemi	32Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
M24C32-DFDW6TP	STMicroelectronics	32Kbit	1 MHz	450 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): CAV24C32YE-GT3 (onsemi) is the closest functional equivalent, matching the 24AA32AX-I/ST in clock frequency (400 kHz), access time (900 ns), operating temperature range (-40°C ~ 125°C), and 8-TSSOP packaging. This part is in active production status. The supply voltage range (2.5V ~ 5.5V) is a subset of the original specification but remains compatible with standard 3.3V and 5V systems.

For Active Production with Voltage Compatibility: BR24L32FVT-WE2 (Rohm) maintains identical electrical specifications (400 kHz, 1.8V ~ 5.5V supply range, 5ms write cycle) and 8-TSSOP packaging. This part is in active production status and carries DiGi-Electronics Programmable verification.

For Higher Performance Requirements: BR24G32FVT-3AGE2 (Rohm) and CAT24C32YI-GT3 (onsemi) both operate at 1 MHz clock frequency with faster access times (400 ns), suitable for applications requiring higher I2C communication speeds. Both are in active production status. BR24G32FVT-3AGE2 maintains 8-TSSOP packaging; CAT24C32YI-GT3 also uses 8-TSSOP.

For Compact Packaging: BR24G32FVM-3AGTTR (Rohm) and BR24T32FVM-WTR (Rohm) use 8-MSOP packaging (0.110", 2.80mm width), reducing PCB footprint compared to 8-TSSOP. Both are in active production status.

Parts to Avoid for New Designs: BR24G32FVJ-3GTE2 and BR24L32FV-WE2 are marked "Not For New Designs" and should not be selected for new applications.

Frequently Asked Questions (FAQ)

Q: Can I use a 1 MHz part as a substitute for the 400 kHz 24AA32AX-I/ST? A: Yes. The 1 MHz parts (BR24G32FVT-3AGE2, CAT24C32YI-GT3, M24C32-DFDW6TP) are fully compatible. I2C bus speed is determined by the master controller, not the slave device. A 1 MHz-capable EEPROM operates correctly on a 400 kHz bus.

Q: What is the difference between 8-TSSOP, 8-MSOP, and 8-LSSOP packages? A: These are all 8-pin surface mount packages with different physical dimensions. 8-TSSOP (0.173", 4.40mm width) is the standard package for the 24AA32AX-I/ST. 8-MSOP (0.110", 2.80mm width) is more compact. 8-LSSOP (0.173", 4.40mm width) is similar in width but with different pin spacing. Package selection depends on PCB layout constraints and available footprints.

Q: Is the CAV24C32YE-GT3 suitable for automotive applications? A: The CAV24C32YE-GT3 carries AEC-Q100 automotive qualification and is rated for -40°C ~ 125°C operation, making it suitable for automotive-grade designs. The 24AA32AX-I/ST does not carry automotive qualification.

Q: What is the minimum supply voltage for each substitute? A: The 24AA32AX-I/ST operates from 1.8V. Most Rohm and STMicroelectronics substitutes operate from 1.6V or 1.7V. The onsemi CAV24C32YE-GT3 requires 2.5V minimum. Verify your system's minimum supply voltage against the selected part's specification.

Q: Are all these parts RoHS3 compliant? A: Yes. All listed parts carry RoHS3 compliance and REACH Unaffected status, meeting current environmental regulations.

Q: Can I mix different manufacturers in the same design? A: Yes. All listed parts implement the standard I2C EEPROM protocol with identical memory organization (4K x 8) and interface timing. They are electrically interchangeable within the specified parameter ranges. Verify package compatibility with your PCB layout.

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