24AA32AF-I/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24AA32AF-I/ST is a 32Kbit I2C EEPROM memory IC manufactured by Microchip Technology, housed in an 8-TSSOP surface mount package. This non-volatile memory device operates at 400 kHz I2C clock frequency with 900 ns access time and supports a supply voltage range of 1.7V to 5.5V across an operating temperature range of -40°C to 85°C. The device is ROHS3 compliant and carries an MSL rating of 1 (Unlimited). Equivalent and substitute parts are identified based on matching memory capacity, I2C interface protocol, package form factor, and electrical operating parameters that ensure functional interchangeability in circuit applications.

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	1.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 24AA32AF-I/ST are selected based on the following critical parameters that determine functional interchangeability:

Primary Matching Criteria:

Memory capacity: 32Kbit
Memory organization: 4K x 8
Interface protocol: I2C
Package type: 8-TSSOP or compatible 8-pin surface mount variants
Supply voltage compatibility: minimum 1.7V support
Operating temperature range: -40°C to 85°C minimum
Write cycle time: 5ms
RoHS3 compliance

Secondary Compatibility Factors:

Clock frequency: 400 kHz or higher (higher frequencies remain backward compatible)
Access time: 900 ns or faster (faster access times are acceptable)
Voltage supply upper limit: 5.5V or higher
MSL rating: 1 (Unlimited)

Substitutes are grouped into two categories: direct equivalents from Microchip Technology and cross-manufacturer alternatives from Rohm Semiconductor, onsemi, and STMicroelectronics that meet all primary matching criteria.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temp	Package	RoHS3
24AA32AF-I/ST	Microchip Technology	32Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Yes
24AA32A-I/ST	Microchip Technology	32Kbit	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Yes
BR24G32FVM-3AGTTR	Rohm Semiconductor	32Kbit	1 MHz	Not specified	1.7V ~ 5.5V	-40°C ~ 85°C	8-MSOP	Yes
BR24G32FVT-3AGE2	Rohm Semiconductor	32Kbit	1 MHz	Not specified	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Yes
BR24G32FVT-3GE2	Rohm Semiconductor	32Kbit	400 kHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Yes
BR24T32FVM-WTR	Rohm Semiconductor	32Kbit	400 kHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-MSOP	Yes
CAT24C32YI-G	onsemi	32Kbit	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Yes
CAT24C32YI-GT3	onsemi	32Kbit	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Yes
CAV24C32YE-GT3	onsemi	32Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Yes
M24C32-DFDW6TP	STMicroelectronics	32Kbit	1 MHz	450 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Yes
M24C32-FDW6TP	STMicroelectronics	32Kbit	1 MHz	450 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Yes

Engineering Selection Recommendations

Direct Microchip Equivalent: The 24AA32A-I/ST from Microchip Technology is the primary direct equivalent. It maintains identical memory capacity, I2C interface, clock frequency, access time, and package configuration. The only parameter variance is the minimum supply voltage of 1.8V versus 1.7V on the original part. This substitute is suitable for applications where the minimum supply voltage requirement of 1.8V is acceptable.

onsemi Substitutes: The CAT24C32YI-G and CAT24C32YI-GT3 from onsemi provide 32Kbit I2C EEPROM functionality in 8-TSSOP packaging with enhanced clock frequency of 1 MHz and faster access time of 400 ns. Both maintain the 1.7V to 5.5V supply range and -40°C to 85°C operating temperature. These parts are direct pin-compatible substitutes with improved performance characteristics.

The CAV24C32YE-GT3 from onsemi matches the original part's 400 kHz clock frequency and 900 ns access time in 8-TSSOP packaging. This part carries automotive-grade qualification (AEC-Q100) and operates across an extended temperature range of -40°C to 125°C. The minimum supply voltage is 2.5V, which restricts use in applications requiring operation below 2.5V.

Rohm Semiconductor Substitutes: The BR24G32FVT-3AGE2 and BR24G32FVM-3AGTTR from Rohm Semiconductor provide 32Kbit I2C EEPROM with 1 MHz clock frequency in 8-TSSOP-B and 8-MSOP packages respectively. Both support 1.7V to 5.5V supply range and -40°C to 85°C operating temperature. The BR24G32FVT-3GE2 operates at 400 kHz matching the original part's clock frequency with 1.6V minimum supply voltage in 8-TSSOP-B packaging. The BR24T32FVM-WTR provides 400 kHz operation in 8-MSOP packaging with 1.6V minimum supply voltage.

STMicroelectronics Substitutes: The M24C32-DFDW6TP and M24C32-FDW6TP from STMicroelectronics offer 32Kbit I2C EEPROM with 1 MHz clock frequency and 450 ns access time in 8-TSSOP packaging. Both maintain 1.7V to 5.5V supply range and -40°C to 85°C operating temperature, providing enhanced performance over the original part.

All substitute parts listed carry ROHS3 compliance and MSL rating of 1 (Unlimited), ensuring compatibility with standard manufacturing and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 24AA32AF-I/ST with the 24AA32A-I/ST? A: Yes. The 24AA32A-I/ST is a direct Microchip equivalent with identical memory capacity, interface, clock frequency, and package. The minimum supply voltage is 1.8V instead of 1.7V. Verify your application's minimum supply voltage requirement before substitution.

Q: Are the onsemi CAT24C32YI parts pin-compatible with the 24AA32AF-I/ST? A: Yes. The CAT24C32YI-G and CAT24C32YI-GT3 are pin-compatible 8-TSSOP devices with identical memory organization and I2C interface. They operate at 1 MHz clock frequency with 400 ns access time, both faster than the original part's 400 kHz and 900 ns specifications.

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). Verify PCB footprint compatibility before selecting parts with different package types.

Q: Can I use the CAV24C32YE-GT3 in place of the 24AA32AF-I/ST? A: The CAV24C32YE-GT3 is functionally compatible with matching 400 kHz clock frequency and 900 ns access time in 8-TSSOP packaging. However, its minimum supply voltage is 2.5V. Use this substitute only if your application operates at 2.5V or higher. The extended temperature range of -40°C to 125°C and automotive qualification are additional features not present in the original part.

Q: Do all substitute parts support the same I2C clock frequency as the original? A: No. The original 24AA32AF-I/ST operates at 400 kHz. Rohm Semiconductor BR24G32FVM-3AGTTR, BR24G32FVT-3AGE2, and onsemi CAT24C32YI parts operate at 1 MHz. Higher clock frequencies are backward compatible with 400 kHz I2C bus systems. The BR24G32FVT-3GE2 and BR24T32FVM-WTR match the original 400 kHz specification.

Q: Are all listed substitutes ROHS3 compliant? A: Yes. All substitute parts listed carry ROHS3 compliance certification, matching the original part's environmental compliance status.

Q: What is the significance of MSL rating 1 (Unlimited)? A: MSL 1 (Unlimited) indicates the component has unlimited shelf life and does not require special moisture control during storage or handling. All listed parts carry this rating, ensuring standard storage and manufacturing compatibility.

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