24LC32AT-E/SM EEPROM Equivalent & Substitute Parts

Part Overview

The 24LC32AT-E/SM is a 32Kbit I2C EEPROM memory IC manufactured by Microchip Technology, housed in an 8-SOIJ surface mount package. This non-volatile memory device operates across a 2.5V to 5.5V supply range with an I2C interface running at 400 kHz, providing 900 ns access time and 5ms write cycle time. The part is currently in active production status and RoHS3 compliant.

Equivalent and substitute parts are identified based on matching core electrical parameters: 32Kbit memory capacity, 4K x 8 organization, I2C interface protocol, and compatible operating temperature ranges. Substitutes may vary in clock frequency, access time, supply voltage tolerance, and physical package dimensions while maintaining functional compatibility in I2C-based applications.

Key Parameters

Parameter	24LC32AT-E/SM
Memory Type	Non-Volatile EEPROM
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 / Case	8-SOIJ (0.209", 5.30mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following core parameters:

Memory Capacity & Organization: All substitutes maintain 32Kbit capacity with 4K x 8 organization
Interface Protocol: All substitutes use I2C communication protocol
Write Cycle Time: All substitutes maintain 5ms write cycle time
Supply Voltage Compatibility: Substitutes operate within overlapping voltage ranges; designs using 2.5V ~ 5.5V must verify substitute minimum voltage requirements
Operating Temperature Range: The main part supports -40°C ~ 125°C; substitutes support -40°C ~ 85°C, limiting use in high-temperature applications above 85°C
Clock Frequency: Substitutes operate at 400 kHz or 1 MHz; higher frequency substitutes are backward compatible with 400 kHz designs
Package Compatibility: Physical package dimensions vary; PCB layout and footprint must accommodate package differences

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temp	Package / Case	Product Status
24LC32AT-E/SM	Microchip Technology	32Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIJ (5.30mm)	Active
BR24G32F-3GTE2	Rohm Semiconductor	32Kbit	400 kHz	—	1.6V ~ 5.5V	-40°C ~ 85°C	8-SOIC (4.40mm)	Active
BR24T32F-WE2	Rohm Semiconductor	32Kbit	400 kHz	—	1.6V ~ 5.5V	-40°C ~ 85°C	8-SOIC (4.40mm)	Active
M24C32-DFMN6TP	STMicroelectronics	32Kbit	1 MHz	450 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC (3.90mm)	Active
M24C32-RMN6P	STMicroelectronics	32Kbit	1 MHz	450 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC (3.90mm)	Active
M24C32-RMN6TP	STMicroelectronics	32Kbit	1 MHz	450 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC (3.90mm)	Active
M24C32-WMN6P	STMicroelectronics	32Kbit	1 MHz	450 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC (3.90mm)	Not For New Designs
M24C32-WMN6TP	STMicroelectronics	32Kbit	1 MHz	450 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC (3.90mm)	Not For New Designs

Engineering Selection Recommendations

For Active Production Designs:

Select from parts with Active product status: BR24G32F-3GTE2, BR24T32F-WE2, M24C32-DFMN6TP, M24C32-RMN6P, or M24C32-RMN6TP. All are RoHS3 compliant and REACH unaffected.

Temperature Range Considerations:

The 24LC32AT-E/SM supports operation to 125°C. Rohm and STMicroelectronics substitutes are limited to 85°C maximum. Applications requiring operation above 85°C must retain the original 24LC32AT-E/SM.

Supply Voltage Considerations:

The 24LC32AT-E/SM operates from 2.5V minimum. BR24G32F-3GTE2 and BR24T32F-WE2 operate from 1.6V minimum, providing wider low-voltage compatibility. M24C32-DFMN6TP operates from 1.7V minimum. M24C32-RMN6P and M24C32-RMN6TP operate from 1.8V minimum. M24C32-WMN6P and M24C32-WMN6TP match the 2.5V minimum of the original part.

Clock Frequency and Performance:

The 24LC32AT-E/SM operates at 400 kHz with 900 ns access time. BR24G32F-3GTE2 and BR24T32F-WE2 maintain 400 kHz operation. STMicroelectronics M24C32 variants operate at 1 MHz with 450 ns access time, providing improved performance while remaining backward compatible with 400 kHz I2C bus designs.

Package and PCB Layout:

The 24LC32AT-E/SM uses 8-SOIJ (5.30mm width). Rohm substitutes use 8-SOIC (4.40mm width). STMicroelectronics substitutes use 8-SOIC (3.90mm width). PCB footprints and layout must be verified for physical compatibility.

Lifecycle Status:

M24C32-WMN6P and M24C32-WMN6TP are marked "Not For New Designs." For new product development, avoid these parts and select from active status alternatives.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 24LC32AT-E/SM with any of these parts in my existing design?

A: Functional substitution is possible if your design operates within the substitute part's electrical specifications. Verify supply voltage range, maximum operating temperature, and I2C clock frequency compatibility. Physical package differences require PCB layout verification.

Q: What is the main difference between the Rohm and STMicroelectronics substitutes?

A: Rohm BR24G32F-3GTE2 and BR24T32F-WE2 maintain 400 kHz I2C operation matching the original part. STMicroelectronics M24C32 variants operate at 1 MHz, offering faster access time (450 ns vs. 900 ns) and higher I2C clock frequency. Both are electrically compatible with 400 kHz designs.

Q: Why do some substitutes have lower maximum operating temperatures?

A: The 24LC32AT-E/SM supports -40°C to 125°C. Rohm and STMicroelectronics substitutes support -40°C to 85°C. Applications requiring operation above 85°C must use the original 24LC32AT-E/SM or verify alternative parts with extended temperature ratings.

Q: Are all these parts RoHS3 compliant?

A: Yes, all listed parts are RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What does "Not For New Designs" mean for M24C32-WMN6P and M24C32-WMN6TP?

A: These parts are in mature lifecycle phase and should not be selected for new product development. Use active status alternatives: M24C32-DFMN6TP, M24C32-RMN6P, or M24C32-RMN6TP instead.

Q: Can I use a 1 MHz substitute in a 400 kHz I2C system?

A: Yes. I2C is backward compatible; devices rated for higher clock frequencies operate correctly at lower bus speeds. The 1 MHz M24C32 variants function in 400 kHz systems.

Q: Do package size differences affect electrical performance?

A: No. Package size differences (8-SOIJ vs. 8-SOIC variants) do not affect electrical performance. However, PCB footprints, trace routing, and thermal management may differ. Verify physical compatibility with your PCB layout before substitution.

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