24LC32AT-I/SM Equivalent & Substitute Parts

Part Overview

The 24LC32AT-I/SM is a 32Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface communication at 400 kHz with 900 ns access time. This non-volatile memory device operates across a 2.5V to 5.5V supply range and is housed in an 8-SOIJ surface mount package. The part is currently in active production status and is ROHS3 compliant with unlimited moisture sensitivity rating.

Substitute parts are necessary when the original part becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when enhanced performance specifications (such as higher clock frequency or faster access time) are beneficial for system requirements.

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 ~ 85°C
Package Type	8-SOIC (0.209", 5.30mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 24LC32AT-I/SM 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
Operating temperature range: -40°C ~ 85°C
RoHS compliance: ROHS3

Electrical Compatibility Criteria:

Voltage supply range must encompass or be compatible with 2.5V ~ 5.5V
Clock frequency of 400 kHz or higher
Access time of 900 ns or faster

Mechanical Compatibility:

Surface mount technology
8-pin SOIC package variants (width variations acceptable: 0.154" to 0.209")

Substitute parts are grouped into two categories: direct functional equivalents with identical specifications and enhanced-performance alternatives with superior electrical characteristics (higher clock frequency, faster access time, or wider voltage range).

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Package Width	Product Status	Packaging Format
24LC32AT-I/SM	Microchip Technology	32Kbit	400 kHz	900 ns	2.5V ~ 5.5V	0.209"	Active	Cut Tape & Digi-Reel
24LC32A-I/SM	Microchip Technology	32Kbit	400 kHz	900 ns	2.5V ~ 5.5V	0.209"	Active	Tube
BR24G32F-3GTE2	Rohm Semiconductor	32Kbit	400 kHz	Not specified	1.6V ~ 5.5V	0.173"	Active	Tape & Reel
BR24T32F-WE2	Rohm Semiconductor	32Kbit	400 kHz	Not specified	1.6V ~ 5.5V	0.173"	Active	Tape & Reel
M24C32-DFMN6TP	STMicroelectronics	32Kbit	1 MHz	450 ns	1.7V ~ 5.5V	0.154"	Active	Tape & Reel
M24C32-RMN6P	STMicroelectronics	32Kbit	1 MHz	450 ns	1.8V ~ 5.5V	0.154"	Active	Bulk
M24C32-RMN6TP	STMicroelectronics	32Kbit	1 MHz	450 ns	1.8V ~ 5.5V	0.154"	Active	Cut Tape & Digi-Reel
M24C32-WMN6P	STMicroelectronics	32Kbit	1 MHz	450 ns	2.5V ~ 5.5V	0.154"	Not For New Designs	Tube
M24C32-WMN6TP	STMicroelectronics	32Kbit	1 MHz	450 ns	2.5V ~ 5.5V	0.154"	Not For New Designs	Cut Tape & Digi-Reel

Engineering Selection Recommendations

Direct Functional Equivalent (Identical Specifications): The 24LC32A-I/SM from Microchip Technology is a direct functional equivalent with matching electrical and timing specifications. Selection between 24LC32AT-I/SM and 24LC32A-I/SM depends solely on packaging format requirements: Cut Tape & Digi-Reel versus Tube.

Enhanced Performance Alternatives (STMicroelectronics M24C32 Series): The M24C32-DFMN6TP, M24C32-RMN6P, M24C32-RMN6TP, M24C32-WMN6P, and M24C32-WMN6TP offer superior performance with 1 MHz clock frequency and 450 ns access time, representing a 2.5x improvement in clock speed and 50% reduction in access time. These parts maintain identical memory capacity and organization. The M24C32-DFMN6TP and M24C32-RMN6TP are verified as DiGi-Electronics programmable and carry Active product status, making them preferred for new designs. M24C32-WMN6P and M24C32-WMN6TP are designated "Not For New Designs" and should be avoided for new applications.

Rohm Semiconductor Alternatives (BR24G32F-3GTE2 and BR24T32F-WE2): Both Rohm parts maintain 400 kHz clock frequency matching the original specification and offer extended lower voltage operation (1.6V minimum). These represent functional equivalents with different package dimensions (0.173" width versus 0.209" width).

Compliance and Certification: All substitute parts maintain ROHS3 compliance, unlimited moisture sensitivity rating, and identical ECCN and HTSUS classifications. Parts verified as DiGi-Electronics programmable include 24LC32AT-I/SM, M24C32-DFMN6TP, M24C32-WMN6P, and M24C32-WMN6TP.

Frequently Asked Questions (FAQ)

Q: Can I substitute 24LC32A-I/SM for 24LC32AT-I/SM? A: Yes. Both parts are manufactured by Microchip Technology with identical electrical specifications, memory capacity, interface protocol, and operating parameters. The only difference is packaging format: 24LC32A-I/SM is supplied in Tube format while 24LC32AT-I/SM is supplied in Cut Tape & Digi-Reel format.

Q: What are the advantages of using M24C32 series parts from STMicroelectronics? A: The M24C32 series offers 2.5x higher clock frequency (1 MHz versus 400 kHz) and 50% faster access time (450 ns versus 900 ns). These enhanced specifications provide improved data transfer rates and system responsiveness. However, package dimensions are smaller (0.154" width versus 0.209" width), requiring PCB layout verification.

Q: Are Rohm Semiconductor BR24G32F-3GTE2 and BR24T32F-WE2 compatible with my application? A: Both Rohm parts are functionally compatible with identical 32Kbit capacity, 4K x 8 organization, I2C interface, and 400 kHz clock frequency. They support lower minimum voltage operation (1.6V versus 2.5V). Package width is reduced to 0.173", requiring PCB footprint verification before substitution.

Q: Should I use M24C32-WMN6P or M24C32-WMN6TP for new designs? A: No. Both parts carry "Not For New Designs" product status. Use M24C32-DFMN6TP or M24C32-RMN6TP instead, which are designated Active and verified as DiGi-Electronics programmable.

Q: What voltage range compatibility must I verify when substituting parts? A: The original 24LC32AT-I/SM operates at 2.5V ~ 5.5V. Rohm parts (BR24G32F-3GTE2, BR24T32F-WE2) support 1.6V ~ 5.5V, and STMicroelectronics M24C32-DFMN6TP supports 1.7V ~ 5.5V. Verify your system's actual supply voltage falls within the substitute part's specified range.

Q: Does package width difference affect circuit board compatibility? A: Yes. The original 24LC32AT-I/SM uses 0.209" width 8-SOIC package. Rohm parts use 0.173" width and STMicroelectronics parts use 0.154" width. Smaller packages may fit existing footprints, but larger packages will not. PCB layout and footprint verification is required before substitution.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance, matching the original 24LC32AT-I/SM specification.

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