24LC32A/SM EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24LC32A/SM is a 32Kbit I2C EEPROM memory IC manufactured by Microchip Technology, supplied in 8-SOIJ packaging as a tube. This non-volatile memory device operates at 400 kHz I2C clock frequency with 900 ns access time and supports supply voltages from 2.5V to 5.5V across an operating temperature range of 0°C to 70°C. The part is ROHS3 compliant and actively produced. Equivalent and substitute parts are identified based on matching memory capacity, I2C interface protocol, memory organization, and compatible packaging specifications.

Key Parameters

Parameter	24LC32A/SM
Memory Size	32Kbit
Memory Format	EEPROM
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	0°C ~ 70°C
Package / Case	8-SOIC (0.209", 5.30mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 24LC32A/SM are grouped based on the following substitution criteria:

Primary Substitution Parameters:

Memory Size: 32Kbit (exact match required)
Memory Format: EEPROM (exact match required)
Memory Organization: 4K x 8 (exact match required)
Memory Interface: I2C (exact match required)
Write Cycle Time: 5ms (exact match required)
Package Type: 8-SOIC or 8-SOIJ (mechanically compatible)
Mounting Type: Surface Mount (exact match required)

Secondary Compatibility Parameters:

Clock Frequency: 400 kHz minimum (higher frequencies are backward compatible)
Access Time: 900 ns or faster (faster access times are compatible)
Voltage Supply Range: Must encompass or exceed 2.5V ~ 5.5V
Operating Temperature: Extended ranges are compatible with the base specification
RoHS Compliance: ROHS3 Compliant (required for new designs)

Substitutes are divided into two categories: direct equivalents (identical specifications) and functional equivalents (enhanced specifications that maintain full backward compatibility).

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temp	Package	Packaging Type	Product Status
24LC32A/SM	Microchip Technology	32Kbit	400 kHz	900 ns	2.5V ~ 5.5V	0°C ~ 70°C	8-SOIJ	Tube	Active
24LC32AT/SM	Microchip Technology	32Kbit	400 kHz	900 ns	2.5V ~ 5.5V	0°C ~ 70°C	8-SOIJ	Tape & Reel	Active
24AA32A-I/SM	Microchip Technology	32Kbit	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIJ	Tube	Active
24LC32A-I/SM	Microchip Technology	32Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIJ	Tube	Active
BR24G32F-3GTE2	Rohm Semiconductor	32Kbit	400 kHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-SOP (0.173", 4.40mm)	Tape & Reel	Active
BR24T32F-WE2	Rohm Semiconductor	32Kbit	400 kHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-SOP (0.173", 4.40mm)	Tape & Reel	Active
M24C32-DFMN6TP	STMicroelectronics	32Kbit	1 MHz	450 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC (0.154", 3.90mm)	Cut Tape & Digi-Reel	Active
M24C32-RMN6P	STMicroelectronics	32Kbit	1 MHz	450 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC (0.154", 3.90mm)	Bulk	Active
M24C32-RMN6TP	STMicroelectronics	32Kbit	1 MHz	450 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC (0.154", 3.90mm)	Cut Tape & Digi-Reel	Active
M24C32-WMN6P	STMicroelectronics	32Kbit	1 MHz	450 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC (0.154", 3.90mm)	Tube	Not For New Designs
M24C32-WMN6TP	STMicroelectronics	32Kbit	1 MHz	450 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC (0.154", 3.90mm)	Cut Tape & Digi-Reel	Not For New Designs

Engineering Selection Recommendations

Direct Equivalents (Microchip Technology):

24LC32AT/SM and 24LC32A-I/SM are direct functional equivalents to 24LC32A/SM. The 24LC32AT/SM differs only in packaging format (Tape & Reel versus Tube) and maintains identical electrical specifications. The 24LC32A-I/SM extends the operating temperature range to -40°C ~ 85°C while maintaining the same voltage supply range and all other parameters.

24AA32A-I/SM is a Microchip equivalent with extended voltage supply range (1.8V ~ 5.5V) and extended operating temperature range (-40°C ~ 85°C), providing enhanced environmental performance while maintaining identical memory specifications and I2C interface characteristics.

Enhanced Equivalents (STMicroelectronics M24C32 Series):

M24C32-DFMN6TP, M24C32-RMN6TP, and M24C32-RMN6P offer enhanced I2C clock frequency (1 MHz versus 400 kHz) and faster access time (450 ns versus 900 ns). These parts maintain 32Kbit capacity, 4K x 8 organization, and 5ms write cycle time. The M24C32-DFMN6TP is actively produced and verified for programmability. M24C32-RMN6TP provides the highest inventory availability (42,900 pcs). M24C32-WMN6P and M24C32-WMN6TP are marked "Not For New Designs" and should not be selected for new applications.

Alternative Equivalents (Rohm Semiconductor BR24 Series):

BR24G32F-3GTE2 and BR24T32F-WE2 are Rohm Semiconductor alternatives with 32Kbit capacity and 400 kHz I2C operation. These parts feature extended voltage supply range (1.6V ~ 5.5V) and extended operating temperature range (-40°C ~ 85°C). Package dimensions differ (8-SOP 0.173" width versus 8-SOIJ 0.209" width), requiring PCB layout verification for mechanical compatibility.

All recommended substitutes maintain ROHS3 compliance and are actively produced. Selection should prioritize parts with "Active" product status for new designs.

Frequently Asked Questions (FAQ)

Q: Can I substitute 24LC32A/SM with 24LC32AT/SM?

A: Yes. Both parts are identical in electrical specifications. The only difference is packaging format: 24LC32AT/SM is supplied in Tape & Reel format while 24LC32A/SM is supplied in Tube format. Electrical performance and pinout are identical.

Q: What is the difference between 24LC32A/SM and 24AA32A-I/SM?

A: Both are 32Kbit I2C EEPROMs with identical memory organization and interface specifications. The 24AA32A-I/SM has a lower minimum supply voltage (1.8V versus 2.5V) and extended operating temperature range (-40°C to 85°C versus 0°C to 70°C). The 24AA32A-I/SM is suitable for applications requiring lower voltage operation or wider temperature performance.

Q: Can I use M24C32-DFMN6TP as a direct replacement for 24LC32A/SM?

A: Yes, with design considerations. The M24C32-DFMN6TP is functionally compatible with enhanced performance: 1 MHz I2C clock frequency (versus 400 kHz) and 450 ns access time (versus 900 ns). All memory specifications match. However, the package is 8-SOIC with 0.154" width versus 8-SOIJ with 0.209" width. PCB footprint verification is required before substitution.

Q: Are Rohm BR24G32F-3GTE2 and BR24T32F-WE2 compatible with 24LC32A/SM?

A: Both Rohm parts are functionally compatible with identical 32Kbit capacity and 400 kHz I2C operation. Package dimensions differ (8-SOP 0.173" width versus 8-SOIJ 0.209" width), requiring PCB layout verification. Both parts support extended voltage range (1.6V minimum) and extended temperature range (-40°C to 85°C).

Q: Why are M24C32-WMN6P and M24C32-WMN6TP marked "Not For New Designs"?

A: These parts are legacy products from STMicroelectronics. While functionally compatible with 24LC32A/SM, they are not recommended for new design implementations. Active alternatives include M24C32-DFMN6TP, M24C32-RMN6TP, and M24C32-RMN6P.

Q: What packaging options are available for 32Kbit I2C EEPROM substitutes?

A: Microchip 24LC32A variants are available in Tube and Tape & Reel packaging in 8-SOIJ format. STMicroelectronics M24C32 variants are available in Tube, Tape & Reel, Cut Tape & Digi-Reel, and Bulk packaging in 8-SOIC format. Rohm BR24 variants are available in Tape & Reel packaging in 8-SOP format. Packaging selection depends on production volume and assembly requirements.

Q: Which substitute offers the best performance improvement over 24LC32A/SM?

A: M24C32-DFMN6TP, M24C32-RMN6TP, and M24C32-RMN6P offer the highest performance with 1 MHz I2C clock frequency and 450 ns access time, compared to 24LC32A/SM at 400 kHz and 900 ns. These parts are fully backward compatible and actively produced.

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