24AA32A/SM EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24AA32A/SM is a 32Kbit I2C EEPROM memory IC manufactured by Microchip Technology, packaged in 8-SOIJ surface mount configuration. This non-volatile memory device operates at 400 kHz I2C clock frequency with 900 ns access time and supports supply voltages from 1.8V to 5.5V across the industrial temperature range (0°C to 70°C). The part is ROHS3 compliant and actively produced. Equivalent and substitute parts are identified based on matching core memory specifications, electrical parameters, and mechanical compatibility within the 32Kbit I2C EEPROM category.

Key Parameters

Parameter	24AA32A/SM
Memory Size	32Kbit
Memory Format	EEPROM
Memory Organization	4K x 8
Interface	I2C
Clock Frequency	400 kHz
Access Time	900 ns
Write Cycle Time	5ms
Supply Voltage Range	1.8V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	8-SOIC (0.209", 5.30mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 24AA32A/SM are qualified based on the following core parameters:

Memory capacity: 32Kbit
Memory format: EEPROM non-volatile technology
Memory organization: 4K x 8 bit structure
Interface protocol: I2C serial communication
Write cycle time: 5ms (word/page)
Package category: 8-pin SOIC/SOIJ surface mount
Compliance: ROHS3 and REACH unaffected status

Substitutes are grouped into two categories: direct pin-compatible alternatives with identical or superior electrical performance, and functionally equivalent parts with minor package dimension variations that do not affect PCB layout compatibility. All substitutes maintain the same memory capacity, organization, and I2C interface protocol. Variations in clock frequency (400 kHz vs. 1 MHz), access time (900 ns vs. 450 ns), supply voltage range, and operating temperature range are noted as they may affect system performance and environmental suitability.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Supply Voltage	Operating Temperature	Package / Case	Product Status	Inventory
24AA32A/SM	Microchip Technology	32Kbit	400 kHz	900 ns	1.8V ~ 5.5V	0°C ~ 70°C	8-SOIC (0.209", 5.30mm)	Active	1030 Pcs
24AA32A-I/SM	Microchip Technology	32Kbit	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC (0.209", 5.30mm)	Active	2452 Pcs
BR24G32F-3GTE2	Rohm Semiconductor	32Kbit	400 kHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-SOIC (0.173", 4.40mm)	Active	3383 Pcs
CAV24C32WE-GT3	onsemi	32Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC (0.154", 3.90mm)	Active	6230 Pcs
M24C32-DFMN6TP	STMicroelectronics	32Kbit	1 MHz	450 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC (0.154", 3.90mm)	Active	8026 Pcs
M24C32-RMN6P	STMicroelectronics	32Kbit	1 MHz	450 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC (0.154", 3.90mm)	Active	2100 Pcs
M24C32-RMN6TP	STMicroelectronics	32Kbit	1 MHz	450 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC (0.154", 3.90mm)	Active	42900 Pcs
M24C32-WMN6P	STMicroelectronics	32Kbit	1 MHz	450 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC (0.154", 3.90mm)	Not For New Designs	15856 Pcs
M24C32-WMN6TP	STMicroelectronics	32Kbit	1 MHz	450 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC (0.154", 3.90mm)	Not For New Designs	40198 Pcs

Engineering Selection Recommendations

Primary Substitute (Recommended for New Designs): 24AA32A-I/SM from Microchip Technology is the direct equivalent with identical electrical specifications and extended operating temperature range (-40°C to 85°C). This part maintains the same 400 kHz I2C clock frequency, 900 ns access time, and supply voltage compatibility. Active product status and higher inventory availability (2452 Pcs) support production continuity.

Secondary Substitutes (Active Status, Extended Temperature Range): M24C32-DFMN6TP, M24C32-RMN6P, and M24C32-RMN6TP from STMicroelectronics provide enhanced I2C clock frequency (1 MHz) and faster access time (450 ns), enabling higher-speed system operation. These parts support the extended industrial temperature range (-40°C to 85°C) and maintain ROHS3 compliance. Package dimensions differ (0.154" vs. 0.209" width), requiring PCB layout verification. M24C32-RMN6TP offers the highest inventory (42900 Pcs).

Automotive-Grade Alternative: CAV24C32WE-GT3 from onsemi is AEC-Q100 qualified for automotive applications with extended temperature range (-40°C to 125°C). This part maintains 400 kHz I2C operation and 900 ns access time. Supply voltage minimum is 2.5V, which may limit low-voltage applications. Package width is 0.154" (3.90mm).

Legacy Parts (Not For New Designs): M24C32-WMN6P and M24C32-WMN6TP from STMicroelectronics are marked "Not For New Designs" and should not be selected for new product development, though they remain available for legacy system support.

Rohm Alternative: BR24G32F-3GTE2 from Rohm Semiconductor provides 32Kbit I2C EEPROM functionality with extended temperature range (-40°C to 85°C) and lower minimum supply voltage (1.6V). Access time is not specified. Package width is 0.173" (4.40mm).

Frequently Asked Questions (FAQ)

Q: Can 24AA32A-I/SM directly replace 24AA32A/SM? A: Yes. Both parts are Microchip Technology 32Kbit I2C EEPROMs with identical electrical specifications (400 kHz, 900 ns access time, 1.8V–5.5V supply). The -I/SM variant extends operating temperature to -40°C to 85°C, providing broader environmental coverage. Pin configuration and package footprint are identical.

Q: What are the key differences between 400 kHz and 1 MHz I2C clock frequency options? A: The 24AA32A/SM operates at 400 kHz standard I2C speed, while M24C32 variants from STMicroelectronics support 1 MHz fast I2C mode. The 1 MHz variants also provide faster access time (450 ns vs. 900 ns). System I2C bus design must support the higher frequency; not all controllers or bus topologies are compatible with 1 MHz operation. Existing 400 kHz designs require no changes with 400 kHz substitutes.

Q: Are package dimension differences critical for PCB compatibility? A: Package width varies across substitutes: 24AA32A/SM uses 0.209" (5.30mm), while M24C32 variants use 0.154" (3.90mm), and BR24G32F-3GTE2 uses 0.173" (4.40mm). All are 8-pin SOIC surface mount packages with identical pin pitch (0.050"). Smaller packages fit existing footprints without layout modification, but larger packages require PCB redesign. Verify footprint compatibility before selection.

Q: What supply voltage range should I consider for low-power applications? A: The 24AA32A/SM supports 1.8V minimum supply voltage, enabling operation in battery-powered systems. BR24G32F-3GTE2 extends this to 1.6V minimum. M24C32-DFMN6TP supports 1.7V minimum. CAV24C32WE-GT3 and M24C32-WMN variants require 2.5V minimum, limiting use in ultra-low-voltage designs.

Q: Which substitute is best for automotive applications? A: CAV24C32WE-GT3 from onsemi is AEC-Q100 qualified for automotive use with extended temperature range (-40°C to 125°C). This part meets automotive reliability and qualification standards. Other substitutes are industrial-grade and not automotive-qualified.

Q: Can I use M24C32 parts in existing 24AA32A designs without firmware changes? A: Yes. All substitutes maintain identical memory capacity (32Kbit), organization (4K x 8), and I2C protocol. Firmware requires no modification. However, M24C32 variants support higher I2C clock frequencies (1 MHz) and faster access times (450 ns). Existing firmware designed for 400 kHz operation will function correctly at the lower speed; no performance degradation occurs.

Q: What is the significance of "Not For New Designs" status? A: M24C32-WMN6P and M24C32-WMN6TP are marked "Not For New Designs" by STMicroelectronics, indicating these parts are in mature/legacy phase. Manufacturers may discontinue these parts with limited notice. New product designs should select active-status alternatives (M24C32-DFMN6TP, M24C32-RMN6TP) to ensure long-term supply availability and support.

Q: How do I verify I2C bus compatibility with higher-frequency substitutes? A: I2C bus speed is determined by the slowest device and pull-up resistor values. Substituting a 1 MHz-capable part into a 400 kHz bus operates at 400 kHz without issues. To utilize 1 MHz capability, verify all bus devices (microcontroller, other ICs, pull-up resistors) support fast I2C mode. Bus capacitance must remain below specified limits for reliable 1 MHz operation.

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