24AA32A/SN EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24AA32A/SN is a 32Kbit I2C EEPROM memory IC manufactured by Microchip Technology in an 8-SOIC package. This part is classified as obsolete and operates across a supply voltage range of 1.8V to 5.5V with an operating temperature range of 0°C to 70°C. The device features a 400 kHz I2C interface, 900 ns access time, and 5ms write cycle time. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for new designs and ongoing production 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	1.8V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	8-SOIC
Mounting Type	Surface Mount
RoHS Status	Non-compliant

Substitute Part Grouping Explanation

Substitution for the 24AA32A/SN is determined by the following critical parameters:

Memory Capacity: 32Kbit with 4K x 8 organization
Interface Protocol: I2C communication standard
Package Compatibility: 8-SOIC form factor (0.154" width, 3.90mm)
Electrical Specifications: Supply voltage range and operating temperature envelope
Functional Equivalence: Non-volatile EEPROM technology with identical memory organization

Substitute parts must maintain compatibility across these parameters. Parts are grouped into two categories: direct equivalents from the same manufacturer (Microchip Technology) with improved specifications, and cross-manufacturer alternatives (Rohm Semiconductor, onsemi) that meet or exceed the original electrical and mechanical requirements.

Parameter Comparison

Part Number	Manufacturer	Memory Size	I2C Clock	Access Time	Voltage Range	Temp Range	Package	Status	RoHS
24AA32A/SN	Microchip	32Kbit	400 kHz	900 ns	1.8V ~ 5.5V	0°C ~ 70°C	8-SOIC	Obsolete	Non-compliant
24AA32A-I/SN	Microchip	32Kbit	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
AT24C32D-SSPD-T	Microchip	32Kbit	1 MHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Active	ROHS3 Compliant
BR24G32FJ-3GTE2	Rohm	32Kbit	400 kHz	N/A	1.6V ~ 5.5V	-40°C ~ 85°C	8-SOP-J	Active	ROHS3 Compliant
BR24L32FJ-WE2	Rohm	32Kbit	400 kHz	N/A	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOP-J	Active	ROHS3 Compliant
BR24S32FJ-WE2	Rohm	32Kbit	400 kHz	N/A	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOP-J	Active	ROHS3 Compliant
BR24T32FJ-WE2	Rohm	32Kbit	400 kHz	N/A	1.6V ~ 5.5V	-40°C ~ 85°C	8-SOP-J	Active	ROHS3 Compliant
CAT24C32WI-GT3	onsemi	32Kbit	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: 24AA32A-I/SN

The 24AA32A-I/SN is the direct successor from Microchip Technology. It maintains identical electrical and memory specifications to the 24AA32A/SN while offering an extended operating temperature range (-40°C to 85°C) and ROHS3 compliance. This part is currently in active production status with high inventory availability (66,200 units). Pin-to-pin compatibility and identical package dimensions (8-SOIC, 0.154" width) ensure direct substitution without design modifications.

Secondary Recommendation: CAT24C32WI-GT3

The CAT24C32WI-GT3 from onsemi provides enhanced performance with 1 MHz I2C clock frequency and 400 ns access time, compared to the original 400 kHz and 900 ns specifications. The device maintains 8-SOIC packaging and operates across 1.7V to 5.5V supply range. This part is suitable for applications requiring faster I2C communication while maintaining backward compatibility with existing I2C bus implementations.

Alternative Options: Rohm Semiconductor BR24 Series

The BR24G32FJ-3GTE2, BR24L32FJ-WE2, BR24S32FJ-WE2, and BR24T32FJ-WE2 from Rohm Semiconductor offer 32Kbit I2C EEPROM functionality in 8-SOP-J packaging. These parts maintain 400 kHz I2C operation and 5ms write cycle time. The BR24L32FJ-WE2 and BR24S32FJ-WE2 are verified as programmable by DiGi-Electronics. Supply voltage ranges vary between 1.6V and 1.8V minimum thresholds, with all parts supporting up to 5.5V. All Rohm alternatives are ROHS3 compliant and in active production.

Frequently Asked Questions (FAQ)

Q: Can the 24AA32A-I/SN directly replace the 24AA32A/SN without PCB modifications?

A: Yes. The 24AA32A-I/SN is pin-compatible and maintains identical package dimensions (8-SOIC, 0.154" width, 3.90mm). No PCB layout changes are required. The extended temperature range and ROHS3 compliance represent improvements over the original part.

Q: What is the difference between 8-SOIC and 8-SOP-J packaging?

A: Both are 8-pin surface mount packages with similar footprints. The 8-SOIC (Small Outline Integrated Circuit) and 8-SOP-J (Small Outline Package-J) are mechanically compatible in most applications. The primary difference is package width: 8-SOIC measures 0.154" (3.90mm) while 8-SOP variants measure 0.173" (4.40mm). Verify PCB footprint compatibility before substitution.

Q: Is the AT24C32D-SSPD-T suitable for applications requiring 400 kHz I2C operation?

A: Yes. The AT24C32D-SSPD-T operates at 1 MHz I2C clock frequency, which is backward compatible with 400 kHz I2C bus implementations. The device will operate correctly on slower I2C buses. However, the minimum supply voltage is 2.5V compared to the original 1.8V, which may affect low-voltage applications.

Q: Which substitute parts are verified as programmable by DiGi-Electronics?

A: The 24AA32A-I/SN and BR24L32FJ-WE2 are verified as programmable. The AT24C32D-SSPD-T, BR24G32FJ-3GTE2, BR24T32F-WE2, BR24T32FJ-WE2, and CAT24C32WI-GT3 are not verified by DiGi-Electronics.

Q: What is the inventory status of available substitutes?

A: The 24AA32A-I/SN has the highest inventory at 66,200 units. CAT24C32WI-GT3 has 87,800 units available. Rohm Semiconductor parts range from 971 to 105,400 units depending on specific variant. The AT24C32D-SSPD-T has 12,786 units in stock.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts are ROHS3 compliant. The original 24AA32A/SN is RoHS non-compliant, making substitution necessary for applications requiring RoHS compliance.

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