AT24C32CN-SH-T EEPROM 32Kbit I2C Memory - Equivalent & Substitute Parts

Part Overview

The AT24C32CN-SH-T is a 32Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface with 1 MHz clock frequency and 550 ns access time in an 8-SOIC package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts maintain the core functional parameters: 32Kbit capacity, I2C interface, 4K x 8 memory organization, and compatible operating temperature range of -40°C to 85°C.

Key Parameters

Parameter	Value
Memory Size	32Kbit
Memory Organization	4K x 8
Memory Interface	I2C
Clock Frequency	1 MHz
Access Time	550 ns
Write Cycle Time	5 ms
Voltage Supply Range	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Compatibility Requirements:

Memory Size: 32Kbit (exact match required)
Memory Organization: 4K x 8 (exact match required)
Memory Interface: I2C (exact match required)
Package / Case: 8-SOIC with 0.154" (3.90mm) width (exact match required for direct PCB compatibility)
Operating Temperature: -40°C ~ 85°C (exact match required)
Mounting Type: Surface Mount (exact match required)

Secondary Compatibility Parameters:

Clock Frequency: 1 MHz (primary part specification; 400 kHz alternatives are functionally compatible but operate at reduced speed)
Access Time: 550 ns (primary part specification; 900 ns alternatives are functionally compatible but with increased latency)
Voltage Supply Range: Must encompass or match the primary part range (1.8V ~ 5.5V)
RoHS Status: ROHS3 Compliant (required for regulatory compliance)

Substitute parts are grouped into two categories:

Category A - Direct Equivalents (1 MHz, 550 ns): Parts maintaining identical clock frequency and access time specifications. These provide drop-in replacement capability with no performance degradation.

Category B - Functional Equivalents (400 kHz, 900 ns): Parts with reduced clock frequency and increased access time. These maintain full functional compatibility and memory capacity but operate at lower speed performance. Suitable for applications where the reduced speed does not impact system requirements.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Package	Product Status
AT24C32CN-SH-T	Microchip Technology	32Kbit	1 MHz	550 ns	1.8V ~ 5.5V	8-SOIC (3.90mm)	Obsolete
AT24CS32-SSHM-T	Microchip Technology	32Kbit	1 MHz	550 ns	1.7V ~ 5.5V	8-SOIC (3.90mm)	Active
BR24G32FJ-3AGTE2	Rohm Semiconductor	32Kbit	1 MHz	Not specified	1.7V ~ 5.5V	8-SOP-J (3.90mm)	Active
24AA32AF-I/SN	Microchip Technology	32Kbit	400 kHz	900 ns	1.7V ~ 5.5V	8-SOIC (3.90mm)	Active
24AA32AFT-I/SN	Microchip Technology	32Kbit	400 kHz	900 ns	1.7V ~ 5.5V	8-SOIC (3.90mm)	Active
24AA32AT-I/SN	Microchip Technology	32Kbit	400 kHz	900 ns	1.8V ~ 5.5V	8-SOIC (3.90mm)	Active
BR24G32FJ-3GTE2	Rohm Semiconductor	32Kbit	400 kHz	Not specified	1.6V ~ 5.5V	8-SOP-J (3.90mm)	Active
BR24L32FJ-WE2	Rohm Semiconductor	32Kbit	400 kHz	Not specified	1.8V ~ 5.5V	8-SOP-J (3.90mm)	Active
BR24S32FJ-WE2	Rohm Semiconductor	32Kbit	400 kHz	Not specified	1.7V ~ 5.5V	8-SOP-J (3.90mm)	Active
24AA64-I/SM	Microchip Technology	64Kbit	400 kHz	900 ns	1.7V ~ 5.5V	8-SOIJ (5.30mm)	Active

Engineering Selection Recommendations

Direct Replacement (Preferred for Obsolete Part Mitigation):

AT24CS32-SSHM-T is the primary recommended substitute. This part maintains identical electrical specifications (1 MHz clock frequency, 550 ns access time, 32Kbit capacity, I2C interface) and package dimensions (8-SOIC, 3.90mm width). It is manufactured by Microchip Technology with Active product status and ROHS3 compliance. Inventory availability is 3,400 units.

Alternative Substitutes with Reduced Performance (400 kHz Operation):

The following parts are functionally compatible but operate at 400 kHz clock frequency instead of 1 MHz:

24AA32AT-I/SN (Microchip Technology, Active status, 16,202 units in stock)
24AA32AFT-I/SN (Microchip Technology, Active status, 15,200 units in stock)
24AA32AF-I/SN (Microchip Technology, Active status, 3,052 units in stock)
BR24G32FJ-3GTE2 (Rohm Semiconductor, Active status, 105,400 units in stock)
BR24L32FJ-WE2 (Rohm Semiconductor, Active status, 7,159 units in stock)
BR24S32FJ-WE2 (Rohm Semiconductor, Active status, 971 units in stock)

All recommended substitutes maintain ROHS3 compliance and the required operating temperature range of -40°C to 85°C. Selection among alternatives should be based on supply chain availability, voltage supply range requirements, and system tolerance for reduced clock frequency operation.

Not Recommended:

24AA64-I/SM is not suitable as a direct substitute. Although it maintains I2C interface and compatible operating temperature, it features 64Kbit capacity (8K x 8 organization) and an 8-SOIJ package with 5.30mm width, which differs from the required 8-SOIC 3.90mm package. This part is suitable only for applications requiring increased memory capacity with PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can I use a 400 kHz substitute part in place of the 1 MHz AT24C32CN-SH-T?

A: Yes, 400 kHz parts are functionally compatible. The reduced clock frequency does not affect memory capacity, data integrity, or I2C protocol compliance. However, data transfer rates will be lower. Confirm that your system design does not require the higher 1 MHz speed before substitution.

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

A: Both packages are 8-pin surface mount configurations with identical 3.90mm width and pin spacing. They are mechanically and electrically compatible for PCB mounting. The designations reflect different manufacturer naming conventions (SOIC = Small Outline Integrated Circuit; SOP-J = Small Outline Package with J-lead).

Q: Are Rohm Semiconductor parts (BR24 series) compatible with Microchip Technology designs?

A: Yes. Both manufacturers produce I2C EEPROM devices with identical electrical specifications, memory organization, and package dimensions. They are pin-compatible and functionally interchangeable when memory size, clock frequency, and package specifications match.

Q: Why is the 24AA64-I/SM not recommended as a substitute?

A: The 24AA64-I/SM has 64Kbit capacity instead of 32Kbit and uses an 8-SOIJ package with 5.30mm width instead of 8-SOIC with 3.90mm width. These differences require PCB redesign and are not suitable for direct substitution. It is only applicable for applications requiring increased memory capacity.

Q: What does "Active" product status mean compared to "Obsolete"?

A: Active status indicates the part is currently manufactured and supported by the supplier with ongoing availability. Obsolete status indicates the part is no longer manufactured. Substituting an obsolete part with an active equivalent ensures long-term supply chain continuity and design support.

Q: Do all substitute parts have the same voltage supply range?

A: No. The primary part (AT24C32CN-SH-T) specifies 1.8V ~ 5.5V. Some substitutes specify 1.7V ~ 5.5V or 1.6V ~ 5.5V. Confirm that your system voltage supply falls within the specified range of your selected substitute part.

Q: Is moisture sensitivity a factor in selecting a substitute?

A: The primary part specifies MSL 1 (Unlimited). AT24CS32-SSHM-T specifies MSL 3 (168 Hours), indicating stricter moisture handling requirements during storage and assembly. Confirm that your manufacturing process accommodates the moisture sensitivity level of your selected substitute.

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