AT24C32C-TH-B Equivalent & Substitute Parts

Part Overview

The AT24C32C-TH-B 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-TSSOP surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Suitable alternatives must maintain compatibility across memory capacity, interface protocol, package form factor, and electrical operating parameters.

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	5ms
Voltage Supply Range	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the AT24C32C-TH-B is determined by the following critical parameters:

Primary Compatibility Criteria:

Memory capacity: 32Kbit (4K x 8 organization)
Interface protocol: I2C
Package type: 8-TSSOP surface mount
Supply voltage range: Must encompass or overlap with 1.8V ~ 5.5V
Operating temperature range: Must support -40°C ~ 85°C minimum

Secondary Performance Criteria:

Clock frequency: 1 MHz (primary part specification)
Access time: 550 ns (primary part specification)
Write cycle time: 5ms (standard across all candidates)

Substitute parts are grouped into two categories based on clock frequency capability:

Category A - 1 MHz I2C Speed: Parts meeting the full 1 MHz specification of the original part, maintaining identical performance characteristics.

Category B - 400 kHz I2C Speed: Parts operating at reduced I2C clock frequency (400 kHz) with slower access times (900 ns). These are functionally compatible in applications where reduced speed is acceptable, as I2C protocol remains unchanged and memory capacity is identical.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temp	Package	Product Status
AT24C32C-TH-B	Microchip Technology	32Kbit	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Obsolete
AT24CS32-XHM-T	Microchip Technology	32Kbit	1 MHz	550 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
CAT24C32YI-G	onsemi	32Kbit	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
BR24G32FVT-3AGE2	Rohm Semiconductor	32Kbit	1 MHz	Not specified	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
24AA32AF-I/ST	Microchip Technology	32Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA32A-I/ST	Microchip Technology	32Kbit	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA32AX-I/ST	Microchip Technology	32Kbit	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
24AA32AXT-I/ST	Microchip Technology	32Kbit	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
BR24G32FVT-3GE2	Rohm Semiconductor	32Kbit	400 kHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
BR24L32FVT-WE2	Rohm Semiconductor	32Kbit	400 kHz	Not specified	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
BR24S32FVT-WE2	Rohm Semiconductor	32Kbit	400 kHz	Not specified	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active

Engineering Selection Recommendations

Direct Replacement (1 MHz Performance Tier):

AT24CS32-XHM-T is the primary active equivalent from Microchip Technology, maintaining identical 1 MHz I2C clock frequency and 550 ns access time. This part carries active product status and ROHS3 compliance. Supply voltage range extends to 1.7V minimum, providing broader low-voltage compatibility than the original part.

CAT24C32YI-G from onsemi provides 1 MHz I2C operation with improved 400 ns access time, exceeding original performance specifications. Active product status and ROHS3 compliance are confirmed.

BR24G32FVT-3AGE2 from Rohm Semiconductor operates at 1 MHz I2C frequency in 8-TSSOP-B package variant. Active product status and ROHS3 compliance are confirmed.

Functional Equivalent (400 kHz Performance Tier):

24AA32A-I/ST and 24AA32AF-I/ST from Microchip Technology provide 32Kbit I2C EEPROM functionality at 400 kHz clock frequency with 900 ns access time. Both maintain active product status and ROHS3 compliance. These parts are suitable for applications where I2C bus speed reduction is acceptable.

24AA32AX-I/ST and 24AA32AXT-I/ST extend operating temperature range to -40°C ~ 125°C while maintaining 400 kHz I2C operation. These variants support extended temperature applications.

BR24L32FVT-WE2 and BR24S32FVT-WE2 from Rohm Semiconductor provide 400 kHz I2C operation in 8-TSSOP-B package. BR24L32FVT-WE2 is verified as DiGi-Electronics programmable. Both maintain ROHS3 compliance and active product status.

Frequently Asked Questions (FAQ)

Q: Can I use a 400 kHz I2C part as a direct replacement for the 1 MHz AT24C32C-TH-B?

A: Yes, functionally. The 400 kHz parts (24AA32A-I/ST, BR24L32FVT-WE2, etc.) maintain identical memory capacity, organization, and I2C protocol. I2C is backward compatible at reduced clock speeds. The system I2C bus will operate at the lower speed supported by all connected devices. This substitution is valid if your application does not require 1 MHz bus performance.

Q: What is the difference between 8-TSSOP and 8-TSSOP-B packages?

A: Both are 8-pin thin shrink small outline packages with identical 0.173" width and 4.40mm dimensions. The -B designation indicates a package variant from Rohm Semiconductor. Pin configuration and footprint compatibility are maintained. PCB layout and assembly processes remain unchanged.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the original AT24C32C-TH-B specification.

Q: Which substitute part has the best availability?

A: BR24G32FVT-3AGE2 from Rohm Semiconductor shows the highest inventory level at 50,300 pieces in stock, with active product status and 1 MHz I2C performance matching the original part.

Q: Can I use parts with extended temperature range (-40°C ~ 125°C) in standard applications?

A: Yes. Extended temperature range parts (24AA32AX-I/ST, 24AA32AXT-I/ST) are fully compatible in standard -40°C ~ 85°C applications. The extended range provides additional design margin and future flexibility without performance penalty.

Q: What is the minimum supply voltage for each substitute?

A: AT24CS32-XHM-T and CAT24C32YI-G support 1.7V minimum. 24AA32AF-I/ST and BR24S32FVT-WE2 support 1.7V minimum. 24AA32A-I/ST, 24AA32AX-I/ST, 24AA32AXT-I/ST, and BR24L32FVT-WE2 support 1.8V minimum. BR24G32FVT-3GE2 supports 1.6V minimum. Verify your system's minimum supply voltage against the selected part's specification.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message