24LC32AT-E/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24LC32AT-E/ST is a 32Kbit I2C EEPROM memory IC manufactured by Microchip Technology, supplied in Tape & Reel packaging with 8-TSSOP 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 2.5V to 5.5V across an operating temperature range of -40°C to 125°C. The part is ROHS3 compliant and currently in active product status. Equivalent and substitute parts are identified based on matching memory capacity, interface protocol, package type, and electrical operating parameters to ensure direct functional replacement in circuit designs.

Key Parameters

Parameter	24LC32AT-E/ST
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	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
Package Type	8-TSSOP
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 24LC32AT-E/ST are grouped based on the following critical parameters that determine functional compatibility:

Primary Matching Criteria:

Memory Size: 32Kbit (mandatory)
Memory Organization: 4K x 8 (mandatory)
Memory Interface: I2C (mandatory)
Package Type: 8-TSSOP or equivalent surface mount packages (8-MSOP, 8-SSOP-B, 8-TSSOP-B acceptable)
Write Cycle Time: 5ms (mandatory)
RoHS Compliance: ROHS3 (mandatory)

Secondary Compatibility Parameters:

Clock Frequency: 400 kHz or higher (1 MHz variants are backward compatible)
Access Time: 900 ns or faster
Voltage Supply Range: Must encompass or exceed 2.5V ~ 5.5V minimum requirement
Operating Temperature: Must support -40°C minimum; upper limit may vary

Substitutes are classified into two categories: direct equivalents (identical packaging and electrical specifications) and functional alternatives (different package variants or enhanced specifications that maintain circuit compatibility).

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temp	Package Type	Product Status
24LC32AT-E/ST	Microchip Technology	32Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
24LC32A-E/ST	Microchip Technology	32Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
BR24G32FVM-3AGTTR	Rohm Semiconductor	32Kbit	1 MHz	Not specified	1.7V ~ 5.5V	-40°C ~ 85°C	8-MSOP	Active
BR24G32FVT-3AGE2	Rohm Semiconductor	32Kbit	1 MHz	Not specified	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
BR24G32FVT-3GE2	Rohm Semiconductor	32Kbit	400 kHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
BR24L32FV-WE2	Rohm Semiconductor	32Kbit	400 kHz	Not specified	1.8V ~ 5.5V	-40°C ~ 85°C	8-SSOP-B	Not For New Designs
BR24L32FVT-WE2	Rohm Semiconductor	32Kbit	400 kHz	Not specified	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
BR24T32FVM-WTR	Rohm Semiconductor	32Kbit	400 kHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-MSOP	Active
CAT24C32YI-G	onsemi	32Kbit	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
CAT24C32YI-GT3	onsemi	32Kbit	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
M24C32-DFDW6TP	STMicroelectronics	32Kbit	1 MHz	450 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active

Engineering Selection Recommendations

Direct Equivalent (Preferred for Drop-In Replacement):

24LC32A-E/ST is the direct equivalent to 24LC32AT-E/ST, both from Microchip Technology. This part maintains identical electrical specifications, memory organization, clock frequency, access time, and operating temperature range. The only difference is packaging format (Tube versus Tape & Reel). This part is in active product status and suitable for new designs.

Functional Alternatives with Enhanced Specifications:

CAT24C32YI-GT3 (onsemi) and M24C32-DFDW6TP (STMicroelectronics) offer higher clock frequency (1 MHz) and faster access times (400 ns and 450 ns respectively) while maintaining 8-TSSOP package compatibility. Both are in active product status and ROHS3 compliant. These parts are suitable for applications requiring higher I2C bus speeds.

Rohm Semiconductor Alternatives:

BR24G32FVT-3GE2 and BR24L32FVT-WE2 provide 400 kHz clock frequency matching the main part specification. BR24G32FVT-3GE2 is in active status with 1.6V minimum supply voltage. BR24L32FVT-WE2 is in active status with 1.8V minimum supply voltage. Both use 8-TSSOP-B package variant. BR24L32FV-WE2 is marked "Not For New Designs" and should not be selected for new circuit development.

Package Variant Considerations:

BR24G32FVM-3AGTTR and BR24T32FVM-WTR use 8-MSOP package (0.110" width) instead of 8-TSSOP (0.173" width). These are physically smaller and require PCB layout modifications. Both are in active status and support 400 kHz operation.

All recommended substitutes maintain ROHS3 compliance and MSL Level 1 moisture sensitivity rating.

Frequently Asked Questions (FAQ)

Q: Can I use CAT24C32YI-GT3 as a direct replacement for 24LC32AT-E/ST?

A: Yes. CAT24C32YI-GT3 is functionally compatible. Both devices support I2C interface, 32Kbit memory capacity, 4K x 8 organization, and 8-TSSOP package. The CAT24C32YI-GT3 operates at 1 MHz clock frequency (versus 400 kHz) and has 400 ns access time (versus 900 ns), representing enhanced performance specifications. Operating temperature range is -40°C to 85°C (versus -125°C), which is acceptable for most applications. Voltage supply range is 1.7V to 5.5V, which encompasses the 2.5V to 5.5V requirement.

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

A: Both are surface mount packages with 8 pins. The 8-TSSOP package has a body width of 0.173" (4.40mm), while 8-MSOP has a body width of 0.110" (2.80mm). The 8-MSOP is physically smaller and requires different PCB footprint design. Pin pitch and electrical characteristics are compatible, but physical board layout must be modified.

Q: Why is BR24L32FV-WE2 marked "Not For New Designs"?

A: Parts marked "Not For New Designs" are in end-of-life phase. While they remain functionally compatible and available in inventory, manufacturers recommend using active status alternatives for new circuit development to ensure long-term supply availability and support.

Q: Does the 24LC32A-E/ST have the same electrical performance as 24LC32AT-E/ST?

A: Yes. Both parts are electrically identical with matching memory size, clock frequency, access time, write cycle time, voltage supply range, and operating temperature. The difference is packaging format only: 24LC32A-E/ST is supplied in Tube packaging while 24LC32AT-E/ST is supplied in Tape & Reel.

Q: Can I use a 1 MHz I2C EEPROM in a circuit designed for 400 kHz operation?

A: Yes. I2C devices operate at the lower of the two clock frequencies negotiated between master and slave. A 1 MHz capable device will operate correctly at 400 kHz. However, the circuit must support the device's minimum voltage supply requirement. For example, CAT24C32YI-GT3 requires minimum 1.7V, which is higher than the 24LC32AT-E/ST minimum of 2.5V.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL Level 1 moisture sensitivity rating, matching the environmental and regulatory requirements of the main part.

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