FT24C32A-USR-T EEPROM 32Kbit I2C Equivalent & Substitute Parts

Part Overview

The FT24C32A-USR-T is a 32Kbit EEPROM memory IC manufactured by Fremont Micro Devices Ltd, featuring I2C interface operation at 800 kHz with 700 ns access time in an 8-SOP package. This part is discontinued at DiGi Electronics. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications requiring 32Kbit I2C EEPROM functionality.

Key Parameters

Parameter	FT24C32A-USR-T
Memory Size	32Kbit
Memory Organization	4K x 8
Memory Interface	I2C
Clock Frequency	800 kHz
Access Time	700 ns
Write Cycle Time	5ms
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
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the FT24C32A-USR-T are grouped based on strict electrical and mechanical compatibility within the following allowed parameters:

Core Compatibility Criteria:

Memory Size: 32Kbit (mandatory)
Memory Organization: 4K x 8 (mandatory)
Memory Interface: I2C (mandatory)
Memory Format: EEPROM (mandatory)
Package / Case: 8-SOIC form factor with 0.154" width (mandatory)
Mounting Type: Surface Mount (mandatory)
Operating Temperature Range: -40°C ~ 85°C (mandatory)
Voltage Supply Range: Minimum 1.8V, Maximum 5.5V (mandatory)
Write Cycle Time: 5ms (mandatory)

Variable Parameters Allowing Substitution:

Clock Frequency: 400 kHz to 1 MHz (higher frequencies maintain backward compatibility)
Access Time: 550 ns to 900 ns (longer access times maintain compatibility)
Voltage Supply Range: 1.6V to 1.8V minimum, up to 5.5V maximum (wider ranges maintain compatibility)
Product Status: Active parts preferred over discontinued parts
Packaging Format: Cut Tape (CT), Tube, or Tape & Reel (TR) formats are interchangeable

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Package	Product Status	Inventory
FT24C32A-USR-T	Fremont Micro Devices Ltd	32Kbit	800 kHz	700 ns	1.8V ~ 5.5V	8-SOP	Discontinued	16799 Pcs
FT24C32A-USG-T	Fremont Micro Devices Ltd	32Kbit	800 kHz	700 ns	1.8V ~ 5.5V	8-SOP	Discontinued	1253 Pcs
24AA32A-I/SN	Microchip Technology	32Kbit	400 kHz	900 ns	1.8V ~ 5.5V	8-SOIC	Active	66200 Pcs
24AA32AF-I/SN	Microchip Technology	32Kbit	400 kHz	900 ns	1.7V ~ 5.5V	8-SOIC	Active	3052 Pcs
24AA32AFT-I/SN	Microchip Technology	32Kbit	400 kHz	900 ns	1.7V ~ 5.5V	8-SOIC	Active	15200 Pcs
24AA32AT-I/SN	Microchip Technology	32Kbit	400 kHz	900 ns	1.8V ~ 5.5V	8-SOIC	Active	16202 Pcs
AT24CS32-SSHM-T	Microchip Technology	32Kbit	1 MHz	550 ns	1.7V ~ 5.5V	8-SOIC	Active	3400 Pcs
BR24G32F-3GTE2	Rohm Semiconductor	32Kbit	400 kHz	Not specified	1.6V ~ 5.5V	8-SOP	Active	3383 Pcs
BR24G32FJ-3AGTE2	Rohm Semiconductor	32Kbit	1 MHz	Not specified	1.7V ~ 5.5V	8-SOP-J	Active	60439 Pcs
BR24G32FJ-3GTE2	Rohm Semiconductor	32Kbit	400 kHz	Not specified	1.6V ~ 5.5V	8-SOP-J	Active	105400 Pcs
BR24L32FJ-WE2	Rohm Semiconductor	32Kbit	400 kHz	Not specified	1.8V ~ 5.5V	8-SOP-J	Active	7159 Pcs

Engineering Selection Recommendations

Primary Equivalent (Parametric Match): FT24C32A-USG-T is the direct parametric equivalent from Fremont Micro Devices Ltd, matching all electrical specifications and package requirements. However, this part shares discontinued status with the main part.

Active Alternatives by Priority:

Tier 1 - Highest Compatibility (Active Status):

24AA32AT-I/SN (Microchip Technology): Matches voltage supply range (1.8V ~ 5.5V), maintains 5ms write cycle time, and holds active product status with verified programmability. Clock frequency reduced to 400 kHz and access time increased to 900 ns remain within functional tolerance for I2C EEPROM applications.
BR24L32FJ-WE2 (Rohm Semiconductor): Matches voltage supply range (1.8V ~ 5.5V), maintains 5ms write cycle time, verified programmability, and active status. 8-SOP-J package maintains mechanical compatibility with 0.154" width specification.

Tier 2 - Extended Voltage Range (Active Status):

24AA32AF-I/SN and 24AA32AFT-I/SN (Microchip Technology): Support extended lower voltage operation (1.7V minimum), active status, and identical memory organization. Suitable for applications with relaxed voltage requirements.
BR24G32FJ-3GTE2 (Rohm Semiconductor): Supports extended lower voltage operation (1.6V minimum), active status, and highest inventory availability (105400 Pcs). Clock frequency at 400 kHz and 8-SOP-J package maintain compatibility.

Tier 3 - Enhanced Performance (Active Status):

AT24CS32-SSHM-T (Microchip Technology): Provides superior clock frequency (1 MHz) and faster access time (550 ns) for applications requiring higher performance. Voltage range 1.7V ~ 5.5V and active status support deployment.
BR24G32FJ-3AGTE2 (Rohm Semiconductor): Offers 1 MHz clock frequency with active status and high inventory (60439 Pcs). Voltage range 1.7V ~ 5.5V accommodates most applications.

Compliance Verification: All substitute parts maintain ROHS3 compliance, REACH unaffected status, and MSL rating of 1 (Unlimited) or MSL 3 (168 Hours for AT24CS32-SSHM-T), ensuring regulatory and environmental compatibility with the original part.

Frequently Asked Questions (FAQ)

Q: Can I use a 400 kHz I2C EEPROM as a substitute for the 800 kHz FT24C32A-USR-T? A: Yes. The 400 kHz parts (24AA32A-I/SN, 24AA32AF-I/SN, 24AA32AFT-I/SN, 24AA32AT-I/SN, BR24G32F-3GTE2, BR24G32FJ-3GTE2, BR24L32FJ-WE2) are functionally compatible. I2C bus speed is determined by the master controller, not the slave device. A 400 kHz rated device operates correctly on an 800 kHz bus through backward compatibility.

Q: What is the difference between 8-SOP and 8-SOP-J packages? A: Both are 8-pin surface mount packages with 0.154" width (3.90mm). The -J designation indicates a specific variant. Both maintain mechanical and electrical compatibility for PCB mounting and circuit operation.

Q: Why do some parts list access time as "not specified"? A: Rohm Semiconductor parts (BR24G32 series) do not provide explicit access time specifications in the available data. These parts maintain functional compatibility through I2C protocol compliance and identical memory organization (4K x 8).

Q: Is the 1 MHz AT24CS32-SSHM-T a direct replacement? A: Yes, with performance enhancement. The AT24CS32-SSHM-T operates at 1 MHz with 550 ns access time, exceeding the original 800 kHz specification. It is fully backward compatible and suitable for applications requiring higher performance margins.

Q: What voltage range should I verify for my application? A: Confirm your system's supply voltage operates within the substitute part's specified range. Most parts support 1.8V ~ 5.5V. Parts with 1.6V or 1.7V minimums (BR24G32 series, 24AA32AF variants) extend lower voltage operation. Parts with 1.8V minimum (FT24C32A-USR-T, 24AA32A-I/SN, 24AA32AT-I/SN, BR24L32FJ-WE2) require higher minimum voltage.

Q: Are all substitute parts RoHS compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original part's regulatory requirements.

Q: Which substitute has the highest inventory availability? A: BR24G32FJ-3GTE2 (Rohm Semiconductor) offers the highest inventory at 105,400 pieces, followed by 24AA32AT-I/SN (Microchip Technology) at 16,202 pieces.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message