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

Part Overview

The FT24C32A-UTR-T is a 32Kbit EEPROM memory IC with I2C interface manufactured by Fremont Micro Devices Ltd in 8-TSSOP surface mount packaging. This part is discontinued at DiGi Electronics. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for production and maintenance applications. Substitute parts must maintain functional compatibility across memory capacity, interface protocol, package type, and electrical operating parameters.

Key Parameters

Parameter	FT24C32A-UTR-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-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the FT24C32A-UTR-T are qualified based on the following criteria:

Critical Parameters (Must Match):

Memory Size: 32Kbit
Memory Organization: 4K x 8
Memory Interface: I2C
Package / Case: 8-TSSOP (0.173", 4.40mm Width)
Mounting Type: Surface Mount
Operating Temperature Range: -40°C ~ 85°C minimum
Voltage Supply Range: Must encompass or overlap with 1.8V ~ 5.5V

Performance Parameters (Acceptable Variation):

Clock Frequency: 400 kHz to 1 MHz (all substitute parts support I2C operation)
Access Time: 400 ns to 900 ns (all within acceptable I2C timing margins)
Write Cycle Time: 5ms (consistent across all parts)

Compliance Parameters (Must Match):

RoHS3 Compliant
REACH Unaffected
ECCN: EAR99
HTSUS: 8542.32.0051

All substitute parts listed maintain functional compatibility with the original FT24C32A-UTR-T across these parameters.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temp	Package	Product Status
FT24C32A-UTR-T	Fremont Micro Devices Ltd	32Kbit	800 kHz	700 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Discontinued
24AA32A-I/ST	Microchip Technology	32Kbit	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA32AF-I/ST	Microchip Technology	32Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA32AFT-I/ST	Microchip Technology	32Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA32AT-I/ST	Microchip Technology	32Kbit	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
AT24CS32-XHM-T	Microchip Technology	32Kbit	1 MHz	550 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
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
CAT24C32YI-GT3	onsemi	32Kbit	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

Microchip Technology 24AA32A-I/ST, 24AA32AF-I/ST, 24AA32AFT-I/ST, and 24AA32AT-I/ST are direct functional equivalents. All maintain 32Kbit capacity, I2C interface, 8-TSSOP packaging, and -40°C to 85°C operating range. These parts are in active production status. The 24AA32AT-I/ST variant offers voltage supply range of 1.8V ~ 5.5V, matching the original specification exactly.

Secondary Substitutes (Enhanced Performance):

AT24CS32-XHM-T (Microchip Technology) and CAT24C32YI-GT3 (onsemi) provide higher clock frequency (1 MHz) and faster access times (550 ns and 400 ns respectively), offering performance improvement over the original 800 kHz / 700 ns specification while maintaining full backward compatibility.

Rohm Semiconductor Alternatives:

BR24G32FVT-3AGE2, BR24G32FVT-3GE2, BR24L32FVT-WE2, and BR24S32FVT-WE2 are functionally equivalent with 32Kbit capacity and I2C interface in 8-TSSOP-B packaging. These parts are in active production. BR24L32FVT-WE2 and BR24S32FVT-WE2 carry DiGi-Electronics Programmable verification status.

Compliance Assurance:

All listed substitute parts maintain ROHS3 compliance, REACH unaffected status, EAR99 ECCN classification, and HTSUS code 8542.32.0051, ensuring regulatory and supply chain compatibility.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with 400 kHz clock frequency instead of the original 800 kHz?

A: Yes. The FT24C32A-UTR-T operates at 800 kHz, but I2C protocol supports operation at lower frequencies including 400 kHz. Substitute parts rated for 400 kHz are fully compatible and will operate correctly in systems designed for the original part. System timing margins remain within specification.

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

A: Both are 8-pin thin shrink small outline packages with identical 0.173" width and 4.40mm dimensions. The -B designation indicates a variant from Rohm Semiconductor. Pin configuration and footprint compatibility are maintained across both variants for this product category.

Q: Are Rohm Semiconductor BR24 series parts pin-compatible with Microchip 24AA32 series?

A: Yes. All listed parts maintain identical 8-TSSOP pin configuration and I2C interface protocol. Pin-to-pin compatibility is confirmed across manufacturers for this 32Kbit I2C EEPROM category.

Q: Which substitute offers the best performance improvement?

A: CAT24C32YI-GT3 (onsemi) provides the fastest access time at 400 ns and operates at 1 MHz clock frequency. AT24CS32-XHM-T (Microchip Technology) also operates at 1 MHz with 550 ns access time. Both represent performance enhancement over the original 700 ns specification.

Q: Can I substitute a part with lower minimum voltage supply (1.6V) for a design requiring 1.8V minimum?

A: No. The original FT24C32A-UTR-T specifies 1.8V minimum supply voltage. Substitute parts must meet or exceed this minimum. BR24G32FVT-3GE2 with 1.6V minimum is not suitable for designs requiring 1.8V operation. Select parts with 1.8V or higher minimum voltage specification.

Q: What is the significance of DiGi-Electronics Programmable verification?

A: DiGi-Electronics Programmable verification indicates the part has been tested and confirmed for programming compatibility with DiGi Electronics's programming services. Parts marked as "Not Verified" are functionally equivalent but have not undergone this specific verification process. Both verified and unverified parts are electrically compatible.

Q: Are all substitute parts in active production status?

A: Yes. All listed substitute parts carry active production status, ensuring long-term availability and supply chain continuity. The original FT24C32A-UTR-T is discontinued at DiGi Electronics, making active substitutes essential for ongoing design support.

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