FT24C02A-UNR-T Equivalent & Substitute Parts

Part Overview

The FT24C02A-UNR-T is a 2Kbit EEPROM memory IC with I2C interface manufactured by Fremont Micro Devices Ltd. This device is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives. The part operates at 1 MHz clock frequency with 550 ns access time, supporting supply voltages from 1.8V to 5.5V across the industrial temperature range of -40°C to 85°C. Surface mount packaging in 8-DFN (2x3) format with exposed pad provides compact integration for embedded applications requiring non-volatile memory storage.

Key Parameters

Parameter	Value
Memory Size	2Kbit
Memory Organization	256 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 Type	8-WFDFN Exposed Pad
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict parameter matching across memory capacity, interface protocol, package format, and electrical operating ranges. The FT24C02A-UNR-T requires replacement parts meeting the following criteria:

Critical Parameters for Substitution:

Memory Size: 2Kbit (256 x 8 organization)
Interface: I2C protocol
Package: 8-pin DFN format with exposed pad
Supply Voltage: Minimum 1.8V support required
Temperature Range: Minimum -40°C to 85°C coverage
RoHS3 Compliance: Required
MSL Rating: 1 (Unlimited)

Acceptable Variations:

Clock Frequency: 400 kHz or 1 MHz (both support I2C standard operation)
Access Time: 400 ns to 900 ns (performance variation acceptable for non-real-time applications)
Packaging Format: 8-DFN or 8-TDFN (both mechanically compatible in 2x3 footprint)

Parametric Equivalent (Direct Replacement): FT24C02A-KNR-T matches all electrical and mechanical specifications with identical 1 MHz clock frequency and 550 ns access time. Difference is packaging format (Tape & Reel vs. bulk).

Similar Alternatives (Functional Equivalents): Microchip Technology 24-series and 34-series parts provide 2Kbit I2C EEPROM functionality with compatible pinouts and package footprints. Clock frequency reduction to 400 kHz and access time increase to 900 ns remain within acceptable I2C protocol specifications for most applications.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Supply Voltage	Temp Range	Package	Status
FT24C02A-UNR-T	Fremont Micro Devices	2Kbit	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-DFN (2x3)	Discontinued
FT24C02A-KNR-T	Fremont Micro Devices	2Kbit	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-DFN (2x3)	Active
24AA024HT-I/MNY	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TDFN (2x3)	Active
24AA024T-I/MNY	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TDFN (2x3)	Active
24AA025T-I/MNY	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TDFN (2x3)	Active
24AA02HT-I/MNY	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TDFN (2x3)	Active
24AA02T-I/MNY	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TDFN (2x3)	Active
24AA52T-I/MNY	Microchip Technology	2Kbit	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TDFN (2x3)	Active
24LC024HT-I/MNY	Microchip Technology	2Kbit	1 MHz	400 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-TDFN (2x3)	Active
34AA02T-E/MNY	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 125°C	8-TDFN (2x3)	Active
34AA02T-I/MNY	Microchip Technology	2Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TDFN (2x3)	Active

Engineering Selection Recommendations

First Choice - Parametric Equivalent: FT24C02A-KNR-T is the direct parametric replacement, maintaining identical electrical specifications and 1 MHz performance. Active product status with 1024 units in stock ensures supply continuity. Tape & Reel packaging accommodates high-volume production requirements.

Primary Alternative - Full Compatibility: 24LC024HT-I/MNY provides 1 MHz clock frequency matching the original specification with improved 400 ns access time. Microchip Technology active product status and 4246 units in inventory provide supply security. Supply voltage range of 2.5V to 5.5V is compatible with most applications requiring 1.8V minimum operation; verify circuit design if 1.8V operation is critical.

Secondary Alternatives - Functional Equivalents: 24AA02T-I/MNY, 24AA02HT-I/MNY, 24AA024HT-I/MNY, 24AA024T-I/MNY, 24AA025T-I/MNY, and 34AA02T-I/MNY operate at 400 kHz with 900 ns access time. These parts maintain 2Kbit capacity, I2C interface, and 8-TDFN package compatibility. All are ROHS3 compliant with MSL 1 rating. Microchip Technology manufacturing ensures long-term availability and supply chain stability.

Extended Temperature Option: 34AA02T-E/MNY extends operating range to -40°C to 125°C for high-temperature applications. Electrical specifications remain compatible with 400 kHz operation and 900 ns access time.

Supply Voltage Consideration: 24AA52T-I/MNY maintains 1.8V minimum supply voltage matching the original part, while most Microchip 24AA02 variants specify 1.7V minimum. For applications requiring strict 1.8V operation, 24AA52T-I/MNY or 24LC024HT-I/MNY are preferred.

Frequently Asked Questions (FAQ)

Q: Can I use a 400 kHz part as a direct replacement for the 1 MHz FT24C02A-UNR-T?

A: Yes. The I2C protocol supports both 400 kHz and 1 MHz clock frequencies. A 400 kHz part operates within standard I2C specifications and is functionally compatible. System timing must accommodate the slower 900 ns access time versus the original 550 ns, but this is acceptable for non-real-time memory operations.

Q: What is the difference between 8-DFN and 8-TDFN packages?

A: Both are 8-pin DFN packages in 2x3mm footprint with exposed pad. DFN (Dual Flat No-lead) and TDFN (Thin DFN) refer to manufacturing variants. Mechanical compatibility and PCB footprints are identical. Electrical performance is equivalent.

Q: Is FT24C02A-KNR-T a true drop-in replacement?

A: Yes. FT24C02A-KNR-T is parametrically identical to FT24C02A-UNR-T with matching 1 MHz clock frequency, 550 ns access time, 1.8V to 5.5V supply range, and -40°C to 85°C temperature range. The only difference is packaging format (Tape & Reel vs. bulk). No circuit modifications are required.

Q: Why do some alternatives specify 1.7V minimum supply voltage instead of 1.8V?

A: Microchip 24AA02 series parts are rated for 1.7V minimum operation, providing broader supply voltage compatibility. The original FT24C02A-UNR-T specifies 1.8V minimum. For applications requiring strict 1.8V operation, select 24AA52T-I/MNY or 24LC024HT-I/MNY.

Q: Can I use 24LC024HT-I/MNY if my circuit operates at 1.8V?

A: No. 24LC024HT-I/MNY specifies 2.5V minimum supply voltage. This part is not suitable for 1.8V operation. Select alternatives with 1.7V or 1.8V minimum ratings.

Q: What is the significance of the 34AA02 series extended temperature range?

A: 34AA02T-E/MNY operates to 125°C maximum, compared to 85°C for standard parts. This extended range is for high-temperature applications. Standard -40°C to 85°C range is sufficient for most industrial and consumer applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed alternatives are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental certifications.

Q: What inventory levels should I consider for production planning?

A: FT24C02A-KNR-T has 1024 units available. Microchip alternatives range from 726 to 9279 units in stock. 24AA024HT-I/MNY offers the highest inventory at 9279 units for high-volume requirements.

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