FT24C1024A-USR-T Equivalent & Substitute Parts

Part Overview

The FT24C1024A-USR-T is a 1Mbit EEPROM memory IC manufactured by Fremont Micro Devices Ltd, featuring I2C interface with 400 kHz clock frequency and 8-SOP packaging. This non-volatile memory device operates across a supply voltage range of 1.8V to 5.5V and maintains active product status with full RoHS3 compliance. Substitute parts are identified based on matching core electrical specifications: 1Mbit capacity, 128K x 8 organization, I2C interface, 8-SOIC/8-SOP package format, and compatible operating temperature range of -40°C to 85°C.

Key Parameters

Parameter	FT24C1024A-USR-T
Memory Size	1Mbit
Memory Organization	128K x 8
Memory Interface	I2C
Clock Frequency	400 kHz
Access Time	900 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 are grouped into two categories based on clock frequency compatibility:

Category A: 400 kHz I2C Clock Frequency Parts maintaining the original 400 kHz clock specification: 24AA1025T-I/SN and 24AA1026-I/SN. These devices are direct functional equivalents with identical memory organization and interface timing.

Category B: 1 MHz I2C Clock Frequency Parts operating at 1 MHz clock frequency: 24FC1025T-I/SN, 24FC1026T-I/SN, AT24CM01-SSHM-T, BR24G1MFJ-3AGTE2, CAT24M01WI-GT3, CAV24M01WE-GT3, M24M01-DFMN6TP, and M24M01-RMN6TP. These devices provide enhanced performance with faster access times while maintaining 1Mbit capacity and I2C interface compatibility.

All substitute parts share the following critical parameters with the main part:

Memory Size: 1Mbit
Memory Organization: 128K x 8
Memory Interface: I2C
Package Format: 8-SOIC (0.154", 3.90mm Width)
Write Cycle Time: 5ms
Operating Temperature: -40°C ~ 85°C
RoHS3 Compliance
Surface Mount Technology

Parameter Comparison

Part Number	Manufacturer	Clock Frequency	Access Time	Voltage Supply	Package	Inventory
FT24C1024A-USR-T	Fremont Micro Devices Ltd	400 kHz	900 ns	1.8V ~ 5.5V	8-SOP	1032 Pcs
24AA1025T-I/SN	Microchip Technology	400 kHz	900 ns	1.7V ~ 5.5V	8-SOIC	1320 Pcs
24AA1026-I/SN	Microchip Technology	400 kHz	900 ns	1.7V ~ 5.5V	8-SOIC	1420 Pcs
24FC1025T-I/SN	Microchip Technology	1 MHz	400 ns	1.8V ~ 5.5V	8-SOIC	8942 Pcs
24FC1026T-I/SN	Microchip Technology	1 MHz	400 ns	1.8V ~ 5.5V	8-SOIC	10000 Pcs
AT24CM01-SSHM-T	Microchip Technology	1 MHz	550 ns	1.7V ~ 5.5V	8-SOIC	18188 Pcs
BR24G1MFJ-3AGTE2	Rohm Semiconductor	1 MHz	Not specified	1.7V ~ 5.5V	8-SOP-J	3675 Pcs
CAT24M01WI-GT3	onsemi	1 MHz	400 ns	1.8V ~ 5.5V	8-SOIC	17169 Pcs
CAV24M01WE-GT3	onsemi	1 MHz	400 ns	2.5V ~ 5.5V	8-SOIC	1875 Pcs
M24M01-DFMN6TP	STMicroelectronics	1 MHz	500 ns	1.7V ~ 5.5V	8-SOIC	1759 Pcs
M24M01-RMN6TP	STMicroelectronics	1 MHz	500 ns	1.8V ~ 5.5V	8-SOIC	105300 Pcs

Engineering Selection Recommendations

For Direct 400 kHz Replacement: 24AA1025T-I/SN and 24AA1026-I/SN from Microchip Technology provide identical clock frequency and access time specifications. Both maintain active product status and RoHS3 compliance. Selection between these two depends on packaging preference (Cut Tape vs. Tube) and inventory availability.

For Enhanced Performance (1 MHz Operation): 24FC1025T-I/SN and 24FC1026T-I/SN offer 2.25x faster access time (400 ns vs. 900 ns) while maintaining voltage supply compatibility with the original part. Both are Microchip products with active status and extensive inventory availability.

For Verified Programmable Devices: AT24CM01-SSHM-T and CAT24M01WI-GT3 carry DiGi-Electronics Programmable verification status. AT24CM01-SSHM-T supports lower minimum voltage (1.7V) with MSL-3 rating. CAT24M01WI-GT3 maintains MSL-1 rating with 400 ns access time.

For High-Volume Applications: M24M01-RMN6TP from STMicroelectronics offers the largest inventory (105,300 Pcs) with verified programmable status, 1 MHz clock frequency, and 1.8V minimum voltage compatibility.

For Automotive-Grade Requirements: CAV24M01WE-GT3 is the only AEC-Q100 qualified option with automotive-grade specification and extended operating temperature range (-40°C to 125°C). Minimum voltage requirement is 2.5V.

Frequently Asked Questions (FAQ)

Q: Can I use a 1 MHz part as a direct replacement for the 400 kHz FT24C1024A-USR-T? A: Yes. The 1 MHz parts (24FC1025T-I/SN, 24FC1026T-I/SN, AT24CM01-SSHM-T, CAT24M01WI-GT3, M24M01-DFMN6TP, M24M01-RMN6TP) are backward compatible. I2C bus speed is determined by the master controller, not the slave device. These parts operate at the bus speed commanded by the system and provide faster access times as a benefit.

Q: What is the difference between 8-SOP and 8-SOIC packaging? A: Both are 8-pin surface mount packages with 0.154" width and 3.90mm body width. 8-SOP (Small Outline Package) and 8-SOIC (Small Outline Integrated Circuit) are functionally equivalent for PCB layout purposes. Pin pitch and lead dimensions are identical.

Q: Why do some parts have lower minimum voltage (1.7V) while others require 1.8V? A: This reflects manufacturer design specifications. Parts with 1.7V minimum voltage provide broader supply range compatibility. For systems operating above 1.8V, both specifications are equivalent. For systems operating between 1.7V and 1.8V, select parts with 1.7V minimum rating.

Q: What does MSL-1 vs. MSL-3 mean for my application? A: MSL (Moisture Sensitivity Level) indicates moisture exposure limits during storage and handling. MSL-1 (Unlimited) allows indefinite storage without moisture control. MSL-3 (168 Hours) requires controlled storage conditions and limits moisture exposure to 168 hours at specified humidity levels. For standard manufacturing environments, MSL-1 parts are preferred.

Q: Is the AT24CM01-SSHM-T with MSL-3 suitable for high-volume production? A: Yes, if your manufacturing process includes proper moisture control and baking procedures. MSL-3 parts require moisture management during storage and assembly but are fully functional once soldered. Verify your production environment meets MSL-3 handling requirements.

Q: Which part has the fastest access time? A: 24FC1025T-I/SN and 24FC1026T-I/SN both provide 400 ns access time, the fastest among all listed substitutes. This is 2.25x faster than the original FT24C1024A-USR-T (900 ns).

Q: Can I use CAV24M01WE-GT3 in a system designed for 1.8V minimum voltage? A: No. CAV24M01WE-GT3 requires minimum 2.5V supply voltage. This part is specified for automotive applications with higher voltage requirements. Use this part only in systems with 2.5V or higher supply voltage.

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