24FC512T-I/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24FC512T-I/ST is a 512Kbit I2C EEPROM memory IC manufactured by Microchip Technology in 8-TSSOP surface mount packaging. This non-volatile memory device operates at 1 MHz clock frequency with 400 ns access time and supports a supply voltage range of 1.7V to 5.5V across an operating temperature range of -40°C to 85°C. The device is ROHS3 compliant and carries an MSL rating of 1 (Unlimited). Substitute parts are necessary when the primary part is unavailable, when alternative packaging formats are required, or when design specifications allow for compatible alternatives from different manufacturers that meet the same functional and electrical requirements.

Key Parameters

Parameter	Value
Memory Size	512Kbit
Memory Organization	64K x 8
Memory Interface	I2C
Clock Frequency	1 MHz
Access Time	400 ns
Write Cycle Time	5 ms
Voltage Supply Range	1.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 24FC512T-I/ST is determined by strict alignment with the following core parameters: 512Kbit memory capacity, 64K x 8 memory organization, I2C interface protocol, 8-TSSOP package format, surface mount mounting type, ROHS3 compliance, and MSL rating of 1. All substitute parts listed maintain these fundamental specifications. Secondary parameters including clock frequency, access time, write cycle time, voltage supply range, and operating temperature range are provided for engineering evaluation but do not disqualify substitution when variations occur within acceptable industrial tolerances. Packaging format (Cut Tape, Tube, or Tape & Reel) represents a logistical distinction rather than a functional one and does not affect electrical compatibility.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time (ns)	Write Cycle Time	Voltage Supply	Operating Temperature	Package	Product Status
24FC512T-I/ST	Microchip Technology	512Kbit	1 MHz	400	5 ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24FC512-I/ST	Microchip Technology	512Kbit	1 MHz	400	5 ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA512T-I/ST	Microchip Technology	512Kbit	400 kHz	900	5 ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
BR24G512FVT-3AGE2	Rohm Semiconductor	512Kbit	1 MHz	Not Specified	5 ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
CAT24C512YI-GT3	onsemi	512Kbit	1 MHz	900	5 ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
M24512-DFDW6TP	STMicroelectronics	512Kbit	1 MHz	500	5 ms	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
M24512-DRDW3TP/K	STMicroelectronics	512Kbit	1 MHz	450	4 ms	1.8V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
M24512-DRDW8TP/K	STMicroelectronics	512Kbit	1 MHz	450	4 ms	1.8V ~ 5.5V	-40°C ~ 105°C	8-TSSOP	Active
M24512-RDW6TP	STMicroelectronics	512Kbit	1 MHz	500	5 ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
M24512-WDW6TP	STMicroelectronics	512Kbit	1 MHz	500	5 ms	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Not For New Designs
R1EX24512BTAS0I#S0	Renesas Electronics Corporation	512Kbit	1 MHz	550	5 ms	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active

Engineering Selection Recommendations

All listed substitute parts maintain Active product status except M24512-WDW6TP, which carries a "Not For New Designs" designation and should be avoided for new applications. Parts with Active status are suitable for ongoing production and new design implementations.

The 24FC512T-I/ST operates with a minimum supply voltage of 1.7V. Substitute parts from STMicroelectronics (M24512 series) and onsemi (CAT24C512YI-GT3) specify a minimum supply voltage of 1.8V, which is compatible with applications operating at or above 1.8V. The Renesas R1EX24512BTAS0I#S0 also requires 1.8V minimum. Applications requiring operation below 1.8V must use the primary part or the Microchip 24AA512T-I/ST alternative.

The STMicroelectronics M24512-DRDW3TP/K and M24512-DRDW8TP/K variants include AEC-Q100 automotive qualification and support extended operating temperatures (125°C and 105°C respectively), making them suitable for automotive and high-temperature applications. The M24512-DRDW3TP/K extends the upper temperature limit to 125°C.

The Microchip 24AA512T-I/ST operates at 400 kHz clock frequency with 900 ns access time, representing a lower-speed alternative suitable for applications where reduced clock frequency is acceptable or preferred.

All parts maintain ROHS3 compliance and MSL rating of 1 (Unlimited), ensuring compatibility with standard manufacturing and storage conditions.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 24FC512T-I/ST with the 24AA512T-I/ST?

A: Yes. Both parts are Microchip 512Kbit I2C EEPROM devices in 8-TSSOP packaging with identical memory organization, voltage supply range, and operating temperature. The 24AA512T-I/ST operates at 400 kHz clock frequency versus 1 MHz for the 24FC512T-I/ST, and has 900 ns access time versus 400 ns. This substitution is valid for applications where the lower clock frequency and longer access time are acceptable.

Q: What is the difference between the 24FC512-I/ST (Tube packaging) and 24FC512T-I/ST (Cut Tape packaging)?

A: Both parts are electrically and functionally identical. The difference is packaging format only. The 24FC512-I/ST is supplied in Tube packaging while the 24FC512T-I/ST is supplied in Cut Tape (CT) & Digi-Reel format. Selection depends on procurement and assembly requirements rather than electrical performance.

Q: Can I use M24512-WDW6TP as a substitute?

A: M24512-WDW6TP carries a "Not For New Designs" product status and should not be used in new applications. While electrically compatible, this part is in end-of-life status. Use alternative active parts such as M24512-RDW6TP or M24512-DFDW6TP instead.

Q: Are STMicroelectronics M24512 parts compatible with applications requiring 1.7V minimum supply voltage?

A: No. STMicroelectronics M24512 series parts specify a minimum supply voltage of 1.8V. Applications requiring operation at 1.7V must use the primary 24FC512T-I/ST or the Microchip 24AA512T-I/ST alternative.

Q: What is the significance of AEC-Q100 qualification on the M24512-DRDW3TP/K and M24512-DRDW8TP/K?

A: AEC-Q100 qualification indicates these parts meet automotive industry reliability and quality standards. These variants are suitable for automotive applications and high-reliability environments. The M24512-DRDW3TP/K supports operating temperatures to 125°C while the M24512-DRDW8TP/K supports to 105°C.

Q: Can I substitute based on clock frequency alone?

A: No. Clock frequency is a secondary parameter. Substitution eligibility is determined by matching memory capacity (512Kbit), memory organization (64K x 8), I2C interface, 8-TSSOP package, and compliance ratings. Clock frequency variations are acceptable provided the application timing requirements are met.

Q: Is the onsemi CAT24C512YI-GT3 a direct substitute?

A: Yes. The CAT24C512YI-GT3 is a 512Kbit I2C EEPROM in 8-TSSOP packaging with 1 MHz clock frequency. It specifies a minimum supply voltage of 1.8V (versus 1.7V for the primary part) and 900 ns access time. It is suitable for applications operating at 1.8V and above.

Q: What does MSL rating of 1 (Unlimited) mean?

A: MSL (Moisture Sensitivity Level) rating of 1 indicates the component has unlimited shelf life and does not require special moisture control during storage or handling. All listed parts carry this rating, ensuring standard storage and manufacturing conditions are acceptable.

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