Equivalent & Substitute Parts for 24LC64F-I/ST

Part Overview

The 24LC64F-I/ST is a 64Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface communication at 400 kHz with 900 ns access time. This non-volatile memory device is packaged in 8-TSSOP surface mount configuration and operates across a supply voltage range of 2.5V to 5.5V with temperature range of -40°C to 85°C. The part is currently in active product status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). Equivalent and substitute parts are identified based on matching or superior electrical and mechanical specifications within the 64Kbit I2C EEPROM category.

Key Parameters

Parameter	24LC64F-I/ST Value
Memory Size	64Kbit
Memory Organization	8K x 8
Memory Interface	I2C
Clock Frequency	400 kHz
Access Time	900 ns
Write Cycle Time	5ms
Voltage Supply Range	2.5V ~ 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

Substitute parts for the 24LC64F-I/ST are classified based on electrical parameter compatibility within the 64Kbit I2C EEPROM category. The primary substitution criteria are:

Critical Parameters for Substitution:

Memory Size: 64Kbit (fixed requirement)
Memory Organization: 8K x 8 (fixed requirement)
Memory Interface: I2C (fixed requirement)
Package Type: 8-TSSOP surface mount (fixed requirement)
Write Cycle Time: 5ms (fixed requirement)

Variable Parameters Allowing Substitution:

Clock Frequency: 400 kHz (baseline) or higher frequencies (1 MHz) are acceptable
Access Time: 900 ns (baseline) or faster access times are acceptable
Voltage Supply Range: 2.5V ~ 5.5V (baseline) or wider ranges are acceptable
Operating Temperature: -40°C ~ 85°C (baseline) or extended ranges are acceptable
MSL Rating: 1 (Unlimited) baseline; MSL 3 acceptable for non-critical applications

Substitute parts are grouped into two categories: Manufacturer Recommended Substitutes (direct replacements with verified or equivalent performance) and Parametric Equivalents (parts meeting all critical parameters with identical or superior electrical characteristics).

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temp	Package	MSL Rating	Product Status
24LC64F-I/ST	Microchip	64Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	1	Active
24AA64-I/ST	Microchip	64Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	1	Active
24AA64F-I/ST	Microchip	64Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	1	Active
24FC64F-I/ST	Microchip	64Kbit	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	1	Active
24LC64-E/ST	Microchip	64Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	1	Active
24LC64F-E/ST	Microchip	64Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	1	Active
AT24C64B-10TU-1.8	Microchip	64Kbit	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	3	Active
AT24C64B-10TU-2.7	Microchip	64Kbit	400 kHz	900 ns	2.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	1	Active
AT24C64D-XHM-B	Microchip	64Kbit	1 MHz	550 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	3	Active
24LC64-I/ST	Microchip	64Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	1	Active
24LC64X-I/ST	Microchip	64Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	1	Active

Engineering Selection Recommendations

Direct Substitutes (Identical Electrical Performance): 24LC64-I/ST and 24LC64X-I/ST are parametric equivalents with identical specifications to the 24LC64F-I/ST. Both parts maintain the same voltage supply range (2.5V ~ 5.5V), operating temperature (-40°C ~ 85°C), clock frequency (400 kHz), and access time (900 ns). All three parts carry ROHS3 compliance and MSL 1 rating.

Extended Temperature Range Substitutes: 24LC64-E/ST and 24LC64F-E/ST provide extended operating temperature range (-40°C ~ 125°C) while maintaining identical electrical specifications. These parts are suitable for applications requiring higher temperature operation.

Lower Voltage Supply Substitutes: 24AA64-I/ST and 24AA64F-I/ST support lower minimum supply voltage (1.7V vs. 2.5V) with identical clock frequency and access time specifications. These parts are suitable for low-power applications.

Higher Clock Frequency Substitutes: 24FC64F-I/ST and AT24C64D-XHM-B operate at 1 MHz clock frequency with faster access times (400 ns and 550 ns respectively) compared to the baseline 400 kHz / 900 ns specification. These parts are suitable for applications requiring higher data transfer rates.

Voltage-Specific Substitutes: AT24C64B-10TU-1.8 supports 1.8V minimum supply voltage; AT24C64B-10TU-2.7 supports 2.7V minimum supply voltage. Both maintain 400 kHz clock frequency and 900 ns access time. AT24C64B-10TU-2.7 carries MSL 1 rating identical to the main part.

All substitute parts are manufactured by Microchip Technology, carry ROHS3 compliance, and maintain active product status. Selection should be based on specific application requirements for voltage supply range, operating temperature, clock frequency, and moisture sensitivity level.

Frequently Asked Questions (FAQ)

Q: Can I substitute 24LC64F-I/ST with 24AA64-I/ST? A: Yes. The 24AA64-I/ST is a direct functional substitute with identical memory size (64Kbit), interface (I2C), clock frequency (400 kHz), access time (900 ns), and package (8-TSSOP). The 24AA64-I/ST provides wider voltage supply range (1.7V ~ 5.5V vs. 2.5V ~ 5.5V), making it suitable for lower-voltage applications.

Q: What is the difference between 24LC64F-I/ST and 24FC64F-I/ST? A: The primary difference is clock frequency and access time. The 24FC64F-I/ST operates at 1 MHz with 400 ns access time, compared to 24LC64F-I/ST at 400 kHz with 900 ns access time. Both maintain identical memory size, organization, and package. The 24FC64F-I/ST is suitable for applications requiring faster I2C communication.

Q: Are AT24C64 series parts compatible with 24LC64F-I/ST? A: Yes, AT24C64 series parts are compatible substitutes. All AT24C64 variants maintain 64Kbit memory size, I2C interface, 8-TSSOP package, and 5ms write cycle time. Differences exist in voltage supply range, clock frequency, and MSL rating. AT24C64B-10TU-2.7 provides closest parameter match with MSL 1 rating.

Q: Can I use 24LC64-E/ST in place of 24LC64F-I/ST? A: Yes. The 24LC64-E/ST is a direct electrical substitute with identical memory specifications, clock frequency (400 kHz), access time (900 ns), and voltage supply range (2.5V ~ 5.5V). The 24LC64-E/ST provides extended operating temperature range (-40°C ~ 125°C vs. -40°C ~ 85°C), suitable for high-temperature applications.

Q: What does MSL rating mean for EEPROM substitution? A: MSL (Moisture Sensitivity Level) indicates the component's sensitivity to moisture during storage and handling. MSL 1 (Unlimited) allows indefinite storage without baking. MSL 3 (168 Hours) requires baking before reflow soldering if storage exceeds 168 hours. For non-critical applications, MSL 3 parts are acceptable substitutes for MSL 1 parts.

Q: Are all substitute parts in the same 8-TSSOP package? A: Yes. All listed substitute parts use identical 8-TSSOP surface mount package (0.173", 4.40mm Width). Package compatibility is guaranteed across all substitutes, allowing direct PCB placement without layout modifications.

Q: Which substitute offers the lowest minimum supply voltage? A: The 24AA64-I/ST and 24AA64F-I/ST offer the lowest minimum supply voltage at 1.7V, compared to 2.5V for the main part 24LC64F-I/ST. These parts are suitable for battery-powered and ultra-low-power applications.

Q: Can I use higher clock frequency parts as substitutes? A: Yes. The 24FC64F-I/ST (1 MHz) and AT24C64D-XHM-B (1 MHz) operate at higher clock frequencies than the baseline 400 kHz specification. These parts are backward compatible and can be used in applications designed for 400 kHz operation, providing performance headroom.

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