AT24C64C-TH-T EEPROM 64Kbit I2C Equivalent & Substitute Parts

Part Overview

The AT24C64C-TH-T is a 64Kbit EEPROM memory IC with I2C interface manufactured by Microchip Technology. This part operates at 1 MHz clock frequency with 550 ns access time and supports supply voltages from 1.8V to 5.5V across the industrial temperature range of -40°C to 85°C. The device is packaged in 8-TSSOP surface mount configuration with 8K x 8 memory organization.

The AT24C64C-TH-T is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and legacy system support.

Key Parameters

Parameter	Value
Memory Size	64Kbit
Memory Organization	8K x 8
Memory Interface	I2C
Clock Frequency	1 MHz
Access Time	550 ns
Write Cycle Time	5 ms
Supply Voltage Range	1.8V ~ 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

Substitute Part Grouping Explanation

Substitution for the AT24C64C-TH-T is determined by the following critical parameters:

Memory capacity: 64Kbit
Memory organization: 8K x 8
Interface protocol: I2C
Package type: 8-TSSOP surface mount
Supply voltage compatibility: minimum 1.8V support
RoHS3 compliance

Substitute parts are grouped into two categories based on clock frequency capability:

Category 1: 1 MHz Clock Frequency (Direct Functional Equivalents) Parts operating at 1 MHz match the original part's high-speed I2C performance and access time specifications.

Category 2: 400 kHz Clock Frequency (Reduced Speed Alternatives) Parts operating at 400 kHz provide functional substitution with slower I2C bus operation and longer access times. These are suitable for applications where the reduced clock frequency does not impact system performance.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Supply Voltage	Operating Temperature	Package	Product Status
AT24C64C-TH-T	Microchip Technology	64Kbit	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Obsolete
24FC64-I/ST	Microchip Technology	64Kbit	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA64F-I/ST	Microchip Technology	64Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA64-E/ST	Microchip Technology	64Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
24AA64FT-I/ST	Microchip Technology	64Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA64T-E/ST	Microchip Technology	64Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
24AA64T-I/ST	Microchip Technology	64Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24AA64X-I/ST	Microchip Technology	64Kbit	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
24AA64X/ST	Microchip Technology	64Kbit	400 kHz	900 ns	1.8V ~ 5.5V	0°C ~ 70°C	8-TSSOP	Active
24AA64XT-I/ST	Microchip Technology	64Kbit	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
24AA64XT/ST	Microchip Technology	64Kbit	400 kHz	900 ns	1.8V ~ 5.5V	0°C ~ 70°C	8-TSSOP	Active

Engineering Selection Recommendations

Primary Recommendation: 24FC64-I/ST

The 24FC64-I/ST is the preferred direct substitute. It maintains 1 MHz clock frequency operation and provides superior access time (400 ns versus 550 ns). The part is in active production status with ROHS3 compliance and operates across the same industrial temperature range (-40°C to 85°C). Supply voltage range is 1.7V to 5.5V, which encompasses the original part's 1.8V to 5.5V specification.

Secondary Recommendation: 24AA64-E/ST or 24AA64T-E/ST

These parts operate at 400 kHz clock frequency with extended temperature range support (-40°C to 125°C). Selection between these variants depends on packaging requirements (tube versus tape & reel). Both are in active production with ROHS3 compliance and support the full industrial temperature range.

Alternative for Extended Temperature: 24AA64X-I/ST or 24AA64XT-I/ST

These variants provide -40°C to 125°C operating range with 1.8V to 5.5V supply voltage compatibility. The 24AA64XT-I/ST is available in tape & reel packaging for automated assembly.

Restricted Use: 24AA64X/ST and 24AA64XT/ST

These parts operate within the commercial temperature range (0°C to 70°C) and are not suitable for industrial applications requiring -40°C operation.

Frequently Asked Questions (FAQ)

Q: Can 24AA64 series parts (400 kHz) directly replace the AT24C64C-TH-T (1 MHz)?

A: Yes, with system-level verification. The 24AA64 series provides functional I2C EEPROM substitution with identical memory capacity and organization. The reduced clock frequency (400 kHz versus 1 MHz) and longer access time (900 ns versus 550 ns) require confirmation that I2C bus timing and application response requirements are met. No hardware changes are necessary.

Q: What is the difference between 24AA64F-I/ST, 24AA64FT-I/ST, and 24AA64T-I/ST?

A: These parts differ in packaging format. The 24AA64F-I/ST is supplied in tube packaging. The 24AA64FT-I/ST and 24AA64T-I/ST are supplied in tape & reel format suitable for automated pick-and-place assembly. All three share identical electrical specifications (64Kbit, 400 kHz, 8-TSSOP package).

Q: Is the 24AA64X/ST suitable for industrial applications?

A: No. The 24AA64X/ST operates within the commercial temperature range (0°C to 70°C) and is not rated for the -40°C lower limit required in industrial environments. Use 24AA64X-I/ST or 24AA64XT-I/ST for industrial temperature range applications.

Q: What is the advantage of 24FC64-I/ST over 24AA64 variants?

A: The 24FC64-I/ST maintains the original 1 MHz clock frequency with improved access time (400 ns). This provides the closest electrical performance match to the AT24C64C-TH-T. Selection depends on whether the application requires 1 MHz I2C bus operation or if 400 kHz operation is acceptable.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the original AT24C64C-TH-T specification.

Q: What packaging options are available for production?

A: Substitute parts are available in tube, tape & reel (TR), and cut tape (CT) & Digi-Reel formats. Selection depends on assembly method and production volume requirements.

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