AT24C64C-TH-B Equivalent & Substitute Parts

Part Overview

The AT24C64C-TH-B 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, supporting supply voltages from 1.8V to 5.5V across an operating temperature range of -40°C to 85°C. The device is packaged in 8-TSSOP surface mount configuration and is ROHS3 compliant.

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

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	5ms
Voltage Supply Range	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-TSSOP
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

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

Memory capacity: 64Kbit with 8K x 8 organization
Interface protocol: I2C communication standard
Package type: 8-TSSOP surface mount form factor
Supply voltage compatibility: Minimum 1.8V support required
Operating temperature range: Minimum -40°C to 85°C support required
Write cycle time: 5ms specification
RoHS compliance: ROHS3 standard

Substitute parts must maintain these core specifications. Clock frequency and access time may vary within acceptable operational parameters, as the I2C protocol accommodates multiple frequency classes. Parts with extended temperature ranges or higher clock frequencies are functionally compatible and represent direct substitutes.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temperature	Package	Product Status
AT24C64C-TH-B	Microchip Technology	64Kbit	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Obsolete
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
24AA64-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
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
24FC64-I/ST	Microchip Technology	64Kbit	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24FC64F-I/ST	Microchip Technology	64Kbit	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active

Engineering Selection Recommendations

All listed substitute parts are manufactured by Microchip Technology and maintain ROHS3 compliance and REACH unaffected status consistent with the AT24C64C-TH-B.

For applications requiring 1 MHz clock frequency performance matching the original part, select 24FC64-I/ST or 24FC64F-I/ST. Both parts deliver 1 MHz operation with improved 400 ns access time and are actively produced.

For applications tolerant of 400 kHz I2C operation, the 24AA64 series provides multiple options across different packaging formats and temperature ratings. The 24AA64-E/ST and 24AA64T-E/ST extend the upper operating temperature to 125°C, suitable for elevated thermal environments. The 24AA64X-I/ST and 24AA64XT-I/ST maintain the 1.8V minimum supply voltage specification of the original part.

All substitute parts are actively produced and available in production quantities, eliminating obsolescence risk associated with the AT24C64C-TH-B.

Frequently Asked Questions (FAQ)

Q: Can 24AA64 series parts replace AT24C64C-TH-B in existing designs?

A: Yes. The 24AA64 series maintains 64Kbit capacity, 8K x 8 organization, I2C interface, 5ms write cycle time, and 8-TSSOP packaging. The reduced clock frequency from 1 MHz to 400 kHz is compatible with I2C protocol specifications. Designs operating at 400 kHz I2C bus speed experience no functional difference.

Q: What is the difference between 24AA64-E/ST and 24AA64-I/ST?

A: Both parts are electrically identical with 64Kbit capacity, 400 kHz operation, and 8-TSSOP packaging. The primary difference is operating temperature range: 24AA64-E/ST supports -40°C to 125°C, while 24AA64-I/ST supports -40°C to 85°C. Select based on application thermal requirements.

Q: Are 24FC64-I/ST and 24FC64F-I/ST interchangeable?

A: Yes. Both parts deliver identical electrical specifications: 64Kbit capacity, 1 MHz clock frequency, 400 ns access time, 1.7V to 5.5V supply range, -40°C to 85°C operating temperature, and 8-TSSOP packaging. Selection between them depends on packaging format availability and supplier inventory.

Q: Does packaging format affect substitution compatibility?

A: Packaging format (Tube versus Tape & Reel) does not affect electrical compatibility. The 8-TSSOP package dimensions and pinout remain identical across all listed parts. Selection between packaging formats depends on assembly process requirements and order quantities.

Q: Which substitute part best matches the AT24C64C-TH-B specifications?

A: The 24FC64F-I/ST provides the closest electrical match with 1 MHz clock frequency and 400 ns access time, both superior to the original 550 ns specification. For applications requiring exact 1 MHz operation, this part is the direct functional equivalent.

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