AT24C64CN-SH-T EEPROM 64Kbit I2C Memory - Equivalent & Substitute Parts

Part Overview

The AT24C64CN-SH-T is a 64Kbit EEPROM memory IC with I2C interface manufactured by Microchip Technology. This device 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 part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts maintain the core 64Kbit EEPROM architecture with I2C interface while offering active product status and extended availability.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile EEPROM
Memory Size	64Kbit
Memory Organization	8K x 8
Memory Interface	I2C
Clock Frequency	1 MHz
Access Time	550 ns
Write Cycle Time	5 ms
Voltage Supply Range	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the AT24C64CN-SH-T is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Memory Size: 64Kbit (8K x 8 organization)
Memory Interface: I2C protocol
Package Type: 8-SOIC form factor
Voltage Supply Range: Minimum 1.8V, Maximum 5.5V
Operating Temperature: -40°C to 85°C minimum
RoHS Compliance: ROHS3 Compliant
Mounting Type: Surface Mount

Performance Variation Parameters: Substitute parts are grouped by clock frequency capability. The AT24C64CN-SH-T operates at 1 MHz with 550 ns access time. Substitute parts fall into two categories:

1 MHz Devices (24FC64 series): Maintain 1 MHz clock frequency with improved 400 ns access time, providing direct performance equivalence or enhancement.
400 kHz Devices (24AA64 series): Operate at reduced 400 kHz clock frequency with 900 ns access time. These parts are electrically compatible but operate at lower speed specifications.

All substitute parts maintain identical memory capacity, I2C interface, 8-SOIC packaging, and compliance certifications. Substitution is valid when the application's I2C bus speed requirements do not exceed the substitute part's maximum clock frequency.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temp	Package	Product Status	Inventory
AT24C64CN-SH-T	Microchip Technology	64Kbit	1 MHz	550 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Obsolete	5754 Pcs
24AA64F-I/SN	Microchip Technology	64Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	2071 Pcs
24AA64-E/SN	Microchip Technology	64Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Active	1749 Pcs
24AA64FT-I/SN	Microchip Technology	64Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	7164 Pcs
24AA64T-E/SN	Microchip Technology	64Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Active	2096 Pcs
24AA64T-I/SN	Microchip Technology	64Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	15585 Pcs
24AA64T-I/SNG	Microchip Technology	64Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	1069 Pcs
24FC64-I/SN	Microchip Technology	64Kbit	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	1237 Pcs
24FC64F-I/SN	Microchip Technology	64Kbit	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	2283 Pcs
24FC64FT-I/SN	Microchip Technology	64Kbit	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	4203 Pcs
24FC64T-I/SN	Microchip Technology	64Kbit	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	7000 Pcs

Engineering Selection Recommendations

Primary Substitutes (1 MHz Performance Class):

The 24FC64 series (24FC64-I/SN, 24FC64F-I/SN, 24FC64FT-I/SN, 24FC64T-I/SN) provides direct functional equivalence to the AT24C64CN-SH-T. These parts maintain 1 MHz clock frequency operation with improved 400 ns access time, identical 64Kbit capacity, I2C interface, and 8-SOIC packaging. All are active products with ROHS3 compliance and unlimited moisture sensitivity rating. Selection among these variants depends on packaging format: tube (24FC64-I/SN, 24FC64F-I/SN), tape & reel (24FC64FT-I/SN), or cut tape & Digi-Reel (24FC64T-I/SN).

Secondary Substitutes (400 kHz Performance Class):

The 24AA64 series (24AA64F-I/SN, 24AA64-E/SN, 24AA64FT-I/SN, 24AA64T-E/SN, 24AA64T-I/SN, 24AA64T-I/SNG) operates at 400 kHz clock frequency with 900 ns access time. These parts are suitable for applications where I2C bus speed does not exceed 400 kHz. All maintain 64Kbit capacity, I2C interface, and 8-SOIC packaging with ROHS3 compliance. The 24AA64-E/SN and 24AA64T-E/SN variants support extended operating temperature to 125°C. Inventory availability is significantly higher in this series, with 24AA64T-I/SN offering 15,585 pieces in stock.

Selection Criteria:

For applications requiring 1 MHz I2C operation, select from the 24FC64 series.
For applications operating at 400 kHz or lower I2C speeds, the 24AA64 series provides cost-effective alternatives with higher availability.
For extended temperature operation beyond 85°C, select 24AA64-E/SN or 24AA64T-E/SN (rated to 125°C).
Packaging format selection (tube, tape & reel, or cut tape) depends on assembly process requirements.

Frequently Asked Questions (FAQ)

Q: Can I use a 24AA64 series part as a direct replacement for AT24C64CN-SH-T?

A: The 24AA64 series is electrically compatible but operates at 400 kHz instead of 1 MHz. Substitution is valid only if your I2C bus speed does not exceed 400 kHz. If your application requires 1 MHz operation, use the 24FC64 series instead.

Q: What is the difference between 24FC64-I/SN and 24FC64FT-I/SN?

A: Both parts are electrically identical with 1 MHz clock frequency and 400 ns access time. The difference is packaging format: 24FC64-I/SN is supplied in tube packaging, while 24FC64FT-I/SN is supplied in tape & reel format. Select based on your assembly process requirements.

Q: Why do some substitute parts have lower voltage supply minimum (1.7V vs 1.8V)?

A: The 24AA64 and 24FC64 series specify 1.7V minimum supply voltage, which is lower than the AT24C64CN-SH-T specification of 1.8V. This represents an expanded operating range and does not affect compatibility in applications designed for 1.8V to 5.5V operation.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all substitute parts listed are ROHS3 compliant and REACH unaffected, matching the compliance status of the AT24C64CN-SH-T.

Q: What does MSL (Moisture Sensitivity Level) mean for component selection?

A: MSL indicates moisture sensitivity during storage and handling. MSL 1 (unlimited) means no moisture precautions are required. MSL 3 (168 hours) requires controlled storage conditions. For most applications, either rating is acceptable, but MSL 1 parts offer simpler handling and storage requirements.

Q: Can I mix different substitute parts in the same design?

A: Yes, all substitute parts maintain identical memory capacity, I2C interface, and 8-SOIC packaging. However, ensure your I2C bus speed accommodates the slowest part used. If mixing 1 MHz and 400 kHz devices, the bus must operate at 400 kHz or lower.

Q: Which substitute part has the highest inventory availability?

A: The 24AA64T-I/SN offers the highest inventory with 15,585 pieces in stock. For 1 MHz operation, 24FC64T-I/SN provides 7,000 pieces in stock.

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