AT24C64D-MAPD-E Equivalent & Substitute Parts

Part Overview

The AT24C64D-MAPD-E is a 64Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface communication at 400 kHz with 900 ns access time. This component is classified as Active product status and meets AEC-Q100 automotive qualification standards. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the same memory capacity, interface protocol, and package form factor.

Key Parameters

Parameter	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 ~ 125°C
Package Type	8-UFDFN Exposed Pad
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the AT24C64D-MAPD-E are qualified based on the following criteria:

Memory capacity of 64Kbit with 8K x 8 organization
I2C serial interface protocol compatibility
8-pin UFDFN surface mount package with exposed pad
Non-volatile EEPROM technology
5ms page write cycle time
ROHS3 compliance and EAR99 export classification

The STMicroelectronics M24C64 series parts (M24C64-DFMC6TG and M24C64-FMC6TG) meet these core substitution criteria. Differences in clock frequency (1 MHz vs. 400 kHz), access time (450 ns vs. 900 ns), voltage supply floor (1.7V vs. 2.5V), and operating temperature ceiling (85°C vs. 125°C) represent enhanced or extended capabilities that do not prevent functional substitution in applications designed for the AT24C64D-MAPD-E.

Parameter Comparison

Parameter	AT24C64D-MAPD-E	M24C64-DFMC6TG	M24C64-FMC6TG
Manufacturer	Microchip Technology	STMicroelectronics	STMicroelectronics
Memory Size	64Kbit	64Kbit	64Kbit
Memory Organization	8K x 8	8K x 8	8K x 8
Memory Interface	I2C	I2C	I2C
Clock Frequency	400 kHz	1 MHz	1 MHz
Access Time	900 ns	450 ns	450 ns
Write Cycle Time	5ms	5ms	5ms
Voltage Supply Range	2.5V ~ 5.5V	1.7V ~ 5.5V	1.7V ~ 5.5V
Operating Temperature	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	8-UFDFN Exposed Pad	8-UFDFN Exposed Pad	8-UFDFN Exposed Pad
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Both M24C64-DFMC6TG and M24C64-FMC6TG are Active product status components from STMicroelectronics with ROHS3 compliance and EAR99 export classification, matching the regulatory posture of the AT24C64D-MAPD-E. The primary distinction between substitute options is packaging format: M24C64-DFMC6TG is supplied in Tape & Reel (TR) configuration, while M24C64-FMC6TG is available in Cut Tape (CT) & Digi-Reel® format. Selection between these substitutes depends on procurement volume and assembly line requirements rather than electrical performance.

The AT24C64D-MAPD-E maintains automotive-grade qualification (AEC-Q100) and extended temperature range (-40°C ~ 125°C), which are not specified for the M24C64 substitutes. Applications requiring automotive qualification or operation above 85°C must retain the original AT24C64D-MAPD-E specification.

Frequently Asked Questions (FAQ)

Q: Can M24C64-DFMC6TG or M24C64-FMC6TG be used in place of AT24C64D-MAPD-E in all applications?

A: Functional substitution is valid for applications operating within the M24C64 parameter envelope (1.7V ~ 5.5V supply, -40°C ~ 85°C temperature range, 1 MHz I2C clock). Applications requiring AEC-Q100 automotive qualification or extended temperature operation above 85°C must use the original AT24C64D-MAPD-E.

Q: What is the difference between M24C64-DFMC6TG and M24C64-FMC6TG?

A: Both parts are electrically identical 64Kbit I2C EEPROM devices with the same performance specifications. The difference is packaging format: M24C64-DFMC6TG uses Tape & Reel (TR) packaging, while M24C64-FMC6TG uses Cut Tape (CT) & Digi-Reel® packaging. Selection depends on assembly process requirements and order quantities.

Q: Are the 8-UFDFN packages of all three parts mechanically compatible?

A: Yes. All three parts use 8-pin UFDFN surface mount packages with exposed pad, ensuring mechanical and footprint compatibility on PCB assemblies.

Q: What is the impact of the faster clock frequency (1 MHz) in the M24C64 substitutes?

A: The M24C64 series supports 1 MHz I2C clock operation compared to 400 kHz for the AT24C64D-MAPD-E. This represents enhanced performance capability. I2C bus design must accommodate the faster clock speed; however, I2C protocol allows devices to operate at lower clock frequencies, so M24C64 parts function correctly on 400 kHz buses.

Q: Does the lower MSL rating of M24C64 parts affect suitability?

A: MSL (Moisture Sensitivity Level) 1 (Unlimited) for M24C64 parts is superior to MSL 3 (168 Hours) for AT24C64D-MAPD-E. Lower MSL ratings indicate reduced moisture sensitivity and longer shelf life, presenting no compatibility concern for substitution.

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