24LC044-I/MS EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24LC044-I/MS is a 4Kbit I2C EEPROM memory IC manufactured by Microchip Technology, operating at 1 MHz clock frequency in an 8-MSOP surface mount package. This non-volatile memory device is actively produced and widely used in embedded systems requiring low-power serial memory storage. Substitute parts are identified based on matching memory capacity, interface protocol, package type, and electrical operating parameters to ensure direct functional compatibility in circuit applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	24LC044-I/MS
Manufacturer	Microchip Technology
Memory Size	4Kbit
Memory Organization	256 x 8 x 2
Memory Interface	I2C
Clock Frequency	1 MHz
Voltage Supply Range	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-MSOP (0.118", 3.00mm Width)
Mounting Type	Surface Mount
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 24LC044-I/MS are qualified based on the following critical parameters:

Core Compatibility Criteria:

Memory capacity: 4Kbit (256 x 8 x 2 organization)
Interface protocol: I2C serial communication
Package type: 8-MSOP surface mount
Voltage supply range: Must encompass or be compatible with 2.5V ~ 5.5V
Operating temperature range: Must support -40°C minimum and 85°C minimum upper limit
Mounting type: Surface mount only
Product status: Active manufacturing status

Substitution Logic: The 24LC044-I/MS operates at 1 MHz I2C clock frequency. Substitute parts may operate at lower clock frequencies (400 kHz) while maintaining full backward compatibility, as slower clock speeds do not prevent operation in circuits designed for higher frequencies. All substitute parts maintain identical memory capacity, organization, and package specifications. Voltage supply ranges may vary; substitutes with wider voltage ranges (1.7V ~ 5.5V) provide enhanced flexibility for multi-voltage applications.

Parameter Comparison

Parameter	24LC044-I/MS	24AA04-I/MS	24AA044-I/MS	24LC04B-E/MS	24LC04B-I/MS
Memory Size	4Kbit	4Kbit	4Kbit	4Kbit	4Kbit
Memory Organization	256 x 8 x 2	256 x 8 x 2	256 x 8 x 2	256 x 8 x 2	256 x 8 x 2
Memory Interface	I2C	I2C	I2C	I2C	I2C
Clock Frequency	1 MHz	400 kHz	1 MHz	400 kHz	400 kHz
Access Time	—	900 ns	400 ns	900 ns	900 ns
Write Cycle Time	—	5ms	5ms	5ms	5ms
Voltage Supply Range	2.5V ~ 5.5V	1.7V ~ 5.5V	1.7V ~ 5.5V	2.5V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C
Package Type	8-MSOP	8-MSOP	8-MSOP	8-MSOP	8-MSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts maintain active product status and ROHS3 compliance, ensuring continued availability and environmental regulatory adherence. Selection between substitute options depends on specific application requirements:

24AA04-I/MS and 24LC04B-I/MS: Both operate at 400 kHz clock frequency with 900 ns access time. The 24AA04-I/MS provides extended voltage supply range (1.7V ~ 5.5V), suitable for low-voltage applications. The 24LC04B-I/MS maintains the same voltage range as the primary part (2.5V ~ 5.5V).

24AA044-I/MS: Matches the 1 MHz clock frequency of the primary part while offering extended voltage supply range (1.7V ~ 5.5V) and faster access time (400 ns). This part provides performance parity with enhanced low-voltage capability.

24LC04B-E/MS: Operates at 400 kHz with extended operating temperature range (-40°C ~ 125°C), providing thermal margin beyond the primary part's specification.

All substitute parts are manufactured by Microchip Technology, use identical 8-MSOP packaging, and maintain the same memory capacity and I2C interface protocol as the 24LC044-I/MS.

Frequently Asked Questions (FAQ)

Q: Can 24AA04-I/MS replace 24LC044-I/MS in all applications? A: The 24AA04-I/MS is functionally compatible as a substitute. It operates at 400 kHz instead of 1 MHz, which is acceptable in I2C systems designed for the primary part, as lower clock speeds do not prevent operation. The extended voltage range (1.7V ~ 5.5V) provides additional flexibility. Both parts share identical memory capacity, organization, and 8-MSOP packaging.

Q: What is the difference between 24AA044-I/MS and 24LC044-I/MS? A: Both parts operate at 1 MHz clock frequency with identical memory specifications and 8-MSOP packaging. The 24AA044-I/MS offers extended voltage supply range (1.7V ~ 5.5V versus 2.5V ~ 5.5V) and faster access time (400 ns versus unspecified). The 24AA044-I/MS is suitable for applications requiring lower voltage operation.

Q: Are all substitute parts available in the same package? A: Yes. All listed substitute parts use the 8-MSOP surface mount package with 0.118" width and 3.00mm body width, ensuring direct pin-compatible replacement on PCBs designed for the 24LC044-I/MS.

Q: Can I use 24LC04B-E/MS in applications requiring -40°C ~ 85°C operation? A: Yes. The 24LC04B-E/MS operates across -40°C ~ 125°C, which exceeds the -40°C ~ 85°C requirement. This part provides thermal margin and is suitable for such applications.

Q: What is the impact of using a 400 kHz part instead of 1 MHz? A: I2C bus speed is determined by the master controller and pull-up resistor configuration. A 400 kHz EEPROM operates correctly on buses designed for 1 MHz operation, as the device simply responds to the slower clock rate. No circuit modification is required.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts carry ROHS3 compliance certification, meeting environmental and regulatory requirements equivalent to the primary part.

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