Equivalent & Substitute Parts for 24LC044-I/ST

Part Overview

The 24LC044-I/ST is a 4Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface operation at 1 MHz clock frequency in an 8-TSSOP surface mount package. This device is classified as Active product status and is ROHS3 compliant. Substitute parts are necessary when addressing supply constraints, extended temperature range requirements, or alternative clock frequency specifications while maintaining functional compatibility within I2C-based memory applications.

Key Parameters

Parameter	24LC044-I/ST
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 / Case	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 24LC044-I/ST is determined by the following critical parameters:

Memory Capacity & Organization: All substitute parts must maintain 4Kbit capacity with 256 x 8 x 2 organization to ensure address space and data width compatibility.
Memory Interface: I2C protocol compatibility is mandatory; all substitutes operate via I2C interface.
Package & Mounting: All substitutes use 8-TSSOP surface mount package with identical 0.173" (4.40mm) width to ensure PCB footprint compatibility.
Voltage Supply Range: Substitutes must support the operating voltage window of the main part or provide a superset range.
Operating Temperature: Substitutes must cover the -40°C ~ 85°C range minimum; extended temperature variants are acceptable.
Clock Frequency: Substitutes operating at 400 kHz or 1 MHz are functionally compatible; 1 MHz variants provide direct speed matching.

Parameter Comparison

Parameter	24LC044-I/ST	24AA04-I/ST	24AA044-I/ST	24LC04B-E/ST	24LC04B-I/ST
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 / Case	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (1 MHz Clock Frequency Match):

24AA044-I/ST: Provides identical 1 MHz clock frequency operation with extended lower voltage support (1.7V minimum). Suitable for applications requiring faster I2C bus operation and lower supply voltage tolerance. Product status is Active with ROHS3 compliance.

Functional Substitutes (400 kHz Clock Frequency):

24LC04B-I/ST: Operates at 400 kHz with matching voltage range (2.5V ~ 5.5V) and temperature range (-40°C ~ 85°C). Verified programmable status. Suitable for standard I2C bus speeds with equivalent electrical specifications.
24LC04B-E/ST: Operates at 400 kHz with extended operating temperature range (-40°C ~ 125°C). Verified programmable status. Recommended for applications requiring higher temperature operation beyond 85°C.

Lower Voltage Capable Substitute:

24AA04-I/ST: Operates at 400 kHz with extended lower voltage support (1.7V minimum). Suitable for low-power applications requiring reduced supply voltage operation.

All substitute parts maintain ROHS3 compliance, REACH unaffected status, and identical 8-TSSOP package specifications, ensuring PCB-level compatibility with the 24LC044-I/ST.

Frequently Asked Questions (FAQ)

Q: Can 24LC04B-I/ST replace 24LC044-I/ST in existing designs? A: Yes. Both parts share identical voltage supply range (2.5V ~ 5.5V), operating temperature range (-40°C ~ 85°C), and 8-TSSOP package. The primary difference is clock frequency: 24LC04B-I/ST operates at 400 kHz versus 1 MHz. This substitution is valid for applications where I2C bus speed is not constrained to 1 MHz operation.

Q: What is the difference between 24AA044-I/ST and 24LC044-I/ST? A: Both operate at 1 MHz clock frequency with identical memory organization. The 24AA044-I/ST supports lower minimum supply voltage (1.7V versus 2.5V). The 24AA series typically indicates automotive-grade qualification in Microchip nomenclature, though both are ROHS3 compliant and Active status.

Q: Is 24LC04B-E/ST suitable for high-temperature applications? A: Yes. The 24LC04B-E/ST is rated for -40°C ~ 125°C operating temperature, extending 40°C above the 24LC044-I/ST maximum. This variant is appropriate for industrial or automotive environments requiring extended temperature operation.

Q: Are all substitute parts in the same 8-TSSOP package? A: Yes. All listed substitutes use 8-TSSOP (0.173", 4.40mm Width) surface mount package, ensuring identical PCB footprint and mounting compatibility.

Q: What determines I2C bus compatibility between these parts? A: All parts implement I2C protocol with 256 x 8 x 2 memory organization. Clock frequency differences (400 kHz versus 1 MHz) do not prevent I2C communication; the bus operates at the lower of the master or slave clock specification. Voltage supply ranges must overlap with system operating voltage.

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