Microchip Technology 24LC044-I/SN EEPROM Equivalent & Substitute Parts

Part Overview

The Microchip Technology 24LC044-I/SN is a 4Kbit I2C EEPROM memory IC in 8-SOIC surface mount packaging. This non-volatile memory device operates at 1 MHz clock frequency with a supply voltage range of 2.5V to 5.5V and temperature range of -40°C to 85°C. The device is ROHS3 compliant and currently in active production status. Equivalent and substitute parts are identified when design requirements change, inventory constraints occur, or alternative performance specifications become acceptable within system parameters.

Key Parameters

Parameter	Value
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-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 24LC044-I/SN is determined by the following critical parameters: memory size (4Kbit), memory organization (256 x 8 x 2), I2C interface protocol, package type (8-SOIC), and surface mount mounting type. All identified substitute parts maintain these core specifications. Secondary parameters including clock frequency, access time, voltage supply range, and operating temperature range may vary within acceptable limits for system compatibility. Substitute parts are grouped based on clock frequency performance: 1 MHz operation (direct equivalents) and 400 kHz operation (reduced-speed alternatives).

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temperature	Package	Inventory (Pcs)
24LC044-I/SN	Microchip Technology	4Kbit	1 MHz	—	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	985
24AA044-I/SN	Microchip Technology	4Kbit	1 MHz	400 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	4530
24AA04-I/SN	Microchip Technology	4Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	1238
24LC04B-I/SN	Microchip Technology	4Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	4540
24LC04B-E/SN	Microchip Technology	4Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	1670
24LC04BH-I/SN	Microchip Technology	4Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	3100

Engineering Selection Recommendations

Direct Equivalent (1 MHz Operation): The 24AA044-I/SN provides identical 1 MHz clock frequency performance with improved voltage supply range (1.7V minimum versus 2.5V). This part is manufacturer-recommended and verified for programmability. Higher inventory availability (4530 units) supports production requirements.

Reduced-Speed Alternatives (400 kHz Operation): The 24LC04B-I/SN, 24LC04B-E/SN, and 24LC04BH-I/SN operate at 400 kHz clock frequency. These parts are suitable for applications where reduced I2C bus speed is acceptable. The 24LC04B-E/SN extends operating temperature to 125°C, supporting high-temperature environments. All three variants maintain ROHS3 compliance and active product status.

Lower Voltage Supply Option: The 24AA04-I/SN supports minimum supply voltage of 1.7V, enabling operation in low-power applications. This part operates at 400 kHz and is manufacturer-recommended with verified programmability.

All substitute parts maintain identical 4Kbit memory capacity, 256 x 8 x 2 organization, I2C interface, and 8-SOIC packaging. Selection depends on clock frequency requirements, voltage supply constraints, and operating temperature specifications of the target application.

Frequently Asked Questions (FAQ)

Q: Can 24AA044-I/SN replace 24LC044-I/SN in all applications? A: Yes, the 24AA044-I/SN is a direct equivalent with identical 1 MHz clock frequency and matching memory specifications. The lower minimum supply voltage (1.7V versus 2.5V) provides additional design flexibility.

Q: What is the primary difference between 1 MHz and 400 kHz variants? A: Clock frequency determines I2C bus speed. The 1 MHz variants (24LC044-I/SN and 24AA044-I/SN) support faster data transfer rates. The 400 kHz variants (24LC04B series and 24AA04-I/SN) operate at reduced speed. Selection depends on system I2C bus configuration and timing requirements.

Q: Are all substitute parts pin-compatible? A: Yes, all listed parts use identical 8-SOIC packaging (0.154", 3.90mm width) with matching pinout for I2C interface operation.

Q: Which substitute part supports the highest operating temperature? A: The 24LC04B-E/SN operates to 125°C maximum, compared to 85°C for other variants. This part is suitable for high-temperature industrial applications.

Q: Do all parts meet RoHS3 compliance? A: Yes, all listed parts are ROHS3 compliant with MSL rating of 1 (Unlimited moisture sensitivity level).

Q: What is the write cycle time for these EEPROM devices? A: The specified write cycle time is 5ms for all substitute parts where this parameter is provided.

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