24AA04HT-I/MS EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24AA04HT-I/MS is a 4Kbit I2C EEPROM memory integrated circuit manufactured by Microchip Technology. This non-volatile memory device operates at 400 kHz clock frequency with 900 ns access time and is housed in an 8-MSOP surface mount package. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity level rating.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified operating parameters. Alternative sources may be required due to inventory availability, lead time considerations, or design flexibility requirements.

Key Parameters

Parameter	Value
Memory Size	4Kbit
Memory Organization	256 x 8 x 2
Memory Interface	I2C
Clock Frequency	400 kHz
Access Time	900 ns
Write Cycle Time	5 ms
Voltage Supply Range	1.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-MSOP (0.118", 3.00mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 24AA04HT-I/MS is determined by the following critical parameters:

Memory Capacity & Organization: All substitute parts must provide 4Kbit total memory capacity with I2C interface compatibility. Memory organization may vary (256 x 8 x 2 or 512 x 8) provided total capacity remains 4Kbit.

Interface Compatibility: I2C protocol support is mandatory. Clock frequency must support the 400 kHz minimum operational requirement of the main part.

Electrical Specifications: Supply voltage range must encompass or exceed 1.7V ~ 5.5V. Operating temperature range must cover -40°C ~ 85°C minimum.

Package & Mounting: Surface mount 8-pin packages with compatible pinout and mechanical dimensions are acceptable. MSOP and VSSOP variants with equivalent lead spacing are interchangeable.

Compliance & Certifications: ROHS3 compliance and MSL Level 1 rating are required for direct substitution.

Parameter Comparison

Parameter	24AA04HT-I/MS (Main)	24AA044T-I/MS	BR24G04FVM-3AGTTR
Manufacturer	Microchip Technology	Microchip Technology	Rohm Semiconductor
Memory Size	4Kbit	4Kbit	4Kbit
Memory Organization	256 x 8 x 2	256 x 8 x 2	512 x 8
Memory Interface	I2C	I2C	I2C
Clock Frequency	400 kHz	1 MHz	1 MHz
Access Time	900 ns	400 ns	Not Specified
Write Cycle Time	5 ms	5 ms	5 ms
Voltage Supply Range	1.7V ~ 5.5V	1.7V ~ 5.5V	1.6V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	8-MSOP (0.118", 3.00mm)	8-MSOP (0.118", 3.00mm)	8-VSSOP/8-MSOP (0.110", 2.80mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	Level 1 (Unlimited)	Level 1 (Unlimited)	Level 1 (Unlimited)

Engineering Selection Recommendations

24AA044T-I/MS (Microchip Technology): This part is manufacturer-recommended as a direct substitute. It maintains identical supply voltage range, operating temperature, write cycle time, and package dimensions. The increased clock frequency (1 MHz) and improved access time (400 ns) provide enhanced performance while maintaining full backward compatibility. Both parts are ROHS3 compliant with Level 1 MSL rating and active production status.

BR24G04FVM-3AGTTR (Rohm Semiconductor): This alternative source provides equivalent 4Kbit I2C EEPROM functionality with 1 MHz clock frequency support. The supply voltage range (1.6V ~ 5.5V) extends lower voltage operation capability. Package dimensions differ slightly (0.110" vs 0.118" width), requiring PCB layout verification. ROHS3 compliance and Level 1 MSL rating are maintained. This option is suitable when Microchip sourcing is constrained.

All three parts maintain active production status and meet the specified compliance requirements for direct component selection.

Frequently Asked Questions (FAQ)

Q: Can 24AA044T-I/MS replace 24AA04HT-I/MS in existing designs?

A: Yes. The 24AA044T-I/MS is a manufacturer-recommended substitute with identical package dimensions, supply voltage range, and operating temperature. The higher clock frequency (1 MHz vs 400 kHz) and faster access time (400 ns vs 900 ns) are backward compatible with designs specified for the 24AA04HT-I/MS.

Q: What are the key differences between Microchip and Rohm alternatives?

A: Both manufacturers provide 4Kbit I2C EEPROM devices with equivalent memory capacity and interface. The Rohm BR24G04FVM-3AGTTR offers extended lower voltage operation (1.6V minimum) and operates at 1 MHz. Package width differs by 0.008" (0.110" vs 0.118"), which may affect PCB routing in space-constrained layouts.

Q: Are memory organization differences significant for substitution?

A: The 24AA04HT-I/MS and 24AA044T-I/MS both use 256 x 8 x 2 organization, while BR24G04FVM-3AGTTR uses 512 x 8 organization. Both configurations deliver 4Kbit total capacity and are functionally equivalent for I2C EEPROM applications. Address mapping and page write operations remain compatible.

Q: Do all substitute parts meet the same compliance standards?

A: Yes. All three parts are ROHS3 compliant, carry Level 1 MSL rating (unlimited moisture sensitivity), and maintain active production status. REACH and ECCN classifications are identical across all options.

Q: What considerations apply to package selection?

A: The 24AA04HT-I/MS and 24AA044T-I/MS use identical 8-MSOP packages (0.118" width). The BR24G04FVM-3AGTTR uses 8-VSSOP/8-MSOP variant (0.110" width). PCB footprint compatibility must be verified before substitution, particularly for high-density layouts where the 0.008" width difference may impact trace routing.

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