24AA04H-I/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24AA04H-I/ST is a 4Kbit I2C EEPROM memory IC manufactured by Microchip Technology, packaged in 8-TSSOP surface mount configuration. This non-volatile memory device operates at 400 kHz I2C clock frequency with 900 ns access time and supports a supply voltage range of 1.7V to 5.5V. The device is Active product status and ROHS3 compliant. Substitute parts are identified when equivalent memory capacity, interface protocol, and package specifications are required but the original part number is unavailable or when performance enhancements such as increased clock frequency or faster access time are acceptable within system design parameters.

Key Parameters

Parameter	24AA04H-I/ST
Memory Size	4Kbit
Memory Format	EEPROM
Memory Organization	256 x 8 x 2
Interface	I2C
Clock Frequency	400 kHz
Access Time	900 ns
Write Cycle Time	5 ms
Supply Voltage	1.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package	8-TSSOP
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 24AA04H-I/ST are classified into two categories based on electrical and mechanical compatibility:

MFR Recommended Substitutes maintain identical memory capacity (4Kbit), I2C interface protocol, 8-TSSOP package, and operating temperature range while offering enhanced performance specifications. These parts are direct functional replacements with improved or equivalent electrical characteristics.

Parametric Equivalents provide identical core electrical specifications (4Kbit memory, I2C interface, 400 kHz clock frequency, 900 ns access time, 1.7V ~ 5.5V supply voltage) and identical package form factor. These parts are functionally interchangeable with the original device.

Substitution eligibility is determined by the following key parameters:

Memory Size: 4Kbit (mandatory)
Memory Interface: I2C (mandatory)
Package Type: 8-TSSOP (mandatory)
Supply Voltage Range: Must encompass or be compatible with 1.7V ~ 5.5V
Operating Temperature: -40°C ~ 85°C (mandatory)
Clock Frequency: 400 kHz minimum acceptable
Access Time: 900 ns maximum acceptable

Parameter Comparison

Parameter	24AA04H-I/ST	24AA044-I/ST	AT24HC04B-TH-B	AT24HC04B-TH-T	24AA04-I/ST	CAT24C04YI-G
Manufacturer	Microchip	Microchip	Microchip	Microchip	Microchip	Catalyst Semiconductor
Memory Size	4Kbit	4Kbit	4Kbit	4Kbit	4Kbit	4Kbit
Memory Organization	256 x 8 x 2	256 x 8 x 2	512 x 8	512 x 8	256 x 8 x 2	512 x 8
Clock Frequency	400 kHz	1 MHz	1 MHz	1 MHz	400 kHz	400 kHz
Access Time	900 ns	400 ns	550 ns	550 ns	900 ns	900 ns
Write Cycle Time	5 ms	5 ms	5 ms	5 ms	5 ms	5 ms
Supply Voltage	1.7V ~ 5.5V	1.7V ~ 5.5V	1.8V ~ 5.5V	1.8V ~ 5.5V	1.7V ~ 5.5V	1.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

24AA044-I/ST is a MFR recommended substitute offering enhanced clock frequency (1 MHz) and faster access time (400 ns) compared to the original 24AA04H-I/ST. Both devices maintain identical supply voltage range (1.7V ~ 5.5V), operating temperature (-40°C ~ 85°C), and 8-TSSOP package. This part is suitable for applications requiring improved I2C communication speed while maintaining full backward compatibility with the original device footprint and pinout.

AT24HC04B-TH-B and AT24HC04B-TH-T are MFR recommended substitutes from Microchip's AT24HC04 series. Both provide 1 MHz clock frequency and 550 ns access time. The primary difference is packaging format: AT24HC04B-TH-B is supplied in Tube packaging, while AT24HC04B-TH-T is supplied in Tape & Reel format. Both are verified for DiGi-Electronics programmability. Supply voltage range is 1.8V ~ 5.5V, which is compatible with systems operating at or above 1.8V. These parts are suitable for high-volume production applications requiring tape and reel packaging.

24AA04-I/ST is a parametric equivalent maintaining identical electrical specifications to the 24AA04H-I/ST: 400 kHz clock frequency, 900 ns access time, 1.7V ~ 5.5V supply voltage, and 256 x 8 x 2 memory organization. This part is suitable for direct replacement in applications where the original part number is unavailable.

CAT24C04YI-G is a parametric equivalent from Catalyst Semiconductor Inc. providing identical clock frequency (400 kHz) and access time (900 ns) specifications. This part maintains 1.7V ~ 5.5V supply voltage compatibility and -40°C ~ 85°C operating temperature range. The device is supplied in Bulk packaging format. This part is suitable for applications where cross-manufacturer sourcing is acceptable.

Frequently Asked Questions (FAQ)

Q: Can I substitute 24AA044-I/ST for 24AA04H-I/ST in my design?

A: Yes. The 24AA044-I/ST is a direct functional replacement with enhanced performance. It maintains identical package (8-TSSOP), supply voltage range (1.7V ~ 5.5V), operating temperature (-40°C ~ 85°C), and I2C interface. The higher clock frequency (1 MHz vs 400 kHz) and faster access time (400 ns vs 900 ns) are backward compatible with systems designed for the original device.

Q: What is the difference between AT24HC04B-TH-B and AT24HC04B-TH-T?

A: Both parts are electrically identical with 1 MHz clock frequency and 550 ns access time. The difference is packaging format: AT24HC04B-TH-B is supplied in Tube packaging for lower-volume applications, while AT24HC04B-TH-T is supplied in Tape & Reel format for high-volume production. AT24HC04B-TH-T has MSL rating of 3 (168 Hours) compared to MSL 1 (Unlimited) for AT24HC04B-TH-B.

Q: Is CAT24C04YI-G compatible with my 1.7V supply voltage requirement?

A: Yes. The CAT24C04YI-G supports 1.7V ~ 5.5V supply voltage range, matching the original 24AA04H-I/ST specification. This part is suitable for low-voltage applications.

Q: Can I use a substitute part with higher clock frequency in a 400 kHz I2C system?

A: Yes. Parts with higher clock frequency ratings (such as 24AA044-I/ST or AT24HC04B series at 1 MHz) are backward compatible with 400 kHz I2C systems. The I2C bus will operate at the lower frequency determined by the system master controller.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance matching the original 24AA04H-I/ST specification.

Q: What is the memory organization difference between 256 x 8 x 2 and 512 x 8?

A: Both configurations provide 4Kbit total memory capacity. The 256 x 8 x 2 organization uses two 256-byte pages, while 512 x 8 uses a single 512-byte page. Both are functionally compatible for I2C EEPROM applications with identical addressing and access protocols.

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