Equivalent & Substitute Parts for 24AA04HT-I/ST

Part Overview

The 24AA04HT-I/ST is a 4Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface communication at 400 kHz with 900 ns access time. The device operates across a supply voltage range of 1.7V to 5.5V and maintains functionality from -40°C to 85°C. Packaged in 8-TSSOP surface mount configuration with Tape & Reel delivery, this component is actively produced and RoHS3 compliant. Substitute parts are identified to address inventory availability, packaging format requirements, or performance parameter variations while maintaining core functional compatibility.

Key Parameters

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

Substitute Part Grouping Explanation

Substitute parts are classified into two categories based on electrical parameter alignment with the 24AA04HT-I/ST:

MFR Recommended Substitutes maintain identical core memory specifications (4Kbit EEPROM, I2C interface, 8-TSSOP package) with enhanced performance characteristics. AT24HC04B-TH-B and AT24HC04B-TH-T operate at 1 MHz clock frequency with 550 ns access time, representing performance improvements over the base specification. These parts differ in packaging format (Tube versus Tape & Reel) and moisture sensitivity level.

Parametric Equivalents match the electrical performance envelope of the 24AA04HT-I/ST across all critical parameters: 4Kbit capacity, 400 kHz I2C operation, 900 ns access time, 1.7V to 5.5V supply range, and -40°C to 85°C temperature range. CAT24C04YI-GT3 (onsemi) and M24C04-FDW6TP (STMicroelectronics) provide direct functional equivalence with alternative manufacturer sourcing.

Parameter Comparison

Parameter	24AA04HT-I/ST	AT24HC04B-TH-B	AT24HC04B-TH-T	CAT24C04YI-GT3	M24C04-FDW6TP
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology	onsemi	STMicroelectronics
Memory Size	4Kbit	4Kbit	4Kbit	4Kbit	4Kbit
Memory Format	EEPROM	EEPROM	EEPROM	EEPROM	EEPROM
Memory Interface	I2C	I2C	I2C	I2C	I2C
Clock Frequency	400 kHz	1 MHz	1 MHz	400 kHz	400 kHz
Access Time	900 ns	550 ns	550 ns	900 ns	900 ns
Write Cycle Time	5ms	5ms	5ms	5ms	5ms
Voltage Supply Range	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
Package Type	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment with the 24AA04HT-I/ST.

For direct parametric replacement: CAT24C04YI-GT3 and M24C04-FDW6TP provide electrical equivalence across all specified parameters. Both maintain 400 kHz I2C operation, 900 ns access time, and 1.7V to 5.5V supply compatibility. Selection between these options depends on manufacturer sourcing preference and inventory availability.

For performance-enhanced applications: AT24HC04B-TH-B and AT24HC04B-TH-T offer 1 MHz clock frequency and 550 ns access time, enabling faster I2C communication cycles. These parts are suitable for designs where improved timing margins are beneficial. Voltage supply minimum increases to 1.8V; verify system design compatibility before selection.

For packaging format requirements: AT24HC04B-TH-B is supplied in Tube packaging, while AT24HC04B-TH-T is supplied in Tape & Reel format. The original 24AA04HT-I/ST uses Tape & Reel packaging. Select AT24HC04B-TH-T for direct packaging compatibility or AT24HC04B-TH-B if Tube format meets assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can AT24HC04B-TH-B or AT24HC04B-TH-T be used as direct replacements for 24AA04HT-I/ST?

A: Yes, both parts are functionally compatible. The AT24HC04B series operates at higher clock frequency (1 MHz versus 400 kHz) and faster access time (550 ns versus 900 ns). These performance improvements are backward compatible with designs specified for 400 kHz operation. Verify that the minimum supply voltage of 1.8V meets your system requirements, as the original part supports 1.7V minimum.

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

A: Both parts are electrically identical with identical performance specifications. The primary difference is packaging format: AT24HC04B-TH-B is supplied in Tube packaging, while AT24HC04B-TH-T is supplied in Tape & Reel format. Select based on your assembly process requirements and packaging compatibility with existing equipment.

Q: Are CAT24C04YI-GT3 and M24C04-FDW6TP true equivalents to 24AA04HT-I/ST?

A: Yes, both parts are parametric equivalents matching all critical electrical specifications: 4Kbit EEPROM, I2C interface at 400 kHz, 900 ns access time, 1.7V to 5.5V supply range, and -40°C to 85°C operating temperature. These parts provide alternative manufacturer sourcing while maintaining identical functional performance.

Q: Can I mix different substitute parts in the same design?

A: Yes, all listed substitute parts are compatible with the 24AA04HT-I/ST across the specified electrical and mechanical parameters. However, verify that your I2C address configuration and firmware accommodate any manufacturer-specific device behavior variations.

Q: What are the moisture sensitivity considerations for these parts?

A: The 24AA04HT-I/ST, CAT24C04YI-GT3, and M24C04-FDW6TP are rated MSL 1 (Unlimited moisture sensitivity level). AT24HC04B-TH-B is rated MSL 1 (Unlimited), while AT24HC04B-TH-T is rated MSL 3 (168 Hours). For applications requiring extended shelf life or high-humidity storage, prioritize MSL 1 rated parts.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all listed substitute parts are RoHS3 compliant and REACH unaffected, matching the regulatory status of the 24AA04HT-I/ST.

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