24AA08HT-I/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24AA08HT-I/ST is an 8Kbit EEPROM memory integrated circuit manufactured by Microchip Technology, designed for non-volatile data storage applications requiring I2C serial interface communication. This device operates across a wide supply voltage range of 1.7V to 5.5V and maintains active product status with full RoHS3 compliance. Substitute parts are identified when equivalent electrical specifications, memory capacity, interface protocol, and physical packaging are maintained across different manufacturers, ensuring direct functional replacement without circuit redesign.

Key Parameters

Parameter	Specification
Memory Size	8Kbit
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 (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 24AA08HT-I/ST are qualified based on strict equivalence across the following critical parameters: 8Kbit memory capacity, EEPROM non-volatile memory format, I2C serial interface protocol, 400 kHz clock frequency operation, 900 ns access time, 5ms write cycle time, 1.7V to 5.5V supply voltage compatibility, -40°C to 85°C operating temperature range, and identical 8-TSSOP surface mount packaging. All identified substitutes maintain these electrical and mechanical specifications without deviation, enabling direct pin-compatible replacement in existing circuit designs.

Parameter Comparison

Parameter	24AA08HT-I/ST (Microchip)	CAT24C08YI-GT3 (onsemi)	M24C08-FDW6TP (STMicroelectronics)
Memory Size	8Kbit	8Kbit	8Kbit
Memory Format	EEPROM	EEPROM	EEPROM
Memory Organization	256 x 8 x 4	1K x 8	1K x 8
Memory Interface	I2C	I2C	I2C
Clock Frequency	400 kHz	400 kHz	400 kHz
Access Time	900 ns	900 ns	900 ns
Write Cycle Time	5ms	5ms	5ms
Voltage Supply Range	1.7V ~ 5.5V	1.7V ~ 5.5V	1.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	8-TSSOP	8-TSSOP	8-TSSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

All three parts maintain active product status and full regulatory compliance under RoHS3 and REACH standards. The CAT24C08YI-GT3 from onsemi carries verified DiGi-Electronics programmability certification, whereas the 24AA08HT-I/ST and M24C08-FDW6TP remain unverified for this attribute. Selection between these substitutes depends on supply chain availability, packaging format preference (the 24AA08HT-I/ST is supplied in Tape & Reel format with 738 units in stock, while CAT24C08YI-GT3 offers 15,875 units in Cut Tape & Digi-Reel format, and M24C08-FDW6TP provides 4,165 units in Cut Tape & Digi-Reel format), and manufacturer preference for long-term product support continuity.

Frequently Asked Questions (FAQ)

Q: Can the CAT24C08YI-GT3 or M24C08-FDW6TP be used as direct replacements for the 24AA08HT-I/ST in existing designs?

A: Yes. All three parts share identical electrical specifications (8Kbit EEPROM, I2C interface, 400 kHz operation, 900 ns access time, 5ms write cycle), identical supply voltage range (1.7V to 5.5V), identical operating temperature range (-40°C to 85°C), and identical 8-TSSOP surface mount packaging. Pin-for-pin compatibility is maintained.

Q: What is the difference in memory organization between the 24AA08HT-I/ST (256 x 8 x 4) and the substitute parts (1K x 8)?

A: Both memory organizations represent the same 8Kbit total capacity. The 256 x 8 x 4 configuration indicates 256 bytes per page with 4 pages, while 1K x 8 indicates 1024 bytes organized as 8-bit words. Functional capacity and I2C addressing remain equivalent.

Q: Are there packaging format differences between these parts?

A: The 24AA08HT-I/ST is supplied in Tape & Reel (TR) format. The CAT24C08YI-GT3 and M24C08-FDW6TP are supplied in Cut Tape (CT) & Digi-Reel format. Both formats are suitable for automated assembly; selection depends on production volume and handling equipment compatibility.

Q: Do all three parts meet the same regulatory and compliance standards?

A: Yes. All three parts are RoHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with identical HTSUS code 8542.32.0051.

Q: What is the significance of DiGi-Electronics programmability verification?

A: DiGi-Electronics programmability verification indicates that the part has been tested and confirmed for in-system programming capability. The CAT24C08YI-GT3 carries verified status, while the 24AA08HT-I/ST and M24C08-FDW6TP remain unverified. This does not affect functional compatibility but may be relevant for specific manufacturing or test requirements.

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