Equivalent & Substitute Parts for 24AA01HT-I/OT

Part Overview

The 24AA01HT-I/OT is a 1Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface communication at 400 kHz with 900 ns access time. This component is packaged in SOT-23-5 surface mount configuration and operates across a supply voltage range of 1.7V to 5.5V with an operating temperature range of -40°C to 85°C. The part maintains Active product status with ROHS3 compliance and unlimited moisture sensitivity level rating. Equivalent and substitute parts are identified to address inventory availability, packaging preferences, or performance optimization requirements while maintaining functional compatibility within specified electrical and mechanical parameters.

Key Parameters

Parameter	Specification
Memory Size	1Kbit
Memory Organization	128 x 8
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	SOT-23-5
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 24AA01HT-I/OT are qualified based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are: identical memory capacity (1Kbit), matching memory organization (128 x 8), compatible I2C interface protocol, identical supply voltage range (1.7V ~ 5.5V), matching operating temperature range (-40°C ~ 85°C), and compatible SOT-23-5 surface mount packaging. Secondary parameters including clock frequency, access time, and packaging format (tape & reel versus cut tape) may vary within acceptable operational limits without affecting core functionality. All substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity level classification.

Parameter Comparison

Parameter	24AA01HT-I/OT (Main)	24AA01T-I/OT	AT24CS01-STUM-T
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology
Memory Size	1Kbit	1Kbit	1Kbit
Memory Organization	128 x 8	128 x 8	128 x 8
Memory Interface	I2C	I2C	I2C
Clock Frequency	400 kHz	400 kHz	1 MHz
Access Time	900 ns	3500 ns	550 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	SOT-23-5	SOT-23-5	SOT-23-5
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Packaging Format	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®
Product Status	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All three parts maintain Active product status with ROHS3 compliance and identical moisture sensitivity level ratings, confirming regulatory and environmental compatibility. The 24AA01T-I/OT serves as the primary manufacturer-recommended substitute, offering identical electrical specifications with extended access time (3500 ns versus 900 ns) and alternative packaging format (Cut Tape & Digi-Reel® versus Tape & Reel). The AT24CS01-STUM-T provides enhanced performance characteristics with 1 MHz clock frequency and 550 ns access time, suitable for applications requiring faster I2C communication while maintaining backward compatibility with the 400 kHz interface specification. Selection between substitutes depends on packaging requirements, inventory availability, and application-specific timing constraints within the specified voltage and temperature operating ranges.

Frequently Asked Questions (FAQ)

Q: Can 24AA01T-I/OT replace 24AA01HT-I/OT in all applications? A: Yes. Both parts share identical memory capacity (1Kbit), organization (128 x 8), I2C interface, supply voltage range (1.7V ~ 5.5V), and operating temperature range (-40°C ~ 85°C). The extended access time of 24AA01T-I/OT (3500 ns) does not affect functional compatibility with systems designed for 900 ns access time. Packaging format differs (Cut Tape & Digi-Reel® versus Tape & Reel) but does not impact electrical performance.

Q: Is AT24CS01-STUM-T compatible with 24AA01HT-I/OT? A: Yes. AT24CS01-STUM-T maintains identical memory specifications, supply voltage range, operating temperature range, and SOT-23-5 packaging. The higher clock frequency (1 MHz) and faster access time (550 ns) provide enhanced performance while remaining compatible with I2C protocol requirements. Applications designed for 400 kHz operation will function correctly with this substitute.

Q: What are the packaging differences between these parts? A: The 24AA01HT-I/OT is supplied in Tape & Reel (TR) format. Both 24AA01T-I/OT and AT24CS01-STUM-T are supplied in Cut Tape (CT) & Digi-Reel® format. These packaging differences affect handling and assembly processes but do not impact electrical or mechanical compatibility.

Q: Are all three parts RoHS compliant? A: Yes. All three parts maintain ROHS3 compliance and are classified as REACH Unaffected with EAR99 export classification.

Q: What determines substitution eligibility for 1Kbit I2C EEPROM parts? A: Core substitution criteria include identical memory capacity (1Kbit), matching memory organization (128 x 8), I2C interface protocol compatibility, identical supply voltage range (1.7V ~ 5.5V), matching operating temperature range (-40°C ~ 85°C), and compatible SOT-23-5 surface mount packaging. Clock frequency and access time variations are acceptable provided they do not violate application timing requirements.

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