AT24C01-10SC-2.5 EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The AT24C01-10SC-2.5 is a 1Kbit I2C EEPROM memory IC manufactured by Microchip Technology in 8-SOIC surface mount packaging. This part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing design support and production continuity. The AT24C01-10SC-2.5 operates at 400 kHz I2C clock frequency with 900 ns access time and supports supply voltages from 2.5V to 5.5V across an operating temperature range of 0°C to 70°C.

Key Parameters

Parameter	Value
Memory Size	1Kbit
Memory Organization	128 x 8
Memory Interface	I2C
Clock Frequency	400 kHz
Access Time	900 ns
Write Cycle Time	10 ms
Voltage Supply Range	2.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the AT24C01-10SC-2.5 is determined by strict equivalence across the following critical parameters: memory size (1Kbit), memory organization (128 x 8), I2C interface protocol, clock frequency (400 kHz), package type (8-SOIC), and mounting method (surface mount). All substitute parts listed maintain these core specifications. Voltage supply range, access time, write cycle time, and operating temperature range are secondary parameters that define functional compatibility within system constraints.

The substitute parts are categorized as follows:

Direct Manufacturer Equivalent: 24AA01/SN provides functional equivalence with extended voltage supply range (1.7V ~ 5.5V) and faster write cycle time (5 ms), classified as active product status.

Parametric Equivalents: 24LC21/SN, 24LC21A/SN, and 24LCS21A/SN maintain identical electrical and mechanical specifications to the AT24C01-10SC-2.5, all classified as active product status with RoHS3 compliance.

Parameter Comparison

Parameter	AT24C01-10SC-2.5	24AA01/SN	24LC21/SN	24LC21A/SN	24LCS21A/SN
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology
Memory Size	1Kbit	1Kbit	1Kbit	1Kbit	1Kbit
Memory Organization	128 x 8	128 x 8	128 x 8	128 x 8	128 x 8
Memory Interface	I2C	I2C	I2C	I2C	I2C
Clock Frequency	400 kHz	400 kHz	400 kHz	400 kHz	400 kHz
Access Time	900 ns	3500 ns	900 ns	900 ns	900 ns
Write Cycle Time	10 ms	5 ms	10 ms	10 ms	10 ms
Voltage Supply Range	2.5V ~ 5.5V	1.7V ~ 5.5V	2.5V ~ 5.5V	2.5V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For applications currently using the AT24C01-10SC-2.5, transition to an active product status substitute is recommended due to obsolescence classification. The 24LC21/SN, 24LC21A/SN, and 24LCS21A/SN provide direct parametric equivalence with identical electrical characteristics and RoHS3 compliance certification. These three options are functionally interchangeable for designs requiring strict parameter matching.

The 24AA01/SN offers extended voltage supply range (1.7V ~ 5.5V) and faster write cycle time (5 ms), making it suitable for applications with lower supply voltage requirements or where reduced write latency provides system benefit. However, the 24AA01/SN exhibits slower access time (3500 ns) compared to the AT24C01-10SC-2.5 (900 ns), which may impact timing-critical read operations.

All substitute parts maintain identical I2C protocol compatibility, 1Kbit memory capacity, 128 x 8 organization, 400 kHz clock frequency, and 8-SOIC surface mount packaging. All substitute parts carry RoHS3 compliance certification, addressing regulatory requirements that the obsolete AT24C01-10SC-2.5 does not meet.

Frequently Asked Questions (FAQ)

Q: Can the 24AA01/SN directly replace the AT24C01-10SC-2.5 in existing designs?

A: The 24AA01/SN is functionally compatible as a direct manufacturer equivalent. It maintains identical memory capacity, I2C interface, clock frequency, and 8-SOIC packaging. The extended voltage supply range (1.7V ~ 5.5V) provides broader operational flexibility. However, the slower access time (3500 ns versus 900 ns) must be evaluated against system timing requirements. The faster write cycle time (5 ms versus 10 ms) may provide performance benefit in write-intensive applications.

Q: What is the difference between the 24LC21/SN, 24LC21A/SN, and 24LCS21A/SN?

A: These three parts are parametric equivalents with identical electrical and mechanical specifications. All three maintain 900 ns access time, 10 ms write cycle time, 2.5V to 5.5V supply voltage range, and 8-SOIC packaging. All three are classified as active product status with RoHS3 compliance. Selection among these three options may be based on availability, packaging format (all supplied in tubes), or inventory considerations.

Q: Are all substitute parts RoHS compliant?

A: Yes. The 24AA01/SN, 24LC21/SN, 24LC21A/SN, and 24LCS21A/SN are all ROHS3 compliant. The original AT24C01-10SC-2.5 is classified as RoHS non-compliant. Substitution to any of these active parts addresses RoHS compliance requirements for new designs or production updates.

Q: Can I use these substitute parts in new designs?

A: Yes. All substitute parts are classified as active product status, ensuring ongoing availability and manufacturing support. The 24LC21/SN, 24LC21A/SN, and 24LCS21A/SN provide direct parametric equivalence for designs requiring strict specification matching. The 24AA01/SN offers extended voltage range for designs with lower supply voltage requirements.

Q: What packaging options are available for these substitute parts?

A: All substitute parts are supplied in 8-SOIC surface mount packaging with 0.154" width (3.90mm). The 24AA01/SN, 24LC21/SN, 24LC21A/SN, and 24LCS21A/SN are all available in tube packaging format, suitable for automated assembly processes.

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