AT24C01-10SC-1.8 Equivalent & Substitute Parts

Part Overview

The AT24C01-10SC-1.8 is a 1Kbit EEPROM memory IC with I2C interface operating at 400 kHz, manufactured by Microchip Technology. This component features a supply voltage range of 1.8V to 5.5V and is housed in an 8-SOIC surface mount package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Memory Size	1Kbit
Memory Organization	128 x 8
Memory Interface	I2C
Clock Frequency	400 kHz
Voltage Supply Range	1.8V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the AT24C01-10SC-1.8 is determined by strict equivalence across the following parameters:

Memory capacity: 1Kbit
Memory organization: 128 x 8 bits
Interface protocol: I2C
Clock frequency: 400 kHz minimum
Package: 8-SOIC form factor
Supply voltage compatibility: minimum 1.8V operation
Operating temperature range: 0°C to 70°C

The 24AA01/SN meets all these criteria and serves as a direct functional equivalent. Both parts share identical memory specifications, interface characteristics, and physical packaging, enabling pin-for-pin replacement in applications requiring 1Kbit I2C EEPROM functionality.

Parameter Comparison

Parameter	AT24C01-10SC-1.8	24AA01/SN
Memory Size	1Kbit	1Kbit
Memory Organization	128 x 8	128 x 8
Memory Interface	I2C	I2C
Clock Frequency	400 kHz	400 kHz
Access Time	900 ns	3500 ns
Write Cycle Time	10 ms	5 ms
Voltage Supply Range	1.8V ~ 5.5V	1.7V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The 24AA01/SN is the qualified substitute for AT24C01-10SC-1.8 applications. Selection should be based on the following factors:

Product Status: The AT24C01-10SC-1.8 is obsolete, while the 24AA01/SN maintains active production status with verified availability of 41,400 units in stock, ensuring supply chain continuity.

Compliance Certification: The 24AA01/SN is ROHS3 compliant, whereas the original part is non-compliant. This distinction is critical for applications subject to RoHS regulations or customer requirements mandating compliant components.

Electrical Compatibility: Both parts operate within the same I2C protocol at 400 kHz and share identical memory organization. The 24AA01/SN exhibits longer access time (3500 ns versus 900 ns) and shorter write cycle time (5 ms versus 10 ms). These timing differences are within typical I2C application tolerances and do not preclude functional substitution in standard I2C bus implementations.

Voltage Specification: The 24AA01/SN minimum supply voltage is 1.7V compared to 1.8V for the original part. This represents a marginal difference that does not restrict substitution in applications operating within the 1.8V to 5.5V range.

Package Equivalence: Identical 8-SOIC packaging ensures mechanical and electrical pin compatibility without PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can the 24AA01/SN replace the AT24C01-10SC-1.8 in existing designs?

A: Yes. Both parts are pin-compatible 8-SOIC packages with identical I2C interface, memory capacity, and operating temperature range. No circuit modifications are required for direct substitution.

Q: What is the significance of the access time difference (900 ns vs. 3500 ns)?

A: Access time defines the delay between address setup and data availability. The 24AA01/SN's longer access time remains well within I2C protocol specifications and does not impact standard I2C bus operation. Applications with timing-critical requirements should verify compatibility with their specific I2C master implementation.

Q: Does the RoHS compliance difference affect substitution?

A: RoHS compliance is a regulatory and procurement consideration rather than a functional parameter. If your application or customer requires RoHS-compliant components, the 24AA01/SN is the appropriate choice. The AT24C01-10SC-1.8 is unsuitable for RoHS-regulated applications.

Q: Are there supply voltage compatibility concerns?

A: The 24AA01/SN operates at 1.7V minimum versus 1.8V for the original part. For applications powered at 1.8V or higher, this difference is negligible. Systems operating below 1.8V should confirm the 24AA01/SN's performance at their specific supply voltage.

Q: What is the write cycle time difference impact?

A: The 24AA01/SN features a faster write cycle (5 ms versus 10 ms). This improvement does not create compatibility issues and may enhance performance in applications performing frequent write operations. I2C protocol timing remains unaffected.

Q: Is the 24AA01/SN verified for programmability?

A: Yes. The 24AA01/SN is marked as DiGi-Electronics Programmable Verified, confirming compatibility with standard programming equipment and procedures.

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