AT24C01A-10SC EEPROM 1Kbit I2C Equivalent & Substitute Parts

Part Overview

The AT24C01A-10SC is a 1Kbit EEPROM memory IC with I2C interface operating at 400 kHz, manufactured by Microchip Technology in 8-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and design requirements. Substitute parts must maintain functional compatibility across memory capacity, interface protocol, and electrical operating parameters while meeting current RoHS compliance standards.

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	5ms
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following parameters:

Core Functional Requirements:

Memory Size: 1Kbit (128 x 8 organization)
Memory Interface: I2C protocol
Clock Frequency: 400 kHz
Package Type: 8-SOIC or 8-SOP variants with compatible pin pitch

Electrical Compatibility Criteria:

Voltage Supply Range: Must encompass or exceed 4.5V ~ 5.5V minimum requirement
Access Time: 900 ns or faster acceptable
Write Cycle Time: 5ms or faster acceptable
Operating Temperature: Must support minimum 0°C ~ 70°C range

Compliance & Status:

RoHS3 Compliant status preferred for new designs
Active product status preferred; Not For New Designs acceptable for legacy applications
Moisture Sensitivity Level: 1 (Unlimited) standard across all candidates

Substitute parts are grouped by manufacturer and product status, with electrical parameter variations noted for design consideration.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Memory Interface	Clock Frequency	Access Time	Voltage Supply	Operating Temperature	Package	Product Status	RoHS Status
AT24C01A-10SC	Microchip Technology	1Kbit	I2C	400 kHz	900 ns	4.5V ~ 5.5V	0°C ~ 70°C	8-SOIC (3.90mm)	Obsolete	RoHS non-compliant
24AA01/SN	Microchip Technology	1Kbit	I2C	400 kHz	3500 ns	1.7V ~ 5.5V	0°C ~ 70°C	8-SOIC (3.90mm)	Active	ROHS3 Compliant
24AA01H-I/SN	Microchip Technology	1Kbit	I2C	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC (3.90mm)	Active	ROHS3 Compliant
24C01C-I/SN	Microchip Technology	1Kbit	I2C	400 kHz	900 ns	4.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC (3.90mm)	Active	ROHS3 Compliant
BR24L01AF-WE2	Rohm Semiconductor	1Kbit	I2C	400 kHz	Not specified	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOP (4.40mm)	Active	ROHS3 Compliant
BR24T01F-WE2	Rohm Semiconductor	1Kbit	I2C	400 kHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-SOP (4.40mm)	Active	ROHS3 Compliant
BR24T01FJ-WE2	Rohm Semiconductor	1Kbit	I2C	400 kHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-SOP-J (3.90mm)	Active	ROHS3 Compliant
M24C01-RMN6P	STMicroelectronics	1Kbit	I2C	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC (3.90mm)	Active	ROHS3 Compliant
M24C01-RMN6TP	STMicroelectronics	1Kbit	I2C	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC (3.90mm)	Active	ROHS3 Compliant
M24C01-WMN6P	STMicroelectronics	1Kbit	I2C	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC (3.90mm)	Not For New Designs	ROHS3 Compliant
M24C01-WMN6TP	STMicroelectronics	1Kbit	I2C	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC (3.90mm)	Not For New Designs	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Pin-Compatible Replacement (8-SOIC 3.90mm Package):

24C01C-I/SN is the primary substitute for AT24C01A-10SC. Both parts maintain identical voltage supply range (4.5V ~ 5.5V), matching package dimensions, and equivalent access time (900 ns). The 24C01C-I/SN offers extended operating temperature range (-40°C ~ 85°C) and ROHS3 compliance, addressing the obsolescence of the original part while maintaining electrical compatibility.

24AA01H-I/SN provides an alternative with broader voltage tolerance (1.7V ~ 5.5V) and extended temperature range. The slower access time (3500 ns for 24AA01/SN variant) may impact timing-critical applications but remains functionally compatible for standard I2C operations.

For Extended Temperature Range Applications:

M24C01-RMN6P and M24C01-RMN6TP (STMicroelectronics) deliver 900 ns access time with -40°C ~ 85°C operating range and ROHS3 compliance. These parts support lower minimum voltage (1.8V) compared to the original specification.

For Package Flexibility (8-SOP Variants):

BR24T01FJ-WE2 maintains the 3.90mm package width while offering 8-SOP-J configuration. BR24L01AF-WE2 and BR24T01F-WE2 use wider 4.40mm SOP packages, requiring PCB layout verification before selection.

Status Considerations:

All recommended substitutes carry Active product status except M24C01-WMN6P and M24C01-WMN6TP, which are marked Not For New Designs. These latter options remain available for legacy system support but should not be selected for new designs.

Frequently Asked Questions (FAQ)

Q: Can 24AA01/SN replace AT24C01A-10SC in all applications?

A: 24AA01/SN is functionally compatible for I2C memory operations at 400 kHz. The 3500 ns access time is slower than the original 900 ns specification. Applications with strict timing requirements should use 24AA01H-I/SN or 24C01C-I/SN instead.

Q: What is the difference between 8-SOIC and 8-SOP packages?

A: Both are 8-pin surface mount packages with identical pin count and I2C functionality. The primary difference is package width: 8-SOIC measures 3.90mm or 4.40mm depending on variant, while 8-SOP variants follow similar dimensions. PCB footprint compatibility must be verified before substitution.

Q: Are Rohm Semiconductor BR24 series parts pin-compatible with Microchip AT24 series?

A: BR24T01FJ-WE2 and BR24T01F-WE2 maintain identical I2C pin configuration and 1Kbit memory organization. Package width differences (3.90mm for BR24T01FJ-WE2 versus 4.40mm for BR24T01F-WE2) require footprint verification. Electrical parameters are compatible within specified voltage and temperature ranges.

Q: Why do some substitutes have lower minimum voltage specifications?

A: Parts like 24AA01H-I/SN (1.7V minimum) and M24C01-RMN6P (1.8V minimum) use advanced process technology enabling lower voltage operation. Applications requiring 4.5V ~ 5.5V operation should select 24C01C-I/SN or verify voltage compatibility before substitution.

Q: Which substitute is recommended for new product designs?

A: 24C01C-I/SN or 24AA01H-I/SN are preferred for new designs. Both carry Active product status, ROHS3 compliance, and extended operating temperature ranges. 24C01C-I/SN maintains the original voltage specification (4.5V ~ 5.5V), while 24AA01H-I/SN offers broader voltage tolerance.

Q: What is the significance of "Not For New Designs" status?

A: M24C01-WMN6P and M24C01-WMN6TP are functionally equivalent but designated for legacy system support only. Manufacturers recommend selecting Active status parts for new product development to ensure long-term availability and supply chain stability.

Q: Are there inventory considerations for substitute selection?

A: Inventory levels vary significantly across substitutes. M24C01-WMN6TP shows highest availability (50,527 pcs), while 24C01C-I/SN shows lower stock (1,115 pcs). Procurement timelines should account for inventory depth when selecting substitutes.

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