AT24C01A-10SC-2.5 Equivalent & Substitute Parts

Part Overview

The AT24C01A-10SC-2.5 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 maintenance applications. The device provides non-volatile memory storage with 128 x 8 organization 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
Write Cycle Time	5ms
Access Time	900 ns
Voltage Supply Range	2.5V ~ 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 for the AT24C01A-10SC-2.5 is determined by the following critical parameters:

Memory capacity (1Kbit) and organization (128 x 8)
I2C interface with 400 kHz clock frequency
5ms write cycle time
8-SOIC or compatible package footprint
Supply voltage compatibility (minimum 2.5V requirement)
Operating temperature range (minimum 0°C lower bound)

Substitute parts are grouped into two categories based on these criteria:

Category 1: Direct Microchip Technology Substitutes - Parts maintaining identical electrical specifications with active product status and RoHS3 compliance.

Category 2: Cross-Manufacturer Alternatives - Parts from Rohm Semiconductor and STMicroelectronics meeting core functional requirements with extended operating temperature ranges and improved voltage supply flexibility.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Interface	Clock Freq	Access Time	Voltage Supply	Temp Range	Package	Status	RoHS
AT24C01A-10SC-2.5	Microchip	1Kbit	I2C	400 kHz	900 ns	2.5V ~ 5.5V	0°C ~ 70°C	8-SOIC	Obsolete	Non-compliant
24AA01/SN	Microchip	1Kbit	I2C	400 kHz	3500 ns	1.7V ~ 5.5V	0°C ~ 70°C	8-SOIC	Active	ROHS3
24LC01BT-I/SN	Microchip	1Kbit	I2C	400 kHz	4.6 µs	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3
24AA01H-I/SN	Microchip	1Kbit	I2C	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3
24LC01B-I/SN	Microchip	1Kbit	I2C	400 kHz	4.6 µs	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3
BR24L01AF-WE2	Rohm	1Kbit	I2C	400 kHz	Not specified	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOP	Active	ROHS3
BR24T01F-WE2	Rohm	1Kbit	I2C	400 kHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-SOP	Active	ROHS3
BR24T01FJ-WE2	Rohm	1Kbit	I2C	400 kHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-SOP-J	Active	ROHS3
M24C01-RMN6P	STMicroelectronics	1Kbit	I2C	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3
M24C01-RMN6TP	STMicroelectronics	1Kbit	I2C	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3
M24C01-WMN6P	STMicroelectronics	1Kbit	I2C	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Not For New Designs	ROHS3

Engineering Selection Recommendations

Primary Recommendation: 24AA01H-I/SN

The 24AA01H-I/SN from Microchip Technology provides the closest electrical match to the AT24C01A-10SC-2.5, maintaining 900 ns access time and identical memory organization. This part is active, RoHS3 compliant, and extends the operating temperature range to -40°C to 85°C. The supply voltage range of 1.7V to 5.5V provides greater flexibility than the original part.

Secondary Recommendation: M24C01-RMN6TP

The M24C01-RMN6TP from STMicroelectronics matches the 900 ns access time specification and maintains 8-SOIC packaging. This part is active with RoHS3 compliance and verified DiGi-Electronics programmability. The supply voltage range extends to 1.8V minimum, and operating temperature reaches -40°C to 85°C.

Alternative for Extended Temperature: 24LC01B-I/SN

For applications requiring the extended -40°C to 85°C operating range with maintained 2.5V minimum supply voltage, the 24LC01B-I/SN provides active status and RoHS3 compliance. Access time increases to 4.6 µs, which remains compatible with 400 kHz I2C operation.

Cross-Manufacturer Option: BR24T01FJ-WE2

The BR24T01FJ-WE2 from Rohm Semiconductor offers 1Kbit capacity with I2C 400 kHz interface in 8-SOP-J package. This part is active and RoHS3 compliant with extended temperature range to -40°C to 85°C and minimum supply voltage of 1.6V. Package footprint differs from the original 8-SOIC specification.

Frequently Asked Questions (FAQ)

Q: Can I use 24AA01/SN as a direct replacement for AT24C01A-10SC-2.5?

A: The 24AA01/SN meets core functional requirements (1Kbit, I2C 400 kHz, 8-SOIC package) and is active with RoHS3 compliance. However, access time increases from 900 ns to 3500 ns. This is acceptable for I2C 400 kHz operation but represents a performance trade-off. The part is suitable for applications where the slower access time does not impact system timing.

Q: What is the difference between 24LC01BT-I/SN and 24LC01B-I/SN?

A: Both parts share identical electrical specifications (1Kbit, I2C 400 kHz, 4.6 µs access time, 2.5V to 5.5V supply, -40°C to 85°C operating range, 8-SOIC package). The primary difference is packaging format: 24LC01BT-I/SN is supplied in Cut Tape and Digi-Reel format, while 24LC01B-I/SN is supplied in Tube format.

Q: Are Rohm Semiconductor parts (BR24L01AF-WE2, BR24T01F-WE2, BR24T01FJ-WE2) compatible with the original AT24C01A-10SC-2.5?

A: Rohm parts maintain 1Kbit capacity, I2C 400 kHz interface, and 5ms write cycle time. However, package type differs: Rohm parts use 8-SOP or 8-SOP-J versus the original 8-SOIC (0.154", 3.90mm). Physical footprint compatibility must be verified for PCB layout. All Rohm alternatives are active and RoHS3 compliant with extended operating temperature to -40°C to 85°C.

Q: Which substitute part has the fastest access time?

A: The AT24C01A-10SC-2.5 (900 ns), 24AA01H-I/SN (900 ns), M24C01-RMN6P (900 ns), M24C01-RMN6TP (900 ns), and M24C01-WMN6P (900 ns) all maintain 900 ns access time. The 24AA01/SN and 24LC01BT-I/SN have slower access times of 3500 ns and 4.6 µs respectively, which remain compatible with 400 kHz I2C bus operation.

Q: What is the minimum supply voltage requirement for each substitute?

A: Supply voltage ranges vary: 24AA01/SN and 24AA01H-I/SN support 1.7V minimum; M24C01-RMN6P and M24C01-RMN6TP support 1.8V minimum; BR24T01F-WE2 and BR24T01FJ-WE2 support 1.6V minimum; 24LC01BT-I/SN, 24LC01B-I/SN, and M24C01-WMN6P maintain 2.5V minimum matching the original part. System supply voltage determines which parts are suitable.

Q: Is M24C01-WMN6P recommended for new designs?

A: M24C01-WMN6P is marked as "Not For New Designs" by STMicroelectronics. While it meets functional requirements and is RoHS3 compliant, active alternatives such as M24C01-RMN6TP or 24AA01H-I/SN are preferred for new product development.

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