AT24C01A-10SC-2.7 Equivalent & Substitute Parts

Part Overview

The AT24C01A-10SC-2.7 is a 1Kbit EEPROM memory IC with I2C interface operating at 400 kHz, manufactured by Microchip Technology in 8-SOIC surface mount packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The device provides non-volatile memory storage with 128 x 8 organization and operates across a 2.7V to 5.5V supply voltage range with 0°C to 70°C temperature specifications.

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	2.7V ~ 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 for the AT24C01A-10SC-2.7 is determined by the following critical parameters:

Memory capacity (1Kbit) and organization (128 x 8)
I2C interface protocol
Clock frequency compatibility (400 kHz minimum)
Package type (8-SOIC surface mount)
Supply voltage range overlap
Access time and write cycle time specifications

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

Category 1: Direct Microchip Technology Substitutes — Parts from the same manufacturer with identical memory specifications and I2C interface, offering the highest compatibility and design continuity.

Category 2: Extended Temperature Range Alternatives — Microchip parts with improved temperature operating ranges (-40°C to 85°C) and active product status, suitable for applications requiring broader environmental specifications.

Category 3: Alternative Manufacturer Options — ROHM Semiconductor EEPROM devices with 1Kbit capacity and I2C interface, providing supply chain flexibility while maintaining core functional compatibility.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temperature	Package	Product Status	RoHS Status
AT24C01A-10SC-2.7	Microchip Technology	1Kbit	400 kHz	900 ns	2.7V ~ 5.5V	0°C ~ 70°C	8-SOIC	Obsolete	RoHS Non-Compliant
24AA01/SN	Microchip Technology	1Kbit	400 kHz	3500 ns	1.7V ~ 5.5V	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant
24LC01BT-I/SN	Microchip Technology	1Kbit	400 kHz	4.6 µs	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
24AA01H-I/SN	Microchip Technology	1Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
24LC01B-I/SN	Microchip Technology	1Kbit	400 kHz	4.6 µs	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
24LC01B/SN	Microchip Technology	1Kbit	400 kHz	4.6 µs	2.5V ~ 5.5V	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant
24LC01BT/SN	Microchip Technology	1Kbit	400 kHz	4.6 µs	2.5V ~ 5.5V	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant
BR24C01-RMN6TP	ROHM Semiconductor	1Kbit	100 kHz	Not Specified	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Not For New Designs	ROHS3 Compliant
BR24G01FJ-3AGTE2	ROHM Semiconductor	1Kbit	1 MHz	Not Specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
BR24L01AF-WE2	ROHM Semiconductor	1Kbit	400 kHz	Not Specified	1.8V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
BR24T01F-WE2	ROHM Semiconductor	1Kbit	400 kHz	Not Specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: 24AA01H-I/SN

This Microchip Technology part matches the original AT24C01A-10SC-2.7 access time specification (900 ns) while offering active product status and ROHS3 compliance. The extended temperature range (-40°C to 85°C) provides design flexibility beyond the original specification. Supply voltage range (1.7V to 5.5V) encompasses the original range.

Secondary Recommendation: 24LC01B-I/SN or 24LC01B/SN

These parts provide active product status and ROHS3 compliance with extended temperature range support. Access time specification (4.6 µs) is slower than the original but remains within acceptable I2C 400 kHz operation parameters. Temperature variant selection depends on application requirements: 24LC01B-I/SN for -40°C to 85°C, or 24LC01B/SN for 0°C to 70°C matching original specifications.

Alternative Manufacturer Option: BR24L01AF-WE2 or BR24T01F-WE2

ROHM Semiconductor parts provide 400 kHz I2C operation with active product status and ROHS3 compliance. BR24L01AF-WE2 offers extended temperature range (-40°C to 85°C) with 1.8V minimum supply voltage. BR24T01F-WE2 provides the lowest supply voltage threshold (1.6V) with identical temperature range. Both support supply chain diversification.

Not Recommended: BR24C01-RMN6TP

This part carries "Not For New Designs" status and operates at reduced clock frequency (100 kHz), limiting I2C performance compatibility.

Frequently Asked Questions (FAQ)

Q: Can 24AA01/SN directly replace AT24C01A-10SC-2.7?

A: Functionally yes, with one consideration. The 24AA01/SN has slower access time (3500 ns vs. 900 ns), but both operate at 400 kHz I2C with identical memory capacity and organization. The 24AA01/SN is active and ROHS3 compliant, making it a viable substitute. However, if access time performance is critical to your application, 24AA01H-I/SN is the better choice.

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

A: Both parts are electrically identical with 1Kbit capacity and 400 kHz I2C operation. The primary difference is operating temperature range: 24LC01B-I/SN supports -40°C to 85°C, while 24LC01B/SN supports 0°C to 70°C (matching the original AT24C01A specification). Select based on your application's thermal requirements.

Q: Are ROHM parts compatible with Microchip designs?

A: Yes. ROHM BR24L01AF-WE2 and BR24T01F-WE2 maintain 1Kbit capacity, 128 x 8 organization, and 400 kHz I2C interface compatibility. Package dimensions differ slightly (0.173" vs. 0.154" width), but both are 8-SOIC surface mount. Verify PCB layout clearances before substitution. These parts support supply chain flexibility while maintaining functional compatibility.

Q: Why is BR24C01-RMN6TP not recommended?

A: This part operates at 100 kHz I2C frequency, significantly below the 400 kHz specification of the original AT24C01A-10SC-2.7. Additionally, it carries "Not For New Designs" status, indicating end-of-life trajectory. Use only if legacy system constraints require this specific part.

Q: What supply voltage considerations apply to substitutes?

A: The original AT24C01A-10SC-2.7 operates from 2.7V to 5.5V. Most substitutes offer wider ranges: 24AA01/SN and 24AA01H-I/SN support 1.7V minimum, while ROHM parts support 1.6V to 1.8V minimums. All substitutes maintain 5.5V maximum. Verify your power supply design operates within the selected part's voltage range.

Q: Does packaging width difference matter between 8-SOIC variants?

A: The original AT24C01A uses 0.154" width (3.90mm). ROHM BR24L01AF-WE2 and BR24T01F-WE2 use 0.173" width (4.40mm). Both are standard 8-SOIC packages. Verify PCB footprint compatibility and clearance to adjacent components before layout finalization. Microchip substitutes maintain the original 0.154" width.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message