AT24CS01-MAHM-E Equivalent & Substitute Parts

Part Overview

The AT24CS01-MAHM-E is a 1Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface operation at 1 MHz with 550 ns access time. This non-volatile memory device is packaged in 8-UDFN (2x3) surface mount configuration and operates across a wide voltage range of 1.7V to 5.5V with temperature stability from -40°C to 85°C. The part is currently in active production status with ROHS3 compliance and REACH unaffected classification. Substitute parts are identified based on matching core electrical parameters: memory capacity, interface protocol, clock frequency compatibility, voltage supply range, operating temperature range, and mechanical package compatibility.

Key Parameters

Parameter	Value
Memory Size	1Kbit
Memory Organization	128 x 8
Memory Interface	I2C
Clock Frequency	1 MHz
Access Time	550 ns
Write Cycle Time	5ms
Voltage Supply Range	1.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-UDFN (2x3)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the AT24CS01-MAHM-E are classified into two categories based on substitution criteria:

MFR Recommended Substitutes maintain identical electrical specifications and differ only in packaging format or moisture sensitivity level:

AT24CS01-SSHM-T: Same base part number (AT24CS01), identical electrical parameters, alternative 8-SOIC package with improved moisture handling (MSL 1 vs MSL 3)

Parametric Equivalents share core functional parameters (1Kbit capacity, 128x8 organization, I2C interface, 5ms write cycle, matching voltage and temperature ranges) but may differ in base part designation or clock frequency:

AT24C01C-MAHM-E and AT24C01C-MAHM-T: AT24C01C variant with identical package and electrical performance
AT24CS01-MAHM-T: Same base part number with Tape & Reel packaging
BR24G01NUX-3TTR: Rohm Semiconductor alternative with 400 kHz clock frequency (vs 1 MHz), same 1Kbit capacity, I2C interface, and compatible voltage/temperature specifications

Substitution eligibility is determined by: matching memory capacity (1Kbit), identical memory organization (128x8), I2C protocol compatibility, overlapping voltage supply ranges, matching operating temperature range, and mechanically compatible or equivalent packages.

Parameter Comparison

Parameter	AT24CS01-MAHM-E (Main)	AT24CS01-SSHM-T	AT24C01C-MAHM-E	AT24C01C-MAHM-T	AT24CS01-MAHM-T	BR24G01NUX-3TTR
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology	Rohm Semiconductor
Memory Size	1Kbit	1Kbit	1Kbit	1Kbit	1Kbit	1Kbit
Memory Organization	128 x 8	128 x 8	128 x 8	128 x 8	128 x 8	128 x 8
Memory Interface	I2C	I2C	I2C	I2C	I2C	I2C
Clock Frequency	1 MHz	1 MHz	1 MHz	1 MHz	1 MHz	400 kHz
Access Time	550 ns	550 ns	550 ns	550 ns	550 ns	Not specified
Write Cycle Time	5ms	5ms	5ms	5ms	5ms	5ms
Voltage Supply Range	1.7V ~ 5.5V	1.7V ~ 5.5V	1.7V ~ 5.5V	1.7V ~ 5.5V	1.7V ~ 5.5V	1.6V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	8-UDFN (2x3)	8-SOIC	8-UDFN (2x3)	8-UDFN (2x3)	8-UDFN (2x3)	VSON008X2030
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
MSL Rating	3 (168 Hours)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts maintain active production status and ROHS3 compliance, ensuring long-term availability and regulatory alignment with the AT24CS01-MAHM-E.

AT24CS01-SSHM-T is the MFR recommended substitute when package footprint change is acceptable. The 8-SOIC package provides superior moisture handling (MSL 1 unlimited vs MSL 3 168-hour rating) while maintaining identical electrical performance. This substitution is appropriate for applications with extended storage or high-humidity assembly environments.

AT24C01C-MAHM-E and AT24C01C-MAHM-T are parametric equivalents using the AT24C01C base part number with identical package, electrical specifications, and performance characteristics. These parts are suitable for direct substitution where AT24C01C variant designation is acceptable in design documentation.

AT24CS01-MAHM-T provides identical specifications to the main part with Tape & Reel packaging format, enabling substitution based on procurement or supply chain requirements.

BR24G01NUX-3TTR from Rohm Semiconductor is a cross-manufacturer substitute with 400 kHz clock frequency operation (reduced from 1 MHz). This part maintains 1Kbit capacity, I2C interface, 5ms write cycle, and compatible voltage/temperature ranges. The lower clock frequency may impact system timing in applications requiring 1 MHz I2C operation. MSL 1 rating provides improved moisture tolerance. This substitution requires verification of I2C bus timing compatibility in the target application.

Frequently Asked Questions (FAQ)

Q: Can AT24CS01-SSHM-T replace AT24CS01-MAHM-E directly?

A: Yes. Both parts share identical electrical specifications (1Kbit, I2C 1 MHz, 550 ns access time, 1.7V-5.5V supply, -40°C to 85°C operation). The primary difference is package format: 8-SOIC vs 8-UDFN. PCB layout and footprint must be redesigned for the 8-SOIC package. The improved MSL 1 rating makes this substitute preferable for moisture-sensitive applications.

Q: What is the difference between AT24CS01 and AT24C01C variants?

A: Both variants share identical electrical performance and 1Kbit capacity with 128x8 organization. The AT24C01C designation represents a product line variant from Microchip Technology. Substitution between variants is electrically valid when package and voltage specifications match.

Q: Can BR24G01NUX-3TTR operate at 1 MHz like the main part?

A: No. BR24G01NUX-3TTR operates at 400 kHz maximum clock frequency. This reduced speed is compatible with I2C protocol but may not meet applications requiring 1 MHz operation. System timing analysis is required before substitution.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitutes maintain ROHS3 compliance and REACH unaffected status, matching the regulatory classification of AT24CS01-MAHM-E.

Q: Which substitute has the best moisture tolerance?

A: AT24CS01-SSHM-T and BR24G01NUX-3TTR both carry MSL 1 (unlimited) ratings, compared to MSL 3 (168 hours) for the main part and other Microchip substitutes. MSL 1 rating is advantageous for extended storage or high-humidity manufacturing environments.

Q: Can I use BR24G01NUX-3TTR in a design originally specified for AT24CS01-MAHM-E?

A: Substitution requires verification of I2C bus timing. The 400 kHz clock frequency is slower than the 1 MHz specification of the main part. If the application I2C bus is configured for 1 MHz operation, the BR24G01NUX-3TTR will operate at reduced speed but remain functional. Confirm that system timing tolerances accommodate 400 kHz operation.

Q: What packaging options are available among substitutes?

A: Three package types are represented: 8-UDFN (2x3) used by the main part and three substitutes; 8-SOIC used by AT24CS01-SSHM-T; VSON008X2030 used by BR24G01NUX-3TTR. Package selection depends on PCB layout constraints and manufacturing capabilities.

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