AT24CS01-XHM-B Equivalent & Substitute Parts

Part Overview

The AT24CS01-XHM-B is a 1Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface operation at 1 MHz with 550 ns access time. This component is actively produced and widely used in embedded systems requiring non-volatile serial memory storage. Substitute parts are identified based on matching memory capacity, interface protocol, package type, and electrical operating parameters to ensure functional compatibility in system designs.

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-TSSOP
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the AT24CS01-XHM-B are qualified based on the following critical parameters:

Memory capacity: 1Kbit with 128 x 8 organization
Serial interface: I2C protocol
Package: 8-TSSOP surface mount form factor
Supply voltage compatibility: Overlapping operating ranges
Temperature range: -40°C ~ 85°C operation
Write cycle time: 5ms specification
RoHS3 compliance and REACH unaffected status

Parts meeting these criteria are classified as parametric equivalents or manufacturer-recommended alternatives. Variations in clock frequency and access time do not preclude substitution when the I2C interface and memory organization remain identical.

Parameter Comparison

Parameter	AT24CS01-XHM-B	AT24C01C-XHM-B	M24C01-RDW6TP	M24C01-WDW6TP
Manufacturer	Microchip Technology	Microchip Technology	STMicroelectronics	STMicroelectronics
Memory Size	1Kbit	1Kbit	1Kbit	1Kbit
Memory Organization	128 x 8	128 x 8	128 x 8	128 x 8
Memory Interface	I2C	I2C	I2C	I2C
Clock Frequency	1 MHz	1 MHz	400 kHz	400 kHz
Access Time	550 ns	550 ns	900 ns	900 ns
Write Cycle Time	5ms	5ms	5ms	5ms
Voltage Supply Range	1.7V ~ 5.5V	1.7V ~ 5.5V	1.8V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Not For New Designs

Engineering Selection Recommendations

AT24C01C-XHM-B is a parametric equivalent manufactured by Microchip Technology with identical electrical specifications and package configuration. This part is recommended for direct substitution where supply continuity or inventory availability requires component interchange.

M24C01-RDW6TP is a manufacturer-recommended alternative from STMicroelectronics. While clock frequency is reduced to 400 kHz and access time increases to 900 ns, the I2C interface, memory capacity, and package remain compatible. This part is suitable for applications where timing margins accommodate the slower access characteristics.

M24C01-WDW6TP is designated as Not For New Designs by the manufacturer. Although electrically compatible, this part carries a restricted product status and should not be selected for new system development. The minimum supply voltage is elevated to 2.5V, which may limit compatibility in low-voltage applications.

Frequently Asked Questions (FAQ)

Q: Can AT24C01C-XHM-B replace AT24CS01-XHM-B directly?

A: Yes. Both parts share identical memory capacity, I2C interface, clock frequency, access time, supply voltage range, and 8-TSSOP package. No design modifications are required.

Q: What are the timing differences between AT24CS01-XHM-B and M24C01-RDW6TP?

A: The M24C01-RDW6TP operates at 400 kHz clock frequency versus 1 MHz for the AT24CS01-XHM-B, and has 900 ns access time versus 550 ns. Both maintain 5ms write cycle time. Substitution is valid if system timing specifications accommodate these slower parameters.

Q: Why is M24C01-WDW6TP marked as Not For New Designs?

A: This designation indicates the manufacturer has discontinued active development for this part. While functionally compatible, it should not be selected for new product designs due to potential future availability constraints.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the environmental and regulatory requirements of the AT24CS01-XHM-B.

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

A: AT24CS01-XHM-B and AT24C01C-XHM-B operate from 1.7V minimum. M24C01-RDW6TP requires 1.8V minimum. M24C01-WDW6TP requires 2.5V minimum. System design must accommodate the highest minimum voltage when substituting parts.

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