24AA01-I/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24AA01-I/ST is a 1Kbit I2C EEPROM memory IC manufactured by Microchip Technology in an 8-TSSOP surface mount package. This non-volatile memory device operates at 400 kHz I2C clock frequency with a 3500 ns access time and supports a supply voltage range of 1.7V to 5.5V across an operating temperature range of -40°C to 85°C. The part is currently in active product status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are necessary when the primary part number becomes unavailable, when alternative sourcing is required for supply chain optimization, or when design flexibility permits selection from multiple qualified manufacturers offering identical or compatible electrical and mechanical specifications.

Substiute Parts

24AA01-I/ST

Microchip TechnologyIn Stock: 127524AA01-I/ST Datasheet

Current PartRFQ

AT24CS01-XHM-T

Microchip TechnologyIn Stock: 25488AT24CS01-XHM-T Datasheet

MFR RecommendedRFQ

BR24G01FVT-3GE2

Rohm SemiconductorIn Stock: 1212BR24G01FVT-3GE2 Datasheet

MFR RecommendedRFQ

BR24T01FVT-WE2

Rohm SemiconductorIn Stock: 1349BR24T01FVT-WE2 Datasheet

MFR RecommendedRFQ

M24C01-WDW6TP

STMicroelectronicsIn Stock: 111137M24C01-WDW6TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 24AA01-I/ST is determined by the following critical parameters:

Primary Substitution Criteria:

• Memory capacity: 1Kbit (128 x 8 organization)
• Interface protocol: I2C
• Package type: 8-TSSOP (0.173", 4.40mm Width)
• Mounting type: Surface Mount
• Operating temperature range: -40°C to 85°C minimum
• Supply voltage compatibility: Minimum 1.7V support required

Secondary Compatibility Factors:

• Clock frequency: 400 kHz or higher
• Access time: 3500 ns or faster
• Write cycle time: 5ms or faster
• RoHS compliance status
• Product status (Active preferred)

The substitute parts listed below meet all primary criteria and maintain compatibility with the 24AA01-I/ST in standard I2C memory applications. Variations in clock frequency and access time represent performance enhancements that do not compromise backward compatibility.

Parameter Comparison

Engineering Selection Recommendations

AT24CS01-XHM-T (Microchip Technology): This part offers superior performance with 1 MHz clock frequency and 550 ns access time while maintaining identical supply voltage range (1.7V ~ 5.5V) and active product status. It is suitable for applications requiring faster I2C communication without design modifications.

M24C01-WDW6TP (STMicroelectronics): This part matches the 400 kHz clock frequency and provides 900 ns access time. However, it carries "Not For New Designs" product status and has a minimum supply voltage of 2.5V, making it suitable only for legacy system maintenance or replacement scenarios where 1.7V operation is not required.

BR24G01FVT-3GE2 and BR24T01FVT-WE2 (Rohm Semiconductor): Both parts maintain 400 kHz clock frequency and 5ms write cycle time with active product status. The 8-TSSOP-B package variant is mechanically compatible with standard 8-TSSOP footprints. Supply voltage range of 1.6V ~ 5.5V provides compatibility with most applications, though designs requiring 1.7V minimum operation should verify margin requirements.

For new designs, AT24CS01-XHM-T or the Rohm alternatives are recommended. For legacy system support, M24C01-WDW6TP remains available with appropriate voltage margin verification.

Frequently Asked Questions (FAQ)

Q: Can AT24CS01-XHM-T replace 24AA01-I/ST directly without circuit modifications?

A: Yes. The AT24CS01-XHM-T is a direct functional replacement. The higher 1 MHz clock frequency and faster 550 ns access time are backward compatible with 400 kHz I2C bus designs. No circuit modifications are required.

Q: What is the difference between 8-TSSOP and 8-TSSOP-B packages?

A: Both packages are mechanically compatible with identical 0.173" width and 4.40mm dimensions. The "-B" designation indicates a variant from Rohm Semiconductor. PCB footprints designed for standard 8-TSSOP accommodate both variants without modification.

Q: Why does M24C01-WDW6TP have "Not For New Designs" status?

A: This designation indicates the manufacturer is not recommending this part for new product development. It remains available for existing system support and replacement applications. New designs should prioritize parts with "Active" status such as AT24CS01-XHM-T or Rohm alternatives.

Q: Is the 1.6V minimum supply voltage of Rohm parts compatible with 1.7V designs?

A: The Rohm parts specify 1.6V ~ 5.5V operation, which includes 1.7V operation. However, designs with tight voltage margins should verify that system supply regulation maintains adequate headroom above the 1.6V minimum threshold.

Q: Can these parts be used interchangeably in existing PCB assemblies?

A: Yes, all substitute parts use identical 8-TSSOP or 8-TSSOP-B packages with the same pinout and footprint. They are pin-compatible and can be used interchangeably in existing PCB designs without layout modifications.

Q: What compliance certifications apply to all listed parts?

A: All parts listed are ROHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited) moisture sensitivity rating. All parts are classified under ECCN EAR99 and HTSUS 8542.32.0051.