24FC256-I/MF Equivalent & Substitute Parts

Part Overview

The 24FC256-I/MF is a 256Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface communication at 1 MHz operation. This non-volatile memory device is designed for applications requiring persistent data storage with low power consumption and wide voltage tolerance. The component is actively produced and maintains full RoHS3 compliance. Substitute parts may be required due to inventory constraints, regional availability, or specific application timing requirements where alternative clock frequencies are acceptable.

Substiute Parts

24FC256-I/MF

Microchip TechnologyIn Stock: 225624FC256-I/MF Datasheet

Current PartRFQ

24AA256-I/MF

Microchip TechnologyIn Stock: 149524AA256-I/MF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The 24AA256-I/MF qualifies as a direct substitute based on the following critical parameters that determine functional compatibility:

Matching Parameters (Substitution Basis):

• Memory capacity: 256Kbit (identical)
• Memory organization: 32K x 8 (identical)
• Interface protocol: I2C (identical)
• Package type: 8-VDFN Exposed Pad (identical)
• Supplier device package: 8-DFN-S (6x5) (identical)
• Voltage supply range: 1.7V ~ 5.5V (identical)
• Operating temperature range: -40°C ~ 85°C (identical)
• Write cycle time: 5 ms (identical)
• RoHS compliance: ROHS3 Compliant (identical)
• Mounting type: Surface Mount (identical)

Differing Parameters (Performance Variance):

• Clock frequency: 24FC256-I/MF operates at 1 MHz; 24AA256-I/MF operates at 400 kHz
• Access time: 24FC256-I/MF has 400 ns access time; 24AA256-I/MF has 900 ns access time

The 24AA256-I/MF operates at reduced clock frequency and longer access time, making it suitable for applications where higher speed is not required. Both devices maintain identical electrical and mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

Both the 24FC256-I/MF and 24AA256-I/MF are active products from Microchip Technology with full RoHS3 compliance and REACH unaffected status. Selection between these parts should be based on application timing requirements. The 24FC256-I/MF is appropriate for systems requiring 1 MHz I2C operation and 400 ns access time. The 24AA256-I/MF is suitable for applications operating at 400 kHz I2C speeds where the 900 ns access time is acceptable. Both devices share identical electrical specifications, package geometry, and thermal operating range, ensuring direct PCB compatibility and interchangeability within the specified performance parameters.

Frequently Asked Questions (FAQ)

Q: Can the 24AA256-I/MF directly replace the 24FC256-I/MF on the same PCB?

A: Yes. Both parts use identical 8-VDFN Exposed Pad packaging with matching pinout and electrical interface. No PCB modifications are required for physical installation.

Q: What is the primary difference between these two parts?

A: The 24FC256-I/MF operates at 1 MHz I2C clock frequency with 400 ns access time. The 24AA256-I/MF operates at 400 kHz I2C clock frequency with 900 ns access time. Both maintain identical memory capacity, organization, and voltage specifications.

Q: Are there any voltage or temperature compatibility issues?

A: No. Both parts operate across the identical voltage range of 1.7V to 5.5V and the same temperature range of -40°C to 85°C. No circuit modifications are necessary.

Q: Which part should be selected for high-speed I2C applications?

A: The 24FC256-I/MF is specified for 1 MHz operation and should be selected for applications requiring maximum I2C clock frequency. The 24AA256-I/MF is limited to 400 kHz operation.

Q: Do both parts have the same write cycle time?

A: Yes. Both the 24FC256-I/MF and 24AA256-I/MF have identical write cycle time of 5 ms for word and page operations.

Q: Are there any compliance or certification differences?

A: No. Both parts maintain identical RoHS3 compliance, REACH unaffected status, and active product status from Microchip Technology.