24FC128-I/MF EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24FC128-I/MF is a 128Kbit I2C EEPROM memory IC manufactured by Microchip Technology, designed for non-volatile data storage applications requiring serial communication. This component operates at 1 MHz clock frequency with 400 ns access time and is housed in an 8-DFN surface mount package. The part is currently in active production status with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent memory capacity, interface protocol, package type, and electrical specifications align within acceptable operational parameters.

Key Parameters

Parameter	Value
Memory Size	128Kbit
Memory Organization	16K x 8
Memory Interface	I2C
Clock Frequency	1 MHz
Access Time	400 ns
Write Cycle Time	5ms
Voltage Supply Range	1.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-DFN-S (6x5)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 24FC128-I/MF is determined by the following critical parameters:

Memory Specifications: Equivalent parts must maintain 128Kbit total capacity with 16K x 8 organization to ensure software compatibility and address space alignment.

Interface Protocol: I2C serial interface is mandatory for system integration without redesign of communication firmware or hardware.

Package Compatibility: 8-DFN-S (6x5) surface mount package ensures mechanical fit on existing PCB layouts and reflow soldering compatibility.

Electrical Characteristics: Supply voltage range of 1.7V ~ 5.5V and operating temperature range of -40°C ~ 85°C must be maintained or exceeded to guarantee operation across all specified conditions.

Performance Timing: Clock frequency, access time, and write cycle time parameters define system performance boundaries. Substitute parts with equal or superior timing specifications are acceptable.

Compliance Requirements: RoHS3 compliance and REACH unaffected status must be maintained for regulatory adherence.

Parameter Comparison

Parameter	24FC128-I/MF (Main Part)	24AA128-I/MF (Substitute)	Compatibility Notes
Memory Size	128Kbit	128Kbit	Identical
Memory Organization	16K x 8	16K x 8	Identical
Memory Interface	I2C	I2C	Identical
Clock Frequency	1 MHz	400 kHz	Substitute operates at lower frequency; acceptable for systems not requiring maximum speed
Access Time	400 ns	900 ns	Substitute has longer access time; acceptable for non-time-critical applications
Write Cycle Time	5ms	5ms	Identical
Voltage Supply Range	1.7V ~ 5.5V	1.7V ~ 5.5V	Identical
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	Identical
Package Type	8-DFN-S (6x5)	8-DFN-S (6x5)	Identical
Mounting Type	Surface Mount	Surface Mount	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical

Engineering Selection Recommendations

The 24AA128-I/MF qualifies as a direct substitute for the 24FC128-I/MF based on matching memory capacity, I2C interface protocol, package geometry, supply voltage range, operating temperature range, and regulatory compliance status. Both parts are manufactured by Microchip Technology and maintain active product status.

The primary performance differential is clock frequency (1 MHz versus 400 kHz) and access time (400 ns versus 900 ns). The substitute part operates at reduced speed specifications. Selection between these parts depends on system timing requirements. Applications with I2C bus speeds limited to 400 kHz or lower will experience no functional difference. Systems designed for 1 MHz I2C operation may encounter timing constraints with the substitute part.

Both parts carry identical RoHS3 compliance and REACH unaffected status, ensuring equivalent environmental and regulatory standing. Moisture sensitivity level remains unlimited for both variants.

Frequently Asked Questions (FAQ)

Q: Can the 24AA128-I/MF replace the 24FC128-I/MF in existing designs?

A: Yes, provided the system I2C bus speed does not exceed 400 kHz. The substitute part is electrically and mechanically compatible with identical package, pinout, voltage range, and temperature specifications. If your design operates at 1 MHz I2C speed, the substitute part's 400 kHz maximum frequency may limit performance.

Q: Are there differences in memory organization between these parts?

A: No. Both parts feature 128Kbit capacity organized as 16K x 8, ensuring identical address mapping and data storage structure.

Q: Do both parts support the same supply voltage range?

A: Yes. Both the 24FC128-I/MF and 24AA128-I/MF operate across 1.7V to 5.5V supply voltage, allowing use in identical power supply configurations.

Q: What is the impact of the 900 ns access time on the substitute part?

A: The 24AA128-I/MF has 500 ns longer access time compared to the main part. This affects data read latency but does not impact write operations, which both parts complete in 5ms. Systems with strict timing requirements for read operations should account for this difference.

Q: Are both parts RoHS compliant?

A: Yes. Both the 24FC128-I/MF and 24AA128-I/MF are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.

Q: Can I use the substitute part in high-speed I2C applications?

A: The 24AA128-I/MF is rated for 400 kHz I2C operation. Applications requiring 1 MHz I2C speed should use the 24FC128-I/MF to ensure specified performance.

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