AT24C128N-10SC Equivalent & Substitute Parts

Part Overview

The AT24C128N-10SC is a 128Kbit EEPROM memory IC with I2C interface manufactured by Microchip Technology. This device is classified as obsolete, which necessitates identification of functionally equivalent alternatives for new designs and ongoing system support. The part operates at 1 MHz clock frequency with 550 ns access time and requires a 4.5V to 5.5V supply voltage. Its 8-SOIC surface mount package and I2C protocol make it suitable for embedded systems requiring non-volatile memory storage.

Substiute Parts

AT24C128N-10SC

Microchip TechnologyIn Stock: 10463AT24C128N-10SC Datasheet

Current PartRFQ

24FC128-I/SN

Microchip TechnologyIn Stock: 152724FC128-I/SN Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT24C128N-10SC is determined by the following critical parameters:

• Memory capacity (128Kbit) and organization (16K x 8)
• I2C serial interface protocol
• 8-SOIC package footprint compatibility
• Pin-to-pin functional equivalence

The 24FC128-I/SN qualifies as a direct substitute based on matching memory size, organization, interface type, and package. This part maintains identical electrical and mechanical specifications required for drop-in replacement, with the exception of enhanced performance characteristics and expanded operating conditions.

Parameter Comparison

Engineering Selection Recommendations

The 24FC128-I/SN is the recommended substitute for the obsolete AT24C128N-10SC. Selection is based on the following factors:

• The substitute maintains active product status, ensuring long-term availability and supply chain continuity
• ROHS3 compliance of the 24FC128-I/SN satisfies current regulatory requirements, whereas the AT24C128N-10SC is non-compliant
• Electrical performance of the substitute exceeds the original part, with faster access time (400 ns vs. 550 ns) and reduced write cycle time (5ms vs. 10ms)
• Extended operating temperature range (-40°C to 85°C) and wider supply voltage range (1.7V to 5.5V) provide greater design flexibility
• Identical package footprint and I2C interface ensure direct PCB compatibility without layout modifications
• Pin-to-pin functional equivalence permits direct replacement in existing designs

Frequently Asked Questions (FAQ)

Q: Can the 24FC128-I/SN be used as a direct replacement for the AT24C128N-10SC?

A: Yes. Both devices share identical memory capacity (128Kbit), organization (16K x 8), I2C interface, clock frequency (1 MHz), and 8-SOIC package dimensions. The substitute is pin-to-pin compatible and requires no circuit modifications.

Q: What are the key differences between these parts?

A: The 24FC128-I/SN offers improved performance with faster access time (400 ns vs. 550 ns) and shorter write cycle time (5ms vs. 10ms). It also features a wider supply voltage range (1.7V to 5.5V vs. 4.5V to 5.5V) and extended operating temperature range (-40°C to 85°C vs. 0°C to 70°C). The substitute is ROHS3 compliant and maintains active product status.

Q: Are there any compatibility concerns with the package?

A: No. Both parts use the 8-SOIC package with identical 0.154" (3.90mm) width. PCB footprints are interchangeable without modification.

Q: Why is the AT24C128N-10SC obsolete?

A: The AT24C128N-10SC is classified as obsolete by the manufacturer. The 24FC128-I/SN represents the current active equivalent in Microchip Technology's product portfolio.

Q: Does the faster performance of the substitute affect system compatibility?

A: No. The substitute's faster access time and write cycle time are backward compatible. Systems designed for the original part will operate correctly with the improved performance characteristics of the substitute.

Q: What is the significance of ROHS3 compliance?

A: ROHS3 compliance indicates the substitute meets current European Union Restriction of Hazardous Substances regulations. This is required for products sold in regulated markets and is not supported by the obsolete AT24C128N-10SC.