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Microchip Technology 24LC128T-I/SN — Discrete Semiconductors

Microchip 24LC128T-I/SN EEPROM, 128Kbit I²C, 8-SOIC

MPN24LC128T-I/SN
End of Life

Microchip Technology 24LC128T-I/SN EEPROM, 128Kbit, I²C, 900 ns access, 2.5-5.5V, -40 to +85°C, 8-SOIC, Tape & Reel.

$0.75Ref. price · indicative, final on quote
Microchip Technology 24LC128T-I/SN datasheet (PDF)
Packaging8-SOIC (0.154", 3.90mm Width)
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

24LC128T-I/SN specifications
ParameterValue
Memory typeNon-Volatile
MountingSurface Mount
Supply voltage2.5V ~ 5.5V
Clock frequency400 kHz
Memory interfaceI²C
Operating temperature-40°C ~ 85°C (TA)
PackageTape & Reel (TR); Cut Tape (CT)
TechnologyEEPROM
Access time900 ns
Memory size128Kbit
Memory formatEEPROM
Case8-SOIC (0.154\", 3.90mm Width)
Memory organization16K x 8
Write cycle time - word, page5ms

Product details

128Kbit I²C EEPROM in 8-SOIC — active production, industrial temp

The Microchip Technology 24LC128T-I/SN is a 128Kbit serial EEPROM organized as 16K x 8 bits, accessed through an I²C interface at clock frequencies up to 400 kHz.

Second-source fit — 24AA128T-I/SN drop-in with voltage caveat

The 24AA128T-I/SN is pin-compatible and functionally identical — same 128Kbit density, same I²C interface, same 8-SOIC package, same 900 ns access time and 5 ms write cycle. The critical difference is the supply voltage: the 24AA128T-I/SN operates from 1.7V up, while the 24LC128T-I/SN requires a minimum of 2.5V. A board designed for the 24LC128T-I/SN at 3.3V or 5V will accept the 24AA128T-I/SN without rewiring, but the reverse is not guaranteed — the 24LC128T-I/SN will not run on a 1.8V rail.

Fully ROHS3 compliant, with no restricted substances above the threshold limits under EU Directive 2011/65/EU.

Frequently asked questions

Will 24LC128T-I/SN drop into a board that was specified around 24AA128T-I/SN without rewiring?

Yes — the two parts share the same 8-SOIC package, pinout, and I²C interface. The 24LC128T-I/SN requires a minimum supply of 2.5V, so it will not work on a 1.8V rail. If the board runs at 3.3V or 5V, the 24LC128T-I/SN is a direct drop-in replacement with no board change.

What compliance documentation does Microchip Technology provide for 24LC128T-I/SN?

The part is ROHS3 compliant. Microchip provides a Certificate of Compliance (CoC) and material declaration upon request through the supply chain. No REACH, UL, or IEC certification is listed on the standard product record.