24LC128-I/PG EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24LC128-I/PG is a 128Kbit I2C EEPROM memory IC manufactured by Microchip Technology in 8-DIP through-hole packaging. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The 24LC128-I/PG operates across a 2.5V to 5.5V supply range with a 400 kHz I2C interface, 900 ns access time, and supports industrial temperature ranges from -40°C to 85°C.

Substiute Parts

24LC128-I/PG

Microchip TechnologyIn Stock: 93124LC128-I/PG Datasheet

Current PartRFQ

24LC128-I/P

Microchip TechnologyIn Stock: 281924LC128-I/P Datasheet

DirectRFQ

24AA128-I/P

Microchip TechnologyIn Stock: 154424AA128-I/P Datasheet

MFR RecommendedRFQ

24FC128-I/P

Microchip TechnologyIn Stock: 2027224FC128-I/P Datasheet

MFR RecommendedRFQ

24LC128-E/P

Microchip TechnologyIn Stock: 181324LC128-E/P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 24LC128-I/PG is determined by the following critical parameters: memory size (128Kbit), memory organization (16K x 8), I2C interface protocol, package type (8-DIP through-hole), and voltage supply compatibility. All substitute parts maintain identical memory capacity and organization, ensuring functional equivalence at the system level.

Substitute parts are grouped into two categories based on operational specifications:

Category 1: Direct Electrical Equivalents — Parts maintaining identical clock frequency (400 kHz), access time (900 ns), and voltage supply range (2.5V ~ 5.5V). These parts provide one-to-one replacement capability without design modification.

Category 2: Enhanced Performance Variants — Parts with improved electrical characteristics such as higher clock frequency (1 MHz) or extended voltage supply range (1.7V ~ 5.5V). These parts are backward compatible but offer additional operational flexibility.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: 24LC128-I/P — This part is the direct functional equivalent with identical electrical specifications and active product status. It provides the most straightforward replacement path for obsolete 24LC128-I/PG applications.

Extended Temperature Option: 24LC128-E/P — Select this variant for applications requiring extended operating temperature range up to 125°C. All other electrical parameters remain identical to the original part.

Low-Voltage Compatible Option: 24AA128-I/P — This part extends the minimum supply voltage to 1.7V, enabling use in low-power applications. Clock frequency and access time remain unchanged from the original specification.

High-Speed Option: 24FC128-I/P — This variant provides 1 MHz clock frequency and 400 ns access time, offering improved performance for timing-critical applications. It also supports extended voltage range (1.7V ~ 5.5V). This part is backward compatible with 400 kHz I2C bus implementations.

All substitute parts maintain ROHS3 compliance, identical package geometry (8-DIP through-hole), and 16K x 8 memory organization, ensuring mechanical and functional compatibility with existing PCB designs.

Frequently Asked Questions (FAQ)

Q: Can 24LC128-I/P directly replace 24LC128-I/PG without PCB modification?

A: Yes. The 24LC128-I/P is electrically and mechanically identical to the 24LC128-I/PG. Both use 8-DIP through-hole packaging with identical pin configuration, voltage supply range, and I2C interface specifications. No design changes are required.

Q: What is the difference between 24LC128-I/P and 24LC128-E/P?

A: The primary difference is operating temperature range. The 24LC128-E/P supports -40°C to 125°C, while the 24LC128-I/P supports -40°C to 85°C. All other electrical parameters are identical. Select 24LC128-E/P for applications requiring extended high-temperature operation.

Q: Can 24FC128-I/P be used as a drop-in replacement?

A: Yes, with design considerations. The 24FC128-I/P is mechanically compatible and maintains I2C protocol compatibility. However, it operates at 1 MHz clock frequency versus 400 kHz for the original part. Existing I2C bus implementations at 400 kHz will operate correctly with 24FC128-I/P, as the part supports lower clock speeds. The improved access time (400 ns versus 900 ns) provides performance headroom.

Q: What is the advantage of 24AA128-I/P over 24LC128-I/P?

A: The 24AA128-I/P supports a lower minimum supply voltage of 1.7V compared to 2.5V for 24LC128-I/P. This enables operation in low-power battery-powered applications. All other electrical specifications remain identical.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and are suitable for applications with RoHS requirements.

Q: Does package type differ between substitute parts?

A: No. All substitute parts use identical 8-DIP (0.300", 7.62mm) through-hole packaging, ensuring mechanical compatibility with existing PCB layouts.