AT24C256-10PI-1.8 Equivalent & Substitute Parts

Part Overview

The AT24C256-10PI-1.8 is a 256Kbit EEPROM memory IC with I2C interface manufactured by Microchip Technology. This device operates at 1.8V to 3.6V supply voltage and features a 400 kHz I2C clock frequency with 900 ns access time. The part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. Direct replacements are available from the same manufacturer with improved product status and compliance certifications.

Substiute Parts

AT24C256-10PI-1.8

Microchip TechnologyIn Stock: 982AT24C256-10PI-1.8 Datasheet

Current PartRFQ

24AA256-I/P

Microchip TechnologyIn Stock: 2011724AA256-I/P Datasheet

DirectRFQ

24LC256-I/P

Microchip TechnologyIn Stock: 448724LC256-I/P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by matching the following critical parameters: memory size (256Kbit), memory organization (32K x 8), I2C interface protocol, clock frequency (400 kHz), access time (900 ns), package type (8-DIP), and mounting method (Through Hole). The substitute parts listed below meet these core electrical and mechanical requirements. Voltage supply range variations are acceptable provided the operating voltage of the application falls within the substitute part's specified range. All substitute parts maintain identical pin configuration and I2C protocol compatibility.

Parameter Comparison

Engineering Selection Recommendations

The AT24C256-10PI-1.8 is obsolete and should be replaced in new designs. Both 24AA256-I/P and 24LC256-I/P are active products with ROHS3 compliance certification, making them suitable for production use.

The 24AA256-I/P supports the widest voltage supply range (1.7V ~ 5.5V) and is compatible with the original part's 1.8V minimum operating voltage. This part is recommended for applications requiring operation at the lower voltage boundary of the original specification.

The 24LC256-I/P operates within a 2.5V ~ 5.5V supply range and is suitable for applications where the minimum operating voltage is 2.5V or higher. Both substitute parts feature improved write cycle time (5ms versus 10ms) compared to the original part, providing performance enhancement in write-intensive applications.

Frequently Asked Questions (FAQ)

Q: Can 24AA256-I/P and 24LC256-I/P be used interchangeably with AT24C256-10PI-1.8?

A: Both parts are pin-compatible and functionally equivalent for I2C EEPROM applications. Selection depends on the application's voltage supply requirements. If the circuit operates at 1.8V to 2.4V, use 24AA256-I/P. If the circuit operates at 2.5V or higher, either part is acceptable.

Q: What is the impact of the different write cycle times?

A: The original AT24C256-10PI-1.8 requires 10ms per write cycle, while both substitutes require 5ms. This improvement does not affect compatibility; applications designed for the original part will function correctly with the faster substitutes.

Q: Are the package dimensions identical?

A: Yes. All three parts use 8-DIP packaging with 0.300" (7.62mm) body width and are mounted through holes. PCB layouts and sockets are fully compatible.

Q: What compliance certifications apply to the substitute parts?

A: Both 24AA256-I/P and 24LC256-I/P are ROHS3 compliant and REACH unaffected. The original AT24C256-10PI-1.8 is RoHS non-compliant, making the substitutes necessary for applications requiring RoHS certification.

Q: Is the I2C protocol identical across all three parts?

A: Yes. All parts implement the same I2C interface protocol at 400 kHz clock frequency with identical pin assignments and communication timing.