AT24C128-10PI EEPROM Equivalent & Substitute Parts

Part Overview

The AT24C128-10PI is a 128Kbit I2C EEPROM memory IC manufactured by Microchip Technology, housed in an 8-DIP package. This component is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. The part operates at 1 MHz clock frequency with 550 ns access time and requires a 4.5V to 5.5V supply voltage. Due to its obsolete status and non-RoHS3 compliance, identifying compatible alternatives is essential for system continuity and regulatory adherence.

Substiute Parts

AT24C128-10PI

Microchip TechnologyIn Stock: 1206AT24C128-10PI Datasheet

Current PartRFQ

24AA128-I/P

Microchip TechnologyIn Stock: 154424AA128-I/P Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT24C128-10PI is determined by the following critical parameters:

Memory Capacity & Organization: Both the main part and substitute must provide 128Kbit capacity in 16K x 8 organization to ensure software compatibility and address mapping equivalence.

Interface Protocol: I2C interface is mandatory. The substitute must support identical I2C communication protocol for direct replacement without firmware modification.

Package & Pinout: 8-DIP package with 0.300" (7.62mm) spacing is required for mechanical and electrical compatibility with existing PCB layouts.

Voltage Compatibility: The substitute must operate within or encompass the supply voltage range of the original part. Wider voltage ranges provide greater design flexibility.

Operating Temperature Range: The substitute must support the full -40°C to 85°C operating temperature range to maintain functional equivalence across environmental conditions.

Timing Specifications: Access time and write cycle time must be equal to or faster than the original part to ensure system timing requirements are met.

The 24AA128-I/P meets all substitution criteria while offering improved compliance and wider voltage tolerance.

Parameter Comparison

Engineering Selection Recommendations

The 24AA128-I/P is a direct functional substitute for the AT24C128-10PI based on the following engineering criteria:

Product Status: The AT24C128-10PI is obsolete, while the 24AA128-I/P maintains active production status, ensuring long-term availability and supply chain reliability.

Regulatory Compliance: The 24AA128-I/P is ROHS3 compliant, meeting current environmental and regulatory requirements. The original part is RoHS non-compliant, making the substitute necessary for new designs and updated manufacturing standards.

Electrical Compatibility: The substitute operates across a wider voltage range (1.7V to 5.5V) compared to the original (4.5V to 5.5V), providing enhanced flexibility for multi-voltage system designs while maintaining full compatibility with 5V systems.

Timing Performance: While the substitute operates at 400 kHz versus the original 1 MHz, and has a longer access time (900 ns versus 550 ns), these differences are acceptable for I2C EEPROM applications where timing margins are typically substantial. The faster write cycle time (5ms versus 10ms) provides an additional performance advantage.

Package Equivalence: Both parts use identical 8-DIP packaging with matching pinouts and mechanical dimensions, enabling direct PCB replacement without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the 24AA128-I/P directly replace the AT24C128-10PI on existing PCBs?

A: Yes. Both parts use identical 8-DIP packaging with matching pinouts and mechanical dimensions. No PCB modifications are required for direct substitution.

Q: What is the impact of the lower clock frequency (400 kHz vs. 1 MHz) on system performance?

A: I2C EEPROM applications typically operate well below maximum clock frequencies. The 400 kHz operation of the substitute is standard for I2C systems and will not impact functionality in designs originally specified for 1 MHz operation.

Q: Does the longer access time (900 ns vs. 550 ns) affect system compatibility?

A: No. I2C timing specifications include substantial margins. The 900 ns access time of the substitute remains well within typical system timing budgets and does not create compatibility issues.

Q: Why is RoHS3 compliance important for this substitution?

A: RoHS3 compliance is a regulatory requirement for components used in new designs and updated manufacturing processes. The substitute's compliance ensures adherence to current environmental standards and facilitates market acceptance.

Q: Is the wider voltage range (1.7V to 5.5V) of the substitute beneficial?

A: Yes. The extended lower voltage limit enables use in low-power applications and multi-voltage systems while maintaining full compatibility with the original 4.5V to 5.5V specification.

Q: Are there any firmware or software modifications required when switching to the 24AA128-I/P?

A: No. Both parts implement identical I2C protocol, memory organization (16K x 8), and addressing schemes. No firmware or software changes are necessary.

Q: What is the availability status of each part?

A: The AT24C128-10PI is obsolete with limited remaining inventory. The 24AA128-I/P is in active production with established supply chains, ensuring reliable long-term availability.