AT25128-10PI Equivalent & Substitute Parts

Part Overview

The AT25128-10PI is a 128Kbit EEPROM memory IC manufactured by Microchip Technology, featuring SPI interface operation at 3 MHz with 8-PDIP through-hole packaging. This part is classified as obsolete, making identification of compatible alternatives essential for ongoing system support and new design implementations. The obsolete status necessitates evaluation of active production equivalents that maintain functional compatibility while meeting current supply chain requirements.

Substiute Parts

AT25128-10PI

Microchip TechnologyIn Stock: 807AT25128-10PI Datasheet

Current PartRFQ

25AA128-I/P

Microchip TechnologyIn Stock: 239225AA128-I/P Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution compatibility for the AT25128-10PI is determined by the following critical parameters:

• Memory Capacity & Organization: Must maintain 128Kbit capacity with 16K x 8 organization to ensure address space and data width compatibility
• Interface Protocol: SPI interface is mandatory for signal compatibility with existing host controllers
• Package & Pinout: 8-DIP through-hole package with identical physical dimensions (0.300", 7.62mm) ensures mechanical and electrical socket compatibility
• Operating Temperature Range: Must support the full -40°C ~ 85°C range for thermal environment compatibility
• Write Cycle Time: 5ms specification must be maintained or improved to ensure timing compatibility

The 25AA128-I/P meets all substitution criteria while offering enhanced specifications in clock frequency and supply voltage range flexibility.

Parameter Comparison

Engineering Selection Recommendations

The 25AA128-I/P is a direct functional substitute for the AT25128-10PI based on matching memory capacity, organization, interface protocol, package configuration, and thermal operating range. The substitute part offers two significant advantages: active production status ensuring long-term availability, and ROHS3 compliance meeting current environmental and regulatory standards. The enhanced clock frequency specification (10 MHz versus 3 MHz) and expanded lower voltage support (1.8V minimum) provide operational flexibility without compromising backward compatibility. Both parts maintain identical write cycle timing and package dimensions, enabling direct socket replacement in existing designs.

Frequently Asked Questions (FAQ)

Q: Can the 25AA128-I/P directly replace the AT25128-10PI in existing circuit boards?

A: Yes. Both parts share identical 8-DIP package dimensions, pinout configuration, SPI interface protocol, memory capacity, and operating temperature range. Direct socket replacement is supported without circuit modification.

Q: What is the significance of the clock frequency difference (3 MHz vs. 10 MHz)?

A: The 25AA128-I/P operates at a higher maximum clock frequency, which is backward compatible with systems designed for 3 MHz operation. The substitute part can operate at the original 3 MHz specification or at higher speeds up to 10 MHz, depending on host controller capability.

Q: Does the expanded voltage range (1.8V ~ 5.5V) of the 25AA128-I/P affect compatibility?

A: No. The substitute part's wider voltage range is a superset of the original part's 4.5V ~ 5.5V range. Systems operating within the original voltage specification remain fully compatible.

Q: Why is RoHS compliance important for this substitution?

A: The 25AA128-I/P's ROHS3 compliance meets current environmental regulations and manufacturing standards. This is particularly relevant for new designs and systems subject to regulatory requirements, whereas the obsolete AT25128-10PI does not meet these standards.

Q: Are there any timing considerations when substituting these parts?

A: No. Both parts maintain identical 5ms write cycle time specifications. No timing adjustments are required in host controller firmware or circuit design.