AT25640-10PC-2.7 Equivalent & Substitute Parts

Part Overview

The AT25640-10PC-2.7 is a 64Kbit EEPROM memory IC manufactured by Microchip Technology, featuring SPI interface operation at 3 MHz with 8-DIP through-hole packaging. This device is classified as obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations. The part operates across a 2.7V to 5.5V supply voltage range with standard industrial temperature specifications of 0°C to 70°C.

Substiute Parts

AT25640-10PC-2.7

Microchip TechnologyIn Stock: 2322AT25640-10PC-2.7 Datasheet

Current PartRFQ

25LC640A-E/P

Microchip TechnologyIn Stock: 128525LC640A-E/P Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution compatibility for the AT25640-10PC-2.7 is determined by the following critical parameters:

• Memory Capacity: 64Kbit with 8K x 8 organization
• Interface Protocol: SPI communication standard
• Package Configuration: 8-DIP through-hole form factor (0.300", 7.62mm)
• Voltage Compatibility: Supply range must encompass or overlap with 2.7V ~ 5.5V
• Write Cycle Time: 5ms specification
• Mounting Technology: Through-hole compatibility

The 25LC640A-E/P qualifies as a direct substitute based on matching memory capacity, organization, SPI interface, identical package type, and compatible write cycle time. Enhanced specifications in clock frequency and operating temperature range provide improved performance margins without compromising backward compatibility.

Parameter Comparison

Engineering Selection Recommendations

The 25LC640A-E/P is the qualified substitute for AT25640-10PC-2.7 applications. Selection rationale is based on the following factors:

Product Status: The 25LC640A-E/P maintains active product status with ongoing manufacturer support, whereas the AT25640-10PC-2.7 is obsolete and subject to supply discontinuation.

Compliance Certification: The 25LC640A-E/P achieves ROHS3 compliance, meeting current environmental and regulatory requirements. The original AT25640-10PC-2.7 does not meet RoHS standards.

Functional Equivalence: Both devices share identical memory capacity, organization, SPI interface protocol, write cycle timing, and physical package dimensions, ensuring direct functional replacement without circuit modification.

Performance Enhancement: The 25LC640A-E/P provides extended operating temperature range (-40°C to 125°C) and higher clock frequency capability (10 MHz) compared to the original specification, offering improved operational margins for demanding applications.

Frequently Asked Questions (FAQ)

Q: Can the 25LC640A-E/P directly replace the AT25640-10PC-2.7 without PCB modifications?

A: Yes. Both devices use identical 8-DIP through-hole packaging with matching pin configurations and SPI interface protocol. No PCB layout changes are required for physical or electrical substitution.

Q: What are the voltage supply compatibility considerations?

A: The AT25640-10PC-2.7 operates from 2.7V to 5.5V. The 25LC640A-E/P operates from 2.5V to 5.5V. The substitute part accepts lower minimum voltage (2.5V), making it compatible with all applications designed for the original part's voltage range.

Q: Does the higher clock frequency of the 25LC640A-E/P affect system compatibility?

A: No. The 25LC640A-E/P supports 10 MHz operation, while the original AT25640-10PC-2.7 operates at 3 MHz. Systems designed for 3 MHz operation will function correctly with the substitute part, which is backward compatible at lower clock frequencies.

Q: Are there temperature range implications for substitution?

A: The 25LC640A-E/P extends the operating temperature range to -40°C to 125°C compared to the original 0°C to 70°C specification. This provides enhanced performance margins for applications operating at temperature extremes, with no negative impact on standard industrial temperature environments.

Q: What is the significance of RoHS compliance differences?

A: The 25LC640A-E/P meets ROHS3 compliance standards, while the AT25640-10PC-2.7 does not. For applications subject to RoHS regulatory requirements or customer specifications, the substitute part satisfies current environmental compliance mandates.

Q: Is the write cycle time identical between both parts?

A: Yes. Both the AT25640-10PC-2.7 and 25LC640A-E/P specify 5ms write cycle time, ensuring equivalent data programming performance and timing-critical application compatibility.