AT25640-10PI EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The AT25640-10PI is a 64Kbit Serial Peripheral Interface (SPI) EEPROM memory IC manufactured by Microchip Technology, housed in an 8-DIP through-hole package. This device operates at 3 MHz clock frequency with a 4.5V to 5.5V supply voltage range and supports standard SPI communication protocols for non-volatile data storage applications.

The AT25640-10PI is classified as obsolete. Identifying compatible substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production or maintenance requirements for legacy systems utilizing this memory IC.

Substiute Parts

AT25640-10PI

Microchip TechnologyIn Stock: 764AT25640-10PI Datasheet

Current PartRFQ

25AA640A-I/P

Microchip TechnologyIn Stock: 378225AA640A-I/P Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT25640-10PI is determined by the following critical parameters:

• Memory Capacity: 64Kbit (8K x 8 organization) — substitute parts must provide identical storage capacity
• Memory Interface: SPI protocol — substitute parts must support SPI communication
• Package Type: 8-DIP through-hole form factor — substitute parts must use identical physical packaging
• Operating Temperature Range: -40°C ~ 85°C — substitute parts must support this temperature envelope
• Mounting Type: Through-hole — substitute parts must maintain through-hole mounting compatibility

The 25AA640A-I/P qualifies as a direct substitute based on these core parameters. While the substitute part offers enhanced specifications (10 MHz clock frequency, wider voltage range 1.8V ~ 5.5V, and improved RoHS compliance), it maintains full backward compatibility with the AT25640-10PI in terms of memory capacity, interface protocol, package geometry, and thermal operating range.

Parameter Comparison

Engineering Selection Recommendations

The 25AA640A-I/P is the qualified substitute for the AT25640-10PI based on the following engineering criteria:

Product Status: The AT25640-10PI is obsolete, while the 25AA640A-I/P maintains active production status. This ensures long-term component availability and supply chain continuity.

Compliance & Certifications: The 25AA640A-I/P achieves ROHS3 compliance, whereas the AT25640-10PI is RoHS non-compliant. Both parts carry identical REACH Unaffected and EAR99 ECCN classifications.

Functional Compatibility: The substitute part maintains identical memory capacity (64Kbit), organization (8K x 8), interface protocol (SPI), package geometry (8-DIP), and thermal operating range (-40°C ~ 85°C). The enhanced clock frequency (10 MHz versus 3 MHz) and expanded voltage range (1.8V ~ 5.5V versus 4.5V ~ 5.5V) provide performance headroom without introducing compatibility issues.

Frequently Asked Questions (FAQ)

Q: Can the 25AA640A-I/P directly replace the AT25640-10PI in existing designs?

A: Yes. Both parts share identical memory capacity, SPI interface, 8-DIP package geometry, and operating temperature range. The substitute part is pin-compatible and functionally equivalent for all standard SPI EEPROM operations.

Q: What are the key differences between these parts?

A: The 25AA640A-I/P operates at 10 MHz clock frequency compared to the AT25640-10PI's 3 MHz, and supports a wider supply voltage range (1.8V ~ 5.5V versus 4.5V ~ 5.5V). The substitute part also achieves ROHS3 compliance. These differences represent performance enhancements with no negative impact on backward compatibility.

Q: Are there any voltage supply considerations when substituting?

A: The 25AA640A-I/P accepts supply voltages as low as 1.8V, whereas the AT25640-10PI requires a minimum of 4.5V. Designs operating at 4.5V ~ 5.5V will function identically with either part. Designs requiring operation below 4.5V must use the 25AA640A-I/P.

Q: Does the higher clock frequency of the substitute part affect circuit design?

A: No. The 25AA640A-I/P's 10 MHz capability is backward compatible with systems designed for 3 MHz operation. Existing SPI bus configurations and timing parameters remain valid. The higher frequency capability provides design flexibility for future optimization without requiring circuit modifications.

Q: Are the package dimensions identical?

A: Yes. Both parts use the 8-DIP (0.300", 7.62mm) through-hole package with identical pin spacing and physical dimensions. PCB layouts and socket compatibility are fully preserved.