AT25320A-10PI-2.7 Equivalent & Substitute Parts

Part Overview

The AT25320A-10PI-2.7 is a 32Kbit EEPROM memory IC with SPI interface manufactured by Microchip Technology. This device operates at 20 MHz clock frequency and supports a supply voltage range of 2.7V to 5.5V. The part is currently classified as obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations. Substitute parts must maintain functional equivalence in memory capacity, interface protocol, and electrical characteristics while accommodating the obsolete status of the original component.

Substiute Parts

AT25320A-10PI-2.7

Microchip TechnologyIn Stock: 933AT25320A-10PI-2.7 Datasheet

Current PartRFQ

25AA320A-I/P

Microchip TechnologyIn Stock: 113725AA320A-I/P Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution compatibility for the AT25320A-10PI-2.7 is determined by the following critical parameters:

• Memory Capacity & Organization: Substitute parts must provide 32Kbit capacity in 4K x 8 organization to ensure direct functional replacement
• Interface Protocol: SPI interface is mandatory for signal compatibility with existing circuit designs
• Package & Pinout: 8-DIP through-hole package with 0.300" (7.62mm) spacing ensures mechanical and electrical compatibility with PCB layouts
• Voltage Supply Range: Substitute parts must support the system supply voltage; parts with extended or equivalent voltage ranges are acceptable
• Clock Frequency: The substitute part's maximum clock frequency must meet or exceed the application's timing requirements
• Write Cycle Time: Must not exceed the original specification to maintain data write performance

The 25AA320A-I/P qualifies as a direct substitute based on matching memory capacity, organization, interface type, package configuration, and write cycle time specifications.

Parameter Comparison

Engineering Selection Recommendations

The 25AA320A-I/P is a qualified substitute for the AT25320A-10PI-2.7 based on the following engineering criteria:

Functional Equivalence: Both devices provide identical 32Kbit SPI EEPROM functionality with matching memory organization, interface protocol, package configuration, and write cycle performance.

Voltage Compatibility: The 25AA320A-I/P supports an extended supply voltage range (1.8V ~ 5.5V) that encompasses the original part's specification (2.7V ~ 5.5V), ensuring operation across all original design voltage conditions.

Clock Frequency Consideration: The substitute operates at 10 MHz maximum clock frequency compared to the original 20 MHz specification. This lower frequency is acceptable for applications where the SPI bus operates at or below 10 MHz. Applications requiring 20 MHz operation must verify that the substitute's lower frequency meets timing requirements.

Compliance Status: The 25AA320A-I/P is an active product with ROHS3 compliance, providing long-term availability and meeting current environmental regulations, whereas the original AT25320A-10PI-2.7 is obsolete and RoHS non-compliant.

Inventory Availability: The substitute part maintains active production status with confirmed inventory, ensuring reliable procurement for both new designs and legacy system support.

Frequently Asked Questions (FAQ)

Q: Can the 25AA320A-I/P directly replace the AT25320A-10PI-2.7 in existing designs?

A: Yes, for applications operating at SPI clock frequencies of 10 MHz or lower. Both devices share identical memory capacity, organization, interface protocol, package type, and pinout. If your application requires SPI operation above 10 MHz, verify that the lower clock frequency of the substitute meets your timing requirements before implementation.

Q: What is the key difference between these two parts?

A: The primary difference is clock frequency: the AT25320A-10PI-2.7 operates at 20 MHz, while the 25AA320A-I/P operates at 10 MHz. The substitute also features an extended lower voltage range (1.8V minimum vs. 2.7V minimum) and current RoHS3 compliance versus the original's non-compliance status.

Q: Are the packages identical?

A: Yes. Both parts use 8-DIP through-hole packaging with 0.300" (7.62mm) spacing, ensuring identical PCB footprint and pinout compatibility.

Q: Why is the original part obsolete?

A: The AT25320A-10PI-2.7 has been discontinued by Microchip Technology. The 25AA320A-I/P represents the current active product line for equivalent 32Kbit SPI EEPROM functionality.

Q: Does the substitute meet environmental compliance requirements?

A: Yes. The 25AA320A-I/P is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards. The original AT25320A-10PI-2.7 is RoHS non-compliant.

Q: Can I use the substitute in a 20 MHz SPI application?

A: No. The 25AA320A-I/P is specified for maximum 10 MHz operation. Using it in a 20 MHz application may result in timing violations and data integrity issues. Verify your actual SPI clock frequency before substitution.