25LC320AX-E/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 25LC320AX-E/ST is a 32Kbit Serial Peripheral Interface (SPI) EEPROM memory IC manufactured by Microchip Technology in an 8-TSSOP surface mount package. This non-volatile memory device operates at 10 MHz clock frequency with a 5ms write cycle time and supports supply voltages from 2.5V to 5.5V across an operating temperature range of -40°C to 125°C. The part is ROHS3 compliant and currently in active production status. Equivalent and substitute parts are identified based on matching memory capacity, interface protocol, package form factor, and electrical operating parameters to ensure functional interchangeability in circuit applications.

Substiute Parts

25LC320AX-E/ST

Microchip TechnologyIn Stock: 68225LC320AX-E/ST Datasheet

Current PartRFQ

AT25320B-XHL-T

Microchip TechnologyIn Stock: 15775AT25320B-XHL-T Datasheet

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CAT25320YI-GT3

onsemiIn Stock: 2160CAT25320YI-GT3 Datasheet

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CAV25320YE-GT3

onsemiIn Stock: 1448CAV25320YE-GT3 Datasheet

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M95320-DFDW6TP

STMicroelectronicsIn Stock: 5050M95320-DFDW6TP Datasheet

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M95320-DRDW3TP/K

STMicroelectronicsIn Stock: 16323M95320-DRDW3TP/K Datasheet

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M95320-DWDW4TP/K

STMicroelectronicsIn Stock: 4848M95320-DWDW4TP/K Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 25LC320AX-E/ST are qualified based on the following critical parameters:

Primary Matching Criteria:

• Memory capacity: 32Kbit
• Memory organization: 4K x 8
• Interface protocol: SPI
• Package type: 8-TSSOP with 0.173" width and 4.40mm dimensions
• Mounting method: Surface mount

Secondary Compatibility Parameters:

• Clock frequency: 10 MHz or higher (backward compatible)
• Supply voltage range: Must encompass or overlap with 2.5V ~ 5.5V
• Write cycle time: 5ms or faster
• Operating temperature range: Must support -40°C minimum and 125°C maximum, or equivalent industrial/automotive grade specifications
• RoHS compliance: ROHS3 status maintained

Substitutes are grouped by manufacturer and specific electrical characteristics. Parts with higher clock frequencies (20 MHz) or extended temperature ranges remain functionally compatible. Automotive-grade parts with AEC-Q100 qualification provide enhanced reliability for demanding applications.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent (Identical Specifications): CAV25320YE-GT3 provides the closest functional match with identical memory capacity, clock frequency, supply voltage range, and operating temperature span. Both parts maintain ROHS3 compliance and 8-TSSOP packaging. The CAV25320YE-GT3 includes automotive-grade qualification (AEC-Q100), making it suitable for applications requiring enhanced reliability.

Higher Performance Substitutes (20 MHz Clock): AT25320B-XHL-T, M95320-DFDW6TP, and M95320-DRDW3TP/K operate at 20 MHz, providing double the clock frequency while maintaining backward compatibility. These parts are suitable for applications where higher data transfer rates are beneficial. M95320-DRDW3TP/K additionally offers automotive qualification and extended temperature operation to 125°C.

Extended Temperature Operation: M95320-DWDW4TP/K supports the widest operating temperature range (-40°C to 145°C) with automotive qualification, making it optimal for high-temperature industrial and automotive applications. This part maintains the original 10 MHz clock frequency and 2.5V to 5.5V supply range.

Lower Supply Voltage Compatibility: AT25320B-XHL-T, CAT25320YI-GT3, and M95320-DFDW6TP support operation down to 1.8V or 1.7V, enabling use in low-power applications. These parts remain fully compatible with standard 3.3V and 5V logic systems.

All substitute parts maintain ROHS3 compliance, identical memory organization (4K x 8), SPI interface protocol, and 8-TSSOP package dimensions, ensuring direct PCB compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 25LC320AX-E/ST with a 20 MHz variant like the M95320-DRDW3TP/K?

A: Yes. The 20 MHz variants are fully backward compatible. Higher clock frequency does not affect operation in circuits designed for 10 MHz devices. The SPI interface remains identical, and all timing parameters are met or exceeded.

Q: What is the difference between automotive-grade and standard EEPROM parts?

A: Automotive-grade parts (CAV25320YE-GT3, M95320-DRDW3TP/K, M95320-DWDW4TP/K) carry AEC-Q100 qualification, indicating enhanced reliability testing and extended operating temperature ranges. These are required for automotive and high-reliability industrial applications. Standard parts are suitable for consumer and general industrial use.

Q: Are all substitute parts in the same 8-TSSOP package?

A: Yes. All listed substitutes use the 8-TSSOP package with 0.173" width and 4.40mm dimensions, ensuring identical PCB footprint and pin compatibility. No layout changes are required for substitution.

Q: Which substitute offers the best performance improvement?

A: M95320-DRDW3TP/K provides the best overall performance with 20 MHz clock frequency, 4ms write cycle time (faster than the original 5ms), automotive qualification, and extended temperature range to 125°C. It is suitable for demanding applications requiring higher speed and reliability.

Q: Can I use a substitute with a lower supply voltage range?

A: Substitutes with lower minimum supply voltages (1.7V or 1.8V) are compatible with the original 2.5V to 5.5V range. However, if your circuit operates below 2.5V, only parts specifying lower minimum voltages (AT25320B-XHL-T, CAT25320YI-GT3, M95320-DFDW6TP, M95320-DRDW3TP/K) are suitable.

Q: Is the 25LC320AX-E/ST still in production?

A: Yes. The 25LC320AX-E/ST maintains active product status with 644 units in current inventory. All listed substitutes are also in active production with higher inventory levels, ensuring long-term availability.