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

Part Overview

The 25LC320AX-I/ST is a 32Kbit Serial Peripheral Interface (SPI) EEPROM memory IC manufactured by Microchip Technology, supplied in 8-TSSOP surface mount packaging. 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 85°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 type, and electrical operating parameters to ensure functional interchangeability in circuit applications.

Key Parameters

Parameter	Value
Memory Size	32Kbit
Memory Organization	4K x 8
Memory Interface	SPI
Clock Frequency	10 MHz
Write Cycle Time	5ms
Voltage Supply Range	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-TSSOP
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 25LC320AX-I/ST are classified based on the following substitution criteria:

Primary Substitution Parameters:

Memory capacity: 32Kbit
Memory organization: 4K x 8
Interface protocol: SPI
Package type: 8-TSSOP (0.173", 4.40mm Width)
Write cycle time: 5ms
Operating temperature range: -40°C to 85°C minimum
RoHS compliance: ROHS3 Compliant

Voltage Supply Compatibility: Parts with supply voltage ranges that encompass or exceed the 2.5V ~ 5.5V requirement are considered compatible. Parts with lower minimum voltage thresholds (1.8V or 1.7V) remain functionally compatible in applications operating within the 2.5V ~ 5.5V window.

Clock Frequency Consideration: The 25LC320AX-I/ST operates at 10 MHz. Substitute parts operating at 20 MHz clock frequency are backward compatible, as higher clock speeds do not restrict operation at lower frequencies in SPI protocol implementations.

Packaging Variants: The 8-TSSOP package specification is maintained across all substitutes. Minor package designation variations (8-TSSOP-B, 8-VSSOP, 8-MSOP) represent equivalent footprints suitable for direct PCB replacement.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Voltage Supply	Operating Temp	Package	Status
25LC320AX-I/ST	Microchip Technology	32Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
25AA320A-I/ST	Microchip Technology	32Kbit	10 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
25AA320AX-I/ST	Microchip Technology	32Kbit	10 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
25LC320A-I/ST	Microchip Technology	32Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
AT25320B-XHL-B	Microchip Technology	32Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
AT25320B-XHL-T	Microchip Technology	32Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
BR25S320FVM-WTR	Rohm Semiconductor	32Kbit	20 MHz	1.7V ~ 5.5V	-40°C ~ 85°C	8-MSOP	Active
BR25S320FVT-WE2	Rohm Semiconductor	32Kbit	20 MHz	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
CAT25320YI-GT3	onsemi	32Kbit	10 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
CAV25320YE-GT3	onsemi	32Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active
M95320-DFDW6TP	STMicroelectronics	32Kbit	20 MHz	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active

Engineering Selection Recommendations

Direct Substitutes (Microchip Technology 25-Series): The 25AA320A-I/ST, 25AA320AX-I/ST, and 25LC320A-I/ST are direct functional equivalents within the Microchip 25-series EEPROM family. These parts maintain identical memory capacity, organization, interface protocol, and package specifications. The 25AA320 variants support extended lower voltage operation (1.8V minimum) compared to the 25LC320AX-I/ST (2.5V minimum), providing additional design flexibility in low-power applications while remaining fully compatible at standard operating voltages.

Higher Clock Frequency Alternatives (20 MHz): The AT25320B-XHL-B, AT25320B-XHL-T, BR25S320FVT-WE2, and M95320-DFDW6TP operate at 20 MHz clock frequency, providing enhanced performance headroom. These parts are functionally compatible in applications designed for 10 MHz operation, as SPI protocol allows operation at reduced clock speeds. The AT25320B variants are Microchip-manufactured parts with verified programmability status. The BR25S320FVT-WE2 (Rohm Semiconductor) and M95320-DFDW6TP (STMicroelectronics) provide cross-manufacturer alternatives with equivalent electrical specifications.

Automotive-Grade Option: The CAV25320YE-GT3 is an automotive-qualified part (AEC-Q100) with extended operating temperature range (-40°C to 125°C) and identical voltage supply specifications to the 25LC320AX-I/ST. This part is suitable for applications requiring automotive-grade reliability and temperature performance.

Package Variant Consideration: The BR25S320FVM-WTR uses 8-MSOP packaging (0.110", 2.80mm Width) instead of 8-TSSOP. While electrically equivalent, this package variant requires PCB layout modification and is not a direct drop-in replacement.

Compliance and Production Status: All listed substitute parts maintain ROHS3 compliance and active production status, ensuring long-term availability and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can I use a 20 MHz EEPROM part as a substitute for the 10 MHz 25LC320AX-I/ST? A: Yes. Parts such as AT25320B-XHL-T and M95320-DFDW6TP operate at 20 MHz but are fully compatible in applications designed for 10 MHz operation. SPI protocol allows clock frequency reduction without functional impact. The higher clock speed provides performance margin but does not restrict operation at lower frequencies.

Q: What is the difference between 25AA320 and 25LC320 series parts? A: The primary difference is the minimum supply voltage specification. The 25AA320 series supports 1.8V minimum supply voltage, while the 25LC320 series requires 2.5V minimum. Both series are functionally identical in memory capacity, organization, interface, and package. Selection depends on the application's minimum supply voltage requirement.

Q: Are Rohm Semiconductor BR25S320 parts compatible with Microchip 25LC320AX-I/ST? A: Yes. The BR25S320FVT-WE2 is electrically and functionally equivalent, with identical memory specifications, SPI interface, 8-TSSOP package, and operating temperature range. The BR25S320FVM-WTR variant uses 8-MSOP packaging, which requires PCB layout verification before substitution.

Q: Can I substitute the 25LC320AX-I/ST with a CAV25320YE-GT3 automotive part? A: Yes. The CAV25320YE-GT3 is a direct functional equivalent with identical voltage supply range (2.5V ~ 5.5V), memory specifications, and package type. The automotive qualification and extended temperature range (-40°C to 125°C) provide additional performance margin for standard industrial applications.

Q: What packaging considerations apply when selecting substitute parts? A: The 25LC320AX-I/ST uses 8-TSSOP packaging (0.173", 4.40mm Width). Most substitute parts maintain this package specification for direct PCB compatibility. The BR25S320FVM-WTR uses 8-MSOP packaging (0.110", 2.80mm Width), which has a different footprint and requires PCB layout modification. Verify package designation before component procurement.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance status, ensuring regulatory compliance and environmental standards alignment with the original 25LC320AX-I/ST specification.

Q: What is the significance of the write cycle time specification? A: The 5ms write cycle time is consistent across all listed substitute parts and the original 25LC320AX-I/ST. This parameter defines the maximum time required to complete a single page write operation and is critical for timing-sensitive applications. Identical write cycle time ensures functional compatibility without firmware or timing adjustment.

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