25AA320AX-I/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 25AA320AX-I/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 across a wide supply voltage range of 1.8V to 5.5V and maintains functionality across industrial temperature ranges from -40°C to 85°C. The part is ROHS3 compliant and carries an active product status. Equivalent and substitute parts are identified based on matching memory capacity, interface protocol, package type, and electrical operating parameters to ensure direct functional replacement in circuit designs.

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	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 25AA320AX-I/ST is determined by the following critical parameters:

Memory Capacity: All substitutes must provide 32Kbit storage with 4K x 8 organization
Interface Protocol: SPI interface is mandatory for circuit compatibility
Package Configuration: 8-TSSOP surface mount package with 0.173" width (4.40mm) ensures PCB footprint compatibility
Supply Voltage Range: Minimum 1.8V to maximum 5.5V operating range accommodates the main part's specifications
Operating Temperature: -40°C to 85°C industrial range is the baseline requirement
Write Cycle Time: 5ms specification is acceptable; faster cycle times do not disqualify substitutes

Substitutes are grouped into two categories based on clock frequency capability: parts operating at 10 MHz match the main part exactly, while parts rated for 20 MHz operation provide enhanced performance within the same functional parameters and are fully compatible for direct replacement.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Memory Size	Clock Frequency	Voltage Supply	Operating Temperature	Package	Write Cycle Time	MSL Rating	Product Status
25AA320AX-I/ST	Microchip Technology	32Kbit	10 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	5ms	1 (Unlimited)	Active
25AA320A-I/ST	Microchip Technology	32Kbit	10 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	5ms	1 (Unlimited)	Active
AT25320B-XHL-B	Microchip Technology	32Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	5ms	3 (168 Hours)	Active
BR25S320FVT-WE2	Rohm Semiconductor	32Kbit	20 MHz	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	5ms	1 (Unlimited)	Active
CAT25320YI-GT3	onsemi	32Kbit	10 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	5ms	1 (Unlimited)	Active
M95320-DFDW6TP	STMicroelectronics	32Kbit	20 MHz	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	5ms	1 (Unlimited)	Active
M95320-DRDW3TP/K	STMicroelectronics	32Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	4ms	1 (Unlimited)	Active
M95320-RDW6TP	STMicroelectronics	32Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	5ms	1 (Unlimited)	Active
R1EX25032ATA00I#S0	Renesas Electronics Corporation	32Kbit	5 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	5ms	1 (Unlimited)	Active

Engineering Selection Recommendations

All listed substitute parts maintain active product status and ROHS3 compliance, confirming ongoing manufacturing support and environmental regulatory adherence. Selection among substitutes should prioritize the following factors:

Direct Equivalents (10 MHz Operation): The 25AA320A-I/ST and CAT25320YI-GT3 provide identical electrical and performance characteristics to the main part. These are preferred when clock frequency specifications are fixed at 10 MHz or lower in the circuit design.

Enhanced Performance Substitutes (20 MHz Operation): The AT25320B-XHL-B, BR25S320FVT-WE2, M95320-DFDW6TP, M95320-DRDW3TP/K, and M95320-RDW6TP operate at 20 MHz, providing doubled clock frequency capability while maintaining full backward compatibility. These are suitable for designs that can benefit from faster SPI communication without circuit modification.

Automotive-Grade Option: The M95320-DRDW3TP/K carries AEC-Q100 qualification and extends operating temperature to -40°C to 125°C, making it appropriate for automotive and extended-temperature applications while maintaining the same 32Kbit capacity and SPI interface.

Lower Clock Frequency Option: The R1EX25032ATA00I#S0 operates at 5 MHz, suitable for applications with reduced speed requirements or lower power consumption priorities.

Voltage Supply Consideration: The BR25S320FVT-WE2 and M95320-DFDW6TP specify a minimum supply voltage of 1.7V, compared to 1.8V for the main part. This represents a minor relaxation of the lower voltage boundary and does not restrict substitution in standard applications.

Frequently Asked Questions (FAQ)

Q: Can I use a 20 MHz substitute part in a circuit designed for the 25AA320AX-I/ST?

A: Yes. The 20 MHz parts (AT25320B-XHL-B, BR25S320FVT-WE2, M95320-DFDW6TP, M95320-DRDW3TP/K, M95320-RDW6TP) are fully compatible. Higher clock frequency capability does not prevent operation at lower speeds. The circuit will function correctly at the original 10 MHz specification.

Q: Are all substitute parts pin-compatible with the 25AA320AX-I/ST?

A: Yes. All substitutes use the 8-TSSOP package with identical 0.173" width (4.40mm). Pin configuration for SPI EEPROM devices in this package is standardized, ensuring direct PCB footprint compatibility.

Q: What is the significance of the MSL (Moisture Sensitivity Level) rating difference?

A: MSL ratings indicate moisture exposure limits during storage and handling. MSL 1 (Unlimited) parts like the main 25AA320AX-I/ST have no moisture exposure restrictions. The AT25320B-XHL-B carries MSL 3 (168 Hours), requiring controlled storage conditions. Selection depends on your supply chain and storage capabilities.

Q: Can I substitute the R1EX25032ATA00I#S0 (5 MHz) for the main part?

A: Yes, if your circuit design does not require the full 10 MHz clock frequency. The 5 MHz part is fully compatible electrically and mechanically. Verify that your application's timing requirements are met at the lower clock speed.

Q: Is the M95320-DRDW3TP/K suitable for automotive applications?

A: Yes. This part carries AEC-Q100 qualification and operates across -40°C to 125°C, meeting automotive-grade requirements. It is the appropriate choice for automotive and extended-temperature industrial applications.

Q: What is the difference between the various STMicroelectronics M95320 part numbers?

A: The M95320-DFDW6TP, M95320-DRDW3TP/K, and M95320-RDW6TP all provide 32Kbit SPI EEPROM functionality at 20 MHz. The DRDW3TP/K variant includes automotive qualification and extended temperature range. Packaging differs (Tape & Reel versus Cut Tape & Digi-Reel), affecting procurement and handling. All three are electrically equivalent for circuit design purposes.

Q: Do all substitutes meet the 1.8V to 5.5V supply voltage range of the main part?

A: Most substitutes meet or exceed this range. The BR25S320FVT-WE2 and M95320-DFDW6TP specify 1.7V minimum, which is slightly lower. The M95320-DRDW3TP/K specifies 1.8V minimum, matching the main part exactly. All support the 5.5V maximum. Verify your circuit's actual supply voltage to confirm compatibility.

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