25AA320XT-I/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 25AA320XT-I/ST is a 32Kbit Serial Peripheral Interface (SPI) EEPROM memory IC manufactured by Microchip Technology in 8-TSSOP surface mount packaging. This non-volatile memory device operates at 1 MHz clock frequency with a supply voltage range of 1.8V to 5.5V and supports industrial temperature range operation from -40°C to 85°C. The part is ROHS3 compliant and carries Active product 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	1 MHz
Package / Case	8-TSSOP (0.173", 4.40mm Width)
Voltage - Supply	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Write Cycle Time	5ms
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 25AA320XT-I/ST are qualified based on the following critical parameters:

Memory capacity of 32Kbit with 4K x 8 organization
SPI serial interface protocol
8-TSSOP surface mount package with 0.173" width and 4.40mm dimensions
Supply voltage range compatibility (minimum 1.8V support required)
Operating temperature range of -40°C to 85°C
Write cycle time of 5ms or less
ROHS3 compliance and Active product status

Clock frequency variations above 1 MHz are acceptable as higher-speed devices remain backward compatible in applications requiring lower clock rates. Packaging format variations (Tape & Reel versus Cut Tape) do not affect electrical or mechanical interchangeability. Substitutes from different manufacturers (Microchip Technology, STMicroelectronics, Rohm Semiconductor, onsemi, Renesas Electronics) are included when all core electrical and mechanical parameters align.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Memory Size	Clock Frequency	Voltage - Supply	Operating Temperature	Write Cycle Time	Package / Case	Product Status
25AA320XT-I/ST	Microchip Technology	32Kbit	1 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Active
25AA320AT-I/ST	Microchip Technology	32Kbit	10 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Active
AT25320B-XHL-T	Microchip Technology	32Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Active
BR25S320FVT-WE2	Rohm Semiconductor	32Kbit	20 MHz	1.7V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Active
CAT25320YI-GT3	onsemi	32Kbit	10 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Active
M95320-DFDW6TP	STMicroelectronics	32Kbit	20 MHz	1.7V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Active
M95320-DRDW3TP/K	STMicroelectronics	32Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 125°C	4ms	8-TSSOP	Active
M95320-DWDW4TP/K	STMicroelectronics	32Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 145°C	4ms	8-TSSOP	Active
M95320-RDW6TP	STMicroelectronics	32Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Active
R1EX25032ATA00I#S0	Renesas Electronics Corporation	32Kbit	5 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Active

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, ensuring long-term availability and regulatory conformance. Selection among substitutes should prioritize the following criteria based on application requirements:

Standard Industrial Applications: The 25AA320AT-I/ST, AT25320B-XHL-T, M95320-RDW6TP, and R1EX25032ATA00I#S0 are suitable for general-purpose applications requiring standard industrial temperature range (-40°C to 85°C) and supply voltage compatibility with 1.8V minimum operation.

Automotive-Grade Requirements: The M95320-DRDW3TP/K and M95320-DWDW4TP/K carry AEC-Q100 automotive qualification and extended temperature range support (-40°C to 125°C and -40°C to 145°C respectively), making them appropriate for automotive and harsh environment applications.

Supply Voltage Constraints: Applications with minimum supply voltage below 1.8V should avoid M95320-DWDW4TP/K, which requires 2.5V minimum. The BR25S320FVT-WE2 supports 1.7V minimum operation, providing additional margin for low-voltage designs.

Clock Frequency Considerations: Higher clock frequency variants (10 MHz, 20 MHz) are backward compatible with 1 MHz system designs and offer performance headroom. The R1EX25032ATA00I#S0 at 5 MHz provides intermediate speed capability.

Frequently Asked Questions (FAQ)

Q: Can I use a 20 MHz clock frequency part as a direct replacement for the 1 MHz 25AA320XT-I/ST?

A: Yes. Higher clock frequency EEPROM devices operate at lower frequencies without functional degradation. The AT25320B-XHL-T, BR25S320FVT-WE2, M95320-DFDW6TP, M95320-DRDW3TP/K, and M95320-RDW6TP all support 20 MHz operation and are electrically compatible with 1 MHz system designs.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel and Cut Tape are packaging formats for surface mount components. Both formats contain identical die and lead frames. Tape & Reel is supplied on continuous carrier tape suitable for automated assembly lines, while Cut Tape is supplied in smaller quantities on individual tape segments. Electrical and mechanical specifications remain identical between formats.

Q: Are STMicroelectronics M95320 parts compatible with Microchip 25AA320 pinouts?

A: Yes. All listed substitute parts share the 8-TSSOP package with identical pin assignments and SPI interface protocol. Pin-for-pin compatibility is maintained across all manufacturers listed.

Q: Which substitute part supports the widest temperature range?

A: The M95320-DWDW4TP/K supports -40°C to 145°C operating temperature, the widest range among all listed substitutes. This part also carries AEC-Q100 automotive qualification.

Q: Can I substitute a part with lower supply voltage minimum (1.7V) for a design requiring 1.8V minimum?

A: Yes. Parts with lower minimum supply voltage (such as BR25S320FVT-WE2 at 1.7V minimum) are compatible with designs specifying 1.8V minimum operation, as they exceed the minimum requirement.

Q: What is the significance of the write cycle time difference between 4ms and 5ms?

A: Write cycle time represents the duration required to complete a single page write operation. Parts with 4ms write cycle time (M95320-DRDW3TP/K and M95320-DWDW4TP/K) complete write operations faster than 5ms variants. Both are compatible in applications designed for 5ms cycle time, with faster parts providing performance improvement.

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