25LC320AT-I/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 25LC320AT-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 10 MHz clock frequency with a 2.5V to 5.5V supply voltage range and -40°C to 85°C operating temperature. The part is Active status and ROHS3 compliant. 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
Voltage Supply Range	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Write Cycle Time	5ms
Package / Case	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 25LC320AT-I/ST are grouped based on the following critical parameters that determine functional interchangeability:

Primary Substitution Criteria:

Memory capacity: 32Kbit (4K x 8 organization)
Interface protocol: SPI
Package type: 8-TSSOP surface mount
Physical dimensions: 0.173" width, 4.40mm
Supply voltage compatibility: Minimum 2.5V support
Operating temperature range: Minimum -40°C to 85°C coverage

Substitution Groups:

Group 1 - Direct Microchip Technology Equivalents (Same Base Series) Parts 25LC320A-I/ST and 25AA320AT-I/ST share identical memory specifications with the main part but differ in packaging format and voltage supply range. The 25AA320AT-I/ST extends supply voltage to 1.8V minimum, providing broader compatibility.

Group 2 - Higher Performance Microchip Technology Parts (20 MHz Clock) Parts AT25320B-XHL-B and AT25320B-XHL-T operate at 20 MHz clock frequency (double the main part) with extended supply voltage range (1.8V minimum) and identical memory capacity. These parts are pin-compatible and functionally superior for timing-critical applications.

Group 3 - Rohm Semiconductor Equivalents Parts BR25H320FVT-2CE2 and BR25S320FVT-WE2 provide 32Kbit SPI EEPROM functionality in 8-TSSOP-B packaging. BR25H320FVT-2CE2 operates at 10 MHz with automotive qualification (AEC-Q100), while BR25S320FVT-WE2 operates at 20 MHz with extended temperature range to -40°C to 85°C.

Group 4 - onsemi Equivalents Parts CAT25320YI-GT3 and CAV25320YE-GT3 provide 32Kbit SPI EEPROM in standard 8-TSSOP packaging. CAV25320YE-GT3 includes automotive qualification (AEC-Q100) and extended operating temperature to -40°C to 125°C.

Group 5 - STMicroelectronics Equivalents Parts M95320-DFDW6TP and M95320-DRDW3TP/K provide 32Kbit SPI EEPROM at 20 MHz clock frequency. M95320-DRDW3TP/K includes automotive qualification (AEC-Q100) and extended operating temperature to -40°C to 125°C.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Voltage Supply	Operating Temp	Write Cycle Time	Package	Automotive Grade
25LC320AT-I/ST	Microchip Technology	32Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	No
25LC320A-I/ST	Microchip Technology	32Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	No
25AA320AT-I/ST	Microchip Technology	32Kbit	10 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	No
AT25320B-XHL-B	Microchip Technology	32Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	No
AT25320B-XHL-T	Microchip Technology	32Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	No
BR25H320FVT-2CE2	Rohm Semiconductor	32Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	4ms	8-TSSOP-B	Yes (AEC-Q100)
BR25S320FVT-WE2	Rohm Semiconductor	32Kbit	20 MHz	1.7V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP-B	No
CAT25320YI-GT3	onsemi	32Kbit	10 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	No
CAV25320YE-GT3	onsemi	32Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	5ms	8-TSSOP	Yes (AEC-Q100)
M95320-DFDW6TP	STMicroelectronics	32Kbit	20 MHz	1.7V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	No
M95320-DRDW3TP/K	STMicroelectronics	32Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 125°C	4ms	8-TSSOP	Yes (AEC-Q100)

Engineering Selection Recommendations

For Direct Replacement (Same Performance Profile): The 25LC320A-I/ST provides identical electrical and timing specifications to the 25LC320AT-I/ST with the only difference being packaging format (Tube vs. Tape & Reel). This part is suitable for direct substitution when packaging format is not a constraint.

For Extended Supply Voltage Range: The 25AA320AT-I/ST, CAT25320YI-GT3, and BR25S320FVT-WE2 extend the minimum supply voltage to 1.8V or 1.7V, enabling operation in low-power applications. These parts maintain 10 MHz or higher clock frequency and are pin-compatible with the main part.

For Higher Clock Frequency Applications: The AT25320B-XHL-B, AT25320B-XHL-T, BR25S320FVT-WE2, M95320-DFDW6TP, and M95320-DRDW3TP/K operate at 20 MHz clock frequency, doubling the data transfer rate. These parts are suitable for timing-critical applications requiring faster SPI communication.

For Automotive and Extended Temperature Applications: The BR25H320FVT-2CE2, CAV25320YE-GT3, and M95320-DRDW3TP/K carry AEC-Q100 automotive qualification and support extended operating temperature to -40°C to 125°C. These parts are required for automotive-grade applications and harsh environment deployments.

For Compliance and Availability: All substitute parts maintain ROHS3 compliance and REACH unaffected status. Selection should consider inventory availability, lead time, and cost factors alongside electrical compatibility.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 25LC320AT-I/ST with any 32Kbit SPI EEPROM? A: No. Substitutes must match the 8-TSSOP package type, SPI interface protocol, 4K x 8 memory organization, and support the 2.5V to 5.5V supply voltage range. Pin compatibility and timing characteristics must also align with the application requirements.

Q: What is the difference between 25LC320AT-I/ST and 25LC320A-I/ST? A: Both parts are Microchip Technology 32Kbit SPI EEPROMs with identical electrical specifications. The primary difference is packaging format: 25LC320AT-I/ST is supplied in Tape & Reel format, while 25LC320A-I/ST is supplied in Tube format. Electrical performance is equivalent.

Q: Can I use a 20 MHz part as a substitute for a 10 MHz part? A: Yes. Parts operating at 20 MHz clock frequency (AT25320B-XHL-B, AT25320B-XHL-T, BR25S320FVT-WE2, M95320-DFDW6TP, M95320-DRDW3TP/K) are backward compatible with 10 MHz applications. The higher clock frequency provides superior performance without compromising compatibility.

Q: Are automotive-grade parts required for all applications? A: Automotive-grade parts (BR25H320FVT-2CE2, CAV25320YE-GT3, M95320-DRDW3TP/K) with AEC-Q100 qualification are required only for automotive and mission-critical applications. Standard industrial-grade parts are suitable for consumer and general industrial applications.

Q: What is the significance of the 8-TSSOP-B package designation? A: The 8-TSSOP-B package used by Rohm Semiconductor parts (BR25H320FVT-2CE2, BR25S320FVT-WE2) is a variant of the standard 8-TSSOP package. Both packages maintain identical pin pitch and physical dimensions (0.173" width, 4.40mm), ensuring mechanical and electrical compatibility on standard PCB layouts.

Q: Can I use parts with lower minimum supply voltage in higher voltage applications? A: Yes. Parts with 1.8V or 1.7V minimum supply voltage (25AA320AT-I/ST, AT25320B-XHL-B, AT25320B-XHL-T, CAT25320YI-GT3, BR25S320FVT-WE2, M95320-DFDW6TP, M95320-DRDW3TP/K) operate across the full 2.5V to 5.5V range and are suitable for applications using the main part's voltage specification.

Q: What is the impact of write cycle time differences? A: Write cycle time differences (4ms vs. 5ms) have minimal impact on most applications. Parts with 4ms write cycle time (BR25H320FVT-2CE2, M95320-DRDW3TP/K) provide marginally faster write operations. Application firmware must account for the specified write cycle time regardless of the selected part.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the environmental and regulatory compliance profile of the 25LC320AT-I/ST.

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