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

Part Overview

The 25LC320AT-I/MS is a 32Kbit Serial Peripheral Interface (SPI) EEPROM memory IC manufactured by Microchip Technology. This non-volatile memory device operates at 10 MHz clock frequency with a supply voltage range of 2.5V to 5.5V and is housed in an 8-MSOP surface mount package. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are identified based on matching core electrical and mechanical parameters: 32Kbit memory capacity, 4K x 8 memory organization, SPI interface, 8-pin surface mount packaging, and compatible operating temperature ranges. Substitutes may vary in clock frequency, supply voltage range, and package dimensions while maintaining functional compatibility.

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
Mounting Type	Surface Mount
Package Type	8-MSOP (0.118", 3.00mm Width)
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 25LC320AT-I/MS are grouped based on the following substitution criteria:

Primary Substitution Parameters:

Memory capacity: 32Kbit
Memory organization: 4K x 8
Interface protocol: SPI
Pin count and surface mount configuration: 8-pin
Operating temperature range: -40°C to 85°C minimum
RoHS3 compliance

Secondary Variation Parameters (allowed differences):

Clock frequency: 10 MHz to 20 MHz (higher frequency maintains backward compatibility)
Supply voltage range: 1.7V to 5.5V (wider range maintains compatibility)
Package dimensions: 8-MSOP or 8-TSSOP variants
Write cycle time: 4ms to 5ms
Packaging format: Tape & Reel, Cut Tape, or Tube

Parts are considered equivalent when they maintain the core memory specifications and SPI interface while potentially offering enhanced performance characteristics (higher clock speed) or broader operating conditions (extended voltage or temperature ranges).

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Voltage Supply	Operating Temp	Package Type	Write Cycle Time	MSL Rating
25LC320AT-I/MS	Microchip Technology	32Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	8-MSOP	5ms	1
25LC320A-I/MS	Microchip Technology	32Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	8-MSOP	5ms	1
25AA320AT-I/MS	Microchip Technology	32Kbit	10 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-MSOP	5ms	1
AT25320B-XHL-B	Microchip Technology	32Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	5ms	3
AT25320B-XHL-T	Microchip Technology	32Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	5ms	1
BR25H320FVM-2CTR	Rohm Semiconductor	32Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	8-MSOP	4ms	1
BR25S320FVM-WTR	Rohm Semiconductor	32Kbit	20 MHz	1.7V ~ 5.5V	-40°C ~ 85°C	8-MSOP	5ms	1
CAT25320YI-GT3	onsemi	32Kbit	10 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	5ms	1
CAV25320YE-GT3	onsemi	32Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	5ms	1
M95320-DFDW6TP	STMicroelectronics	32Kbit	20 MHz	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	5ms	1
M95320-DRDW3TP/K	STMicroelectronics	32Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	4ms	1

Engineering Selection Recommendations

Direct Electrical Equivalents (Same Clock Frequency - 10 MHz):

25LC320A-I/MS and 25LC320AT-I/MS are functionally equivalent Microchip Technology parts with identical electrical specifications. The primary difference is packaging format (Tube versus Tape & Reel). Both maintain the 2.5V to 5.5V supply range and 10 MHz operation.

25AA320AT-I/MS offers extended lower voltage operation (1.8V minimum) while maintaining 10 MHz clock frequency and 8-MSOP packaging. This part is suitable for applications requiring lower supply voltage compatibility.

BR25H320FVM-2CTR (Rohm Semiconductor) provides 10 MHz operation in 8-MSOP packaging with extended upper operating temperature to 125°C and AEC-Q100 automotive qualification. This part is appropriate for automotive-grade applications.

CAT25320YI-GT3 (onsemi) operates at 10 MHz in 8-TSSOP packaging with 1.8V to 5.5V supply range. This represents a package variant substitution.

CAV25320YE-GT3 (onsemi) provides 10 MHz operation with extended temperature range to 125°C and AEC-Q100 automotive qualification in 8-TSSOP packaging.

Enhanced Performance Substitutes (20 MHz Clock Frequency):

AT25320B-XHL-T and AT25320B-XHL-B (Microchip Technology) operate at 20 MHz in 8-TSSOP packaging with 1.8V to 5.5V supply range. These parts offer doubled clock frequency while maintaining backward compatibility. MSL rating differs (1 versus 3).

BR25S320FVM-WTR (Rohm Semiconductor) provides 20 MHz operation in 8-MSOP packaging with 1.7V to 5.5V supply range.

M95320-DFDW6TP (STMicroelectronics) operates at 20 MHz in 8-TSSOP packaging with 1.7V to 5.5V supply range.

M95320-DRDW3TP/K (STMicroelectronics) provides 20 MHz operation with extended temperature range to 125°C and AEC-Q100 automotive qualification in 8-TSSOP packaging.

Selection Criteria:

For direct replacement in existing designs: 25LC320A-I/MS or 25AA320AT-I/MS
For automotive applications: BR25H320FVM-2CTR, CAV25320YE-GT3, or M95320-DRDW3TP/K
For enhanced performance: AT25320B-XHL-T, BR25S320FVM-WTR, M95320-DFDW6TP, or M95320-DRDW3TP/K
For extended voltage range: 25AA320AT-I/MS, AT25320B-XHL-T, BR25S320FVM-WTR, CAT25320YI-GT3, or M95320-DFDW6TP

Frequently Asked Questions (FAQ)

Q: Can I use a 20 MHz part as a substitute for the 10 MHz 25LC320AT-I/MS?

A: Yes. Parts operating at 20 MHz are backward compatible with 10 MHz applications. The higher clock frequency does not prevent operation in circuits designed for 10 MHz. The SPI interface and memory organization remain identical.

Q: What is the difference between 8-MSOP and 8-TSSOP packaging?

A: Both are 8-pin surface mount packages with different physical dimensions. 8-MSOP measures 0.118" (3.00mm) width, while 8-TSSOP measures 0.173" (4.40mm) width. These are not interchangeable on the same PCB without layout modification. Verify your PCB footprint before substitution.

Q: Can I substitute a part with a lower minimum supply voltage?

A: Yes. Parts with lower minimum supply voltage (such as 1.8V minimum instead of 2.5V minimum) are compatible in applications using the original part's voltage range. The lower minimum rating provides additional flexibility for low-power applications.

Q: Are automotive-qualified parts (AEC-Q100) required for non-automotive applications?

A: No. Automotive-qualified parts meet additional reliability and testing standards but function identically to non-automotive equivalents in standard applications. Selection depends on application requirements, not necessity.

Q: What does MSL rating indicate for substitution purposes?

A: Moisture Sensitivity Level (MSL) indicates the maximum time a component can be exposed to moisture before soldering. MSL 1 (Unlimited) allows indefinite storage without moisture control. MSL 3 (168 Hours) requires moisture control during storage. Higher MSL numbers require more stringent handling procedures.

Q: Can I use 25AA320AT-I/MS in place of 25LC320AT-I/MS?

A: Yes. Both are Microchip Technology 32Kbit SPI EEPROM devices with identical memory organization and interface. The 25AA320AT-I/MS offers extended lower voltage operation (1.8V minimum) and is fully compatible.

Q: What is the significance of the write cycle time difference (4ms versus 5ms)?

A: Write cycle time indicates the duration required to complete a single write operation. Parts with 4ms write cycle time complete write operations faster than 5ms parts. This does not affect compatibility; faster write times represent improved performance.

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