25LC320X-I/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 25LC320X-I/ST is a 32Kbit Serial Peripheral Interface (SPI) EEPROM memory IC manufactured by Microchip Technology, housed in an 8-TSSOP surface mount package. This non-volatile memory device operates at 2 MHz clock frequency with a supply voltage range of 2.5V to 5.5V and is rated for -40°C to 85°C operating temperature. The part is ROHS3 compliant and currently in active production status with 947 units in stock.

Substitute parts are necessary when the primary part becomes unavailable, when higher performance specifications are required, or when design requirements demand extended temperature ranges or automotive-grade qualifications. Alternative manufacturers and higher clock frequency variants provide flexibility in component sourcing while maintaining functional compatibility.

Key Parameters

Parameter	Specification
Memory Size	32Kbit
Memory Organization	4K x 8
Memory Interface	SPI
Clock Frequency	2 MHz
Write Cycle Time	5ms
Voltage Supply Range	2.5V ~ 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 25LC320X-I/ST is determined by the following critical parameters:

Core Compatibility Requirements:

Memory Size: 32Kbit (mandatory match)
Memory Organization: 4K x 8 (mandatory match)
Memory Interface: SPI (mandatory match)
Package Type: 8-TSSOP (mandatory match)
Mounting Type: Surface Mount (mandatory match)

Performance Flexibility Parameters:

Clock Frequency: 2 MHz minimum (higher frequencies are backward compatible)
Write Cycle Time: 5ms maximum (faster write times are acceptable)
Voltage Supply Range: Must encompass or exceed 2.5V ~ 5.5V
Operating Temperature: Must support minimum -40°C ~ 85°C range

Compliance Parameters:

RoHS Status: ROHS3 Compliant (required)
Moisture Sensitivity Level: 1 or 3 acceptable for standard applications

Substitute parts are grouped by manufacturer and performance tier. Microchip Technology variants (25AA320A-I/ST, 25AA320AX-I/ST, 25LC320A-I/ST) provide direct functional equivalence with enhanced clock frequencies. Cross-manufacturer alternatives (AT25320B-XHL-B, BR25S320FVT-WE2, CAT25320YI-GT3, CAV25320YE-GT3, M95320 series) maintain identical memory specifications while offering different voltage ranges, temperature ratings, and automotive qualifications.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Voltage Supply	Operating Temp	Write Cycle Time	Package	Automotive Grade	Inventory
25LC320X-I/ST	Microchip Technology	32Kbit	2 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	No	947
25AA320A-I/ST	Microchip Technology	32Kbit	10 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	No	2200
25AA320AX-I/ST	Microchip Technology	32Kbit	10 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	No	817
25LC320A-I/ST	Microchip Technology	32Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	No	4192
AT25320B-XHL-B	Microchip Technology	32Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	No	1737
BR25S320FVT-WE2	Rohm Semiconductor	32Kbit	20 MHz	1.7V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP-B	No	6704
CAT25320YI-GT3	onsemi	32Kbit	10 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	No	2050
CAV25320YE-GT3	onsemi	32Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	5ms	8-TSSOP	Yes (AEC-Q100)	1430
M95320-DFDW6TP	STMicroelectronics	32Kbit	20 MHz	1.7V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	No	5008
M95320-DRDW3TP/K	STMicroelectronics	32Kbit	20 MHz	1.8V ~ 5.5V	-40°C ~ 125°C	4ms	8-TSSOP	Yes (AEC-Q100)	16248
M95320-DWDW4TP/K	STMicroelectronics	32Kbit	10 MHz	2.5V ~ 5.5V	-40°C ~ 145°C	4ms	8-TSSOP	Yes (AEC-Q100)	4758

Engineering Selection Recommendations

Direct Functional Equivalents (Microchip Technology): The 25LC320A-I/ST provides the closest match to the 25LC320X-I/ST, maintaining identical voltage supply range (2.5V ~ 5.5V) and temperature rating (-40°C ~ 85°C) while offering 5x higher clock frequency (10 MHz). This part is ROHS3 compliant with 4192 units in stock, making it the preferred substitute for standard industrial applications requiring voltage compatibility with the original specification.

Enhanced Performance Variants: The 25AA320A-I/ST and 25AA320AX-I/ST offer 10 MHz operation with extended lower voltage support (1.8V minimum), suitable for low-power applications. Both maintain ROHS3 compliance and -40°C ~ 85°C operating range. The 25AA320A-I/ST has higher inventory availability (2200 units).

High-Speed Alternatives: AT25320B-XHL-B, BR25S320FVT-WE2, and M95320-DFDW6TP provide 20 MHz clock frequency with ROHS3 compliance. BR25S320FVT-WE2 (Rohm Semiconductor) offers the lowest supply voltage floor (1.7V) and highest inventory (6704 units). M95320-DFDW6TP (STMicroelectronics) provides equivalent performance with 5008 units available.

Automotive-Grade Options: CAV25320YE-GT3 (onsemi) and M95320-DRDW3TP/K (STMicroelectronics) are AEC-Q100 qualified for automotive applications. CAV25320YE-GT3 maintains the original 2.5V ~ 5.5V voltage range with extended temperature to 125°C. M95320-DRDW3TP/K offers 20 MHz operation, 1.8V ~ 5.5V supply range, and -40°C ~ 125°C temperature rating with 16248 units in stock. M95320-DWDW4TP/K extends temperature capability to 145°C with 2.5V ~ 5.5V supply and 10 MHz operation.

Selection Criteria:

For voltage compatibility with 2.5V systems: 25LC320A-I/ST, CAV25320YE-GT3, M95320-DWDW4TP/K
For extended low-voltage operation (1.8V): 25AA320A-I/ST, 25AA320AX-I/ST, AT25320B-XHL-B, CAT25320YI-GT3, M95320-DRDW3TP/K
For automotive applications: CAV25320YE-GT3, M95320-DRDW3TP/K, M95320-DWDW4TP/K
For maximum inventory availability: M95320-DRDW3TP/K (16248 units), BR25S320FVT-WE2 (6704 units)

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher clock frequency than the original 25LC320X-I/ST?

A: Yes. Higher clock frequency variants (10 MHz or 20 MHz) are backward compatible with 2 MHz applications. The SPI interface operates at the speed commanded by the host controller, so a 10 MHz or 20 MHz part will function correctly in a 2 MHz system. This provides performance headroom for future design iterations.

Q: What is the difference between 25AA320A-I/ST and 25LC320A-I/ST?

A: Both are Microchip Technology 32Kbit SPI EEPROM devices with identical memory organization, clock frequency (10 MHz), and package (8-TSSOP). The primary difference is voltage supply range: 25AA320A-I/ST operates from 1.8V ~ 5.5V, while 25LC320A-I/ST operates from 2.5V ~ 5.5V. Select 25LC320A-I/ST if your system requires 2.5V minimum supply compatibility.

Q: Are automotive-grade parts (AEC-Q100) compatible with standard industrial designs?

A: Yes. Automotive-grade parts meet or exceed industrial specifications and are fully compatible with standard applications. CAV25320YE-GT3 and M95320-DRDW3TP/K are AEC-Q100 qualified and provide enhanced reliability margins. They can be used as direct substitutes in non-automotive designs without modification.

Q: What is the significance of the 8-TSSOP-B package designation for BR25S320FVT-WE2?

A: The 8-TSSOP-B is a variant of the standard 8-TSSOP package with identical pin pitch, spacing, and electrical compatibility. The "B" designation indicates a minor physical variation that does not affect PCB layout or electrical performance. BR25S320FVT-WE2 is mechanically and electrically compatible with standard 8-TSSOP footprints.

Q: Which substitute offers the fastest write cycle time?

A: M95320-DRDW3TP/K and M95320-DWDW4TP/K both feature 4ms write cycle time, compared to 5ms for the original 25LC320X-I/ST and most substitutes. This 20% improvement in write performance is beneficial for applications requiring rapid data logging or frequent memory updates.

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

A: No. The substitute part's voltage supply range must encompass or exceed the original specification. The 25LC320X-I/ST requires 2.5V ~ 5.5V operation. Parts with 1.8V minimum (25AA320A-I/ST, AT25320B-XHL-B, CAT25320YI-GT3, M95320-DRDW3TP/K) are acceptable because they support the full 2.5V ~ 5.5V range. Parts with 1.7V minimum (BR25S320FVT-WE2, M95320-DFDW6TP) are also acceptable.

Q: What is the difference between Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel packaging?

A: Both are surface mount packaging formats suitable for automated assembly. Tape & Reel (TR) is standard for high-volume production. Cut Tape (CT) & Digi-Reel is a flexible format allowing smaller quantity orders while maintaining reel compatibility. Electrical and functional specifications are identical; packaging choice depends on procurement volume and assembly equipment compatibility.

Q: Is the 25LC320X-I/ST still in production?

A: Yes, the 25LC320X-I/ST is listed as Active product status with 947 units in current stock. However, substitute parts with higher clock frequencies and extended temperature ranges offer superior availability and performance characteristics for new designs.

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