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

Part Overview

The 25LC320AT-E/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 at 10 MHz clock frequency with a 2.5V to 5.5V supply voltage range and supports industrial temperature operation from -40°C to 125°C. The part is ROHS3 compliant and currently in active production status with 2488 units in stock.

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative manufacturers offer improved specifications, or when design requirements necessitate enhanced performance characteristics such as higher clock frequency, extended temperature ranges, or automotive-grade qualification.

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	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
Package Type	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution compatibility for the 25LC320AT-E/ST is determined by the following critical parameters:

Mandatory Compatibility Parameters:

Memory Size: 32Kbit (all substitutes must match)
Memory Organization: 4K x 8 (all substitutes must match)
Memory Interface: SPI (all substitutes must match)
Package Type: 8-TSSOP form factor (all substitutes must match)
Mounting Type: Surface Mount (all substitutes must match)

Performance Enhancement Parameters (allow substitution with equal or superior specifications):

Clock Frequency: 10 MHz minimum (20 MHz variants are direct upgrades)
Write Cycle Time: 5ms maximum (4ms variants are acceptable)
Voltage Supply Range: 2.5V ~ 5.5V minimum (wider ranges are acceptable)
Operating Temperature: -40°C ~ 125°C minimum (extended ranges are acceptable)

Compliance Parameters:

RoHS Status: ROHS3 Compliant (all substitutes must maintain compliance)

All identified substitute parts maintain the core memory specifications while offering equal or enhanced electrical and thermal performance characteristics.

Parameter Comparison

Part Number	Manufacturer	Clock Frequency	Voltage Supply	Operating Temperature	Write Cycle Time	Package	Grade	Qualification
25LC320AT-E/ST	Microchip Technology	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	5ms	8-TSSOP	Industrial	None
AT25320B-XHL-B	Microchip Technology	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Industrial	None
AT25320B-XHL-T	Microchip Technology	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Industrial	None
BR25H320FVT-2CE2	Rohm Semiconductor	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	4ms	8-TSSOP-B	Automotive	AEC-Q100
BR25S320FVT-WE2	Rohm Semiconductor	20 MHz	1.7V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP-B	Industrial	None
CAT25320YI-GT3	onsemi	10 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Industrial	None
CAV25320YE-GT3	onsemi	10 MHz	2.5V ~ 5.5V	-40°C ~ 125°C	5ms	8-TSSOP	Automotive	AEC-Q100
M95320-DFDW6TP	STMicroelectronics	20 MHz	1.7V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Industrial	None
M95320-DRDW3TP/K	STMicroelectronics	20 MHz	1.8V ~ 5.5V	-40°C ~ 125°C	4ms	8-TSSOP	Automotive	AEC-Q100
M95320-DWDW4TP/K	STMicroelectronics	10 MHz	2.5V ~ 5.5V	-40°C ~ 145°C	4ms	8-TSSOP	Automotive	AEC-Q100
M95320-RDW6TP	STMicroelectronics	20 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	5ms	8-TSSOP	Industrial	None

Engineering Selection Recommendations

Direct Industrial Substitutes (Equivalent Performance): The CAT25320YI-GT3 from onsemi provides identical electrical specifications and operating temperature range as the 25LC320AT-E/ST with ROHS3 compliance and active production status. This part is suitable for direct replacement in industrial applications requiring no performance enhancement.

Enhanced Performance Substitutes (Higher Clock Frequency): The AT25320B-XHL-T, M95320-DFDW6TP, M95320-DRDW3TP/K, and M95320-RDW6TP offer 20 MHz clock frequency operation, doubling the data transfer rate while maintaining SPI interface compatibility and ROHS3 compliance. These parts are suitable when higher throughput is required, though operating temperature range is reduced to -40°C to 85°C for industrial variants.

Extended Temperature Substitutes (Automotive Grade): The M95320-DWDW4TP/K from STMicroelectronics extends operating temperature to -40°C to 145°C with AEC-Q100 automotive qualification, maintaining 10 MHz clock frequency and 2.5V to 5.5V supply voltage compatibility. This part is specified for applications requiring extended thermal performance and automotive-grade reliability.

Dual Enhancement Substitutes (Higher Frequency + Extended Temperature): The M95320-DRDW3TP/K combines 20 MHz clock frequency with -40°C to 125°C operating temperature range and AEC-Q100 automotive qualification, offering both performance and thermal envelope expansion.

All substitute parts maintain ROHS3 compliance and active production status, ensuring long-term availability and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can I use a 20 MHz substitute part in place of the 10 MHz 25LC320AT-E/ST?

A: Yes. The 20 MHz variants (AT25320B-XHL-T, M95320-DFDW6TP, M95320-DRDW3TP/K, M95320-RDW6TP) are electrically compatible and provide enhanced performance. The SPI interface remains identical, and the higher clock frequency is backward compatible with systems designed for 10 MHz operation. However, verify that the operating temperature range meets your application requirements, as some 20 MHz variants are limited to -40°C to 85°C.

Q: What is the difference between 8-TSSOP and 8-TSSOP-B packages?

A: Both package types are 8-pin TSSOP form factors with identical 0.173" width and 4.40mm dimensions, suitable for the same PCB footprints. The "-B" designation indicates a variant from Rohm Semiconductor with equivalent mechanical and electrical compatibility. No design changes are required for package substitution.

Q: Are automotive-grade parts (AEC-Q100) suitable for industrial applications?

A: Yes. Automotive-grade parts with AEC-Q100 qualification exceed industrial reliability requirements and are fully compatible with industrial applications. These parts offer enhanced thermal performance and extended operating temperature ranges, making them suitable for demanding industrial environments.

Q: What is the impact of different voltage supply ranges on substitution?

A: The 25LC320AT-E/ST operates from 2.5V to 5.5V. Substitute parts with wider ranges (such as 1.7V to 5.5V or 1.8V to 5.5V) are fully compatible and provide additional flexibility for low-voltage applications. Substitutes with narrower ranges are not recommended. Verify your system supply voltage falls within the substitute part's specified range.

Q: Can I substitute parts with different write cycle times?

A: Yes. The 25LC320AT-E/ST specifies 5ms write cycle time. Substitute parts with 4ms write cycle time (BR25H320FVT-2CE2, M95320-DRDW3TP/K, M95320-DWDW4TP/K) are faster and fully compatible. Faster write cycles do not create compatibility issues; they only improve performance.

Q: Which substitute offers the best overall performance?

A: The M95320-DRDW3TP/K combines 20 MHz clock frequency, 4ms write cycle time, -40°C to 125°C operating temperature, and AEC-Q100 automotive qualification. This part provides maximum performance enhancement while maintaining extended thermal operation and automotive-grade reliability.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All identified substitute parts maintain ROHS3 compliance, ensuring compatibility with environmental regulations and supply chain requirements equivalent to the primary part.

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