AT25320N-10SC EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The AT25320N-10SC is a 32Kbit Serial Peripheral Interface (SPI) EEPROM memory integrated circuit manufactured by Microchip Technology. This non-volatile memory device operates at 3 MHz clock frequency and is housed in an 8-SOIC surface mount package. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement requirements. Substitute parts must maintain compatibility with the core electrical specifications and physical packaging while potentially offering enhanced performance characteristics or improved availability.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile EEPROM
Memory Size	32Kbit
Memory Organization	4K x 8
Memory Interface	SPI
Clock Frequency	3 MHz
Write Cycle Time	5ms
Supply Voltage Range	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the AT25320N-10SC is determined by strict adherence to the following core parameters:

Critical Compatibility Parameters:

Memory Size: 32Kbit (non-negotiable)
Memory Organization: 4K x 8 (non-negotiable)
Memory Interface: SPI (non-negotiable)
Package / Case: 8-SOIC with 0.154" (3.90mm) width (non-negotiable)
Mounting Type: Surface Mount (non-negotiable)
Write Cycle Time: 5ms (non-negotiable)

Performance Enhancement Parameters (Acceptable for Substitution):

Clock Frequency: Substitute parts may operate at equal or higher frequencies (3 MHz or greater)
Supply Voltage Range: Substitute parts must support the original 4.5V ~ 5.5V range; wider ranges are acceptable
Operating Temperature: Substitute parts may support equal or wider temperature ranges

All identified substitute parts maintain the mandatory core parameters while offering equal or superior performance characteristics. The substitutes are presented in order of manufacturer recommendation.

Parameter Comparison

Parameter	AT25320N-10SC (Main Part)	CAV25320VE-GT3	M95320-WMN6P	M95320-WMN6TP
Manufacturer	Microchip Technology	onsemi	STMicroelectronics	STMicroelectronics
Memory Size	32Kbit	32Kbit	32Kbit	32Kbit
Memory Organization	4K x 8	4K x 8	4K x 8	4K x 8
Memory Interface	SPI	SPI	SPI	SPI
Clock Frequency	3 MHz	10 MHz	20 MHz	20 MHz
Write Cycle Time	5ms	5ms	5ms	5ms
Supply Voltage Range	4.5V ~ 5.5V	2.5V ~ 5.5V	2.5V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)	8-SOIC (0.154", 3.90mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

CAV25320VE-GT3 (onsemi)

The CAV25320VE-GT3 is an active product with ROHS3 compliance and AEC-Q100 automotive qualification. This part operates at 10 MHz clock frequency, exceeding the original 3 MHz specification, and supports an extended operating temperature range of -40°C to 125°C. The supply voltage range extends to 2.5V minimum, providing broader compatibility than the original 4.5V minimum. This substitute is suitable for applications requiring automotive-grade reliability and extended temperature operation.

M95320-WMN6P (STMicroelectronics)

The M95320-WMN6P is an active product with ROHS3 compliance and verified programmability status. This part operates at 20 MHz clock frequency and supports supply voltages from 2.5V to 5.5V. The operating temperature range is -40°C to 85°C. Packaging is provided in tube format. This substitute offers the highest clock frequency performance among available options.

M95320-WMN6TP (STMicroelectronics)

The M95320-WMN6TP is an active product with ROHS3 compliance and verified programmability status. This part is electrically identical to the M95320-WMN6P, operating at 20 MHz clock frequency with supply voltage range of 2.5V to 5.5V and operating temperature range of -40°C to 85°C. Packaging is provided in Cut Tape and Digi-Reel format. This substitute offers the highest clock frequency performance and largest available inventory among all options.

Frequently Asked Questions (FAQ)

Q: Can the AT25320N-10SC be directly replaced with any of these substitute parts?

A: Yes. All three substitute parts maintain the mandatory core parameters: 32Kbit memory size, 4K x 8 organization, SPI interface, 8-SOIC package, and 5ms write cycle time. The substitute parts are pin-compatible and functionally equivalent for applications operating within the original 4.5V to 5.5V supply voltage range and 0°C to 70°C temperature range.

Q: What are the key differences between the substitute parts?

A: The primary differences are clock frequency, operating temperature range, and product certifications. The CAV25320VE-GT3 operates at 10 MHz with automotive qualification and extended temperature range (-40°C to 125°C). Both M95320 variants operate at 20 MHz with standard temperature range (-40°C to 85°C). The M95320-WMN6TP differs from M95320-WMN6P only in packaging format (Cut Tape/Digi-Reel versus Tube).

Q: Are all substitute parts RoHS compliant?

A: Yes. All three substitute parts are ROHS3 compliant, whereas the original AT25320N-10SC is RoHS non-compliant. This compliance improvement may be required for new designs or procurement policies.

Q: Which substitute part should be selected for automotive applications?

A: The CAV25320VE-GT3 is qualified to AEC-Q100 automotive standards and is the appropriate selection for automotive applications requiring automotive-grade reliability.

Q: Can substitute parts operate at lower supply voltages than the original part?

A: Yes. All substitute parts support supply voltages down to 2.5V, compared to the original 4.5V minimum. This extended lower voltage range provides design flexibility for applications with reduced supply voltage requirements.

Q: Are the substitute parts available in the same packaging options as the original?

A: The original AT25320N-10SC is supplied in Tube packaging. The CAV25320VE-GT3 is supplied in Tape & Reel format. The M95320-WMN6P is supplied in Tube format. The M95320-WMN6TP is supplied in Cut Tape and Digi-Reel format. All maintain the identical 8-SOIC physical package.

Q: What is the significance of the higher clock frequencies in the substitute parts?

A: The substitute parts operate at 10 MHz (CAV25320VE-GT3) or 20 MHz (M95320 variants), compared to the original 3 MHz. Higher clock frequencies enable faster data transfer rates while maintaining backward compatibility with applications designed for the original 3 MHz specification.

Q: Is programmability verification important for my application?

A: The M95320-WMN6P and M95320-WMN6TP are verified as programmable by DiGi-Electronics. The CAV25320VE-GT3 programmability status is not verified. If programmability verification is a procurement requirement, the M95320 variants are the appropriate selection.

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