AT25320W-10SC EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The AT25320W-10SC is a 32Kbit Serial Peripheral Interface (SPI) EEPROM memory IC manufactured by Microchip Technology, housed in an 8-SOIC surface mount package. This device operates at 3 MHz clock frequency with a supply voltage range of 4.5V to 5.5V and is rated for industrial temperature range (0°C to 70°C). The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain functional compatibility through matching memory capacity, interface protocol, package form factor, and electrical operating parameters.

Substiute Parts

AT25320W-10SC

Microchip TechnologyIn Stock: 890AT25320W-10SC Datasheet

Current PartRFQ

25C320/SN

Microchip TechnologyIn Stock: 211325C320/SN Datasheet

MFR RecommendedRFQ

CAV25320VE-GT3

onsemiIn Stock: 1550CAV25320VE-GT3 Datasheet

MFR RecommendedRFQ

M95320-WMN6TP

STMicroelectronicsIn Stock: 31732M95320-WMN6TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT25320W-10SC 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 / Case: 8-SOIC (mandatory match)
• Mounting Type: Surface Mount (mandatory match)

Operational Compatibility Criteria:

• Clock Frequency: Must be equal to or greater than 3 MHz
• Write Cycle Time: Must be equal to or less than 5ms
• Voltage Supply Range: Must encompass or be compatible with 4.5V ~ 5.5V
• Operating Temperature: Must support minimum 0°C ~ 70°C range

Substitute parts are grouped based on active product status and compliance certifications. Parts with higher clock frequencies, wider voltage ranges, or extended temperature ratings provide enhanced operational margins and are suitable for direct replacement in the AT25320W-10SC application.

Parameter Comparison

Engineering Selection Recommendations

25C320/SN (Microchip Technology): Direct functional equivalent with identical electrical specifications (3 MHz clock, 4.5V ~ 5.5V supply, 0°C ~ 70°C operating range). Active product status with ROHS3 compliance. Recommended as primary replacement for direct pin-compatible substitution with no design modifications required.

CAV25320VE-GT3 (onsemi): Enhanced specification variant with 10 MHz clock frequency, extended voltage range (2.5V ~ 5.5V), and automotive-grade qualification (AEC-Q100). Operating temperature range extends to -40°C ~ 125°C. Suitable for applications requiring higher clock speeds or automotive-grade reliability. ROHS3 compliant.

M95320-WMN6TP (STMicroelectronics): High-performance variant with 20 MHz clock frequency and extended voltage range (2.5V ~ 5.5V). Operating temperature range -40°C ~ 85°C. Highest clock frequency option among substitutes, providing maximum operational margin. ROHS3 compliant. Recommended for applications requiring enhanced speed performance or wider supply voltage tolerance.

All three substitute parts maintain identical memory capacity, organization, SPI interface, package form factor, and write cycle time. Selection should be based on required clock frequency, temperature range, voltage supply requirements, and compliance certifications for the target application.

Frequently Asked Questions (FAQ)

Q: Can 25C320/SN directly replace AT25320W-10SC without PCB modifications?

A: Yes. The 25C320/SN is a direct functional equivalent with identical pin configuration, package dimensions (8-SOIC), and electrical specifications. No PCB layout changes are required.

Q: What is the primary advantage of CAV25320VE-GT3 over the main part?

A: The CAV25320VE-GT3 offers three key advantages: higher clock frequency (10 MHz vs. 3 MHz), extended voltage supply range (2.5V ~ 5.5V vs. 4.5V ~ 5.5V), and automotive-grade qualification (AEC-Q100). Operating temperature range extends to -40°C ~ 125°C, supporting wider environmental conditions.

Q: Is M95320-WMN6TP compatible with existing firmware or software?

A: Yes. The M95320-WMN6TP maintains SPI interface protocol compatibility and identical memory organization (4K x 8). The higher clock frequency (20 MHz) is backward compatible with lower-speed SPI bus implementations. No firmware modifications are necessary.

Q: Why is the AT25320W-10SC classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. Active substitute parts (25C320/SN, CAV25320VE-GT3, M95320-WMN6TP) are available from current inventory to support ongoing applications and new designs.

Q: Are all substitute parts RoHS compliant?

A: Yes. All three substitute parts are ROHS3 compliant. The original AT25320W-10SC is RoHS non-compliant, making substitution necessary for applications requiring RoHS compliance.

Q: Can substitute parts with higher clock frequencies be used in applications designed for 3 MHz operation?

A: Yes. Higher clock frequency parts are backward compatible. The SPI interface operates at the speed determined by the host controller. Parts rated for 10 MHz or 20 MHz will function correctly in 3 MHz SPI bus implementations.

Q: What is the significance of the extended temperature range in CAV25320VE-GT3 and M95320-WMN6TP?

A: Extended temperature ranges (-40°C ~ 125°C and -40°C ~ 85°C respectively) support industrial, automotive, and harsh environment applications. The original part is limited to 0°C ~ 70°C, restricting use in extreme temperature conditions.

Q: Are there any voltage supply considerations when substituting parts?

A: The original AT25320W-10SC requires 4.5V ~ 5.5V supply. Substitute parts CAV25320VE-GT3 and M95320-WMN6TP support wider ranges (2.5V ~ 5.5V), allowing operation at lower supply voltages. Existing 5V designs remain fully compatible.