AT25640N-10SC EEPROM 64Kbit SPI Memory - Equivalent & Substitute Parts

Part Overview

The AT25640N-10SC is a 64Kbit EEPROM memory IC manufactured by Microchip Technology, featuring SPI interface operation at 3 MHz with 8-SOIC surface mount packaging. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts maintain the core 64Kbit capacity and 8K x 8 memory organization while offering enhanced specifications in clock frequency, voltage range, and operating temperature capabilities.

Substiute Parts

AT25640N-10SC

Microchip TechnologyIn Stock: 4310AT25640N-10SC Datasheet

Current PartRFQ

25AA640/S

Microchip TechnologyIn Stock: 74025AA640/S Datasheet

DirectRFQ

BR25H640F-2CE2

Rohm SemiconductorIn Stock: 1471BR25H640F-2CE2 Datasheet

MFR RecommendedRFQ

M95640-RMN6P

STMicroelectronicsIn Stock: 4920M95640-RMN6P Datasheet

MFR RecommendedRFQ

M95640-RMN6TP

STMicroelectronicsIn Stock: 10285M95640-RMN6TP Datasheet

MFR RecommendedRFQ

M95640-WMN6P

STMicroelectronicsIn Stock: 4365M95640-WMN6P Datasheet

MFR RecommendedRFQ

M95640-WMN6TP

STMicroelectronicsIn Stock: 70194M95640-WMN6TP Datasheet

MFR RecommendedRFQ

S-25C640A0I-J8T1U3

ABLIC Inc.In Stock: 946S-25C640A0I-J8T1U3 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following core parameters:

• Memory Size: 64Kbit (mandatory match)
• Memory Organization: 8K x 8 (mandatory match)
• Memory Interface: SPI (mandatory match)
• Package / Case: 8-SOIC or equivalent footprint (mandatory match)
• Voltage Supply Range: Must encompass or exceed 4.5V ~ 5.5V
• Write Cycle Time: 5ms or faster (backward compatible)
• Clock Frequency: 3 MHz or higher (backward compatible)
• Operating Temperature: Must support minimum 0°C ~ 70°C range

Substitute parts are grouped by manufacturer and packaging configuration. All listed substitutes meet the mandatory electrical and mechanical compatibility criteria. Enhanced specifications such as higher clock frequency, wider voltage range, extended temperature range, and improved RoHS compliance are provided as additional benefits without affecting functional substitutability.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed are active products with ROHS3 compliance, addressing the obsolescence and RoHS non-compliance status of the AT25640N-10SC.

STMicroelectronics M95640 Series (M95640-RMN6P, M95640-RMN6TP, M95640-WMN6P, M95640-WMN6TP): These parts provide the highest clock frequency (20 MHz) and widest availability. M95640-WMN6TP offers the largest inventory (70,090 pcs) with verified programmability. M95640-RMN6TP and M95640-WMN6TP are available in Cut Tape & Digi-Reel packaging. M95640-WMN6P and M95640-RMN6P are supplied in Tube packaging. All M95640 variants maintain the 8-SOIC (0.154", 3.90mm) footprint matching the original part.

Rohm Semiconductor BR25H640F-2CE2: This part features automotive-grade qualification (AEC-Q100) with 10 MHz clock frequency and 4ms write cycle time. Package footprint is 8-SOIC (0.173", 4.40mm), which differs slightly from the original. Extended operating temperature range (-40°C ~ 125°C) supports automotive applications.

ABLIC Inc. S-25C640A0I-J8T1U3: This part offers 5 MHz clock frequency with the widest voltage supply range (1.6V ~ 5.5V) and verified programmability. Maintains the 8-SOIC (0.154", 3.90mm) footprint.

Microchip Technology 25AA640/S: This die-form part operates at 1 MHz with the widest voltage range (1.8V ~ 5.5V). Die packaging is not suitable for direct PCB mounting and requires specialized handling.

Frequently Asked Questions (FAQ)

Q: Can M95640-WMN6TP directly replace AT25640N-10SC on the PCB?

A: Yes. The M95640-WMN6TP maintains the same 8-SOIC (0.154", 3.90mm) footprint, SPI interface, 64Kbit capacity, and 8K x 8 organization. The higher clock frequency (20 MHz vs. 3 MHz) and extended voltage range (2.5V ~ 5.5V) are backward compatible with designs specified for the original part.

Q: Why does BR25H640F-2CE2 have a different package width (0.173" vs. 0.154")?

A: BR25H640F-2CE2 uses an 8-SOP package variant with slightly wider dimensions. While both are 8-pin SOIC-class packages, PCB footprint verification is required before substitution. The core electrical specifications remain compatible.

Q: Is 25AA640/S a suitable substitute?

A: 25AA640/S is electrically compatible but supplied as a bare die rather than a packaged IC. This form factor requires specialized assembly and is not suitable for direct PCB replacement in standard surface mount applications.

Q: What is the advantage of M95640-WMN6TP over other M95640 variants?

A: M95640-WMN6TP offers the highest inventory availability (70,090 pcs) with verified programmability and Cut Tape & Digi-Reel packaging for automated assembly. It maintains identical electrical specifications to other M95640 variants.

Q: Does the higher clock frequency of substitute parts affect circuit design?

A: No. Higher clock frequency is a backward-compatible enhancement. Designs specified for 3 MHz operation function correctly with 5 MHz, 10 MHz, or 20 MHz parts. The SPI interface protocol remains unchanged.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant, addressing the RoHS non-compliance status of the obsolete AT25640N-10SC.

Q: Which substitute part has the widest operating temperature range?

A: BR25H640F-2CE2 supports -40°C ~ 125°C, the widest range among all substitutes. Other active parts support -40°C ~ 85°C. The original AT25640N-10SC operates only at 0°C ~ 70°C.