RM25C64C-LSNI-B Equivalent & Substitute Parts

Part Overview

The RM25C64C-LSNI-B is a 64Kbit CBRAM (Conductive Bridging RAM) non-volatile memory IC manufactured by Renesas Electronics Corporation. This device operates at 10 MHz via SPI interface and is housed in an 8-SOIC surface mount package. The product is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new designs requiring similar memory specifications.

Substiute Parts

RM25C64C-LSNI-B

Renesas Electronics CorporationIn Stock: 1284RM25C64C-LSNI-B Datasheet

Current PartRFQ

25AA640A-I/SN

Microchip TechnologyIn Stock: 294725AA640A-I/SN Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RM25C64C-LSNI-B is determined by the following critical parameters:

• Memory Capacity: 64Kbit capacity requirement
• Memory Interface: SPI serial interface compatibility
• Clock Frequency: 10 MHz operation capability
• Package Type: 8-SOIC surface mount form factor
• Non-Volatile Storage: Persistent data retention without power
• Voltage Supply Range: Operating voltage compatibility with system design
• Operating Temperature Range: -40°C to 85°C thermal envelope
• Physical Dimensions: 0.154" width, 3.90mm standard SOIC package

The 25AA640A-I/SN qualifies as a substitute based on matching these core parameters. While the memory technology differs (EEPROM vs. CBRAM), both devices provide equivalent 64Kbit non-volatile storage via SPI interface at 10 MHz in identical 8-SOIC packaging with compatible voltage and temperature specifications.

Parameter Comparison

Engineering Selection Recommendations

The 25AA640A-I/SN is an active product from Microchip Technology with verified programmability status and current inventory availability. The RM25C64C-LSNI-B is classified as obsolete with limited stock. Selection of the 25AA640A-I/SN provides access to an actively manufactured device with equivalent functional specifications and superior voltage supply range (1.8V ~ 5.5V vs. 1.65V ~ 3.6V), offering greater design flexibility for systems operating across extended supply voltage conditions. Both devices maintain ROHS3 compliance and identical thermal operating ranges. The substitute part is suitable for direct replacement in applications where the core 64Kbit SPI memory interface at 10 MHz is the primary functional requirement.

Frequently Asked Questions (FAQ)

Q: Can the 25AA640A-I/SN directly replace the RM25C64C-LSNI-B in existing designs?

A: Yes. Both devices share identical package geometry (8-SOIC), pin configuration, SPI interface protocol, 10 MHz clock frequency, and 64Kbit capacity. No PCB layout modifications are required. The substitute operates within the same thermal range (-40°C to 85°C) and maintains equivalent write cycle timing.

Q: What is the primary difference between these two memory technologies?

A: The RM25C64C-LSNI-B uses CBRAM (Conductive Bridging RAM) technology, while the 25AA640A-I/SN uses EEPROM technology. Both are non-volatile memory formats. From a functional standpoint, they provide equivalent data retention and SPI interface operation at the specified capacity and frequency.

Q: Is the voltage supply range difference significant?

A: The 25AA640A-I/SN supports 1.8V ~ 5.5V, while the RM25C64C-LSNI-B supports 1.65V ~ 3.6V. The substitute offers a wider upper voltage limit, making it compatible with a broader range of system power supplies. Systems designed for the original part will operate correctly with the substitute within the overlapping voltage range (1.8V ~ 3.6V).

Q: Are both parts RoHS compliant?

A: Yes. Both the RM25C64C-LSNI-B and 25AA640A-I/SN are ROHS3 compliant with MSL rating of 1 (Unlimited moisture sensitivity level).

Q: What is the memory organization difference?

A: The RM25C64C-LSNI-B specifies 32 Bytes page size, while the 25AA640A-I/SN specifies 8K x 8 organization. Both devices provide 64Kbit total capacity. The page size difference reflects internal architecture but does not affect SPI protocol compatibility or functional substitution capability.