RM25C64DS-LSNI-B Equivalent & Substitute Parts

Part Overview

The RM25C64DS-LSNI-B is a 64Kbit CBRAM (Conductive Bridging RAM) non-volatile memory IC manufactured by Renesas Electronics Corporation. This device operates via SPI interface at 20 MHz and is packaged in an 8-SOIC surface mount configuration. The product is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

RM25C64DS-LSNI-B

Renesas Electronics CorporationIn Stock: 907RM25C64DS-LSNI-B Datasheet

Current PartRFQ

CAT25640VI-G

onsemiIn Stock: 845CAT25640VI-G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RM25C64DS-LSNI-B is determined by the following critical parameters:

Memory Capacity & Interface Compatibility: The substitute must provide 64Kbit storage capacity with SPI serial interface support to maintain firmware and protocol compatibility.

Electrical Specifications: Operating voltage range, clock frequency, and write cycle timing must be compatible with the host system design. The RM25C64DS-LSNI-B operates at 1.65V–3.6V with 20 MHz maximum clock frequency.

Package & Pinout: The 8-SOIC package with 0.154" width (3.90mm) is a standard form factor. Substitute parts must use identical or pin-compatible packaging to ensure PCB-level compatibility without redesign.

Non-Volatile Memory Technology: While the original device uses CBRAM technology, functionally equivalent non-volatile memory technologies (such as EEPROM) that meet the electrical and interface specifications are acceptable substitutes.

Compliance & Certification: RoHS3 compliance and MSL rating (1 – Unlimited) ensure environmental and manufacturing process compatibility.

Parameter Comparison

Engineering Selection Recommendations

The CAT25640VI-G from onsemi is the primary substitute for the obsolete RM25C64DS-LSNI-B. Both devices meet the core substitution criteria:

Electrical Compatibility: The CAT25640VI-G operates within the required 20 MHz SPI clock frequency and provides 64Kbit capacity. The supply voltage range of 1.8V–5.5V encompasses the original device's 1.65V–3.6V specification, ensuring compatibility with existing power supplies.

Package Compatibility: Identical 8-SOIC packaging (0.154", 3.90mm width) with surface mount configuration allows direct PCB-level replacement without layout modifications.

Compliance Status: Both devices are ROHS3 compliant with MSL rating 1 (Unlimited), meeting environmental and manufacturing standards.

Product Availability: The CAT25640VI-G maintains active product status with current inventory availability, providing long-term supply assurance compared to the obsolete RM25C64DS-LSNI-B.

Write Cycle Consideration: The CAT25640VI-G exhibits a page write cycle time of 5ms compared to the original 2.5ms. System firmware must accommodate this timing difference in write operation sequences.

Frequently Asked Questions (FAQ)

Q: Can the CAT25640VI-G directly replace the RM25C64DS-LSNI-B without firmware modification?

A: Yes, for most applications. Both devices use identical SPI protocol and 64Kbit capacity. However, the page write cycle time differs (5ms vs. 2.5ms). Firmware write routines must account for the longer cycle time to ensure data integrity.

Q: Are the pinouts identical between the RM25C64DS-LSNI-B and CAT25640VI-G?

A: Both devices use the 8-SOIC package with identical pin assignments for SPI interface (CS, MOSI, MISO, CLK, VCC, GND). No PCB redesign is required for substitution.

Q: What is the voltage compatibility range for the substitute part?

A: The CAT25640VI-G operates from 1.8V to 5.5V, which is broader than the original 1.65V–3.6V range. Systems designed for the RM25C64DS-LSNI-B will operate within the substitute's specification window.

Q: Does the EEPROM technology of the CAT25640VI-G affect system performance compared to the original CBRAM?

A: Both technologies provide non-volatile storage with SPI interface compatibility. The primary performance difference is the page write cycle time (5ms vs. 2.5ms). Data retention and electrical characteristics are equivalent for typical applications.

Q: Are both devices RoHS compliant?

A: Yes. Both the RM25C64DS-LSNI-B and CAT25640VI-G are ROHS3 compliant with MSL rating 1 (Unlimited), meeting environmental and manufacturing process requirements.

Q: What is the MSL rating and why does it matter?

A: Both devices have MSL rating 1 (Unlimited), indicating no moisture sensitivity limitations. Components can be stored indefinitely without special humidity controls, simplifying inventory and manufacturing processes.