RM24C128DS-LSNI-B Equivalent & Substitute Parts

Part Overview

The RM24C128DS-LSNI-B is a 128Kbit CBRAM non-volatile memory IC manufactured by Renesas Electronics Corporation, featuring I2C interface operation at 1 MHz. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations. The part is housed in an 8-SOIC surface mount package with a supply voltage range of 1.65V to 3.6V and operates across the industrial temperature range of -40°C to 85°C.

Substiute Parts

RM24C128DS-LSNI-B

Renesas Electronics CorporationIn Stock: 887RM24C128DS-LSNI-B Datasheet

Current PartRFQ

24CW1280T-I/SN

Microchip TechnologyIn Stock: 936424CW1280T-I/SN Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RM24C128DS-LSNI-B is determined by the following critical parameters:

• Memory Size: 128Kbit capacity requirement
• Memory Interface: I2C protocol compatibility
• Clock Frequency: 1 MHz operation
• Package / Case: 8-SOIC form factor
• Voltage - Supply: Operating voltage range compatibility
• Operating Temperature: -40°C to 85°C range
• Mounting Type: Surface mount configuration
• Non-Volatile Memory Type: Persistent data storage requirement

The substitute part 24CW1280T-I/SN meets all critical electrical and mechanical parameters. While the memory format differs (EEPROM versus CBRAM), both technologies provide non-volatile storage with identical capacity, interface protocol, clock frequency, package configuration, and temperature operating range. The voltage supply range of the substitute (1.6V ~ 5.5V) encompasses the original part's range (1.65V ~ 3.6V), ensuring compatibility in existing circuit designs.

Parameter Comparison

Engineering Selection Recommendations

The 24CW1280T-I/SN qualifies as a direct substitute based on matching electrical specifications and identical package configuration. The substitute part carries active product status from Microchip Technology, ensuring long-term availability and supply chain continuity compared to the obsolete RM24C128DS-LSNI-B. Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for industrial and commercial applications.

The expanded voltage supply range (1.6V ~ 5.5V) of the substitute provides additional design flexibility while remaining fully compatible with circuits designed for the original part's 1.65V to 3.6V specification. Identical I2C interface protocol, 1 MHz clock frequency, and 8-SOIC package ensure direct functional replacement without circuit modification.

Frequently Asked Questions (FAQ)

Q: Can the 24CW1280T-I/SN replace the RM24C128DS-LSNI-B in existing designs?

A: Yes. Both parts share identical memory capacity (128Kbit), I2C interface protocol, 1 MHz clock frequency, 8-SOIC package configuration, and -40°C to 85°C operating temperature range. The substitute's voltage range encompasses the original part's specification, ensuring compatibility.

Q: What is the difference between CBRAM and EEPROM memory formats?

A: Both are non-volatile memory technologies. CBRAM (Conductive Bridging RAM) and EEPROM (Electrically Erasable Programmable Read-Only Memory) differ in internal architecture and operation principles, but both provide persistent data storage with identical electrical interface characteristics for this application.

Q: Are there package compatibility concerns?

A: No. Both parts use the 8-SOIC (0.154", 3.90mm Width) surface mount package. Pin configuration and footprint are identical, allowing direct PCB replacement without layout modification.

Q: Does the substitute part meet compliance requirements?

A: Yes. The 24CW1280T-I/SN is ROHS3 compliant and REACH unaffected, matching the regulatory status of the original part.

Q: What is the advantage of selecting the substitute part?

A: The 24CW1280T-I/SN carries active product status from Microchip Technology, ensuring availability and supply chain support. The original RM24C128DS-LSNI-B is obsolete, making the substitute the recommended choice for new designs and ongoing system support.