NM93CS56M Equivalent & Substitute Parts

Part Overview

The NM93CS56M is a 2Kbit EEPROM memory IC manufactured by onsemi, featuring Microwire serial interface operation at 1 MHz. This device is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing system support and new design implementations. The part operates within a 4.5V to 5.5V supply range and is housed in a 14-SOIC package suitable for surface mount applications.

Substiute Parts

NM93CS56M

onsemiIn Stock: 731NM93CS56M Datasheet

Current PartRFQ

93LC56B/SN

Microchip TechnologyIn Stock: 228093LC56B/SN Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the NM93CS56M is determined by the following critical parameters:

• Memory capacity (2Kbit) and organization (128 x 16 bits)
• Serial interface protocol (Microwire)
• Non-volatile EEPROM technology
• Operating voltage compatibility
• Operating temperature range (0°C ~ 70°C minimum)

The 93LC56B/SN from Microchip Technology qualifies as a functional equivalent based on matching memory size, organization, interface protocol, and temperature range. While package and frequency specifications differ, the core memory functionality and electrical interface remain compatible for Microwire-based applications.

Parameter Comparison

Engineering Selection Recommendations

The 93LC56B/SN is suitable as a substitute for the obsolete NM93CS56M in applications requiring 2Kbit Microwire EEPROM functionality. The substitute part offers several advantages: active product status ensures ongoing availability, ROHS3 compliance meets current environmental standards, and extended voltage range (2.5V ~ 5.5V) provides greater design flexibility compared to the original 4.5V ~ 5.5V specification.

The 93LC56B/SN operates at 2 MHz clock frequency and 6ms write cycle time, both superior to the original part's 1 MHz and 10ms specifications. These performance improvements are backward-compatible with designs originally specified for the NM93CS56M.

Package transition from 14-SOIC to 8-SOIC requires PCB layout modification. The reduced pin count reflects the same functional interface, as the 8-SOIC package consolidates the Microwire protocol pins without functional loss.

Frequently Asked Questions (FAQ)

Q: Can the 93LC56B/SN directly replace the NM93CS56M without firmware changes?

A: Yes. Both devices implement identical Microwire serial interface protocol with matching memory organization (128 x 16 bits). The higher clock frequency and faster write cycle time of the substitute are backward-compatible with original firmware.

Q: What is the primary reason for substitution?

A: The NM93CS56M is classified as obsolete. The 93LC56B/SN provides equivalent functionality with active product status and current RoHS compliance.

Q: Does the package change from 14-SOIC to 8-SOIC affect electrical compatibility?

A: Package change requires PCB layout redesign but does not affect electrical interface compatibility. Both packages support identical Microwire protocol signaling.

Q: Is the extended voltage range of the 93LC56B/SN (2.5V ~ 5.5V) a concern?

A: No. The extended lower voltage limit provides additional design flexibility. Systems operating at 4.5V ~ 5.5V remain fully compatible.

Q: What certifications differ between the two parts?

A: The 93LC56B/SN is ROHS3 compliant, while the NM93CS56M is RoHS non-compliant. Both share identical REACH and ECCN classifications.