FM93CS56LN EEPROM 2Kbit Microwire Equivalent & Substitute Parts

Part Overview

The FM93CS56LN is a 2Kbit EEPROM memory IC with Microwire interface manufactured by onsemi. This device operates at 1 MHz clock frequency with a 10ms write cycle time and supports supply voltages from 2.7V to 5.5V. The part is classified as obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations.

Substiute Parts

FM93CS56LN

onsemiIn Stock: 2115FM93CS56LN Datasheet

Current PartRFQ

93LC56B/P

Microchip TechnologyIn Stock: 195993LC56B/P Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution compatibility for the FM93CS56LN is determined by the following critical parameters:

Memory Specifications: The substitute part must maintain identical memory capacity (2Kbit), organization (128 x 16), and interface protocol (Microwire). These parameters ensure functional equivalence at the system level.

Electrical Characteristics: Supply voltage range and operating temperature must be compatible with the application circuit. The substitute part's voltage range must encompass or exceed the original specification to ensure operation across all intended conditions.

Package and Mounting: Physical compatibility requires identical or pin-compatible package type (8-DIP) and mounting method (Through Hole) to ensure direct PCB integration without redesign.

Interface Timing: Clock frequency and write cycle time determine system performance. Substitute parts with equal or faster specifications maintain or improve system performance without requiring firmware or timing adjustments.

The 93LC56B/P from Microchip Technology qualifies as a direct substitute based on these criteria.

Parameter Comparison

Engineering Selection Recommendations

The 93LC56B/P is a direct functional substitute for the FM93CS56LN. Both devices share identical memory capacity, organization, interface protocol, package type, and operating temperature range. The Microchip part offers performance improvements with 2 MHz clock frequency and 6ms write cycle time compared to the onsemi part's 1 MHz and 10ms specifications.

The 93LC56B/P maintains compatibility with the original supply voltage range and provides superior electrical characteristics. The substitute part is currently in active production status, ensuring long-term availability and supply chain stability compared to the obsolete FM93CS56LN.

The 93LC56B/P achieves ROHS3 compliance, addressing regulatory requirements for new designs and manufacturing environments where RoHS compliance is mandated.

Frequently Asked Questions (FAQ)

Q: Can the 93LC56B/P directly replace the FM93CS56LN without PCB modifications?

A: Yes. Both parts use identical 8-DIP through-hole packaging with the same pin configuration and Microwire interface protocol. Direct pin-for-pin substitution is possible without PCB redesign.

Q: What are the performance differences between these parts?

A: The 93LC56B/P operates at 2 MHz clock frequency with 6ms write cycle time, compared to the FM93CS56LN's 1 MHz and 10ms specifications. These improvements enhance system performance without affecting compatibility.

Q: Are there voltage supply compatibility concerns?

A: The 93LC56B/P operates across 2.5V to 5.5V, while the FM93CS56LN requires 2.7V to 5.5V. For applications using supply voltages between 2.5V and 2.7V, the substitute part provides extended operating range. For all other applications within the original specification, both parts are fully compatible.

Q: Does the substitute part require firmware or software modifications?

A: No. The Microwire interface protocol and memory organization remain identical. The faster clock frequency and write cycle time of the substitute part are transparent to the application and require no firmware changes.

Q: What is the significance of RoHS compliance differences?

A: The FM93CS56LN is RoHS non-compliant, while the 93LC56B/P is ROHS3 compliant. For new designs or manufacturing environments subject to RoHS regulations, the 93LC56B/P is the appropriate selection.

Q: Is the 93LC56B/P available in the same packaging options?

A: The substitute part is supplied in 8-PDIP packaging, which is mechanically and electrically equivalent to the 8-DIP package of the original part. Both packages support through-hole mounting with identical pin spacing and configuration.