LC5256MB-75F256C Equivalent & Substitute Parts

Part Overview

The LC5256MB-75F256C is a Complex Programmable Logic Device (CPLD) from Lattice Semiconductor Corporation's ispXPLD® 5000MB series. This device features 256 macrocells, 141 I/O pins, and a maximum propagation delay of 7.5 ns, designed for embedded applications requiring in-system programmability. The product is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and ongoing system support.

Substiute Parts

LC5256MB-75F256C

Lattice Semiconductor CorporationIn Stock: 971LC5256MB-75F256C Datasheet

Current PartRFQ

LCMXO2-1200UHC-4FTG256I

Lattice Semiconductor CorporationIn Stock: 5960LCMXO2-1200UHC-4FTG256I Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The LCMXO2-1200UHC-4FTG256I qualifies as a substitute based on the following alignment criteria:

Package Compatibility: Both devices utilize a 256-pin BGA package in 17x17 form factor, ensuring mechanical and electrical socket compatibility on printed circuit boards.

Programmability: Both devices support in-system programmability, maintaining design flexibility and field reconfiguration capability.

Surface Mount Technology: Both employ surface mount assembly methods, compatible with standard manufacturing processes.

Logic Density & I/O Capacity: The substitute provides 206 I/O pins and 1280 logic elements, exceeding the original device's 141 I/O and 256 macrocell specifications, ensuring functional coverage for existing designs.

Voltage Supply Range: The substitute operates at 2.375V ~ 3.465V, which encompasses the original device's 2.3V ~ 2.7V range, supporting voltage compatibility.

Moisture Sensitivity: Both devices share MSL 3 classification, maintaining equivalent handling and storage requirements.

Parameter Comparison

Engineering Selection Recommendations

The LCMXO2-1200UHC-4FTG256I is the designated substitute for the obsolete LC5256MB-75F256C. Selection of this alternative is justified by the following factors:

Product Status: The substitute is classified as active, ensuring continued availability, technical support, and manufacturing continuity. The original device's obsolete status creates supply chain risk and limits access to updated documentation.

Regulatory Compliance: The substitute achieves ROHS3 compliance, meeting current environmental and regulatory requirements. The original device's RoHS non-compliant status presents compliance challenges for new system deployments.

Enhanced Specifications: The substitute provides superior operating temperature range (-40°C ~ 100°C versus 0°C ~ 90°C), expanded I/O capacity (206 versus 141 pins), and increased logic density (1280 elements versus 256 macrocells), enabling broader application scope without design limitations.

Package Compatibility: Identical 256-pin BGA package footprint (17x17) ensures direct board-level compatibility with minimal or no PCB redesign.

Programmability Preservation: Both devices maintain in-system programmability, preserving design flexibility and field reconfiguration capabilities.

Frequently Asked Questions (FAQ)

Q: Can the LCMXO2-1200UHC-4FTG256I directly replace the LC5256MB-75F256C on existing PCBs?

A: Yes. Both devices use identical 256-pin BGA packages in 17x17 form factor. The substitute's increased I/O count (206 versus 141) and logic capacity (1280 versus 256 macrocells) provide functional superset coverage. PCB footprints are compatible without modification.

Q: What are the key differences between these devices?

A: The LC5256MB-75F256C is a CPLD with 256 macrocells and 141 I/O pins. The LCMXO2-1200UHC-4FTG256I is an FPGA with 1280 logic elements and 206 I/O pins. The substitute offers greater logic density and I/O capacity, operates across a wider temperature range (-40°C ~ 100°C), and maintains active product status with ROHS3 compliance.

Q: Are there voltage supply compatibility concerns?

A: The substitute's supply voltage range (2.375V ~ 3.465V) encompasses the original device's range (2.3V ~ 2.7V). Existing power supply designs require verification to confirm operation within the substitute's specified range, but no fundamental incompatibility exists.

Q: Does the substitute support in-system programmability like the original?

A: Yes. Both devices are in-system programmable, maintaining equivalent field reconfiguration and design flexibility capabilities.

Q: What is the impact of the substitute's wider operating temperature range?

A: The substitute operates from -40°C ~ 100°C compared to the original's 0°C ~ 90°C range. This expanded range provides greater flexibility for applications requiring extended temperature operation, with no negative impact on designs operating within the original temperature window.

Q: Are moisture sensitivity requirements identical?

A: Yes. Both devices are classified as MSL 3 (168 Hours), requiring identical handling, storage, and reflow procedures.

Q: Why is the substitute's active product status significant?

A: Active status ensures ongoing manufacturing, technical support, and documentation availability. The original device's obsolete classification creates supply chain uncertainty and limits access to updated resources, making the active substitute the preferred long-term solution.