LC4256V-75FT256AI Equivalent & Substitute Parts

Part Overview

The LC4256V-75FT256AI is a Complex Programmable Logic Device (CPLD) from Lattice Semiconductor's ispMACH® 4000V series, designed for embedded applications requiring in-system programmability. This device features 256 macrocells, 128 I/O pins, and a maximum propagation delay of 7.5 nanoseconds, operating within a 3V to 3.6V supply range.

The LC4256V-75FT256AI carries an obsolete product status. Identifying equivalent substitute parts is essential for system redesign, inventory management, and ensuring continued availability for production and maintenance applications.

Substiute Parts

LC4256V-75FT256AI

Lattice Semiconductor CorporationIn Stock: 1599LC4256V-75FT256AI Datasheet

Current PartRFQ

LC4256V-75FTN256AC

Lattice SemiconductorIn Stock: 743LC4256V-75FTN256AC Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LC4256V-75FT256AI is determined by the following critical parameters:

• Macrocell Count: 256 macrocells (functional logic capacity)
• I/O Pin Count: 128 I/O pins (interface capability)
• Propagation Delay: 7.5 ns maximum (timing performance)
• Supply Voltage Range: 3V to 3.6V (power compatibility)
• Package Type: 256-FTBGA (17x17) (physical and electrical footprint)
• Programmable Type: In System Programmable (design methodology compatibility)

The LC4256V-75FTN256AC meets all these critical parameters, making it a valid functional equivalent. Differences in operating temperature range and product status do not affect electrical or mechanical substitutability for applications within the specified thermal envelope.

Parameter Comparison

Engineering Selection Recommendations

The LC4256V-75FTN256AC is the manufacturer-recommended substitute for the obsolete LC4256V-75FT256AI. Both devices are electrically and mechanically identical across all functional parameters: macrocell count, I/O configuration, timing performance, supply voltage, package type, and programmable architecture.

The LC4256V-75FTN256AC offers the advantage of active product status, ensuring continued availability and manufacturing support. Additionally, this substitute achieves ROHS3 compliance, meeting modern environmental and regulatory requirements that the original part does not satisfy.

The operating temperature range of the LC4256V-75FTN256AC (0°C ~ 90°C) is narrower than the original part (-40°C ~ 105°C). Applications requiring operation below 0°C or above 90°C must retain the LC4256V-75FT256AI or identify alternative solutions outside this product family.

Frequently Asked Questions (FAQ)

Q: Are the LC4256V-75FT256AI and LC4256V-75FTN256AC pin-compatible?

A: Yes. Both devices use the 256-FTBGA (17x17) package with identical pinout, electrical characteristics, and mechanical footprint. Direct substitution on existing PCB layouts is possible.

Q: What is the difference between the two part numbers?

A: The primary differences are product status (obsolete vs. active), operating temperature range (-40°C to 105°C vs. 0°C to 90°C), and RoHS compliance status (non-compliant vs. ROHS3 compliant). All functional and electrical parameters are identical.

Q: Can I use the LC4256V-75FTN256AC in applications requiring -40°C operation?

A: No. The LC4256V-75FTN256AC is specified for 0°C minimum operating temperature. Applications requiring -40°C operation must use the LC4256V-75FT256AI or identify alternative CPLD solutions with extended temperature ratings.

Q: Is the LC4256V-75FTN256AC suitable for new designs?

A: Yes. The active product status, ROHS3 compliance, and identical functional specifications make this device appropriate for new embedded CPLD applications within the 0°C to 90°C operating range.

Q: What does MSL 3 (168 Hours) mean for handling?

A: Moisture Sensitivity Level 3 requires storage in controlled humidity environments and limits the time between package opening and soldering to 168 hours under specified conditions. Both devices share this requirement.